1. INTERACTIVE SCHEMATIC
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Information
Schematic
Machine Views
Component Table
Tap Table
Fluid Power Symbols
Electrical Symbols
Front Frame
Rear Frame
Tap Views
Features
Options
Bookmarks X
EC-C3
EC-C2 E-C60
EC-C1
E-C61
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3. COMPONENTS AND TAPS (Volume 1)
Tap
Number
Description
Schematic
Location
4
-
E
e
r
u
s
s
e
r
P
e
g
r
a
h
C
7
P
4
-
D
l
l
i
F
e
g
r
a
h
C
8
P
3
-
E
Gauge
S
O
S
x
o
b
r
a
e
G
9
P
3
-
D
e
r
u
s
s
e
r
P
e
v
i
r
D
d
r
a
w
r
o
F
t
a
t
s
y
H
0
1
P
2
-
C
e
r
u
s
s
e
r
P
e
v
i
r
D
e
s
r
e
v
e
R
t
a
t
s
y
H
1
1
P
4
-
B
Gauge
S
O
S
c
i
l
u
a
r
d
y
H
2
1
P
3
-
E
e
r
u
s
s
e
r
P
x
o
b
r
a
e
G
3
1
P
3
-
E
e
r
u
s
s
e
r
P
e
b
u
L
4
1
P
2
-
E
e
r
u
s
s
e
r
P
h
c
t
u
l
C
5
1
P
8
-
E
e
r
u
s
s
e
r
P
e
k
a
r
B
e
c
i
v
r
e
S
t
n
o
r
F
6
1
P
8
-
E
e
r
u
s
s
e
r
P
e
k
a
r
B
e
c
i
v
r
e
S
r
a
e
R
7
1
P
Tap Location
Pressure and Sampling
Volume 1
Description
Part
Number
Machine
Location
Schematic
Location
8
,
7
-
E
1
7
0
2
9
-
0
6
3
e
k
a
r
B
-
p
G
r
o
t
a
l
u
m
u
c
c
A
6
-
E
2
3
5
9
6
-
3
7
3
e
g
r
a
h
C
-
p
G
r
o
t
a
l
u
m
u
c
c
A
4
-
C
7
7
5
3
0
-
2
5
3
l
i
O
c
i
l
u
a
r
d
y
H
-
p
G
r
e
l
o
o
C
3
-
E
4
1
7
6
6
3
-
9
4
3
x
o
b
r
a
e
G
-
p
G
r
e
t
l
i
F
4
-
E
5
1
4
5
7
0
-
8
6
3
x
o
b
r
a
e
G
-
p
G
r
e
t
l
i
F
8
,
7
-
E
6
1
9
8
0
9
-
9
4
3
r
o
t
a
l
u
m
u
c
c
A
e
k
a
r
B
-
p
G
d
l
o
f
i
n
a
M
5
-
E
7
1
5
8
7
0
-
7
4
3
e
v
l
a
V
k
c
o
l
r
e
t
n
I
t
a
t
s
y
H
-
p
G
d
l
o
f
i
n
a
M
3
-
D
8
1
7
0
7
1
-
5
4
3
p
o
o
L
t
a
t
s
y
H
-
p
G
d
l
o
f
i
n
a
M
3
-
C
1
2
7
7
0
3
-
7
0
3
)
c
c
5
1
1
(
t
a
t
s
y
H
-
p
G
r
o
t
o
M
1
-
C
2
2
2
8
0
3
-
7
0
3
)
c
c
2
5
1
(
t
a
t
s
y
H
-
p
G
r
o
t
o
M
8
-
C
3
2
3
9
3
6
-
9
8
2
n
a
F
c
i
l
u
a
r
d
y
H
/
r
o
t
a
i
d
a
R
-
p
G
r
o
t
o
M
Motor Gp - Radiator/Hydraulic Fan (Reversing) 289-6394 24 C-8
2
-
D
5
2
4
1
6
2
-
X
9
r
o
t
c
e
n
n
o
C
g
n
i
h
s
u
l
F
r
o
t
o
M
-
p
G
e
c
i
f
i
r
O
8
-
E
7
2
7
5
1
0
-
2
4
3
e
k
a
r
B
-
p
G
l
a
d
e
P
4
-
D
8
2
9
7
0
3
-
7
0
3
e
b
u
L
-
p
G
p
m
u
P
Pump Gp - Fan/Brake (W/Brake Charging Valve) 341-7633 29 D-7,8
6
-
D
2
3
8
3
6
7
-
1
4
3
)
K
4
2
9
(
t
a
t
s
y
H
-
p
G
p
m
u
P
6
-
D
2
3
5
6
0
3
-
7
0
3
)
K
0
3
9
(
t
a
t
s
y
H
-
p
G
p
m
u
P
8
-
E
5
3
1
9
3
7
-
4
4
3
)
e
g
r
a
h
C
e
k
a
r
B
(
e
r
u
s
s
e
r
P
-
p
G
r
o
s
n
e
S
6
-
D
,
E
6
3
8
7
1
1
-
9
4
3
)
D
W
F
p
o
o
L
t
a
t
s
y
H
(
e
r
u
s
s
e
r
P
-
p
G
r
o
s
n
e
S
6
,
5
-
C
7
3
8
7
1
1
-
9
4
3
)
V
E
R
p
o
o
L
t
a
t
s
y
H
(
e
r
u
s
s
e
r
P
-
p
G
r
o
s
n
e
S
7
-
E
39
1
9
3
7
-
4
4
3
)
e
k
a
r
B
k
r
a
P
(
e
r
u
s
s
e
r
P
-
p
G
r
o
s
n
e
S
2
-
E
2
4
3
5
0
7
-
7
3
3
x
o
b
r
a
e
G
-
r
A
n
o
i
s
s
i
m
s
n
a
r
T
6
-
C
8
4
8
7
0
2
-
8
4
3
)
s
s
a
p
y
B
r
e
l
o
o
C
l
i
O
d
y
H
(
k
c
e
h
C
-
p
G
e
v
l
a
V
1
-
D
9
4
0
8
2
2
-
0
7
3
)
g
n
i
h
s
u
l
F
t
a
t
s
y
H
(
k
c
e
h
C
-
p
G
e
v
l
a
V
5
-
E
1
5
123-4750
Check (Pilot Supply)
-
p
G
e
v
l
a
V
Component Location Volume 1
7
-
E
8
5
7
7
3
0
-
7
5
3
e
k
a
r
B
k
r
a
P
-
p
G
e
v
l
a
V
4. COMPONENTS AND TAPS (Volume 2)
Tap
Number
Description
Schematic
Location
3
-
C
e
r
u
s
s
e
r
P
e
g
r
a
h
c
s
i
D
g
n
i
r
e
e
t
S
1
P
5
-
C
e
r
u
s
s
e
r
P
e
s
n
e
s
d
a
o
L
g
n
i
r
e
e
t
S
2
P
5
-
E
e
r
u
s
s
e
r
P
Discharge
t
n
e
m
e
l
p
m
I
3
P
6
-
C
e
r
u
s
s
e
r
P
e
s
n
e
s
d
a
o
L
t
n
e
m
e
l
p
m
I
4
P
5
-
E
e
r
u
s
s
e
r
P
t
o
l
i
P
t
n
e
m
e
l
p
m
I
5
P
5
-
D
e
r
u
s
s
e
r
P
r
e
l
p
u
o
C
k
c
i
u
Q
6
P
Tap Location
Pressure and Sampling
Volume 2
Description
Part
Number
Machine
Location
Schematic
Location
4
-
E
3
4
1
0
7
-
3
7
3
t
o
l
i
P
-
p
G
r
o
t
a
l
u
m
u
c
c
A
2
-
F
4
7
1
0
7
-
3
7
3
)
K
4
2
9
(
l
o
r
t
n
o
C
e
d
i
R
-
p
G
r
o
t
a
l
u
m
u
c
c
A
2
-
E
4
0
6
9
6
-
3
7
3
)
K
0
3
9
(
l
o
r
t
n
o
C
e
d
i
R
-
p
G
r
o
t
a
l
u
m
u
c
c
A
2
-
F
5
6
1
0
7
-
3
7
3
)
K
4
2
9
(
l
o
r
t
n
o
C
e
d
i
R
-
p
G
r
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t
a
l
u
m
u
c
c
A
2
-
E
5
2
6
9
6
-
3
7
3
)
K
0
3
9
(
l
o
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t
n
o
C
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d
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-
p
G
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a
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m
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c
c
A
4
-
B
6
9
2
8
2
-
8
5
2
k
n
a
T
c
i
l
u
a
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d
y
H
-
r
e
h
t
a
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B
6
-
D
8
4
2
7
0
-
5
7
3
r
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C
n
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F
-
p
G
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d
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C
5
-
D
9
5
7
3
9
-
3
5
3
r
e
l
p
u
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C
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d
i
W
-
p
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d
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C
3
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F
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3
1
5
8
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1
5
3
)
K
4
2
9
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9
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9
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3
3
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9
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2
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2
1
5
9
5
5
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9
3
3
g
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3
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3
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5
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9
3
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4
2
9
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C
7
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9
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2
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6
2
3
7
9
8
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6
6
3
C
P
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c
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2
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C
0
3
3
5
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0
3
g
n
i
r
e
t
e
M
d
n
a
H
-
p
G
p
m
u
P
Pump Gp - Hand Metering (W/Dual Mode Steering) 307-3081 31 C-2
7
-
B
3
3
0
6
6
7
-
1
4
3
)
K
4
2
9
(
p
m
u
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t
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e
m
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l
p
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I
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P
7
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3
3
4
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0
3
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0
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0
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9
(
p
m
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m
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l
p
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G
p
m
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P
Pump Gp - Secondary Steering (W/Integrated Relief) 307-3051 34 C-1
Sensor Gp - Pressure (Implement Pump Discharge) 344-7391 38 E-7
3
-
C
0
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1
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3
7
-
4
4
3
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Valve Gp - Check (Implement Backpressure) 352-1045 50 E-7
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Component Location Volume 2
5. FLUID POWER SYMBOLS
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
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
6. ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
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
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
T
7. Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 1 of 2: DRIVE CIRCUITS
SCHEMATIC PART NUMBER: 339-6678, CHANGE: 00, VERSION: -
SCHEMATIC PART NUMBER: 339-6677, CHANGE: 00, VERSION: -
THIS SCHEMATIC IS FOR THE 924K and 930K WHEEL LOADER HYDRAULIC SYSTEM
1
2
3
4
5
6
7
8
A
B
C
D
E
F
1
2
3
4
5
6
7
8
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
LUBE PUMP SUPPLY CIRCUIT
MAIN PUMP OUTPUT
LUBE PUMP CIRCUIT
AUXILIARY 1 CIRCUIT
LOAD SENSE CIRCUIT
STEERING CIRCUIT
FAN/BRAKE CHARGE PUMP
SUPPLY LINE
QUICK COUPLER CIRCUIT
BRAKE CIRCUIT
AUXILIARY 2 CIRCUIT
DRAIN / RETURN LINE
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
HYSTAT CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
P12
P11
P15
P14
P13
P9
P10
P8
P7
P16
P17
To
Brakes
M
A
T1
U
G
B
T1
T2
F
P
U L
T1
E
S
Ms
Mp
M
Secondary
Steer
Steering
Implement
Charge
Pump
Lube
Pump
Hystat
Pump
Sec.
Steering
Rear Drain
Manifold
Front
Manifold
HMU
Pilot
Drain
Dual
Mode
Steering
To
Imp
Pilot
T2
Hydraulic
Tank
To
Rear
Axle
To
Front
Axle
U
B
M1
G
A
M1
B1 B2
S2
S1
B
R
L
SW
T
P C
GP
P
EF
SOS
Y
Z
A1 A2
U
T
E
G
SA
1:1 Drive Ratio
307-3077
(21) MOTOR GP
307-3082
HYSTAT (152cc)
345-1707
(18) MANIFOLD GP
HYSTAT LOOP
345-1707
(18) MANIFOLD GP
HYSTAT LOOP
348-2078
(48) VALVE GP - CHECK
HYD OIL COOLER BYPASS
349-1178
(37) SENSOR GP - PRESSURE
HYSTAT LOOP (REVERSE)
352-0357
(7) COOLER GP
HYDRAULIC OIL
9X-2614
MOTOR FLUSHING
370-2280
(49) VALVE GP-CHECK
HYSTAT FLUSHING
337-7053
(42) TRANSMISSION AR
GEARBOX
307-3079
(28) PUMP GP
CHARGE & LUBE
368-0754
(15) FILTER GP-OIL
HYD OIL
349-3667
(14) FILTER GP-O (BSC)
GEARBOX
366-8955
(62) VALVE GP-SOLENOID
HYSTAT INTERLOCK
123-4750
(51) VALVE-CHECK
PILOT SUPPLY
347-0785
(17) MANIFOLD GP
HYSTAT INTERLOCK
341-7638 - (924K)
(32) PUMP GP - HYSTAT PUMP
349-1178
(36) SENSOR GP-PRESS
HYSTAT LOOP (FORWARD)
373-6953
(2) ACCUMULATOR GP
CHARGE ACCUMULATOR
341-7633
(29) PUMP GP - FAN/BRAKE
(W/ BRAKE CHARGING VALVE)
344-7391
(39) SENSOR GP-PRESS
PARK BRAKE
357-0377
(58) VALVE GP
PARK BRAKE
360-9207
(1) ACCUMULATOR GP
BRAKE ACCUMULATOR
342-0157
(27) PEDAL GP-BRAKE
349-9089
(16) MANIFOLD GP
BRAKE ACCUMULATOR
344-7391
(35) SENSOR GP - PRESSURE
BRAKE CHARGE
289-6393
(23) MOTOR GP
RADIATOR/HYDRAULIC FAN
289-6394
(24) MOTOR GP
RADIATOR/HYDRAULIC FAN (REVERSING)
HYSTAT (115cc)
(25) ORIFICE GP
(22) MOTOR GP
307-3065 - (930K)
8. Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 2 of 2: IMPLEMENT CIRCUITS
SCHEMATIC PART NUMBER: 339-6678, CHANGE: 00, VERSION: -
SCHEMATIC PART NUMBER: 339-6677, CHANGE: 00, VERSION: -
THIS SCHEMATIC IS FOR THE 924K and 930K WHEEL LOADER HYDRAULIC SYSTEM
1
2
3
4
5
6
7
8
A
B
C
D
E
F
1
2
3
4
5
6
7
8
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
LUBE PUMP SUPPLY CIRCUIT
MAIN PUMP OUTPUT
LUBE PUMP CIRCUIT
AUXILIARY 1 CURCUIT
LOAD SENSE CIRCUIT
STEERING CIRCUIT
FAN/BRAKE CHARGE PUMP
SUPPLY LINE
QUICK COUPLER CIRCUIT
BRAKE CIRCUIT
DIFFERENTIAL LOCK CIRCUIT
AUXILIARY 2 CURCUIT
DRAIN / RETURN LINE
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
HYSTAT CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
P6
P3
P5
P1
P2
P4
M
L1
S1 L4 L3
S2
Lube
Pump
Charge
Pump
P
H
R
T S
Hystat
Pump
M
Tilt Cylinder
Fan Motor
Return
Cooler
Return
Cooler
Bypass
Fan/Brake
Suction
To
Gear
Box
From Gear Box
Park Brake
Valve
TP LS PP
C1 C2
To
Pp
P
CS
RCS
Lx
Ls
A A
B B B
Tilt Lift
Aux
1
T
C1
C2
LS
P
Lift
Cylinders
L2
T
C2
C1
P
LP RP
D
S
B
B1 B2
B1 B2
S2
T
P T
C
From
Hystat
Interlock
Valve
To
Charge
Circuit
R
E
A
B
A
Aux
Tg
Steering Pump
Implement Pump
X2
PG
X1
PPG
GP
Fan Motor
Case Drain
Brake Pedal
Valve
1:1 Drive Ratio
2
373-7017 - (924K)
373-6960 - (930K)
(4) ACCUMULATOR GP
373-7016 - (924K)
373-6962 - (930K)
(5) ACCUMULATOR GP
RIDE CONTROL
353-9375
(9) CYLINDER GP
WIDE COUPLER
375-0724
(8) CYL GP
FUSION
COUPLER
352-1108
(59) VALVE GP
QUICK
COUPLER
192-2684
(54) VALVE-CHECK
STEERING
BACKPRESSURE
6V-7238
(61) VALVE-SHUTOFF
PETCOCK VALVE
347-8096
(19) MANIFOLD GP
REAR FRAME RETURN
352-1045
(50) VALVE GP - CHECK
IMPLEMENT
BACK PRESSURE
344-7391
(38) SENSOR GP - PRESSURE
IMPLEMENT PUMP
DISCHARGE
233-7133
(56) VALVE GP
DIFFERENTIAL LOCK
343-3047 - (924K)
(44) VALVE GP - BANK 2
IMPLEMENT
343-3049 - (924K)
(45) VALVE GP - BANK 3
IMPLEMENT
343-3051 - (924K)
343-3048 - (930K)
343-3050 - (930K)
343-3052 - (930K)
(46) VALVE GP - BANK 4
IMPLEMENT
341-7660 - (924K)
307-3044 - (930K)
(33) PUMP GP- IMPLEMENT
349-8199
(41) TANK GP
HYDRAULIC TANK
258-2829
(6) BREATHER
HYDRAULIC TANK
247-4503
(57) VALVE GP
DUAL MODE
STEERING
344-7391
(40) SENSOR GP - PRESS
PRIMARY STEERING
175-0447
(55) VALVE AS - CHECK
STEERING INLET
9T-1013
(53) VALVE GP - CHECK
SECONDARY
STEERING
346-5095
(20) MANIFOLD GP
STEERING
349-7843
(43) TUBE AS
FRONT FRAME
RETURN MANIFOLD
339-5595
(12) CYLINDER GP
STEERING
366-8973
(26) ORIFICE GP
RIDE CONTROL PC
280-9978
(60) VALVE GP
RIDE CONTROL
RIDE CONTROL
9T-1013
(52) VALVE GP - CHECK
RIDE CONTROL SUPPLY
339-5590 - (924K)
(11) CYL GP - LIFT
339-5592 - (924K)
339-5594 - (930K)
(13) CYL GP - TILT
373-7014
(3) ACCUMULATOR GP
PILOT
112-1817
(47) VALVE GP - BALL
DEAD ENGINE LOWER
351-8513 - (924K)
351-8514 - (930K)
(10) CYL GP - HIGH LIFT TILT
307-3053
(30) PUMP GP
HAND METERING UNIT
307-3081
(31) PUMP GP
HAND METERING UNIT
(W/DUAL MODE STEERING)
307-3051
(34) PUMP GP
SECONDARY STEERING
(W/ INTEGRATED RELIEF)
339-5593 - (930K)
