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RENR9126
30Page,TRM
RENR9126
March 2005
M318C Wheeled Material Handler
Hydraulic SystemM322C Wheeled Material Handler
©2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
M318C MH:
BEB2001-UP
H2G1-UP
M322C MH:
H2F1-UP
BDY2001-UP
8
8
23
5 6
84810 11
50
7
21
2 35 19
30
24
22
32
33
44
20
27
9
46
15
26
25
28 29
18
4
16
13
17
12
49
39
1
40
3 14
41 47
31 34
43
36
45
38 42
40
31
41
34 39
47
43
36
45
38 42
15
26
25
28 2949
4
16
13
17
122044
46
9
9
18
27
41
19
35
33
10
10
11
2
48
37
6
32
31 14
5 30
723
50 21
24
22
37
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 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
FIXED
DISPLACEMENT
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
SOLENOID SERVO 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
SHUTTLE PILOT
CONTROLLED
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)
A3
B1
M3
MA
26
40
4731
32
41
S2
S1
MP
M2
M6
P2
MLS
M5
P1
MM
M1
Mb
Ma
28
Tap Locations
Pressure, Sampling, and Sensor
Tap
NumberDescription
Schematic
Location
A3 Swing Brake Press C-11
B1 Brake Pressure C-8
LL Clutch Release I-9
M1 Main Pump Destroking Press A-6
M2 Pilot C-6
M3 Parking Brake Pressure Reserve B-9
M5 Prop Main Pump C-6
M6 Prop Swing Pump C-6
MA Quick Coupler Control Valve G-7
Ma Swing Pump Op Press A A-4
Mb Swing Pump Op Press B B-4
MLS Load Sense C-6
MM Joystick Steering C-6
MP Main Pump C-6
P1 Priority Steering Valve C-6
P2 Pump - Fan Drive C-6
S1 Accumulator Service Brake (1st Brake) B-8
S2 Accumulator Service Brake (2nd Brake) B-7
Main & Swing Pumps
Machine Component Locations
Brake Control Valve
Pressure Tap Panel
Quick Coupler Valve
Pilot Manifold
Description
Part
Number
Part
NumberSchematic
Location
Machine
LocationM318C M322C
Accumulator As - Brake 5W-9971 5W-9971 1 B-7, B-8
Accumulator As - OSC Axle 8U-2924 8U-2924 2 I-7
Accumulator As - Pilot 8U-6159 8U-6159 3 B-10
Cap - Breather 194-7849 194-7849 4 A-12
Control Gp - Hydraulic (LH) 243-4044 243-4044 5 E-11, F-11
Control Gp - Hydraulic (RH) CNU 243-4043 243-4043 6 E-10, F-10
Control Gp - Hydraulic Hand (Doz/Stab) 193-7789 193-7789 7 E-12
Cylinder Gp - Axle Lock 8U-4461 8U-4461 8 H-7, I-7
Cylinder Gp - Dozer Blade 252-7300 252-7300 9 H-11, I-11
Cylinder Gp - Stabilizer 224-9320 224-9320 10 H-6, I-6
Cylinder Gp - Steering 5W-5696 5W-5696 11 I-7
Filter Gp - Fan Circuit 227-6000 227-6000 12 C-4
Filter Gp - Main Return 193-5975 193-5975 13 A-3
Filter Gp - Oil (Pilot Circuit) 145-7750 145-7750 14 C-8
Filter Gp - Oil (Swing Circuit Make-Up) 109-7288 109-7288 15 B-5
Filter Gp - Swing Pump Drain 8U-0198 8U-0198 16 A-6
Filter Gp - Travel Motor Drain 8U-0198 8U-0198 17 A-3
Motor Gp - Gear (Fan Drive) 197-4602 197-4602 18 C-4
Motor Gp - Swing 152-7371 152-7371 19 B-4
Motor Gp - Travel 225-8180 225-8180 20 A-8
Pedal Gp - (Pilot Control) 112-5704 112-5704 21 E-10
Pedal Gp - (Pilot Control) 237-2261 237-2261 22 E-11
Pedal Gp - (Pilot Control) Note A 254-2684 254-2684 23 E-10
Pedal Gp - (Travel Valve) Note B 254-2685 254-2685 24 E-10
Pump Gp - Gear (Fan Drive) 196-8428 196-8428 25 B-4
Pump Gp - Main 240-0145 240-0143 26 A-6
Pump Gp - Pilot, Steering, Brake, Aux 196-8424 196-8424 27 B-6
Pump Gp - Swing 190-8199 196-8429 28 A-5
Solenoid As - Pump Margin Pressure 216-1397 216-1397 29 B-6
Valve As - Priority (Steering) 188-1814 188-1814 30 D-8
Valve Gp - Solenoid (Travel Lockout) 240-6325 240-6325 31 B-12
Valve Gp - Brake Control (Travel) 176-7800 176-7800 32 B-8
Valve Gp - Check (Boom) 202-4095 202-4095 33 G-6
Valve Gp - Check (End Cover) 239-7774 239-7774 34 C-9
Valve Gp - Check (Offset Boom) 202-4096 202-4096 35 G-8
Valve Gp - Check (Stick) 202-4092 202-4092 36 F-5
Valve Gp - Check (VA Boom) 238-7021 238-7021 37 G-7
Valve Gp - Combination 191-2778 191-2778 38 F-2
Valve Gp - Control (Joystick Boom Steering) 239-7775 239-7775 39 C-9
Valve Gp - Control (Medium Press) 239-7773 239-7773 40 B-9
Valve Gp - Control (Quick Coupler) 176-9667 176-9667 41 G-7
Valve Gp - Control (Variable Adjusting) 192-3183 192-3183 42 E-7
Valve Gp - Main Control 208-5122 208-5122 43 D-5
Valve Gp - Pilot (Joystick Boom Steering) 242-9670 242-9670 44 E-9
Valve Gp - Selector & Flow Control 243-5227 243-5227 45 G-10
Valve Gp - Solenoid (Dozer Blade) 196-7544 196-7544 46 I-10
Valve Gp - Solenoid (Pilot Manifold) 235-0783 235-0783 47 B-10
Valve Gp - Solenoid (Stabilizer) 196-7543 196-7543 48 I-6
Valve Gp - Solenoid (Travel Start Control) 254-2683 254-2683 49 F-4
Valve Gp - Steering 205-6215 187-3774 50 E-8
Note A: w/o tempomat
Note B: w/ tempomat
Component Locations
RENR9126
30Page,Color2,TRM
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
MAIN PUMP OUTPUT
SWING PUMP OUTPUT
STEERING CONTROL CIRCUIT
BRAKE PILOT STEERING PUMP OUTPUT
MATERIAL HANDLER CONTROL AND CYLINDER CIRCUIT
WHEEL BRAKE CONTROL CIRCUIT
MAIN CONTROL VALVE PILOT CIRCUIT
SUPPLY LINE
SHUT OFF VALVE CONTROL CIRCUIT
VA BOOM CONTROL CIRCUIT
FAN PUMP OUTPUT
TRAVEL VALVE CONTROL CIRCUIT
BOOM CONTROL CIRCUIT
STICK CONTROL CIRCUIT
DOZER BLADE / STABILIZER CONTROL CIRCUIT
SWING PUMP CONTROL CIRCUIT
BOOM AND BUCKET CONTROL CIRCUIT
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
A
B
C
D
E
F
G
H
I
A
B
C
D
E
F
G
H
I
12 11 10 9 8 7 6 5 4 3 2 1
12 11 10 9 8 7 6 5 4 3 2 1
nu
N
L
RH
LH
MCV
PU
T
VALVE GPSTEERING187-3774 (M322)205-6215 (M318)
MOTOR GP
(TRAVEL)
225-8180
MOTOR GP
SWING
152-7371
MOTOR GP
GEAR (FAN DRIVE)
197-4602
VALVE GP
MAIN CONTROL
197-9997 (M322C MH)
191-2762 (M318C MH)
PUMP GPMAIN240-0143 (322)240-0145 (318)
PUMP GPSWING196-8429 (M322C MH)190-8199 (M318C MH)
FILTER GP
MAIN RETURN
193-5975
b0 B0 A0VA BOOM
b5 BOOMP AUX 1 B5 A5 b4 B4 A4 b3DOZER/
STABI-
LIZER
L B3 A3STICK
A
B2 A2 b1 B1 A1TRAVEL BUCKETS51
B01 A01
PST
T
b01.2
A B
A1 B1GPST
T
M RL
P T
STICK IN
SW L SW R
STICK OUT
TP
DOWN
UP DOZER
STABILIZER
FWD
REV
TRAVEL
DEGU
OUT
INVA
BOOM
BOOM UP
BCT CL BCT OP
BOOM DOWN
P TTPTPTP
1212 1 32 4
P
PILOT
MANIFOLDT5
Z
P1
MG
m1
m2
K
P
B
K
B
PU
DSLSSABB
CLOSED WITH MPF
P T
STICK IN
SW L SW R
STICK OUT
1 32 4
P T
BOOM UPBCT CL BCT OP
1 32 4
BOOM DOWN
8
7
4
3
6
5
2
1PATTERN
CHANGER
V1 V2
C1 C2
MR X A T
B A
AMA B
T
P
XAT MR
BA
MR X A T
B A
A'XY
P
A
T
B
Z1
Z2
P T
MIN
MAX
MB
MA
G
X
T1
T2
S
B
A
GEL L
B KMK
MB
EK
EB
U
MS
T1/1 A5 M5
TRAVEL
MOTOR
CONTROL
A7 M7 A6 D6 M6
SWING
PUMP
CONTROL
MAIN
PUMP
CONTROL
TRAVEL
PILOT
CONTROL
A1A2A3A4
SWING
BRAKE
OSC
AXLE
REST
RESERVED
T1/2
SP
PST
M2 K
1IMPLEMENT
A8
DSLSSABBMG
m1
m2
K
B
PU
B
K
B
2
CLOSED WITH MPF
T5
Z
P1
PM3
A BFOR USE IF MACHINE
IS EQUIPPED WITH ONLY
ONE MEDIUM PRESSURE
FUNCTION
A B
T5
FLOW
CONTROL
CHECK
A2 B2 A1 B1 A3 B3
FOR USE IF MACHINE
IS EQUIPPED WITH
MORE THAN ONE
MEDIUM PRESSURE
FUNCTION
S2
S1
DS2
T
P
B1 B2
DS1
Qmax Qmin
S M1
A X ZG MXM
B
Ma
S
A
FA1FA FET2T1
RPS
Mb
Y2 Y3 Y1
X2X1 MHGFS
B
P
Z
R
T1
A
T2
N1N2N3
a01 b01
b01.1
T
PMP
S5a3 a2 a1
b2
a4S53 S52a5
IN OUT
K LS MLS LS AUX PMP P AUX 2a0
CFEF
P
LD
LD
TP
12
2
5643
1
2
5643
1
THIS HOSE ROUTING IS VALID
IF THE MACHINE IS EQUIPPED WITH A
JOYSTICK PATTERN CHANGER
GRAPPLE ROTATE
BUCKET ADJUST
HYDRAULIC CAB RISER OFFSET BOOM
TILT
VA BOOM QUICK COUPLER BOOM
1 32 4 12
P
FLOW
CONTROL VALVEPILOT
MANIFOLD
WHEEL BRAKE VALVE
ACCESS FROM GROUND
R2 T1 T2R1
SWING PUMP
SWING MOTOR
FAN DRIVE
S P
T
56
56
24
24 1
1
3
3
0
0
M1
BRAKE
PILOT
STEERING
PUMP MAIN PUMP
(IMPLEMENT,
TRAVEL, WORK TOOL)
a3 b3 a5 b5 SEE LOCB-7
b4 a4
A3
SEELOCD-3
SEE LOCB-5SEE LOC
D-5SEE LOC
F-6
SEE LOCB-5
SEELOCF-5
b3Y2
a01Y1
CONTROL GP
HYDRAULIC (RH) CNU
243-4043
b0 a0 b2 a2 a5 a1
SEELOCF-7
SEELOCD-7
SEELOCF-4
SEELOCD-4
SEE LOCD-6
SEE LOCD-3
b01
SEELOCD-2
b1
a3b5
M3
S1
B1
S2
SEE LOCF-4
B3
B3A3
A3 B3SEE LOC
F-9
A3
LL
b0
b0
SEE LOCF-7
SEE LOCF-10
MA
b5
b5
SEE LOCF-6 & C-10
SEE LOCF-6 & C-10
a5
M1
Ma
Mb
a01 b01
SEELOCF-11
SEELOCF-11
a1a2 SEE LOCF-10
SEE LOCF-10a3 SEE LOC
C10 & F-5
b3
a3
b2
SEE LOCC-10 &
D-5
b1 SEE LOCF-9
SEE LOCF-8
b4
SEE LOCF-12
SEE LOCF-11
SEE LOCF-10
SEE LOCF-11
SEE LOCF-10 a4
SEELOCF-6
SEELOCD-5F-5
Y2SEELOCF-11
SEELOCF-11
a0 SEE LOCF-10
Y1
MAIN PUMP
LOAD SENSE
MODE MAIN PUMP
MODE SWING PUMP
PILOT
AUX PUMP
FAN PUMP
JOYSTICK STEERING
MP
MLS
M2
M5
M6
P1
P2
MM
STEERING
CYLINDR
WHEEL
BRAKE
STABILIZER
OSC.
AXLE
LOCK
FWD
REV
CLUTCH
RELEASE
WHEEL
BRAKE
DOZER
BLADE
DEGU
MAIN CONTROL VALVE GP
VALVE GP
CONTROL (QUICK
COUPLER)
176-9667 OP
VALVE GP
CONTROL
(VARIABLE
ADJUSTING)
192-3183 OP
VALVE GP
CHECK (VA BOOM)
238-7021 OP
VALVE GP
CHECK (BOOM)
202-4095 OP
VALVE GP
CHECK (OFFSET BOOM)
202-4096 OP
CYLINDER GP
AXLE LOCK
8U-4461
CYLINDER GP
AXLE LOCK
8U-4461
CYLINDER GP
DOZER BLADE
252-7300
VALVE GP
SOLENOID
(DOZER BLADE)
196-7544 CYLINDER GP
STEERING
5W-5696
CYLINDER GP
STABILIZER
224-9320
VALVE GP
SOLENOID (STABILIZER)
196-7543 OP
TRAVEL MOTOR
SHUT OFF BALL VALVES
VALVE GP
COMBINATION
191-2778 OP
BUCKETSTICK
VALVE GP
SELECTOR &
FLOW CONTROL
243-5227 OPCONTROL GP
HYDRAULIC (LH)
243-4044
STICK &
SWING
PILOT
VALVE
BLADE &
STABILIZER
PILOT
VALVE
CONTROL GP
HYD HAND
(DOZ/STAB)
193-7789
CONTROL GP
HYD (LH)
243-4044
INSIDE
CAB
PEDAL GP
(PILOT
CONTROL)
237-2261 OP
PEDAL GP
(PILOT
CONTROL)
112-5704
OP
PEDAL GP
NOTE A
PILOT CONTROL
254-2684
NOTE B
TRAVEL VALVE
254-2685
CONTROL GP
HYD (RH)
CNU
243-4043
VALVE GP
PILOT
(JOYSTICK BOOM
STEERING)
242-9670 OP
VALVE AS
PRIORITY
(STEERING)
188-1814
STEERING
VALVE
FILTER GP
FAN CIRCUIT
227-6000
FILTER GP
OIL
(SWING CIRCUIT
MAKE-UP)
109-7288
SOLENOID AS
PUMP MARGIN
PRESSURE
216-1397
FILTER GP
OIL
(PILOT
CIRCUIT)
145-7750
VALVE GP
CONTROL
(JOYSTICK
BOOM
STEERING)
239-7775
OP
VALVE GP
CHECK
(END COVER)
239-7774 OP
VALVE GP
CONTROL
(MEDIUM
PRESS)
239-7773 OP
VALVE GP
SOLENOID
(PILOT MANIFOLD)
235-0783
ACCUMULATOR AS
PILOT
8U-6159VALVE GP
SOLENOID
(TRAVEL LOCK OUT)
240-6325
CAP
BREATHER
194-7849
FILTER GP
SWING PUMP DRAIN
8U-0198
PUMP GP
PILOT, STEERING,
BRAKE, AUX
196-8424
FAN
PUMPPUMP GP
GEAR
(FAN DRIVE)
196-8428
FILTER GP
TRAVEL MOTOR DRAIN
8U-0198
ACCUMULATOR AS
BRAKE
5W-9971
ENGINE
ACCUMULATOR AS
OSC AXLE
8U-2924
VALVE GP
CHECK
(STICK)
202-4092
VALVE GP
SOLENOID
(TRAVEL
START
CONTROL)
254-2683
VALVE GP
BRAKE
CONTROL
(TRAVEL)
176-7800
THIS SCHEMATIC IS FOR THE M318C MH & M322C MH
WHEELED EXCAVATOR
Part #: 253-4867 CHG00
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
NOTE A: PRFM REQ.: OP MARKED COMPONENTS
ARE OPTIONALAND NOT STANDARD.
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