988G
®
Wheel Loader
Bucket capacities
6.3 to 7.0 m3
8.2 to 9.2 yd3
50 090 kg
110,428 lb
Gross power
388 kW
520 hp
Flywheel power
354 kW
475 hp
Operating weight Cat® 3456 EUI Engine
988G Wheel Loader Improved Improved performance and and rugged durability durability combine combine with operator operator comfort for maximum productivity. Structures and Fabricated Box Boom
Power Train
Operator Station and Controls
The articulated frame design features Designed for durability, the Caterpillar Experience a new level of efficiency a high-torsion, compact, load-absorbing, planetary power shift transmission and and comfort with one-hand operation front frame and a large, box-section, provided by the STIC controller and ✔ impeller clutch torque converter provide smooth, consistent shifting with ✔ a 38 percent larger cab. Operator ✔ engine-end frame. New fabricated boom, and redesigned linkage geometry ✔ finger tip control. Electronic controls productivity is also increased with lowincrease dump clearance, provide effort, finger tip implement controls, contribute to increased levels of improved breakout and lift forces, and improved range of viewing, reduced productivity. pg. 6-7 increase the viewing area to the bucket sound levels, improved ventilation and corners. pg. 4-5 easier entry and exit. ®
pg. 10-11 Engine
Hydraulics and Electronic Monitoring
Innovative electro-hydraulics electro-hydraulics play a key ✔ The turbocharged and aftercooled 3456 Electronic Unit Injection Diesel Engine role in performance of the 988G and delivers 10 percent more power and provide low operator effort. Increased 24 percent improvement in torque rise. ✔ hydraulic efficiency improves lift and tilt cycle time for reduced reduced overall overall cycle Changes to the aftercooler, injectors, bearings, and pistons help to improve time. The tradition of reliable, highstartability, response, power, emissions, performance Caterpillar hydraulics pg. 8-9 8-9 and fuel consumption. continues. pg.
pg. 6
Revolutionary design, Caterpillar quality quality.. Electro-hydraulic Electro-hydraulic controls, controls, increased power and torque rise, an all-new front linkage, and unmatched operator comfort work together for increased performance and added durability to make the 988G an innovative, 21st Century large wheel loader geared for maximum production in the toughest conditions.
2
Buckets and Ground Engaging Tools
Bucket and Application Truck Match
Maintenance and Serviceability
✔ Choose between 6.3 m3 (8.2 yd 3) and 7.0 m3 (9.2 yd 3) capacity capacity buckets, buckets, spade edge and straight edge buckets , with various Ground Engaging Tools to match job conditions. Replaceable wear plates on the bucket heel protect the bottom of the buckets. Built by Caterpillar, these buckets retain the proven shell-tine construction design for unmatched durability.
Increased performance and good pass matching make the 988G a versatile performer. Proper bucket and payload matching promote increased stability and performance. pg. 13, 14
Most daily maintenance checks can be performed from the left side of the machine facilitating quick start up. Easy access to major maintenance points (oil levels and fills, grouped grease fittings, sight gauges, and S•O•S SM or pressure ports) make daily checks routine. Improved access to major components through large, lockable service doors enhance serviceability and increase uptime. pg. 16
pg. 12
✔ New New
feature feature
3
Structures and Fabricated Box Boom Superior design of structures, along with bold, new box-section front linkage linkage provide provide superior strength. strength. Structures on the 988G combine the use of robotic welding and castings in critical high-stress areas. More than 90 percent of the 988G structure structure is robotically welded to provide highly consistent welds and increased strength. Castings are also used in several areas to increase strength by helping to spread the loads and reduce the number of parts.
1 Full box-section frame has been redesigned for maximum strength and minimum weight. The frame rail is now extended further forward, improving rail to hitch strength.
2 Box-shaped tower is designed for improved resistance to twisting for maximum strength. The tilt cylinder tower’s high-strength steel plates direct stress down to the lift cylinder cast mounting tube, absorbing impact and loading forces. This design results in a narrower tower which gives better operator visibility.
3 Upper and lower hitch-pins pivot on double-tapered roller bearings. The hitch plates are shaped to direct stress away from the end of the weld, resulting in a smoother transition of stress loads into the frame.
2
4 Spread-hitch design increased the spread 26 percent to help square-up the frame and provide increased clearance for access to the hitch and hydraulic lines.
1
3
5 Steering Steering cylinder cylinder mounts are located on the axle pads providing efficient transfer of steering loads to the axle.
4
3
4
5
6 Fabricated box boom replaces the traditional steel plate lift arms found on wheel loaders. This design features forked ends for easier service, faster assembly, and increased reliability. Castings in high stress areas smooth the transition of stress distribution for excellent service life. The new boom and dual bucket links work together for increased breakout force, better torsional resistance and higher lift capacity.
Box-section design of the fabricated boom has more torsional strength than the previous Z-bar design. (With the parallel lift arm design, corner loading the bucket sends stresses up the lift arm, through the cross tube welding and up the other lift arm.) The box-section design spreads stresses over the full length and perimeter of the boom, allowing stress transfer through parent material. This resists twisting and prevents stress paths that can lead to cracking.
6
6 Weld Joint
Load Path Load Path (Full Length)
5
Power Train Cat power train delivers top performance performance and durability in tough tough applications. 1 The Cat 3456 EUI Diesel Engine is based on on one of the the most successful engines offered by Caterpillar, the 3406E. The 3456 features increased horsepower and efficient fuel management for quick response, high productivity and exceptional service life.
The 42 percent torque rise provides high lugging force during digging and acceleration in high rimpull conditions. The torque curve effectively matches the transmission shift points to provide maximum efficiency and faster cycle times.
4 3
Electronic Unit Injection (EUI) is a proven proven high-pre high-pressure ssure,, direct direct injection fuel system that electronically monitors operator demands and sensor inputs to optimize engine performance.
1
2
6
6
Advanced Diesel Engine Management II (ADEMII) system controls the fuel injector solenoids to monitor fuel injection. This system provides automatic altitude compensation, air filter restriction indication, and will not allow the engine to fire until it has oil pressure, acting as a cold start protection and a form of pre-lube.
2 Separate engine cooling system isolates the radiator and fan from the engine compartment for more efficient cooling and allows for a sloped hood for increased viewing.
Advanced Modular Cooling System (AMOCS) improves cooling capabilities by using a parallel flow flow system with with seven cores. Serviceability is improved with AMOCS as there is no top tank to remove.
6
3 Electronically controlled Caterpillar planetary, power shift transmission features perimeter-mounted, large diameter clutch packs that control inertia for smooth shifting and increased component life.
2
Rimpull Control System (RCS) allows the operator to select from four preset maximum rimpull settings, other than 100 percent, that are available in first gear (90, 85, 75, and 65 percent). A lock-up clutch torque converter for direct drive efficiency is also available as an optional attachment.
5 Heavy-duty Axles feature optional axle oil coolers, coolers, permanently permanently lubed universal joints and stronger axle components in both the differentials and final drives for increased performance, serviceability and durability.
Free-floating axle shafts can be removed independent of the wheels and planetaries for quick and easy serviceability.
5
Optional Axle oil cooling system features two circuits that circulate oil from the differentials through an oil-to-air cooler and a filter and back to the brakes. This system provides increased oil life and improves component performance and durability. The system automatically turns on and off at a preset oil temperature.
6 Axle-shaft, oil disk brakes are 4
4 Impeller Clutch Torque Converter (ICTC) combined with the Rimpull
Maximum Rimpull Selected
Control System (RCS) allows the operator maximum flexibility in modulating rimpull.
20% Rimpull Selected
) l
s l u e p
k m a i
r
R
B % 0
2
(
The impeller clutch torque convertor uses the left brake pedal to modulate rimpull from 100 to 20 percent for reduced tire slippage. After 20 percent is achieved, further pedal travel applies the brake.
adjustment free, fully hydraulic and completely sealed. Disc face grooves provide cooling, even when brakes are applied, for a long, fade-resistant service life.
Left Brake Pedal
Location of the brakes improves serviceability. The axle-shaft brake design allows brake service while leaving the final drive intact. Axle-shaft brakes require less force by operating on the low torque side of the axle. Combined with improved axle oil circulation for increased cooling, the oilenclosed, multiple-disc brake design improves durability. Parking brake is spring-applied, oil-released, and dry disc.
7
Hydraulics and Electronic Controls Efficient, Efficient, well-balanced hydraulics hydraulics and low-effort low-effort electronic electronic controls controls mean high performance performance and exceptional durability. 1 Revolutionary electro-hydraulic control system increases hydraulic efficiency and enhances operator comfort through low-effort finger tip controls. Caterpillar’s XT-3 and XT-5 hose and reliable components help reduce the risk of leaks and blown lines, helping protect the environment.
3
2 Lift and tilt system consists of larger bore lift and tilt cylinders and a two position main hydraulic pump contributing to increased performance and serviceability.
5 4 2
The two position main hydraulic pump is controlled by the Electronic Control Module (ECM). A solenoid valve controls the pump displacement, allowing the ECM to adjust hydraulic flow during the loader cycle. This strategy results in faster hydraulics and greater lift forces leading to optimized performance.
3
3 Load Sensing Steering with STIC control system integrates steering and transmission into a single controller. The steering system utilizes a variable displacement pump for maximum machine performance by directing power through the steering system only when needed.
4 Case Drain Filtration is an optional attachment included throughout the hydraulic system to protect against contamination and provide easy access for service. A total of three filters protect the main hydraulic, steering, and fan pumps.
5 The demand fan is a speed controlled, hydraulic fan that provides maximum cooling efficiency by directing the appropriate amount of power through the fan system based on ambient conditions.
8
1
Advanced electronics play a major role in the operation of the 988G. Productivity improvements, enhanced serviceability, increased operator efficiency and lower costs are direct benefits of the 988G advanced electronics. Available attachments include:
6 2
Electronic Monitoring System II (EMS II) continually monitors various machine systems through three instrument clusters and provides a three-level warning system to alert the operator of immediate or pending problems. EMS II shares information with the engine, hydraulic, and transmission controls that can be used during servicing to simplify service and troubleshooting.
2
Optional Payload Control System tracks data regarding the load in the bucket. It also features a numeric keypad and easy-to-view display. An available printer makes onboard ticket printing possible.
Optional Ride Control attachment provides a boom suspension system by placing accumulator in the boom circuit, reducing fore and aft pitch over terrain. This results in a smoother, more comfortable ride allowing higher load and carry speeds, increased load retention, and component life.
Loose material mode provides maximum hydraulic speed and efficiency for loading in easily penetrated loose material.
6
9
Operator Station A new industry standard standard for for comfort and efficiency efficiency.. A world class cab with over 3.18 m 3 (112 (112 ft3) of volume incorporates innovations for operator comfort, maneuverability and productivity. Features include outstanding viewing, improved cab ventilation, interior sound levels levels below below 77 dB(A), dB(A), standard standard coat coat hook, cup holder, storage bin, intermittent wet-arm wipers, room for a large lunch cooler, and is radio-ready.
15 15
1 STIC control system combines gear selection and steering into one control lever that requires less effort and provides smooth shifting. Sideto-side motions for steering, finger operated direction control, and thumb operated buttons for gear selection combine to provide a fluid motion that reduces effort and allows the operator to work the machine for long periods of time with little or no fatigue.
2 The left pedal operates impeller clutch torque converter.
3 Cat Comfort Seat replaces the previous Contour Series Seat. More foam in key parts of the seat back, thicker seat cushions, automotive style lumbar support, and an all-new, ergonomic design translate into greater operator comfort, less fatigue, and consistent productivity throughout the shift. The seat is a six-way adjustable air suspension seat with a retractable seat belt, headrest, and adjustable armrests for optimal comfort and high productivity.
4 Floor mounted Electro-hydraulic Controls and arm rests provide low effort, finger tip control for enhanced comfort and stability.
10
Controls and arm rests are fore, aft, and height adjustable to accommodate operators of any size in a comfortable operating position.
1
2
3
13
8
9
Upper Left Console 14
10
12
14
11
15
Upper Right Console 5 Electr Electroni onic c Moni Monitor toring ing Sys System tem II (EMSII) display system provides information on the machine’s major components and system.
5
7 6 16 4
Gauge displays fuel tank level and temperatures for engine coolant, power train and hydraulic oil. Tachometer is an analog gauge with digital readout for gear selection and ground speed. Main module consists of ten fault indicators and one display panel.
6 Throttle Lo Lock allows operator to preset the engine speed for a variety of applications, resulting in faster cycle times and increased productivity.
7 Rimp Rimpul ulll Cont Contro roll Syst System em (RC (RCS) S) Switch turns RCS on and off. 8 Rimp Rimpul ulll Cont Contro roll Syst System em (RC (RCS) S) has four factory preset reduced rimpull settings (90, 85, 75 and 65 percent of rimpull). Reduced rimpull settings can be modified by dealer to operator preference or to better match ground conditions.
9 Kick Kickou outt Posi Positi tion oner er Con Contr trol ol is one of 12
the many in-cab electronic features designed to enhance productivity. This control allows the operator to set customized upper, lower, and bucket dig angle kickouts for maximum operating efficiency.
10 Optional Optional Ride Control Control Switch Switch turns Ride Control to off or automatic position.
11 Autosh Autoshift ift featur feature e allows the operator to set the maximum gear into which the transmission will be allowed to shift. This feature allows additional comfort and focus on the job. The switch also offers a manual position for operator controlled shifting.
12 Optional Optional lock-u lock-up p clutch clutch torque torque converter switch activates lock-up clutch for direct drive efficiency.
13 Loose material material operating operating mode tailors hydraulics to provide maximum loose material loading efficiency.
14 Front Front and and rear rear wind window ow wiper/washers are within easy reach to maintain a clear field of vision.
15 Improv Improved ed viewin viewing g area area with bonded front windshield eliminates distracting metal frames for excellent bucket and work site visibility. An internal ROPS improves peripheral viewing by eliminating the large structure outside the cab.
16 Electro-hy Electro-hydraul draulic ic lock-out lock-out switch switch disables hydraulic controls.
11
Buckets Caterpillar buckets and Ground Engaging Tools provide the flexibility to match the machine to your application. The 988G has several buckets available ranging from 6.3 m 3 (8.2 yd3) to 7.0 m3 (9.2 yd3) sizes that may be configured for a variety of impact and abrasive conditions. All buckets are built with shell-tine construction (1) that resists twisting and distortion and feature replaceable, weld-on wear plates to protect the bottom of the bucket. Integral rock guard (2) helps retain big loads while heavy-duty pins and retainers (3) provide durability.
2
1
Spade-edge Rock Buckets with bolt-on segments are available in 6.4 m 3 (8.33 yd3), 6.6 m3 (8.7 yd3), 6.9 m3 (9.0 yd3). Each accepts up to two sets of sidebar protectors (4), features shouldered, double-strap adapters, easily changed bolt-on segments and several tip options.
4
Spade-edge Rock
3
Straight-edge Buckets are available in 6.3 m3 (8.2 yd3) Straight-edge Rock and 7.0 m3 (9.2 yd3) General Purpose configurations. The 6.3 m3 (8.2 yd3) Straight-edge Rock features shouldered, double strap adapters and accepts two sets of sidebar protectors, bolt-on segments and tips. The 7.0 m 3 (9.2 yd3) General Purpose Bucket is available with bolt-on cutting edge, bolt-on adapters, or bolt-on adapters with segments.
Heavy-duty Quarry Bucket is availa available ble as a 6.4 m3 (8.33 yd3) capacity bucket and is recommended for use in face loading where moderate abrasion and high impact is encountered. This bucket features additional wear protection items, including: thicker base edge and adapters (5), additional liners and wear plates (6), bolt-on half arrow segments (7), and four sidebar protectors.
General Purpose
High Abrasion Bucket is available available as a 6.4 m3 (8.33 yd3) capacity bucket and is recommended for use in face loading where high abrasion and moderate impact is encountered. This bucket features additional wear protection items including: independently attached edge and adapter covers, additional liners and wear plates, one set of sidebar protectors, and a thicker base edge.
6
7 Heavy-duty Quarry
12
5
Bucket Match Proper bucket and application match delivers increased stability and peak performance. The 988G offers a variety of bucket types and available Ground Engaging Tool configurations to properly configure the machine based on material density, impact and abrasion. Depending on your material densities, the 988G has available a 6.4 m 3 (8.33 yd3) Spade Nose bucket with teeth and bolt-on segments for for improved performance and edge protection. Increased full turn static tip load, horsepower and hydraulic capabilities allow the 988G to effectively utilize the 6.6 m3 (8.7 yd3) and 6.9 m3 (9.0 yd3) bucket size in lighter materials such as limestone. All buckets on the 988G feature the well proven shell-tine construction.
Standard Bucket Selection Guide and Matrix Standard 3
yd
6.9
9.0
6.6
8.7
6.4
8.33
m
3
110% e z i S t e k c u B
100%
110%
90%
100%
110%
2200 1 30 0
2 4 00
2600 1 5 00
2 8 00
90%
100%
3 0 00
1 700
90%
3200
3400 lb/LCY
1900
2000 kg/LCM
Material Density NOTE: Percentages shown represent bucket fill factor - Center point at 100% fill
13
Application Truck Match Matched payloads payloads and matched matched buckets buckets ensure ensure optimum performance. performance. The 988G is an aggressive first gear loader for face and bank excavation. With increased dump clearance, the 988G can easily load 40 to 70 ton offhighway trucks. Increased performance and good pass match make the 988G a versatile performer with a cost per ton that will help your bottom line. We also designed the versatility of a material handler handler into the the machine. With balanced rimpull and hydraulics, the 988G is an aggressive loader that gets the job done quickly and efficiently in loose or stock-pile material and in load and carry work.
Large Wheel Loader/Truck Loader/Truck Application Match
) h " c a 1 1 e ' R 6 ( & e m c 0 n 1 . a r 2 a & e ) l C " p 1 ' 3 m u 1 ( D m G 8 9 9 8 . 9 3
5 pass
4 pass
3 pass
35 35
40 40
45
45
50
50
55
55 60
60 65
Truck Payload 769D = 41.3 Short Ton (37.4 Metric Tons) maximum payload 771D = 44.8 Short Ton Ton (40.6 Metric Tons) Tons) maximum payload payload 773D = 58.4 Short Ton (53.0 Metric Tons) maximum payload 775D = 69.9 Short Ton (63.4 Metric Tons) maximum payload
14
Metric Tons 70 Short Tons
Complete Customer Support Cat Dealer services help you operate longer with lower costs. Your Cat Dealer offers a wide range of services that can be set up under a customer support agreement agreement when you purchase your equipment. The dealer will help you choose a plan that can cover everything from machine and attachment selection to replacement, to help you get the best return on your investment.
Selection. Make detailed comparisons of the machines you are considering before you buy. How long do components last? What is the cost of preventive maintenance? What is the true cost of lost production? Your Cat Dealer can give you precise answers to these questions.
Operation. Improving operating techniques can boost your profits. Your Cat Dealer has training videotapes, literature and other ideas to help you increase productivity.
Maintenance. More and more equipment buyers are planning for effective maintenance before buying equipment. Choose from your dealer’s wide range of maintenance services at the time you purchase your machine. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling and Technical Analysis help you avoid unscheduled repairs.
Product support. You will find nearly
Replacement. Repair, rebuild or
all parts at our dealer parts counter. Cat dealers utilize a world-wide computer network to find in-stock parts to minimize machine down time. Save money with remanufactured parts. You receive the same warranty and reliability as new products at cost savings of 40 to 70 percent.
replace? Your Cat Dealer can help you evaluate the cost involved so you can make the right choice.
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Maintenance and Serviceability Easier maintenance and enhanced serviceability serviceability give you more more time in the pile. pile. Easier maintenance and repair through monitoring key functions and logging critical indicators. Electronic diagnostic access is possible with a single tool, the Electronic Technician. In addition to the servicing features built into the engine, the 988G includes:
Most daily maintenance checks can be performed from the left side of the machine, making it part of an easy pre-start routine. Routine maintenance promotes long service life and durability.
The Advanced Modular Cooling System allows service technicians to replace individual cores for enhanced serviceability. Maintenance is also simplified since AMOCS is isolated from the engine compartment.
U-joints are lifetime lubricated, leaving the slip joint as the only drive line component needing grease.
Lube points are centralized in accessible locations. Fuel fill is located on the left side. Both lube points and fuel fill are accessible from ground level, making lube and fuel service quicker and easier.
Swing-out doors on both sides of the engine compartment provide easy access to the engine oil dipstick and filler spout, S•O•S SM port, fuel filters, air conditioner compressor, engine oil filters, alternator, starting receptacle, air filter service indicator, coolant fill, and ether starting aid. Disconnect switch and diagnostic connector are located on rear platform.
16
Hinged doors in platform provide access to the hydraulic tank fill, implement and steering filters. Transmission sight glass and filler spout are serviced from the hitch area.
Batteries sit in a built-in battery box and are accessible through tread plates on the right platform.
Shock resistant lights are replaceable by hand, not requiring the use of any tools.
Cab support bracket provided with every machine improves access under the cab. The bracket is conveniently stored behind the cab.
Electronic Monitoring System II (EMSII) provides operators and service technicians with diagnostic information on the machine’s major components and systems.
Diagnostic connector enables quick evaluation of eleven starting and charging functions.
Engine Four-stroke cycle, six cylinder 3456 EUI turbocharged and aftercooled diesel engine.
Ratings at 1900 rpm*
kW
hp
Gross power
388
520
Net power
354
475
The following ratings apply at 1900 rpm when tested under the specific standard conditions for the specified standard: Gross Power
kW
hp
388
520
kW
hp
354
475
354
475
Bore
140 mm
5.5 in
Stroke
172 mm
6.8 in
15.8 liters
964 in 3
ISO 3046-2 Net Power ISO 9249 EEC 80/1269
Features
*Power rating conditions
based on standard air conditions of 25°C (77°F) and 99 kPa (29.32 in Hg) dry barometer used 35° API gravity fuel having an LHV of 42 780 kJ/kg (18,390 Btu/lb) when used at 30°C (86°F) [ref. a fuel density of 838.9 g/L (7.001 lb/gal)] net power advertised is the power available when the engine is equipped with alternator, air cleaner, muffler and hydraulic fan drive no derating required up to 2286 m (7,500 ft) altitude
high pressure electronic directinjection fuel system full electronic control Advanced Diesel Engine Management II (ADEMII) dry-type radial seal air cleaners with primary and secondary elements and precleaner direct-electric, direct-electric, 24-volt starting system with 100-amp alternator and four high performance, maintenance free batteries providing 750 cold cranking amps
Dimensions
Displacement
2800
2066
2600
1919
) 2400 m • N 2200 ( e 2000 u q r o 1800 T 1600 e n i g 1400 n E 1200
1771 1624 1476 1328 1181 1033 886
1000
738
400
536
) W k 350 B ( r 300 e w o 250 P e 200 n i g n E 150
469 402 335 268 201
100
134
290
.476
) r h - 270 W k / 250 m g 230 ( C F S B 210
.443 .411 .377 .344
190
) b l • t f ( e u q r o T e n i g n E
) p h B ( r e w o P e n i g n E
) r h p h B / b l ( C F S B
.312 1000 1000
1200 1200
1400
1600 1600
1800 1800
2000 2000
Engine rpm Gross Net
988G Wheel Wheel Loader Loader specifications
17
Transmission
Brakes
Final Drives
17" planetary power shift transmission with four speeds forward and three reverse.
Meets SAE J1473 OCT90 and ISO 3450: 1992.
All wheel drive.
Features Parking brake features
Maximum travel speeds (35/65-33 tires) km/h
mph
Forward 1
6.9
4.3
2
12.3
7.6
3
21.8
13.5
4
38.7
24.0
1
7.1
4.4
2
12.6
7.8
3
22.3
13.8
Reverse
Features
Electronic Shift Control diagnostics accessible through Electronic Monitoring System II auto shift speed and direction finger tip controls housed in STIC controller Impeller Clutch Torque Converter is standard with additional optional lock-up attachment which provides faster travel speeds and improves fuel efficiency Rimpull Control System
spring-applied, oil-released, dry disc brake mounted on transmission transfer gear output shaft for manual operation electronic monitoring system alerts operator if transmission is engaged while parking brake is applied electronic monitoring system alerts operator if pressure drops and automatically applies the parking parking brake brake
planetary reduction at each wheel torque developed at the wheel, less stress on the axle shafts planetary units can be removed independently from the wheels and brakes
Axles Fixed front, oscillating rear (±13°).
Secondary brake features
fully modulated front and rear service brake circuits are isolated, allowing one circuit to operate if pressure drops in the other circuit
Features
Service brake features
four wheel, hydraulic, oil cooled, multiple-disc brakes completely enclosed modulated engagement without slack adjusters/adjustment adjusters/adjustment free two brake pedals allow standard braking with right pedal and impeller clutch/braking with left pedal
maximum single-wheel rise and fall: 559 mm (22 in.) conventional differential is standard free-floating axle shafts can be removed independently from wheels and planetary final drives optional axle oil cooling is available on front and rear
Loader Hydraulic System System is completely sealed. Innovative low-effort controls.
Main hydraulic system with one pump (two position variable displacement)
Hydraulic cycle time (standard)
Output at 2010 rpm and 6900 kPa (1001 psi) with SAE 10W oil at 66°C (150°F)
Raise
9. 4
Dump
2. 4
Lower, empty, float down
3. 8
492 lpm
130.0 gpm
31 000 kPa
4,500 psi
Cylinders, double acting: lift, bore and stroke
220 x 911 mm
8.7 x 35.9"
Cylinder, double acting: tilt, bore and stroke
220 x 1770 mm
8.7 x 69.7"
76 lpm
20.1 gpm
2400 kPa
348.1 psi
Relief valve setting
Total
Pilot system, gear-type pump Output at 2010 rpm and 2500 kPa (363 psi) Relief valve setting (low idle)
18
988G Wheel Wheel Loader Loader specifications
15.6 seconds
Cab
Bucket Controls
Caterpillar cab with integrated Rollover Protective Structure (ROPS) are standard.
Electro-hydraulic Electro-hydraulic lift and tilt circuits. Lift circuit features
Features the operator sound exposure Leq (equivalent sound pressure level) measured according to the work cycle procedures specified in ANSI/SAE J1166 OCT98 is 77 dB(A), for the cab offered by Caterpillar, when properly installed and maintained and tested with the doors and windows closed the exterior sound pressure level for the standard machine measured at a distance of 15 meters according to the test procedures specified in SAE J88 JUN 86, mid-gear-mov mid-gear-moving ing operation, is 82 dB(A) standard air conditioning system contains the environmentally safe R134a refrigerant ROPS meets the following criteria: - SAE J104 J1040 0 APR APR 88 - ISO 3471 3471:: 199 1994 Also meets the following criteria for Falling Objects Protective Structure: - SAE J23 J231 JAN81 AN81 - ISO ISO 344 3449: 9: 1992 1992 Leve Levell II II spectator sound is 116 dB(A) as measured per ISO6396 spectator sound is 113 dB(A) when equipped with optional sound suppression package as measured per ISO6396
Service Refill Capacities
Gallons
679
179.4
Cooling system
95
25.1
Crankcase
60
15.9
Transmission
70
18.5
Fuel tank–standard
four positions: raise, hold, lower and float can adjust automatic upper and lower kickouts from cab
Tilt circuit features
L
three positions: tilt back, hold, and dump can adjust automatic bucket positioner to desired loading angle from cab does not require visual spotting
Differentials and final drives front
146
38.6
rear
146
38.6
(factory fill)
470
124.2
(tank only)
267
70.5
Hydraulic system
Controls
two-lever implement control electro-hydraulic electro-hydraulic bucket controls for lower lever efforts
Steering Full hydraulic load-sensing steering system meets SAE J1511 FEB94 and ISO 5010: 1992 specified standards.
Features
STIC operated pilot valve controls flow to steering cylinders center-point frame articulation front and rear wheels track hydraulic power with load-sensing system floor mounted controls and adjustable arm rests for a full range of adjustment total steering angle of 86º and onehand operation
988G Wheel Wheel Loader Loader specifications
19
Operation/Bucket Specifications Straight Rock
Spade Rock
Teeth & Segments
Teeth & Segments
Teeth & Segments
Teeth & Segments
Gen. Purpose
H.D. Quarry
High Abrasion
Teeth & Segments
Teeth & Segments
Teeth & Segments
Rated capacity (§)
m3 yd3
6.3 8.2
6.4 8.33
6.6 8.7
6.9 9.0
7.0 9.2
6.4 8.33
6.4 8.33
Struck capacity (§)
m3 yd3
5.2 6.7
5.3 6.9
5.5 7.2
5.7 7.5
5.9 7.7
5.3 6.9
5.3 6.9
mm in
3800 150"
3800 150"
3900 154"
3980 157"
3729 147"
3800 149"
3926 155"
mm in
4199 13' 9"
3994 13' 1"
3994 13' 1"
3994 13' 1"
— —
3930 12' 11"
3905 12' 10"
mm in
4460 14' 8"
4276 14' 0"
4278 14' 0"
4278 14' 0"
4333 14' 3"
4285 14' 1"
4275 14' 0"
mm in
1895 6' 3"
2096 6' 11"
2099 6' 11"
2099 6' 11"
— —
2127 7' 0"
2187 7' 2"
mm in
1669 5' 6"
1613 5' 3"
1655 5' 5"
1648 5' 5"
1838 6' 0"
1616 5' 4"
1612 5' 3"
mm in
4199 13' 9"
4485 14' 9"
4488 14' 9"
4488 14' 9"
— —
4553 14' 11"
4613 15' 2"
mm in
3854 12' 8"
3746 12' 4"
3804 12' 6"
3795 12' 5"
4064 13' 4"
3750 12' 4"
3746 12' 4"
mm in
129.2 5.1"
99.7 3.9"
98.1 3.9"
99.6 3.9"
99.6 3.9"
99.7 3.9"
101.9 4.0"
With teeth*:
mm in
12 238 40' 2"
12 505 41' 0"
12 508 41' 0"
12 508 41' 0"
— —
12 572 41' 3"
12 634 41' 5"
Bare:
mm in
11 893 39' 0"
12 163 39' 11"
12 160 39' 11"
12 160 39' 11"
12 083 39' 8"
12 151 39' 10"
12 165 39' 11"
mm in
8164 26' 9"
8164 26' 9"
8164 26' 9"
8164 26' 9"
7943 26' 1"
8164 26' 9"
8164 26' 9"
17 588 57' 8"
17 500 57' 5"
17 656 57' 11"
17 722 58' 2"
— —
17 602 57' 9"
17 544 57' 7"
mm in
17 482 57' 4"
17 394 57' 1"
17 550 57' 7"
17 616 57' 9"
17 408 57' 1"
17 496 57' 5"
17 438 57' 2"
Static tipping load straight †
kg lb
32 725 72,146
32 282 71,169
32 278 71,160
32 280 71,164
32 626 71,927
30 824 67,955
30 793 67,086
Static tipping load at full 35° tu turn
kg lb
29 136 64,223
28 705 63,283
28 699 63,270
28 700 63,273
29 079 64,108
27 246 60,067
27 215 59,998
Static tipping load at full 40° tu turn
kg lb
28 081 61,907
27 654 60,966
27 647 60,951
27 648 60,953
28 037 61,810
26 195 57,750
26 165 57,683
Static tipping load at full 43° turn (§)
kg lb
27 391 60,386
26 968 59,464
26 959 59,434
26 961 59,438
27 354 60,305
25 509 56,237
25 478 56,169
Breakout force †† (§)
kN lb
548 123,300
460 103,500
460 103,500
460 103,500
484 108,900
455 102,375
451 101,475
Operating weight † (§)
kg lb
49 846 109,890
50 090 110,428
50 120 110,495
50 127 110,510
49 560 109,260
51 352 113,211
51 400 113,316
Width (§) Dump clearance at full lift and With teeth*: 45° discharg discharge. e. Bare
(§):
Reach at full lift and 45° With teeth*: discharge. Bare
(§):
Reach with boom – horizontal and bucket level. With teeth*: Bare
(§):
Digging depth (§) Overall length
Overall height with bucket at full raise (§)
Loader clearance circle with bucket in With teeth*: carry position. mm in Bare
(§):
(§) Specifications and ratings conform to all applicable standards recommended by the Society of Automotive Engineers. SAE Standards J732C govern loader ratings and are denoted in the text by (§). * Dimensions are also measured to the tip of the bucket teeth to provide accurate clearance data. data. SAE Standards specifies specifies the cutting edge. † Static tipping tipping load and operating operating weight shown shown are based on standard machine machine configuration configuration with 35/65-33, 35/65-33, 30-ply L-4 tires, full fuel tank, coolant, lubricants and operator. †† Measured 102 mm (4.0"): behind behind tip of cutting edge edge with bucket hinge hinge pin as pivot point in accordance accordance with SAE J732C. J732C.
20
988G Wheel Wheel Loader Loader specifications
Dimensions All dimensions are approximate.
65°
5886 mm (19' 4") 5560 mm (18' 3")
4155 mm (13' 8") 4146 mm (13' 7")
55.5°
3416 mm (11' 2") 3185 mm (10' 5")
787 mm (31")
583 mm (23") 3132 mm (10' 3")
45.7°
1012 mm (3' 3")
2275 mm (7' 6") 4550 mm (14' 11")
Dimensions vary with bucket. Refer to operation specifications chart on page 20.
Tire Dimensions/Specifications
Change in vertical dimensions
Ground clearance
Width over tires mm
inches
mm
inches
mm
inches
35/65-33, 30-ply L-4 Firestone (Standard)
3543
139.5
583
23.0
0
0
35/65-33, 30-ply L-5 Firestone
3523
138.7
542
21.3
-41
-1.6
35/65-33, 42-ply L-5 Bridgestone
3543
139.5
583
23.0
0
0
35/65-33, 30-ply L-4 General
3473
136.7
498
19.6
-85
-3.3
35/65-33, 30-ply L-5 General
3515
138.4
498
19.6
-85
-3.3
35/65-33, 42-ply L-5 General
3515
138.4
498
19.6
-85
-3.3
35/65-33, 30-ply L-4 Goodyear
3527
138.9
545
21.5
-38
-1.5
35/65-33, RL4K L-4 Goodyear
3574
140.7
508
20.8
-75
-3.0
35/65-33, 30-ply L-5 Goodyear
3537
139.3
550
21.7
– 33
– 1.3
35/65-33, 42-ply L-5 Goodyear
3537
139.3
550
21.7
-33
-1.3
35/65 R33, 1-Star L-4 Michelin
3554
139.9
514
20.2
– 69
– 2.7
35/65 R33, 1-Star L-5 Michelin
3538
139.3
520
20.5
– 63
– 2.5
NOTE: In certain applications (such as load-and-carry work) the loader’s productive capabilities might exceed the tires tonnes-km/f (t on-mph) capabilities. Caterpillar recommends that you consult a tire supplier to evaluate all conditions before selecting a tire model. Other special tires are available on request.
988G Wheel Wheel Loader Loader specifications
21
Supplemental Specifications Change in Operating Weight Standard (for four tires)
Tires:
kg
35/65-33, 30-ply L-4 Firestone (Standard)
lb
Change in Full turn Static Tipping Load kg
lb
0
0
0
0
+494
+1,088
+286
+631
+1183
+2,608
+686
+1,512
35/65-33, 30-ply L-4 General
-504
-1,112
-292
-644
35/65-33, 30-ply L-5 General
+102
+224
+59
+130
35/65-33, 42-ply L-5 General
+553
+1,152
+321
+708
35/65-33, 30-ply L-4 Goodyear
-205
-452
-119
-263
35/65-33, RL4K L-4 Goodyear
-1047
-2,308
-608
-1,340
35/65-33, 30-ply L-5 Goodyear
+272
+600
+158
+348
35/65-33, 42-ply L-5 Goodyear
+659
+1,452
+383
+844
35/65 R33, 1-Star L-4 Michelin
-987
-2,176
-573
-1,263
35/65 R33, 1-Star L-5 Michelin
-339
-748
-197
-435
35/65-33, 30-ply L-5 Firestone 35/65-33, 42-ply L-5 Bridgestone
22
988G Wheel Wheel Loader Loader specifications
Standard Equipment Standard equipment may vary. Consult your C aterpillar Dealer for specifics.
Electrical Alarm, back-up Alternator (100-amp) Batteries, maintenance-free Deutsch terminal connectors Diagnostic connector Starting and charging system Electrical Converter, 12-volt Electrical System, 24-volt Lighting system, Halogen (Front and Rear) Starter, electric (heavy-duty) Starter receptacle for emergency start
Operator Environment Air Conditioner Cab, sound-suppressed pressurized Internal four-post rollover protective structure (ROPS) Cigar lighter and ashtray Coat hook Cup, Lunchbox, and Thermos Holders Electro-hydraulic Electro-hydraulic Tilt and Lift controls Electro-hydraulic Electro-hydraulic lock-out switch Heater and defroster Horn, electric Lights, interior cab Loose Material Mode Monitoring system (EMSII) Action alert system, three-category Instrumentation; Instrumentation; Gauges: Engine coolant temperature Fuel level Hydraulic oil temperature Torque converter temperature
Instrumentation; Warning Indicators: Axle oil temperature (front/rear) Brake oil pressure Coolant flow status Electrical system, low voltage Engine oil pressure Engine overspeed Hydraulic filter status Parking brake status Steering oil pressure Transmission filter status Mirrors, rearview (exterior mounted) Radio ready cab for entertainment or two-way radio. Antenna, speakers and converter included. Seat (cloth), Cat comfort Seat belt, retractable, 76 mm (3") STIC Control System with steering lock Tilt and Lift Control System Lock Tinted glass Transmission gear indicator Wet-arm wiper/washers (front and rear) Intermittent front wiper
Power Train Brakes, full hydraulic, enclosed, wet Demand fan Engine, Cat 3456 EUI Direct Injected Diesel Extended life coolant, premixed 50% concentration with freeze protection to -34°C (-29°F) Fuel priming aid Parking brake
Precleaner, engine air intake Radiator, Advanced Modular Cooling System (AMOCS) Separated Cooling System Throttle lock Torque Converter, Impeller Clutch with Rimpull Control System Transmission, planetary, auto shift with 4F/3R speed range control
Other Standard Equipment Automatic bucket tilt/lift kickouts, electronically adjustable from cab Cab tilt support Counterweight Ground level fuel fill Hitch, drawbar with pin Hydraulic oil cooler Locking engine enclosures Lower cab cover Muffler (under hood) Oil sampling valves Rear access stairway (standard, left side) Vandalism protection caplocks Venturi stack Walkway
Tires An allowance for tires is included in the base machine price. Tire selections are shown in the Tire/Supplemental Tire/Supplemental Specifications list on page 22.
Optional Equipment Optional equipment may vary. Consult your Caterpillar Dealer for specifics. Auxiliary lights Axle oil-coolers Block handler configuration (Custom) Case drain filtration Directional lights Engine Jake Brake Forestry configuration (Custom) Fuel, fast fill Fuel heater
Guards Crankcase Steering cylinders Heater, engine coolant, 120-volt Heater, engine coolant, 240-volt High Ambient Radiator Lock-up clutch No-SPIN differential, rear only Oil change, high-speed
PCS (Payload Control System) Precleaner, Turbine non-metal Rear intermittent wiper Ride control Right-hand stairway Roading fenders, front and rear Roof, extended Secondary steering Sound suppression, exterior Steel Mill configuration (Custom)
988G Wheel Wheel Loader Loader specifications
23
988G Wheel Loader
www.CAT.com © 2000 Caterpillar Printed in U.S.A. Featured machines may include additional equipment only for special applications.
AEHQ5388 (08-00) (Replaces AEHQ5048-02)
See your authorized Caterpillar Dealer for available options. Materials and specifications are subject to change without notice.
®
