INTERACTIVE SCHEMATIC Bookmarks
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EC-C2 EC-C3
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E-C60 E-C61
VIEW ALL CALLOUTS EC-C1
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ELECTRICAL SYMBOLS
HOTKEYS (Keyboard Shortcuts)
BASIC HYDRAULIC COMPONENTSYMBOLS
T
FUNCTION
KEYS
Zoom In
“CTRL” / “+”
Zoom Out
“CTRL” / “-”
Fit to Page
“CTRL” / “0” (zero)
Hand Tool
“SPACEBAR” (hold down)
Find
“CTRL” / “F”
Pressure Switch
Temperature Switch
Level Switch
Flow Switch
Circuit Breaker
Click here to view the Schematic Symbols and Definitions page
Pump or Motor
Variability
Fluid Conditioner
Spring (Adjustable)
SCHEMATIC SYMBOLS AND DEFINITIONS VALVES
INTERNAL PASSAGEWAYS
ENVELOPES
Two Position
One Position
Three Position
PORTS
Two-way
Three-Way
FLOW IN ONE DIRECTION
FLOW ALLOWED IN EITHER DIRECTION
Infinite Positioning
Two Position
PARALLEL FLOW
PUMPS
Unidirectional
Three Position
BASIC HYDRAULIC COMPONENT SYMBOLS
FIXED DISPLACEMENT
CROSS FLOW
Pump or Motor
Variability
Fluid Conditioner
Spring (Adjustable)
Spring
Pressure Compensation
Control Valves
Line Restriction (Variable)
Restriction
Line Restriction (Fixed)
Line Restriction Variable and Pressure Compensated
2-Section Pump
Attachment
Pump: Variable and Pressure Compensated
Bidirectional
VARIABLE DISPLACEMENT NON- COMPENSATED
CYLINDERS
Four-Way
Unidirectional
Bidirectional
CONTROL A B
A B
P T
P T
Single Acting
FIXED DISPLACEMENT
Shifted Position
Normal Position
MOTORS
Double Acting
Infinite Position
CHECK
ACCUMULATORS Basic Symbol
Spring Loaded
Shuttle
Unidirectional
Bidirectional
VARIABLE DISPLACEMENT NON- COMPENSATED
Pilot Controlled
Spring Loaded Gas Charged
Unidirectional
Bidirectional MAIN AUX.
PILOT CONTROL
ROTATING SHAFTS
RELEASED PRESSURE
Unidirectional
External Return
Internal Return
Bidirectional
REMOTE SUPPLY PRESSURE
Simplified
Complete
Internal Supply Pressure
Hydraulic Pneumatic Energy Triangles
COMBINATION CONTROLS LINES
Solenoid
Solenoid or Manual
Solenoid and Pilot
Solenoid and Pilot or Manual
Servo
Thermal
Detent
Crossing
MEASUREMENT
Joining
MANUAL CONTROL
Push-pull Lever
Manual Shutoff
Pressure
Temperature
Flow
FLUID STORAGE RESERVOIRS
General Manual
Push Button
Pedal
Spring
Vented
Pressurized
Return Above Fluid Level
Return Below Fluid Level
ELECTRICAL SYMBOLS
HYDRAULIC SYMBOLS - ELECTRICAL
M
G
T
Transducer (Fluid)
Transducer (Gas / Air)
Generator
Electric Motor
Pressure Switch
Pressure Switch (Adjustable)
Temperature Switch
Electrical Wire
Pressure Switch
Temperature Switch
BASIC ELECTRICAL COMPONENT SYMBOLS
Level Switch
Flow Switch
Circuit Breaker
HARNESS AND WIRE SYMBOLS Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component.
L-C12 3E-5179
AG-C4 111-7898
1
Part Number: for Connector Plug
2
Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.
Receptacle Pin or Socket Number
Plug
Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...) Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...)
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
T
Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure. Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay. Solenoid: A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work. Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.
L-C12 3E-5179 5A Fuse (5 Amps)
9X-1123
Component Part Number
325-AG135 PK-14 Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".
Wire Gauge Wire Color
1 2
Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
1 2
Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
RENR8305-05 November 2012
777F Off-Highway Truck Hydraulic System JRP1-UP JXP1-UP
Volume 1 of 2: Brakes and Hoist Volume 2 of 2: Steering and Powertrain
COMPONENT LOCATION Volume 1 of 2 - Brakes and Hoist Component Locations (Volume 1) Machine Location 1 2A 2B 3 4A 4B 5 6 7 8 9 10 11A 11B 12 13 14 15 16 17 18 19 20 21 22 23 24 26 27 28 29 35 47 54 58 59
Description
TANK GP (HYD & TRANS) PUMP GP (BRAKE CHARGING) PUMP GP (BRAKE CHARGING) PUMP GP (BRAKE COOLING) PUMP GP (HOIST) PUMP GP (HOIST) VALVE GP - ACCUMULATOR CHARGING VALVE GP - MTG & (PARKING BRAKE) CONTROL GP - HYD (BRAKE RETRACT) ADJUSTER GP - SLACK (REAR) ADJUSTER GP - SLACK (FRONT) BRAKE GP - SERVICE & PARK BRAKE GP - SERVICE (FRONT BRAKES) BRAKE GP - SERVICE (FRONT BRAKES) VALVE GP (CAB MANIFOLD) VALVE GP - CHECK SWITCH AS. - PRESSURE PUMP GP - ELECTRIC (BRAKE RETRACT) VALVE GP - DIVERTER VALVE GP - RELIEF FILTER (BREATHER) SWITCH AS. - PRESSURE ACCUMULATOR GP (BRAKE) PEDAL GP - BRAKE VALVE VALVE GP - CONTROL (HOIST) CYLINDER GP - TELESCOPING (HOIST) PLATE-ORIFICE (HOIST) SCREEN AS. SCREEN AS. (BRAKE COOLING) CORE AS. - OIL COOLER FILTER GP - OIL (BRAKE) PUMP GP - ELECTRIC (STEERING) SCREEN AS. PUMP GP - ELECTRIC (ENGINE OIL) VALVE GP - CHECK VALVE AS. - SHUTTLE
Part Number 258-9852 255-5478 256-0561 255-5478 255-5478 256-0561 257-0273 289-0585 222-4744 205-0557 8X-7921 243-5545 8X-3810 243-5551 261-1316 249-5521 3E-7806 230-2637 3G-2887 228-7839 8X-4575 160-2609 220-5692 261-1317 245-1668 171-1232 8X-7224 7J-3723 6E-6640 141-4109 155-6061 230-2637 7J-0725 230-2637 185-4026 8J-6875
Schematic Location A-4 B-5 B-4 B-4 B-4 B-4 D-5 F-6 D-7 D-8 D-2 B-8, F-8 D-1, F-1 D-1, F-1 F-4 E-4 E-4 D-5 E-6 E-5 A-6 F-6 E-5 F-3 B-3, C-3, D-3 A-3 A-3 A-4 B-6, C-7 B-6, C-7 C-5 D-6 A-5 D-5 E-5 E-3
COMPONENT LOCATION Volume 2 of 2 - Steering and Powertrain Component Locations (Volume 2) Machine Location 1 15 18 25
TANK GP (HYD & TRANS) PUMP GP - ELECTRIC (BRAKE RETRACT) FILTER (BREATHER) FILTER GP - OIL
Part Number 258-9852 230-2637 8X-4575 249-2306
26 30 31 32 33 34 35
SCREEN AS TANK GP - HYD (STEERING) PUMP GP - PISTON (STEERING) VALVE GP - CHECK (STEERING) PUMP GP - METERING (STEERING) CYLINDER GP - (STEERING) PUMP GP - ELECTRIC (STEERING)
7J-3723 249-2925 261-5630 175-7050 195-6617 105-2440 230-2637
36
SWITCH AS. - PRESSURE (STEERING PUMP OIL LOW PRESSURE)
313-5104
D-8
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 60 61
SWITCH AS. - PRESSURE (SECONDARY STEERING) FILTER GP - OIL (STEERING) FILTER GP - HYD (STEERING) VALVE - BREAKER RELIEF PUMP GP - GEAR (TORQUE CONV. SCAVENGE) FILTER GP - OIL (TORQUE CONV. CHARGING) VALVE GP - MODULATING (TORQUE CONV. LOCKUP CLUTCH) FILTER GP - OIL (TRANSMISSION) FILTER GP - OIL (TRANSMISSION) SWITCH AS. - LIQUID LEVEL SCREEN AS. CONVERTER GP - TORQUE VALVE GP - RELIEF (TORQUE CONV. OUTLET) PUMP GP - GEAR (TORQUE CONV. CHARGE) PUMP GP - GEAR (LOCK-UP CLUTCH VALVE PILOT) PUMP GP - GEAR (TRANSMISSION SCAVENGE) PUMP GP - GEAR (TRANSMISSION CHARGING) PUMP GP - ELECTRIC (ENGINE OIL) VALVE GP - RELIEF (TORQUE CONV. INLET) CORE GP - OIL COOLER VALVE GP - CHECK VALVE GP - RELIEF VALVE GP - MANIFOLD & SOLENOID (STEERING DISABLE)
9X-4455 173-0159 249-2334 9T-0818 256-6123 4T-4760 244-3114 244-0121 270-5181 172-8660 7J-0725 249-5539 3P-0349 256-6123 256-6123 256-6123 256-6123 230-2637 3P-0348 4W-5056 268-3451 268-3998 277-8869
E-6
Description
Schematic Location C-4 D-6 C-4 D-2 C-3 A-7 B-6 E-7 E-7 F-7 D-6
B-7 C-8 B-5 D-3 D-3 E-3 F-3 F-3 B-2 C-2 D-4 F-4 D-3 D-3 D-2 D-2 D-5 C-3 C-2 C-2 E-2 C-8
TAP LOCATION Volume 1 of 2 - Brakes and Hoist
Tap Locations Pressure, Sampling, and Sensor (Volume 1) Tap Number A
Description
Schematic Location
LEFT REAR SERVICE BRAKE
F-8
B
RIGHT REAR SERVICE BRAKE
B-8
C
REAR SLACK ADJUSTER INPUT
D-8
D
CAB MANIFOLD RESOLVER OUTPUT
F-4
E
ACCUMULATOR CHARGING OUTPUT
D-4
F
BRAKE CHARGING PUMP OUTPUT
D-4
G
LEFT PARK BRAKE
D-7
H
RIGHT PARK BRAKE
C-7
J
FRONT SLACK ADJUSTER INPUT
E-1
K
DRY FRONT BRAKE INPUT
E-1
L
CYLINDER HEAD END
A-3
M
CYLINDER ROD END
A-3
N
HOIST PUMP OUTPUT
C-4
R
HOIST VALVE LOWER PILOT
D-3
P
HOIST VALVE RAISE PILOT
B-3
S
BRAKE COOLING INPUT
B-7
CONNECTOR / TAP LOCATION Volume 2 of 2 - Steering and Powertrain Tap Locations Pressure, Sampling, and Sensor (Volume 2) Tap Number
Description
Schematic Location
T
HMU INPUT
E-7
U
STEERING LOAD SENSE PILOT
D-8
W
LOCK-UP CLUTCH
E-3
X
LOCK-UP CLUTCH FILTER OUTPUT
D-3
Y
TRANS CHARGE FILTER OUTPUT
F-3
Z
TC OUTLET RELIEF VALVE
F-4
V
SOS
C-8
8
7
6
5
4
(10) BRAKE GP SERVICE AND PARK 243-5545 BLEEDDOWN SOLENOID
3
D
(12) VALVE GP (CAB MANIFOLD) 261-1316
(14) SWITCH AS PRESSURE 3E-7806
2
1
(21) PEDALGP BRAKE VALVE 261-1317
DRY WET
See Note A
A1
1
(11B) BRAKE GP SERVICE (FRONTBRAKES) 243-5551
PARK BRAKE SOLENOID
F
(19) SWITCH AS PRESSURE 160-2609
LEFTREAR
A
F
LEFT FRONT
(6) VALVE GP MTG AND PARKING BRAKE 289-0585 (16) VALVE GP DIVERTER 3G-2887
3
P1
P
4
T1
T
A
LEFT FRONT
ECM
5
(11A) BRAKE GP SERVICE (FRONTBRAKES) 8X-3810
(17) VALVE GP RELIEF 228-7839 P2
FromTorqueConver ter Lock-upClutchPilot (Volume2,F-3)
E
(58) VALVE GP CHECK 185-4026
(35) PUMP GP ELECTRIC (STEERING) 230-2637
(7) CONTROLGP HYDRAULIC (BRAKE RETRACT) 222-4744
(54) PUMP GP ELECTRIC (ENGINE OIL) 230-2637
(59) VALVE AS SHUTTLE 8J-6875
E
E
K
J (13) VALVE GP (14) SWITCH AS CHECK PRESSURE 249-5521 3E-7806
E
M
G
C
(20) ACCUMULATOR GP (BRAKE) 220-5692
RAISERELIEF
MAINRELIEF DUMPSPOOL
D
(9) ADJUSTER GP SLACK (FRONT) 8X-7921
FromTorqueConver ter Lock-upClutch. (Volume2,F-3)
(15) PUMP GP ELECTRIC (BRAKE RETRACT) 230-2637
(8) ADJUSTER GP SLACK(REAR) 205-0557
DUALSTAGE SIGNALSPOOL
(11A) BRAKE GP SERVICE (FRONT BRAKES) 8X-3810
LOWERRELIEF LOWER, FLOAT, SNUB SOLENOID
D
D
R (5) VALVE GP ACCUMULATOR CHARGING 257-0273
H (28) CORE AS OILCOOLER 141-4109
RIGHT FRONT
F RIGHT FRONT
(11B) BRAKE GP SERVICE (FRONTBRAKES) 243-5551
(27) SCREEN AS (BRAKE COOLING) 6E-6640 FromTorqueConvert er
A
Lock-upClutch.(Volume2,E-2)
B
(29) FILTER GP OIL(BRAKE) 155-6061
FromTorqueConver ter (Volume2,F-4)
C
FRONT BRAKES
RAISE HOLD
C
SNUB
(3) PUMP GP (BRAKE COOLING) 255-5478
(28) CORE AS OILCOOLER 141-4109
(27) SCREEN AS (BRAKE COOLING) 6E-6640
(4A) PUMP GP (HOIST) 255-5478
LINE PATTERNS
BRAKECOOLINGRELIEF
LOWER
Pressure Line
(4B) PUMP GP (HOIST) 256-0561
B RIGHTREAR
FLOAT
N
See Note A
Pilot / Load Sensing Pressure
(2A) PUMP GP (BRAKE CHARGING) 255-5478
S B
Drain / Return Lines ComponentGroup
P
B
Attachment Air Line
See Note A (10) BRAKE GP SERVICE AND PARK 243-5545
CALLOUTS
RAISESOLENOID
(2B) PUMP GP (BRAKE CHARGING) 256-0561
(18)FILTER (BREATHER) 8X-7224
YY
Taps (Pressure,
Sampling,Sensor)by letter
Note A: Dry brake configuration HYDRAULICCIRCUITCOLORDESCRIPTIONS
(22) VALVE GP CONTROL(HOIST) 245-1668
L
A
(47) SCREEN AS 7J-0725
(26) SCREEN AS 7J-3723
M
ELECTRICALCIRCUITS BRAKE CHARGING CIRCUITPUMP HOISTCYLINDERS CIRCUIT HOISTPUMPCIRCUIT PUMPSUPPLYLINE DRAIN/ RETURNLINE BRAKECOOLING LOCK-UPCLUTCHVALVE PUMPCIRCUIT
(24) PLATE ORIFICE (HOIST) 8X-7224
BRAKE CIRCUIT(FRONTAND REAR)
(1) TANK GP HYDRAULIC AND TRANSMISSION 258-9852
THIS SCHEMATICIS FOR THE 777F OFF-HIGHWAY TRUCK HYDRAULICSYSTEM
(23) CYLINDER GP TELESCOPING (HOIST) 171-1232
VOLUME 1 of2: BRAKES ANDHOIST
MEDIA NUMBER: RENR8305-05 SCHEMATICPART NUMBER: 255-6188, CHANGE: 07, VERSION: Componentsareshowninstalledona fullyoperablemachinewiththekeyand engineoff,transmissionshifter inneutralandwithparkingbrakeset. RefertotheappropriateServiceManualforTroubleshooting,Specifications andSystemsOperations.
8
7
6
5
4
3
2
1
A
8
7
6
5
4
(49) VALVE GP RELIEF (TORQUE CONV. OUTLET) 3P-0349
(34) CYLINDER GP STEERING 105-2440
3
TO BRAKE COOLING
B
ToTractionControl Valve
ToHoist Pilot SignalResolver
F
D
E
1
(44) FILTER GP OIL (TRANSMISSION) 244-0121 (45) FILTER GP OIL (TRANSMISSION) 270-5181 F
Z
(33) PUMP GP METERING (STEERING) 195-6617
2
Y ToRockfordFan ClutchControl (Attachment)
(43) VALVE GP MODULATING (TORQUE CONV. LOCKUP CLUTCH) 244-3114
(36) SWITCH AS PRESSURE (STEERING PUMP OILLOW PRESS) 313-5104
E
T (32) VALVE GP CHECK (STEERING) 175-7050
A
W
(15) PUMP GP ELECTRIC (BRAKE RETRACT) 230-2637
TO BRAKE COOLING
LOCK-UPCLUTCH PRESSURE
(37) SWITCH AS PRESSURE (SEC STEERING) 9X-4455
(60) VALVE GP RELIEF 268-3998
X TORQUE CONVERTER
M D
E
LOCK UP VALVE
U
(35) PUMP GP ELECTRIC (STEERING) 230-2637
(54) PUMP GP ELECTRIC (ENGINE OIL) 230-2637
(25) FILTER GP OIL 249-2306
(42) FILTER GP OIL(TORQUE CONV. CHARGING) 4T-4760
(52) PUMP GP GEAR (TRANSMISSION SCAVENGE) 256-6123 (53) PUMP GP (51) PUMP GP GEAR GEAR (LOCK-UP (TRANSMISSION CHARGING) CLUTCH VALVE PILOT) 256-6123 256-6123
(50) PUMP GP GEAR (TORQUE CONV. CHARGE) 256-6123
ECM
D HYDRAULIC CONTROLS
TRANSMISSION
HMU SS
LST
LS
(41) PUMP GP (48) CONVERTER GP GEAR TORQUE (TORQUE CONV. SCAVENGE) 249-5539 256-6123
B
(18) FILTER BREATHER 8X-4575
C
SOS
C
A
(56) CORE GP OILCOOLER 4W-5056
(55) VALVE GP RELIEF (TORQUE CONV. INLET) 3P-0348
C
(57) VALVE GP CHECK 268-3451
V
(61) VALVE GP MANIFOLD AND SOLENOID (STEERINGDISABLE) 277-8869 (1) TANK GP HYDRAULIC AND TRANSMISSION 258-9852
B
(40) VALVE BREAKERRELIEF 9T-0818
(39) FILTER GP HYDRAULIC (STEERING) 249-2334 (38) FILTER GP OIL(STEERING) 173-0159
(26) SCREEN AS 7J-3723
(46) SWITCH AS LIQUID LEVEL 172-8660
(47) SCREEN AS 7J-0725
B
POWERTRAIN: TRANSMISSION AND TORQUE CONVERTER
(31) PUMP GP PISTON (STEERING) 261-5630
(30) TANK GP HYDRAULIC (STEERING) 249-2925
HYDRAULICCIRCUITCOLORDESCRIPTIONS ELECTRICALCIRCUITS TRANSMISSIONANDTORQUE CONVERTERSCAVENGE PUMPCIRCUIT
LINE PATTERNS
PUMPSUPPLYLINE
PressureLine
DRAIN/ RETURNLINE
Pilot / LoadSensingPressure
BRAKE COOLING STEERING PUMPCIRCUIT
Drain/ ReturnLines
SECONDARYSTEERING PUMPCIRCUIT
ComponentGroup
A
TRANSMISSIONCHARGE PUMPCIRCUIT LOCK-UPCLUTCHVALVE PUMPCIRCUIT
Attachment
A
TORQUE CONVERTERCHARGE PUMPCIRCUIT
AirLine THIS SCHEMATICIS FORTHE 777F OFF-HIGHWAY TRUCK HYDRAULICSYSTEM
CALLOUTS
LOAD SENSE STEERING SYSTEM
YY
VOLUME 2of 2:STEERING ANDPOWERTRAIN
MEDIA NUMBER: RENR8305-05 SCHEMATICPART NUMBER: 255-6188, CHANGE: 07, VERSION: -
Taps (Pressure,Sampling,Sensor)byletter
Componentsareshowninstalledona fullyoperablemachinewiththekeyand engineoff,transmissionshifter inneutralandwithparkingbrakeset. RefertotheappropriateServiceManualforTroubleshooting, Specifications andSystemsOperations.
8
7
6
5
4
3
2
1
MACHINE TOP VIEW - BRAKES AND HOIST
47
24 23
19
4 18
26
6
1
10
VIEW ALL CALLOUTS
20
29
21
14
3 2
11
17 16
5 9
7
CAB 14 12 8 58 15 35 54
27
10
28 23 24
59
22
11
BRAKING VIEW 4B 4A
VIEW ALL CALLOUTS
3
2B 2A
8
29 The brake system oil filter (29) is located on the left outer frame rear next to the left rear strut mount. The brake system oil filter has a bypass switch. Shown in the visual is the new location of the hoist pump (4A, 4B). The hoist pump is a gear type pump and is attached to the brake cooling pump (3) and the brake charging pump (2A, 2B). The hoist pump is now driven by the gears at the back of the engine.
9
E
5 Pressure Switch
The 777F has two slack adjusters. The top visual is of the rear slack adjuster (8). The rear slack adjuster is located above the rear differential. The slack adjuster maintains a consistent feel and application of the brakes as the brake discs wear.
20 Shown in the visual are the three brake accumulators for the 777F. The accumulators (20) are charged by the brake charging pump and supply the required oil flow to disengage the front and rear brakes. The outer accumulators are for the rear service brakes. The middle accumulator is for the parking brake and front service brakes. A check valve in the circuit between the parking accumulator and the rear service accumulators allows only the parking brake accumulator to be filled when using the secondary electric pump.This allows the parking brake to be released by using the secondary electric pump.
Parking Brake Solenoid
6 Purge Solenoid
F
The lower visual is of the front slack adjuster (9). The front slack adjuster is located on the left strut frame support. The slack adjuster maintains a consistent feel and application of the brakes as the
Relief Valve The accumulator charging valve (5) is located on the left side of the frame by the brake accumulators This valve directs oil to the brake accumulators, brake cooling, and the tank. Once the accumulators are charged, the excess oil flow is sent to cool the brakes before returning to the tank.
17 16
The Brake ECM monitors the pressure in the service brake accumulators with pressure switch. If the pressure in the service brake accumulators are low, the pressure switch will open and the Brake ECM will signal the monitoring system to turn on the brake system-check indicator. Pressure tap (E) is used to check the oil pressure in the service brake accumulators. Pressure tap (F) is used to check the charge oil pressure from the pump. The accumulator charging valve contains a CUT-IN/CUT-OUT spool. Once the maximum brake system pressure is reached, the spool will shift and send the excess flow to brake cooling. As the system pressure continues to drop to the CUT-IN pressure setting, the spool will shift again and the system will charge to the CUT-OUT pressure setting. This process will continue to repeat as often as needed to keep the brake system fully charged. The CUT-IN/CUT-OUT pressure is checked at pressure tap (B). The relief valve setting is set slightly higher than the CUT-OUT pressure setting. In the event that the CUT-IN/CUT-OUT valve spool fails, the relief valve will protect the system from extreme pressure. Relief valve can only be tested on a hydraulic test bench.
This visual shows the parking brake valve (6) for the 777F which is located on the inside left frame rail behind the middle cross member. The parking brake release valve no longer works off pressurized air. This valve receives oil flow from the parking brake accumulator. Contained within the valve is a parking brake solenoid valve and a purge solenoid valve.
Shown in this visual is the diverter (towing) valve (16) for the 777F. The diverter valve functions the same however has changed locations. The diverter valve for the 777F is now located on the left frame rail in front of the left front strut. The diverter valve must be manually shifted before towing. Once the valve is shifted, oil flow from the electric secondary pump is directed to the parking brake valve to release the parking brake. The relief valve (17) limits the maximum pressure when using the towing pump.
HOIST VIEW VIEW ALL CALLOUTS
4B 4A
Shown in the visual is the new location of the hoist pump (4A, 4B).
22
Shown in the visual is the new location of the hoist control valve (22). The valve (22) is located behind the engine on the right side of the frame. The valve (22) will function the same as the hoist control valve on the 777D.
P Shown in the visual to the left are the pressure taps for the hoist control valve. The pressure tap (R) checks the pilot pressure for the hoist lower solenoid. The pressure tap (P) checks the pilot pressure of the raise solenoid.
R
Shown in the visual to the right are the pressure taps for the hoist cylinders. These pressure taps are located on the cross-tube between the lower hoist cylinder mounts. The pressure tap (M) checks the pressure of the cylinder lower circuit. The pressure tap (L) checks the pressure of the cylinder raise circuit.
L
M
MACHINE TOP VIEW - STEERING AND POWERTRAIN VIEW ALL CALLOUTS
18 47
25
57
60
34
54 37
53 46
26
35
52 1
15 51
55
49
33
50 48
43
41
CAB
56
34
30 38 44
45
31
42
39 40
32 36
61
STEERING SYSTEM VIEW VIEW ALL CALLOUTS
30
31
Shown in this visual is the 777F steering system tank. The tank is located on the right platform. The 777F steering tank functions the same as the the 777D steering tank.
Shown in this visual is the steering pump (31) for the 777F. The steering pump is mounted on the back of the C32 ACERT engine. The steering pump is a load sensing, pressure compensated, piston-type pump
Steering Disable Solenoid
Relief Valve
61 32
T
Shown in this visual is the steering valve (32) for the 777F. The 777F uses the same steering valve as the 777D. The steering valve is located in the same place however the steering valve is mounted differently. The pressure tap (T) checks the pressure in the supply line to the HMU. If the supply oil pressure to the HMU is below specification, the relief valve many need to be adjusted. The steering disable valve (61) is located behind the shock on the right frame rail. When the steering disable solenoid valve is energized, the flow from the steering to the steering valve is blocked by the steering disable valve (61).
Shown in the visual to the left is the electric secondary steering pump (35) on the 777F. The pump and motor are the same as the 777D however the location has changed. The pump and motor are now located on the front crossmember. The secondary pressure switch (36) is mounted next to the secondary steering pump. The pressure switch (36) detects if the wheels are being turned via the steering wheel when secondary steering is applied. When the wheel is turned in a secondary steering condition, the pressure switch (36) will signal the Transmission/Chassis ECM and the QuickEvac function will be disabled.
35
36
POWERTRAIN VIEW VIEW ALL CALLOUTS
42
X S•O•S
Shown in this visual is the 777F torque converter charging filter (42). The charging filter is located on the right frame rail, behind the right front tire. The S•O•S port is located on the torque converter filter. S•O•S Port draws a sample from the outlet of the filter.
Y
44
This view shows the torque converter lockup clutch filter. (X) is a pressure tap. The pressure indicated at tap (X) is pump pressure for the lockup clutch pilot circuit.
W
45
Z Shown in the left visual is the 777F transmission charge filters. The 777F has two filters mounted on the cross member on the right side of the machine. Port (Y) is an S•O•S port. The rear filter housing also has a bypass switch. The bypass switch provides an input signal to the Caterpillar Monitoring System, which informs the operator if t he filter is restricted.
53
52
51
50
Shown in the this visual is pressure tap (W) for the lockup clutch valve and pressure tap (V) for the outlet relief valve. The pressure indicated at tap (W) is the pressure in the lockup clutch. The pressure indicated at tap (Z) is the pressure inside the torque converter.
41
a
b
c
d
e
f
g
h
j
55
49
43
NOTE: The taps shown in this visual do not appear on the schematic.
Shown in the top visual is the new five section gear pump. The gear pump is a different design then the previous 777D. The gear pumps are for the following circuits: Torque converter scavenge (41) Torque converter charge (50) Lockup clutch valve pilot circuit (51) Transmission scavenge (52) Transmission charge (53) Shown in the lower visual are some of the torque converter system components for the 777F. The torque converter systems are similar between the 777D and 777F. The torque converter inlet relief valve (55) and the torque converter outlet relief valve (49) will function the same. The lockup clutch valve (43) on the 777F is now an ECPC valve.
Shown in this visual is the 777F ECPC transmission. This new transmission has pressure taps located on the outside of the transmission. This feature will aid in preventing contamination from entering the transmission as well as saving time when checking the pressures on the 777F transmission.
Lube oil pressure can be checked at tap (a). System pressure can be checked at tap (b). Clutch 6 pressure can be checked at tap (c). Clutch 5 pressure can be checked at tap (d). Clutch 7 pressure can be checked at tap (e).
Clutch 4 pressure can be checked at tap (f). Clutch 3 pressure can be checked at tap (g). Clutch 2 pressure can be checked at tap (h). Clutch 1 pressure can be checked at tap (j).