Bobcat 425 Mini Excavator Hydraulic Repair & Troubleshooting Schematic S/N A1HW11001 AND ABOVE

BUCKET CYLINDER
DIRECT TO
TANK VALVE
(EXCLUDED FOR
U.S. OPTION)
SLEW MOTOR
A
B
A
B
A
B
BLADE
SLEW
a
b
A
B
A
B
TRVL RH
a
b
TRVL LH
a
b
A
B
AUX.
a
b
A
B
P
425 HYDRAULIC SCHEMATIC
S/N A1HW11001 AND ABOVE
(PRINTED JULY 2007)
V-0855
16
17
18
18
19
12
30
12
13
12
12
13
12
13
12
13
MALE
(RETURN)
FEMALE
(PRESSURE)
T3
14
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Dealer Copy -- Not for Resale
CASE DRAIN
FILTER
RESERVOIR
PRESSURIZED BREATHER
HYDRAULIC PUMP
MAIN FILTER
WITH BY-PASS
OIL COOLER
1
1
2
3
4
LH JOYSTICK
T
P
T
P
TRAVEL JOYSTICK
3
4
1
2
PILOT
MANIFOLD
P
T1
P1
a
b
A
B
a
b
a
b
A
B
a
b
1
2
3
4
5
6
22
16
17
35
14
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Dealer Copy -- Not for Resale
CENTER
SWIVEL
JOINT
BLADE
CYLINDER
F
G
E
C
D
H
A
B
C
A
D
B
H
E
F
G
Q1
Q2
T2
PS
L.H. TRAVEL MOTOR
32
33
Q1
Q2
T1
PS
P2 P1
R.H. TRAVEL MOTOR
32
31
33
34
34
35
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Dealer Copy -- Not for Resale
BOOM CYLINDER
ARM CYLINDER
OFFSET CYLINDER
LOCKING
VALVE
M
LS3
LS2
P
BUCKET
a
b
A
B
A
B
OFFSET
BOOM
a
b
A
B
ARM
a
b
A
B
14
15
9
8
10
20
12
13
12
13
12
13
T
T1
11
21
14
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Dealer Copy -- Not for Resale
ISO/STD
CONVERTER
(ISO SHOWN)
1
2
3
4
RH JOYSTICK
3
4
T
P
P
T1
G
ACC
T
B
B1
A
C
D
AUX BASE
AUX ROD
2-SPD
J-STK
R1
L3
IS
O
L3
R1 I
S
O
L1
IS
O
L1
R3 I
SO
R3
BACK
FRONT
S
T
D
I
S
O
a
b
a
b
a
b
22
23
24
25
26
28
29
27
14
15
7
37
36
T1
14
P
P1
38
42
5 of 6
Dealer Copy -- Not for Resale
V-0855 (6-28-07)
25
27
P2 P1
32
31
INTERSECTION OF HYDRAULIC LINES
INDICATED BY JUNCTION DOT
PUMP SUPPLY
WORKING CIRCUITS
PILOT PRESSURE
SYSTEM RETURN LINES
ENCLOSURE
DIRECT TANK RETURN
LOAD SENSE
LS
T
HYDRAULIC X-CHANGE
(OPTIONAL)
39
40
41
42
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Dealer Copy -- Not for Resale
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