A Book with title "Design and Manufacturing of Hydraulic Presses" is written to guide students to design and manufacture Hydraulic Press themself. This book "Introduction to Hydraulic Press…Full description
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Descrição: Apostila protheus V12
ST14
Hydraulic Introduction
COMMITTED TO SUSTA SUSTA INAB L E PRODUCTIVITY PRODUCTIVITY
We stand by our responsibilities towards our customers, towards the environment and the people around us. We make performance stand the test of time. This is what we call – call – Sustainable Productivity. Productivity.
COMMITTED TO SUSTA SUSTA INAB L E PRODUCTIVITY PRODUCTIVITY
We stand by our responsibilities towards our customers, towards the environment and the people around us. We make performance stand the test of time. This is what we call – call – Sustainable Productivity. Productivity.
OBJECTIVES
You will know the Atlas Copco Scooptram ST14, from the inside and the outside, including the hydraulic & electrical systems, basic maintenance routines and troubleshooting.
Content Overview Safety and how to Drive Hydraulics Introduction Electrical System Control System (RCS) Engine and Fuel System
Transmission and Axles D/H & Steering System Brake System General Maintenance Troubleshooting Options
Towing
Brakes
Dump & Hoist
EOD
Emergency steering system LS Pumps Brakes
Cooling and Steering
filtering
Tank
H O W T H E C O M P O NE N TS A R E N A M E D :
Each component has a unique designation that describes the type of component followed by a number. The designation can be found on the hydraulics schematics and installation drawings. Designation Function
Designation Function
Designation Function
AB Air Breather
FF Filter Fuel
RE REstriction
ABL Air BLeed-off
FFH Filter Fuel with Heater
REV REstriction unaffected by Viscosity
ABP Air Breather with Pressure relief
FIP FIlter Pressure line
RV pressure Release Valve
ACC ACCumulator
FIR FIlter Return
RVA pressure Release Valve Adjustible
AUV AUxiliary Valve
FLA Fow Amplifier
RVB Relay Valve Brake
BJB Bogie Junction Block
FSA Fire Supression Actuator
SEVS SElector Valve Spring centered
BRJ Brake Junction block
FSB Fire Supression junction Block
SG Sight Gauge
CBL Cylinder Boom Lift
FSE Fuel Shut off valve Electric
SHV SHuttle Valve
CBT Cylinder Bucket Tilt
FSM Fuel Shut off valve Manual
STJ STeering Junction block
CCTS Cylinder Cab Tilt, Single acting
FSR Fire Supression Remote actuator
STU STeering Unit
CDT Cylinder Dump Telescopic
FST Fire Supression Tank
SUV SUspension Valve
CEJ Cylinder EJect-o-dump
FTR Filter Transmission
SV Solenoid Valve
CO COoler
HE Heater
SVB Solenoid Brake Valve
CST Cylinder STeering
JBL Junction BLock
TAO TAnk Open to atmosphere
CSU Cylinder SUspension
LID Lubrication Inductive piston Detector
TAP TAnk Pressurized
CTHS Cylinder Tow Hook, Single acting
LUB LUbrication Bulkhead plate
THV Tow Hook Valve
CV Check Valve
LUJ LUbrication Junction block
TVM Throttle Valve Manual control
CVC Check Valve with certain Closing pressure
LUP LUbrication Pump
TVME Throttle Valve MEchanical control
CVM Control Valve Manual
HPB Hand Pump Brake
TVP Throttle Valve Pressure control
CVP Check Valve with certain opening Pressure
HPO Hand Pump Oil fill
VMC Valve Main Control
DCV Directional Control Valve
OFE Oil Fill Electric
VP Variable capacity Pump
DUJ DUmp Junction block
PBV Parking Brake Valve
FCE Fixed Capacity pump Electric driven
PCL Pilot Control Lever
FCM Fixed Capacity Motor
PCV Pilot controlled Check Valve
FCP Fixed Capacity Pump
PL PLugged line
FEO Filter Engine Oil
QC Quick-acting Coupling
FEW Filter Engine Water
QCV Quick-acting Coupling Valve block
VPPC Variable capacity Pump Pressure Compensated
VPLS Variable capacity Pump Load Sensing
VTV Variable Throttle Valve
H O W T H E H O S E S A R E D E F I NE D
I=internal F=flange E=external
Part number
Designation
Length [mm]
Inner diameter [mm]
Maximum pressure [bar]
Coupling type
H Y D R A U L I C S L O C A TIO N L O A D F R A M E
Stab cyl CBT
BRJ1 QCV2 B411a, B411b, (B412a) (B412b)
Boogie junction block BJB
Hoist cyl CBL Ride ctrl, ACC2
H Y D R A U L I C S L O C A T IO N P O W E R F R A M E
Hydraulic filter FIR
Accumulator ACC1 Breather ABP
Transmission filter
Hydraulic oil fill pump OFE Dump and Hoist valve VMC
Brake hand pump HPB
Brake junction block BRJ4 Check Valve CVP1
H Y D R A U L IC S L O C A T IO N P O W E R F R A M E Auxiliary valve AUV Brake valves PBV, SVB
Brake junction block BRJ3 Towhook THV & PCV1
Brake valve RVB
Steering STJ
QCV1 B348(CF), B355(TCP), B359(BRP), B410(BAP)
H Y D R A U L I C TA N K One tank for all systems (steering, brakes,
1.
Tank air breather filter / pressurize
2.
Return filter
dump & hoist, etc )
Tank breather Return filter
Tank must always be filled through return filter
1
2 3
Sight glass
Fill pump
1.
Fill pump on/off
2.
Fill pump
3.
Quick fill (wiggins)
Service Manual
PUMPS
Variable Load Sensing Pump VPLS1
Variable Load Sensing Pump VPLS2
For D/H & Steering
For Brake and D/H & Steering
Double gear pump FCP For filtering and cooling hydraulic and brake oil
HYDRA UL ICS INTRODUCTION
The load sensing hydraulic system Load sensing system
Open center system
e r u s s e r P
e r u s s e r P
Losses
Load 1
Load 1
Losses
Max Qpump
Flow
Qpump
Flow
The open center hydraulic system will always deliver maximum flow meaning great losses in some cases The load sensing system only delivers the required flow for the actual load which means almost no losses
HYDRA UL ICS INTRODUCTION
The load sensing hydraulic system
e r u s s e r P
Losses
Load 1
Delta P (∆PLS)
Load 2 Max Qpump
Flow The pump will deliver the pressure demanded by the highest load (Load 1) and add a compensating pressure called Delta P (20-25 Bar) to maintain a constant pressure drop across the valve spool and to compensate for any pressure drop during delivery to e.g. the hydraulic cylinder Pump pressure = The pressure needed for the act ual load + Delta P (∆P LS) pressure
HYDRA UL ICS INTRODUCTION
The load sensing hydraulic system
Load Sensing system
VS
Open Center system
The pump in a load sensing system only deliver the flow requested by the function (variable pump)
The pump in a open center system always deliver full flow (fixed pump)
A load sensing (LS) system has a closed center in the main valve
A open center system has (as the name says) an open center in the main valve
The pump in a load sensing (LS) system maintains a low stand-by pressure (or delta P) when no function is used and don't deliver any flow (closed center)
The pump in an open center system circulates the oil through the valve (because of the open center) and back to tank when no function is used
In a load sensing system you control the speed (flow) for the function with the lever
In a open center system you control the pressure for the function with the lever
“OPEN CENTER”
VS.
Pump pressure regulated as a function of the load (valid for both)
“LOAD SENSING” Pump flow regulated as a function of the lever position
B R A K E P U MP
140
100 bar
D /H P U M P 20
Standby Pressure To D/H valve
Cut off Pressure
285
120 20 bar
H O W T O S E T P R E S SU R E Step 1
Turn the LS-cutoff pressure valve screw 2 (two) turns clockwise to open the LS-cutoff pressure valve . LS-CPV
H O W T O S E T P R E S SU R E Step 2
Put a pressure gauge on PX – Turn out both adjustments screw 2 turn on VPLS2 – Start engine, run on idle: – Adjust the stand by pressure on VPLS1 to 20 bar ± 1 – Adjust the stand by pressure on VPLS2 to 23 bar ± 1 – Activate boom down (all the way down to boom stop and hold it there) – Adjust the cutoff pressure on VPLS1 to 285 bar ± 2 – Adjust the cutoff pressure on VPLS2 to 290 bar ± 2
H O W T O S E T P R E S SU R E Step 3
(Put a Pman on B411:B on loadframe) – Start engine, run on idle: – Activate boom down (all the way down to boom stop and hold it there) – Adjust the LS-cutoff pressure valve screw to 280bar ± 2 – Done
LS-CPV
H O W T O S E T P R E S SU R E Brakes
WARNING/NOTE Block wheels before setting brake pressure
Put a pressure gauge on B410 port. – Start engine, run on idle: – Adjust the pressure on brakepump VPLS2 to 140 bar ± 2
C O M M IT T E D T O S U S T A I N A B L E PRODUCTIVITY.
