Bobcat 425 Mini Excavator Hydraulic Repair & Troubleshooting Schematic 425 S/N AACJ11001 AND ABOVE S/N A9K311001 AND ABOVE 428 S/N A9K411001 AND ABOVE

BUCKET CYLINDER
MAIN FILTER
WITH BY-
PASS
OIL COOLER
1
1
2
3
4
LH JOYSTICK
T
P
DIRECT TO
TANK VALVE
(EXCLUDED FOR
U.S. OPTION)
T
P
TRAVEL JOYSTICK
3
4
1
2
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
HYDRAULIC SCHEMATIC
425 S/N AACJ11001 AND ABOVE
S/N A9K311001 AND ABOVE
428 S/N A9K411001 AND ABOVE
(PRINTED MAY 2009)
V-0990
3
4
16
17
18
18
19
12
30
12
13
12
12
13
12
13
12
13
MALE
(RETURN)
FEMALE
(PRESSURE)
T3
14
SLEW LOCK VALVE
(S/N A9K311312 & Above) ONLY
& (S/N A9K411311 & Above) ONLY
J1
J2
A
B
B1
A1
43
1 of 4
Dealer Copy -- Not for Resale
CENTER
SWIVEL
JOINT
CASE DRAIN
FILTER
RESERVOIR
PRESSURIZED BREATHER
HYDRAULIC PUMP
BLADE
CYLINDER
F
G
E
C
D
H
A
B
MAIN FILTER
WITH BY
-PASS
T
P
C
A
D
B
H
E
F
G
T
P
PILOT
MANIFOLD
P
T1
P1
1
2
3
5
6
22
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
2 of 4
Dealer Copy -- Not for Resale
BOOM CYLINDER
ARM CYLINDER
ISO/STD
CONVERTER
(ISO SHOWN)
1
2
3
4
RH JOYSTICK
3
4
T
P
OFFSET CYLINDER
LOCKING
VALVE
R1
L
3 I
SO
L3
R1 ISO
L
1 I
SO
L1
R3
I
SO
R3
BACK
FRONT
STD
I
SO
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
7
8
10
20
36
12
13
12
13
12
13
T
T1
11
21
14
3 of 4
Dealer Copy -- Not for Resale
T
P
P
T1
G
ACC
P
1
T
B
B1
A
C
D
AUX BASE
AUX ROD
2-SPD
J-STK
V-0990 (5-6-09)
22
23
24
25
26
28
29
27
37
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
35
P
P1
LS
T
HYDRAULIC X-CHANGE
(OPTIONAL)
38
39
40
41
42
4 of 4
Dealer Copy -- Not for Resale
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