Download - diagrama hidraulico 793C
RENR8121-00
30Page,EAR
RENR8121
October 2004
789C Off-Highway Truck
Hydraulic System
2BW659-UP
©2004 Caterpillar
All Rights Reserved
Printed in U.S.A.
Description Media Number
Specifications SENR1521
Systems Operation SENR1522
Testing and Adjusting SENR1523
Disassembly and Assembly SENR1524
Specifications: (Hydraulic System) SENR1531
Testing and Adjusting: (Hydraulic System) SENR1532
Specifications: (Steering System) SENR1525
Testing & Adjusting: (Steering System) SENR1526
Specifications: (Air System & Brakes) SENR1527
Testing & Adjusting: (Air System & Brakes) SENR1528
Specifications, System Operation, Testing &
Adjusting: (Oil Evacuation System)RENR2223
Specifications: (Suspension Cylinder) SENR1529
Schematic (Electrical System) SENR1535
Automatic Electronic Traction Aid (AETA) SENR2986
Additional Manuals
Related Manuals
Power Train
Machine Systems
Electrical System:
Tap
NumberDescription
Schematic
Location
Machine
Location
A Low Steering Pump Pressure I - 15 41
B High Steering Pressure (Accumulator) H - 13 23
C Hoist Pump Pressure (Front) G - 5 63
D Hoist Pump Pressure (Rear) G - 5 63
E Left Rear Brake Cooling Pressure J - 10 1
F Left Rear Parking Brake Pressure I - 10 32
G Right Rear Parking Brake Pressure C - 10 32
H Rear Service Brake Pressure F - 11 32
J Front Service Brake Pressure F - 3 35
K Torque Converter Charge Pump Pressure I - 6 64
L Torque Converter Lock-up Clutch Pressure I - 5 10
M Torque Converter Outlet Pressure I - 4 24
N Transmission Lube Pump Pressure E - 15 43
O Left Brake Pressure Test Port F - 10 2
P Transmission Charge Pump Pressure E - 16 37
Q Right Brake Pressure Test Port E - 10 2
R Hoist System Power Unit (Auxiliary) C - 9 38
S Steering System Power Unit (Auxiliary) G - 15 36
X Transmission System Oil (Sampling) D - 15 57
Y Hoist and Torque Converter System Oil (Sampling) H - 7 19
Z Streeting System Oil (Sampling) I - 16 36
Tap Locations
Pressure, Sampling, and Sensor
Machine
Location
Schematic
LocationDescription
Part
Number
1 B - 11,J - 11 Service and Parking Brake (Rear) 5T-4489
2 F - 9 Traction Control Valve 9G-9208
3 B - 8 Hoist Cylinders 9T-2807
4 F - 9 Check Valve (Electric Drive Pump) 9T-3086
5 E - 10 Electric Drive Pump (Parking and Secondary Brake Release) 5T-1060
6 I - 9 Brake Valve (Parking and Secondary) 149-4133
7 J - 9 Orifice 122-7765
8 J - 9 Screen 6E-5065
9 H - 9 Check Valve 138-4733
10 I - 5 Lockup Clutch and Synchronizing Valve (Torque Converter) 8E-6146
11 D - 2,I - 2 Service and Parking Brake (Front) 5T-5070
18 J - 9 Makeup Tank for Service Brake Oil 6E-1851
19 H - 7 Hydraulic Filter (Parking Brake Release) 6P-4603
20 B - 3,C - 3 Bypass Switch (5) 9X-7781
21 J - 4 Diverter Valve (Torque Converter and Front Brake Cooling) 105-0170
24 I - 5 Relief Valve (Torque Converter Outlet) 9W-7403
26 G - 11 Air Over Hydraulic Cylinder (Brake) 8W-3405
27 J - 5 Screen (Torque Converter and Front Brake Cooling) 6E-1349
28 J - 3 Oil Cooler (Front Brake Cooling) 141-4108
29 E - 3 Orifice 8W-4042
32 F - 11 Slack Adjuster (Rear) 5T-7670
33 B - 10 Oil Cooler (Rear Brake Cooling) 141-4108
34 B - 10 Screen 6E-6640
35 F - 2 Slack Adjuster (Front) 2G-5900
38 D - 8 Control Valve 132-2048
39 B - 7 Counterbalance Valve (Hoist) 132-7102
40 F - 4 Pump Drive 2A-6516
41 G - 14 Piston Pump (Steering) 6E-5650
45 C - 3,D - 3 Hoist Screens 6E-5471
48 G - 7 Rear Brake Cooling Pump Section 3E-3882
49 H - 6 Parking Brake Release Pump Selection 6T-6147
50 H - 6 Torque Converter Charging Pump Section 6T-6147
51 H - 6 Torque Converter Scavenge Pump Section 6T-6147
52 E - 7 Hydraulic Tank (Torque Converter, Hoist, Brake and Transmission) 161-0536
53 E - 6 Suction Screens 9T-3850
58 H - 4 Air Breather (Hoist, Torque Converter and Brake) 8X-4575
61 B - 11,I - 11 Service and Parking Brake (Rear) 5T-4489
62 J - 6 Relief Valve (Torque Converter Inlet) 3P--0348
63 G - 5 Hoist and Rear Brake Cooling Gear Pump 139-2454
64 I - 6 Hydraulic Filter (Torque Converter) 4T4760
66 D - 2,I - 2 Service and Parking Brake (Front) 5T-5070
73 H - 5 Torque Converter 116-5811
80 D - 9 HARC Valve 177-8840
80 E - 9 Check Valve 9T-6173
81 D - 10 Accumulator Grp. 241-3147
12 I - 15 Pressure Switch (Steering Pump Oil Low) 3E-7809
13 I - 15 Orifice 8X-7851
14 G - 13 Metering Pump (Steering) 9T-1318
22 J - 13 Steering Cylinders 4T-6797
23 I - 13 Steering Control Valve 9T-1318
30 I - 17 Accumulator Charging Valve 148-9237
36 J - 16 Solenoid and Relief Valve (Steering) 6E-3965
41 H - 15 Piston Pump (Steering) and Pressure Compensator Valve 6E-5656
42 I - 15 Orifice 1T-0936
46 J - 17 Pressure Switch (Steering Pump Oil High) 3E-6461
47 J - 16 Steering Accumulators 6E-6611
60 G - 16 Filter (Steering Pump Case Drain) 4T-4284
67 G - 16 Steering Tank 155-6660
68 G - 17 Steering Tank Filter 9J-5461
69 H - 17 Brake Relief Valve 9T-0818
70 J - 16 Check Valve (Steering) 9T-2553
20 D - 16 Bypass Switch 9X-7781
37 E - 14 Magnetic Screen (Transmission) 7T-4554
40 C - 15 Pump Drive 2A-6516
43 E - 16 Oil Cooler (Transmission) 4W-5056
44 D - 15 Relief Valve (Transmission Cooler Inlet) 2P-2859
52 B - 14 Hydraulic Tank (Torque Converter, Hoist, Brake and Transmission) 161-0536
53 B - 16 Suction Screen 9T-3850
54 C - 15 Transmission Charging Pump Section 156-8525
55 C - 15 Transmission Planetary 156-8525
56 C - 15 Transmission Scavenge Pump Section 156-8525
57 D - 16 Hydraulic Filter (Transmission Charging) 6P-4603
59 E - 13 Air Breather (Transmission) 6G-0078
65 D - 15 Hydraulic Filter (Transmission Lubrication) 6P-4603
Component Locations
Steering Hydraulic System
Transmission Hydraulic System
B
CD
G
F
HJ
K
L
M
N
Q
PSZ
X
Y
L
E
E
F
G
H
O Q
E
E
16
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit IdentificationNumber
Wire Color Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example Hydraulic Schematic Example
325-PK
Wire ColorCircuit Number
Identification
B A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer(Fluid)
Transducer(Gas / Air)
G
Generator
Electrical WirePressure Switch
MElectric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
PressureSymbol
TemperatureSymbol
LevelSymbol
FlowSymbol
Electrical Symbols (Electrical)
ONE POSITION TWO POSITION THREE POSITION
VENTEDPRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO-WAY THREE-WAY FOUR-WAY
SPRINGCONTROL VALVES RESTRICTION LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN AUX.
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
LINE RESTRICTIONVARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONERPUMP or MOTOR
FLUID POWER SYMBOLS
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLSRELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED COMPLETE INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
or MANUALSOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOIDSERVO THERMAL DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC SYMBOL SPRING LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOWPARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
(12) Steering piston pump(16) Pressure compensator valve(17) Pump drive(A) Low steering pump pressure test port.(1) Low pressure switch from steering piston pump
(5) Steering solenoid and relief valve(6) Steering check valve(18) Steering relief valve(19) Steering solenoid valve(Z) Steering system oil sampling port(S) Steering system Power Unit (Auxiliary)
(8) Steering pump case drain filter(9) Steering filter(10) Steering hydraulic tank(13) Breaker relief valve
(B) High steering pressure test port.
Top view of Rear Brake Lines
(E) Left Rear Brake Cooling Pressure
(N) Pressure Tap for Transmission Lube Pump.
(J) Pressure Tap for Front Service Brake
(H) Pressure Tap for Rear Service Brake. (O) Left Brake Pressure Test Port(Q) Right Brake Pressure Test Port.
5
N
Z
1
1
1 2 3
LM
1
2 6 7
3
45
6
23
2
P
1
2 3
Y
D
C
B
E
H
G
F
J
S
1
4
2
3
K
H
O Q
2
3
456
1
11
10
40
3
14
18
1920
20
21
22
23
24
27
22
28
2930
HH
32
33
35
36
37
384143
45
20
46
48
53 52
54
5758
60
61
62
6465
7059
66
67
6312
47
26
20
80(1)Torque converter outlet relief valve.(M)Pressure tap for torque converter outlet pressure.(2) Torque converter inlet relief valve.(L) Pressure tap for lockup clutch pilot oil.
(1) Torque converter, hoist, brake, and transmission hydraulic tank(2) Torque converter, hoist, and brake section(3) Transmission section
(1) Pump drive(2) Hoist and rear brake cooling gear pump (front section)(3) Hoist and rear brake cooling gear pump (rear section)(4) Inlet from the hydraulic tank(5) Inlet from the hydraulic tank(6) Outlet to the hoist control valve(7) Outlet to the hoist control valve
(Y) Parking Brake Filter Oil (Sampling)(6) Parking brake release hydraulic filter(23) Bypass switch(16) Torque converter and front brake cooling screen
(P) Pressure tap for the transmission charging section
(1) Torque converter and front brake cooling oil cooler(5) Torque converter and front brake cooling diverter valve
(2) Rear brake oil coolers(3) Screens for the rear brake oil coolers
(H) Pressure tap for Rear Service Brake(F) Pressure tap for Left parking brake release pressure(G) Pressure tap for Right parking brake release pressure
(1) Torque converter hydraulic filter(2) Inlet line(3) Outlet line(4) Bypass switch(K) Torque Converter Charge pump pressure
16
12
17
A
19
5
18
6
1013
8
9
73
5556
51
49
50
68 69
13
34
44
42
7
89
39
81
A
O
R
1460 67 68
2829
21
56 59
10
24 626
1227 19
20
22
11
4647
23
36
70
3066
43 33
44
64
63
4041
57 65
53 52
4849
505156
54
35
54
18
26
26
38 39
45
20
2
70 71 55
8037
32
611
72
72
A
K
B
C D J
MNZ
P
RS Y
X
Side view of steering oil lines
(1) Steering accumulators(2) Pressure switch for high pressuroil from the steering piston pump
(4) Steering cylinders(7) Steering control valve(8) Steering pump case drain filter(10) Steering hydraulic tank
(12) Steering piston pump(14) Pressure switch for low pressure
oil from the steering piston pump(15) Orifice(16) Pressure compensator valve(AA) Pressure tap for low pressure oil
from the steering piston pump
Top view of steering oil lines
(1) Steering accumulators(2) Pressure switch for high pressuroil from the steering piston pump
(3) Accumulator charging valve(4) Steering cylinders(5) Steering solenoid and relief valve
(7) Steering control valve(8) Steering pump case drain filter(10) Steering hydraulic tank(12) Steering piston pump(14) Pressure switch for low pressure
oil from the steering piston pump
RENR8121-00
30Page,Color2,DGM
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Hoist and Rear Brake Cooling Pump Circuit
Primary and Secondary Parking Brake Pump Circuit
Steering Pump Circuit
Transmission Pump Circuit
Supply Line.
Drain / Return Line.
Service and Parking Brake Circuit
Steering Cylinder Circuit
Torque Converter Charge Pump Circuit
Hoist Cylinder Circuit
Torque Converter Relief Circuit
Brake Cooling
Parking Brake
Release Hydraulic
Filter 6P-4603
Auxiliary PowerUnit Port
Metering Pump
(Steering) 9T-1318
SteeringControl Valve9T-1317
Screen
6E-6640
Hydraulic ARCValve 177-8840
Bypass Switch
116-9933
Bypass Switch
9X-7781Torque Converter
Hydraulic Filter
9T-3838
Relief Valve3P-0348
Torque Converter
Lockup Valve
8E-6146
Oil Cooler
(Front Brake Cooling)
141-4108
Torque Converter and
Front Brake Cooling
Diverter Valve 105-0170
Torque Converter
116-5811
Shuttle Valve8J-6173
Air Over HydraulicCylinder 8W-3405
High Pressure
Screen 6E-1349
Pressure Switch
(Steering Pump Oil High)
3E-6461
Steering
Accumulators
6E-6611
Check Valve (Steering)
9T-2553
Solenoid and Relief Valve(Steering) 6E-6298
AccumulaterCharging Valve148-9237
Pressure Switch(Steering Pump Oil Low)3E-7809
Orifice
8X-7851
Orifice
1T-0936
Filter (Steering Pump Case Drain)
4T-4284
Steering Cylinders
4T-6797
Piston Pump (Steering) andPressure Compensator Valve6E-5656
Transmission Planetary
Transmission Hydraulic Control
Hydraulic Filter
(Transmission Lubrication)
6P-4603
Transmission Planetary156-8525
Bypass Switch
9X-7781
Transmission Scavenge Pump
Section 156-8525
Bypass Switch
9X-7781
Pump Drive
2A-6516
Suction Screen
9T-3850
Magnetic Screen
(Transmission)
7T-4554
Air Breather
(Transmission)
6G-0078
Hydraulic Tank
(Torque Converter, Hoist, Brake and Transmission)
161-0536
Air Over Hydraulic Cylinder
(Brake) 8W-3405
Shuttle Valve
8J-6173
Slack Adjuster (Rear)
5T-7670
Service and Parking Brake
(Rear) 5T-4489
Oil Cooler
(Rear Brake Cooling)
141-4108
Check Valve
9T-3752
Accumulator Group
241-3147
Electric Drive Pump:
Parking and Secondary
Brake Release
5T-1060
Electric Drive Pump
Check Valve
9T-3096
Check Valve
138-4733
Screen
6E-5065
Parking and
Secondary
Brake Valve
149-4133
Bypass Switch
9X-7781
Bypass Switch
9X-7781
Bypass Switch
9X-7781
Rear Brake
Cooling Pump
Section 3E-3882
Parking Brake
Release Pump
Selection 6T-6147
Torque Converter, Hoist,
Brake and Transmission
Hydraulic Tank 161-0536
Hoist and Rear Brake
Cooling Gear Pump
139-2454
Torque Converter
Charging Pump
Section 6T-6147
Slack Adjuster
2G-5900
Service and
Parking Brake
(Front) 5T-5070
Service and
Parking Brake
(Front) 5T-5070
Orifice
8W-4042
Hoist Screens
6E-5471
Hoist Screens6E-5471
Counterbalance Valve
(Hoist) 132-7102
Hoist Cylinders
9T-2807
Control Valve
245-1662
Suction Screens9T-3850
Pump Drive
2A-6516
Piston Pump (Steering)6E-5650 - See Steer System
Suction Screen9T-3850
Motor
VENT ORIFICE FORCOUNTERBALANCE VALVE
SIGNAL ORIFICE #2
SIGNAL ORIFICE #1
LOW PRESSURE RELIEF
HIGH PRESSURE RELIEF
DUAL STAGESIGNAL SPOOL
ROD END VENTSLOT ACROSS STEM
MAIN RELIEFDUMP SPOOL
HOLD
RAISE
SNUB
FLOA T
LOWER
BRAKE COOLING RELIEF
LEFT REAR
RIGHT REAR
RIGHT FRONT
LEFT FRONT
TORQUE CONVERTER
LOCK-UP
VALVE
PUMPDRIVEBOX
)(
)()(
)(
Low SteeringPressure Switch
Low Steering PumpPressure Test Port
OIL
SAMPLE
PORT
High SteeringPressure Test Port
P
LSHP HT
T
EF
RL
CRCL
TRANSMISSIONHYD
CONTROLS
PUMPDRIVEBOX
HOIST, BRAKE COOLING, AND TORQUE CONVERTER SYSTEMSTRANSMISSION
STEERING SYSTEM
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
A
B
C
D
E
F
G
H
I
J
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
A
B
C
D
E
F
G
H
I
J
K K
THIS SCHEMATIC IS FOR THE 789C OFF HIGHWAY TRUCK
PART #: 158-3405 CHG 01
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
Steering Tank
155-6660
Steering Tank
Filter 9J-5461
BreakeReleif Valve9T-0818
Transmission Charging Pump Section156-8525
Hydraulic Filter(Transmission Charging)6P-4603
Oil Cooler
(Transmission)
4W-5056
Transmission CoolerInlet Relief Valve2P-2859
Service and Parking
Brake (Rear) 5T-4489
Traction Control
Vlave 9G-9208
Makeup Tank for
Service Brake Oil
6E-1851
Orifice
122-7765
Suction Screen9T-3838
Torque Converter
Scavenge Pump
Section 6T-6147
Torque Converter
Outlet Relief Valve
9W-7403
Hoist, Torque Converter
and Brake Air Breather
8X-4575
P
X
N
Z
B
S
A
S
H
F
E
O
Q
Y
K
L
M
D
C
J
R
G
Auxiliary PowerUnit Port
Right BrakePressureTest Port
Left BrakePressureTest Port