cargador 99h

1. RENR8828
Preliminary
16
Page,
PRELIMINARY
PRELIMINARY
PRELIMINARY
RENR8828
November 2005
966H AND 972H WHEEL LOADER
Hydraulic System
966H:
A6D1-UP
A6G1-UP
972H:
A7D1-UP
A7G1-UP
©2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
NOTICE:
THIS IS A TEMPORARY DOCUMENT THAT WILL BE REPLACED
BY FORMAL SERVICE INFORMATION AT A LATER DATE.
The following remote pressure taps are located inside the panel on the
front side of the service center:
- Transmission reverse clutch (1)
- Transmission forward clutch (2)
- Transmission fourth speed clutch (3)
- Transmission third speed clutch (4)
- Transmission second speed clutch (5)
- Transmission first speed clutch (6)
- Steering pump outlet pressure (7)
- Torque converter inlet pressure (8)
- Brake system accumulator pressure (9)
- Transmission lubrication pressure (10)
- Transmission pump outlet pressure (11)
- Torque converter outlet pressure (12)
- Steering cylinder rod end grease zerks (13)
- Rear axle oscillation bearing grease zerks (14)
ONE POSITION TWO POSITION THREE POSITION
VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO-WAY THREE-WAY FOUR-WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN AUX.
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE 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 PEDAL
GENERAL 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 CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED COMPLETE INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID SERVO THERMAL DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
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 Color
Circuit Number
Identification
B A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Item
Number
Description
Part
Number
Schematic
Location
1 HAND METERING UNIT 230-4176 B-4
2 CONNECTOR - ORIFICE 108-2144 C-4
3 CYLINDER GP - STEER 133-1747 C-1
4 VALVE GP - NEUTRALIZER 146-7571 C-3, C-4
5 VALVE GP - STEER 142-3996 D-1
6 VALVE GP - NEUTRALIZER 8J-1553 E-2
7 VALVE GP - STEER 133-1728 F-1
8 CYLINDER GP - STEERING 133-1747 F-1, F-2
9 VALVE GP - CHECK 111-7775 E-3
10 VALVE GP - PILOT 164-4116 E-4
11 VALVE GP - SHUTTLE 8J-6875 E-3
12 SCREEN GP 154-2883 F-2
13 PUMP GP - STEERING 241-9157 A-6
14 PUMP GP - IMPLEMENT 254-4109 B-7
15 CYLINDER - TILT (STANDARD - 966) 242-4273 F-8
16 CYLINDER - TILT (STANDARD - 972) 244-8777 F-8
17 CYLINDER - TILT (HIGH LIFT - 966) 245-7484 F-8
18 CYLINDER - TILT (HIGH LIFT- 972) 245-7486 F-8
19 CYLINDER - LOGGER - 966 244-8777 F-8
20 CYLINDER - LIFT (LH) 242-4275 F-7
21 CYLINDER - LIFT (RH) 242-4274 F-7
22 VALVE 152-2646 D-9
23 VALVE GP - MANUAL 112-1817 E-9
24 ACCUMULATOR - PILOT 245-2975 F-5
25 PUMP GP - FAN 254-5147 B-8
26 MOTOR GP - FAN 161-8919 C-9
27 VALVE GP - COOLER BYPASS 142-8977 B-9
28 FILTER GP 244-1031 B-9
29 VALVE GP - FLOW DIVERTER 237-8180 A-9
30 FAN CONTROL-BRAKE CHARGE VALVE 242-1307 C-8
31 CASE DRAIN FILTER 249-2334 A-8
32 VALVE GP - BREAKER RELIEF 220-0814 A-8
33 TANK GP 237-2742 A-8
34 VALVE GP - DIVERTER 141-2597 B-5
35 PUMP GP - SUPP STEER 275-8543 A-5
36 VALVE GP - CONTROL 261-3945 D-9
37 VALVE GP - CONTROL 261-2337 D-9
38 VALVE GP - CONTROL 261-3972 D-9
39 VALVE GP - CONTROL 261-2338 D-9
40 VALVE GP - CONTROL 256-3644 D-9
41 ACCUMULATOR-RIDE CONTROL 245-2974 F-6
42 VALVE GP - CONTROL & RELIEF 263-5832 C-7
43 MOTOR GP 183-4077 C-6
Component Locations
COMMAND CONTROL STEERING CIRCUIT
HMU STEERING CIRCUIT
MAIN SCHEMATIC
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA FAN PUMP PRESSURE A-9
BB TRUE LOAD SENSING E-9
CC SYSTEM PRESSURE PUMP E-9
DD LOAD SENSE PRESSURE B-7
EE STEERING SYSTEM PRESSURE B-7
FF STEERING LOAD SENSE B-4, D-4
HH HYDRAULIC FAN MOTOR PRESSURE B-8
JJ FAN PUMP LOAD SENSE B-9
The implement pump is a variable displacement piston pump. The pump
control valve (1) controls the angle of the swash plate (not shown). The
implement pump supplies oil flow for the implement hydraulic system,
the implement pilot system, and the optional CCS pilot system.
Maximum angle stop adjustment screw (2) is used to adjust the maximum
upstroke position of the actuator piston in the pump control valve (1).
1 2
1 2
3
4
5
6
7 8 9
10 11 12
13
14
This photo shows a front view of the implement control valve in the loader frame. The
following components can be seen in this view:
- Pressure differential relief valve (1)
- Head end solenoid valve (ride control) (2)
- Signal relief valve (3)
- Tilt anti-drift valve (4)
- Rod end solenoid valve (ride control) (5)
- Ride control balance solenoid valve (6)
- Pilot pressure reducing valve (7)
- Pilot accumulator (8)
- Pilot supply pressure tap (9)
- Lift cylinder head end pressure tap (10)
- Lift cylinder head end pressure sensor for Payload Control System
and Autodig (10)
- Hydraulic lockout solenoid valve (12)
11
10
9
1 2 3
4
5
6
12
8
7
The following components are located on the fan control and brake accumulator charging valve:
- Signal line to the fan and brake pump (1)
- Fan solenoid valve, an electronic output of the Engine ECM which controls the speed
of the cooling fan (2)
- Relief valve, limits the maximum pressure in the brake system (3)
- Cut-in valve, maintains minimum brake accumulator pressure (4)
- Return hose to the hydraulic tank (5)
- Cut-out valve, maintains maximum brake accumulator pressure (6)
- Brake pressure switch, warns the operator when brake accumulator pressure is low (7)
- Inverse shuttle valve, maintains equal charge pressure in both accumulators (8)
- Accumulator ports (9)
- Pump inlet port (10)
- Fan motor outlet port (11)
- Priority valve, blocks flow to the fan motor when the brake accumulators are
charging (12)
1
2
3
4 5
6
7
8
9
10
11
12
The following components can be seen from
the left rear of the control valve:
- Tilt anti-drift valve (1)
- Signal relief valve (2)
- Signal duplication valve (3)
- Return to tank port (4)
- Supply port from pump (5)
- Signal line to pump (6)
- Tank line (7)
- Screen (8)
- Tilt back pilot solenoid valve (9)
- Tilt back pilot (10)
- Tilt cylinder rod end line relief (11)
- Ride control balance solenoid valve (12)
- Rod end solenoid valve (ride control) (13)
1 2
3
4
5
6
7
8
9
10
11
12
13
The following components are located on the
right side of the implement control valve:
- Tilt cylinder rod end line relief (1)
- Lift anti-drift valve (2)
- Line to manual lower valve (3)
- Tank line (4)
- Ride control relief valve (5)
- Line to ride control accumulator (6)
- Raise pilot solenoid valve (7)
- Dump pilot solenoid valve (8)
1 2 3 4
5
6
7
8

2. RENR8828
Preliminary
30
Page,
Color
2
PRELIMINARY
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT PUMP OUTPUT
PRIMARY STEERING PUMP CIRCUIT
STEERING CIRCUIT
IMPLEMENT PILOT SUPPLY OIL
AUXILIARY CIRCUIT
LOAD SENSING
SUPPLY LINE
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
SECONDARY STEERING CIRCUIT
BRAKE CHARGE VALVE AND FAN CONTROL CIRCUIT
A
B
C
D
E
F
A
B
C
D
E
F
2
3
4
5
6
7
8 2
3
4
5
6
7
8 1
2
3
4
5
6
7
8 2
3
4
5
6
7
8 1
1
A
C
D
E
F
B
C
D
E
F
B
9
9
Connection b1 only for Command Control Steering
THIS IS A TEMPORARY DOCUMENT THAT WILL BE REPLACED BY FORMAL SERVICE INFORMATION AT A LATER DATE.
6
9
3
HMU STEER AND 3PC IMPLEMENT
COMMAND CONTROL STEERING
AND 3PC IMPLEMENT ATTACHMENT
a1
a1
b1
b1
c1
c1
c1
d1
d1
d1
e1
4
2
e1
e1
CROSSOVER
RELIEF
SHUTTLE VLV
DIRECTIONAL SPOOL
MAKE UP
CHECK
BACK UP
RELIEF
PRESSURE
REDUCING
VALVE
PILOT PORT"A"
PILOT PORT"B"
REGULATED
PRESS. PORT
TO PILOT VALVE
TANK PORT
CYL PORT "A"
CYL PORT "B"
LOAD SENSING
PUMP PORT
8
8
7
12
10
11
34
35
B4 A4
CROSSOVER RELIEF
CYL PORT "A"
CYL PORT "B"
MAKE-UP CHECKS
DIRECTIONAL SPOOL
BACK-UP RELIEF
PUMP PORT
HMU SUPPLY PORT
PILOT PORT "B"
PILOT PORT "A"
PILOT CONTROL SPOOL
TILT
RACK
BACK
DUMP
RACK
BACK
HOLD
DUMP
LIFT
RAISE
LOWER/
FLOAT
RAISE
HOLD
LOWER
FLOAT
HOLD
HEAD
END
ROD
END
AUX
HEAD
END
ROD
END
LS DR
1
)(
R H
LS P T
F
PS
A1 A2
5
4
1
33
31
32
13
30
26
27
28
36
25
15 20 21
41
24
23
37 38
29
22
16
17
18
39
P
T
43
42
40
14
THIS SCHEMATIC IS FOR THE 966H AND 972H WHEEL LOADER
PART #: 242-0337 CHG 07
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
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
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
AA
CC
BB
DD
EE
FF
FF
GG
HH
JJ
19