2 The steering pump is mounted to the upper left, rear of the flywheel housing. Components identified in the two illustrations are:
PRESSURE
2. Right steer pump control solenoid 3. Steering charge pump
PL I OT CONTROLLED
ROTATING SHAFTS
TEMPERATURE
FLOW
UN I DI R E CT O I NA L
BD I R I EC TI ON AL
V EN TE D
RETURN ABOVE FLUID LEVEL
P RE SS UR Z I ED
RETURN BELOW FLUID LEVEL
COMBINATIONCONTROLS
"HC". left steering loop pressure test port. "HD". right steering loop pressure test port.
The float pilot boost line (8) directs pilot oil from the LOWER/FLOAT end of the dozer lift control valve to the last (external) resolver in the signal resolver network. Pilot oil is used to signal the implement pump to upstroke when the FLOAT function is requested by the operator.
"X2". pressure test port (steer left)
H P RR
D9T Track-Type Tractor Hydraulic System
1. Left steer pump control solenoid
Each implement control valve also contains a pilot pressure test port (7) for testing pilot pressure at the end of the valve. The other end of each implement control valve also contains a corresponding pressure test port (not visible above).
H P TL
S HU TT LE
SPRING LOADED
FLUID STORAGE RESERVOIRS
The case drain lines from the steering pump, the steering motor, the implement pump, the fan pump, the dual tilt and quick drop valve all come together in the case drain manifold (5). The case drain oil is then returned to the case drain filter, which is contained in the hydraulic tank. Each implement control valve contains a solenoid controlled pilot valve (6) at either end of the control valve. (The solenoid controlled pilot valves located at the bottom of each control valve are not visible in the illustration above.)
HPDL
BASIC SYMBOL
INFI I NFI N ITE I TEPO SI TIO N
MEASUREMENT
At the left side of the valve stack is the i nlet manifold (1). Th e inlet manifold contains the chargin g valve (2) and the main relief valve (3). Implement signal pressure (HB) can be tested at the pressure test port (4) that is installed on the pump signal line, below the inlet manifold.
1. Hydraulic demand fan pump 2. Fan pump pressure sensor 3. Fan pump pressure control solenoid 4. Adjustment screw for the pump control spool 5. Adjustment screw for the pressure control spool "HFPD". Hydraulic Fan Pump Discharge pressure test port
4
FAN PUMP
Opening the grill on the front of the radiator guard gains access to the fan (4) and the hydraulic fan motor (5). If the machine is equipped with dual tilt, the dual tilt valve (6) is also located here. middle of the radiator guard.
4
Schematic Location
Electrical Symbols Table
TapLocations Pressure,Sampling,andSensor
A5 -
Tap Number
Description
21 4- 10 94
S TE ER N I GM OT OR
B -7
AP
ACCUMULATOR PRESSURE
21 2- 22 97
C HA RG EF L I TE R
C 7-
HA
I MP P - UM P- DI SC HA RG E
D 3-
2 12 - 06 75
C O LD O L I R E LI E FV A LV E
A-6
HB
I MP-P UMP S - I GNA L
C-4
214-1097
FAN PUMP
B-4
HC
L EF TS TE ER L OO PP RE SS UR E
B -6
6
21 4- 10 98
I MP LE ME NT P UM P
B -3
HD
R I GH T S T EE RL OO PP R ES S UR E
B-6
7
214- 1099
F AN MOT OR
B- 5
F
C HA RG EP UMP P RE SS UR E
C 6-
8
1 24 8 - 33 5
C OO LE RB YP AS S
A5 -
S
OI LSA M P LI NG P ORT
C-7
H FP D
206-7353
COOLER
A-4
20 8- 15 58
S UC TI ON M AN F I OL D
B -3
223-8531
F AN P UM PD S I CH AR GE
HPS
P ILOT SUPPLY
E-6
X1
STEERPUMP CONTROLPRESSURE(R)
B-5
A CC UM UL AT OR S
D4 -
X2
STEERPUMP CONTROLPRESSURE(L)
B-5
2 0 1- 0 95 0
S H UT - OF F V A LV E P - I LO T
E-4
H PS O
H Y DP I LO T R P I P ER T I P- OU T
D -7
C-5
H PR R
H YD P L I OT R P I PE RR AI SE
D6 -
H PR L
H YD P L I OT R P I PE RL OW ER
D6 -
214-1079
IMPLEMENT VALVE (BULLDOZER/RIPPER)
211-7817
IMPLEMENT VALVE (BULLDOZER/WINCH)
H PS I
208- 9683
E ND COV ER
D-7
16
2 17 -4 32 7
Q UI CK D RO PV AL VE
E -5
17
165-8633 225-6727
LIFT CYLINDER
E-5
LIFT CYLINDER
18
109-6778
SINGLE TILTCYLINDER(RH)
19
1 3 3- 8 26 9
C A S ED RA I NM A NI F OL D
B-1
20
1 23 - 80 98
R I P PE RL I FT C Y LI N DE R
E - 7, F - 7 E - 7, F - 7
21
1 23 - 80 97
R I PP E RT I PC Y LI N DE R
22
6 E -3 1 13
P I N P U LL E RC Y LI N DE R
23
1 88 -6 14 0
E -8
222-0491
TANK GP
B-2
1 54 -6 16 5
V AC UU MB RE AK ER
C2 -
26
1 26 1 - 81 3
PL I OT F L I TE R
D 4-
27
4E-1437 1 437 N/ A 21 7- 43 26
H YD P L I OT R P I PE RT P I -I N
D7 -
H PT L
H YD P L I OT T L I TL EF T
D 6-
H PT R
H YD P L I OT T L I TR G I HT
D 6-
H PD L
H YD P L I OT D OE RL OW ER
D5 -
H PD R
H YD P L I OT D OZ ER R AI SE
D5 -
22
21
23
19
6C
24
25
1
5C
F
X1
X2
3
2C
AP
HC HD
S 16
8
Pressure Switch (Adjustable)
Pressure Switch
9
Electric Motor
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
17
T
E-8
PN I P UL LE RV AL VE
24
1A
Generator
E-6
25
28
Transducer (Gas / Air)
B4 -
E-4
2 00 -0 75 0
13
15
M
G Transducer (Fluid)
E-4
PRESSUREREDUCINGVALVE
12
14
Hydraulic Symbols (Electrical)
Schematic Location
5
9
The hydraulic demand fan pump is mounted to the rear of the implement pump at the upper right of of the flywheel housing. The fan drive pump is a variable displacement axial piston pump.The pump provides the oil flow that is needed to operate the hydraulic fan motor. Service points for the demand fan pump that are shown above are:
Description
4
11
PIN PULLER / CYLINDER
ST EE RI NG P UM P
3
10
Pin
Printed in U.S.A.
STEERING PUMP
7
CHECK VALVE (FANCIRCUIT)
B-4
P IL ILOT MAN FI OLD DUALTILTOPTION
D- 13
D UA LT IL TV AL VE
F -6
D9T
2A
1 09 - 88 32
D U AL T I LT C Y LI N DE R ( RH )
E-6
1 09 - 88 33
D U AL T I LT C Y LI N DE R ( LH ) REVERSING FAN OPTION
F-6
1B
214-1100
REVERSING FANMOTOR OPTI ( O N) ON)
B-5
2B
229-1466
VALVE GP
C-5
Pressure Symbol
Temperature Symbol
1A 27
3A
1B
Flow Symbol
Level Symbol
Wire Number Identification Codes Electri Ele ctrical c al Schema ematic tic Example
Hydrau Hyd raulic Schematic Exa Exampl mple CurrentStandard
CurrentStandard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
N/A: Part number unavalible at the time of publication.
WireColor
325-AG135 PK-14 325-PK CircuitIdentification Number
WireColor
WireGauge
Previous Standard ComponentLocations
5 6
Item
Part Number
1C
183-4584 4 584
SPEED SENSOR (STEERING MOTOR)
B-8
2C
164-7577 7 577
CHARGE FILTER BYPASSSWITCH
C-6
3C
Description
20
Schematic Location
237-0957
FANPUMPPRESTRANSDUCER
B-4
4C
237-0957
IMPLEMENT PUMP PRESSTRANSDUCER
D-3
5C
2 2 4 -4 5 35
6C
1 4 5- 7 02 8
C H AR G EP RE SS T R AN S DU C ER
C-7
TEM P ER A TU R ES EN SO R
C-2
HB
15
14
11
12
13
HPSO HPSI HPRR HPRL
26 28 4C
HPTL HPTR HPDL HPDR
HPS H A
AP
1C
6
5
2
10
3C
2B
4
2A 3A
18
Wire Color
Wire
325-PK-14 B
HFPD
Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
MACHINE VIEW
FAN DRIVE MOTOR
COMPONENT AND TAP LOCATIONS
1
5
F
4 3
The steering charge filter (1) is a canister-type filter with a replaceable element. It is located under the triangular deck plate just outside the left operator compartment door. Steering charge pump discharge pressure can be checked using the pressure test port (F) that is installed in the top of the filter housing cover. The steering charge pump discharge pressure sensor (3) is installed on top of the housing, at the filter inlet (4). Not visible above is the steering charge filter bypass switch (pressure differential switch). It is installed in the housing between the filter inlet port (4) and the filter outlet port (5). (The filter inlet hose in the illustration above is in front of the switch from this angle.)
The hydraulic oil cooler (1) is an oil-to-air cooler and is mounted horizontally behind the radiator and ATAAC cores. The hydraulic oil SO•S tap is located toward the top of the vertical tube on the left side of the cooler, and is easily accessible from the left side engine compartment opening. The thermal bypass valve (3) for the hydraulic oil cooler is an internal valve, located at the left side of the cooler. It is also accessed from the left side engine compartment. Also shown above is the cooler inlet (4) and the cooler outlet (5).
If the machine is equipped with dual tilt, the dual tilt valve (1) is installed at the left front of the radiator guard, behind the left grill door. The dual tilt solenoid (2) is located at the bottom of the dual tilt valve.
The quick-drop valve (3) is located on top, center of the radiator guard. The quick-drop valve for the D9T is solenoid operated.
DUAL TILT / QUICK DROP VALVE
1 0 4 M 3 G , 5 D g 7 e a P R 4 2 N E R
8
7
6
4
5
3
2
1
LINES GROUP COLOR
DESCRIPTIO NS
MAIN PUMP OUTPUT PILOT OIL STEERING PUMP OUTPUT LIFT CYLINDER (BLADE) SUPPLY LINE
20
F
DRAIN / RETURN LINE
3A
F
LIFT and TIP CYLINDER (RIPPER) LOAD SENSING CYLINDER SINGLE TILT / DUAL TILT (OPTION) (BLADE) VALVE GROUP (REVERSING FAN OPTION) FAN MOTOR PIN PULLER
1A LINE PATTERNS
PressureLine Pilot / Load Sensing Pressure
21
Drain / Return Lines Component Group
16
Attachment
2A
Air Line
T TRANS
CALLOUTS
P
18
E
YY
Taps (Pressure, Sampling,Sensor) by letter
52
Components by number
E
20
17
23 SINGLE TILT CYL LINES
13
28 AP
HPS
DUAL TILT CYL LINES TILT CYL LINES
12
22 HPSI
HPRL
HPTR
26
HPDR
HA
D
D
4C 11
HPSO
HPRR
RIPPER TIP
HPDL
HPTL
RIPPER RAISE
BLADE TILT
BLADE LIFT
INLET MANIFOLD
14
C2
1 M 0 - G 4 D , 3 2 r o 5 l o 7 C , R e g a N P E 4 2 R
HB
C1
15
C
C
2C
25
3 5C
2B
F
6C 6
5 HD
(SERIES 31)
(SERIES 31)
R
2 1C
T
3C
P
SCREEN
B
B
P C1
24
HFPD
27 1B 7 HC
19 1 X2
4
X1
C2 T
8
11 S
A
A
9
THIS SCHEMATIC IS FOR THE D9T TRACK-TYPE TRACTOR Part #: 207-4792 CHG02 Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.
