Bobcat 331 Mini Excavator Hydraulic Repair & Troubleshooting Schematic (S/N 232512783 AND ABOVE) 331E (S/N 232711434 AND ABOVE) 334 (S/N 232612158 AND ABOVE)

Q1
Q2
T1,T2
PS
BOOM SWING
CYLINDER
BOOM CYLINDER
SWIVEL JOINT
E
B
D
A
C
H
F
G
ARM CYLINDER
EXTENDIBLE
ARM CYLINDER
P2
P1
TRAVEL MOTOR
331E ONLY
HYDRAULIC/HYDROSTATIC SCHEMATIC
331 (S/N 232512783 AND ABOVE)
331E (S/N 232711434 AND ABOVE)
334 (S/N 232612158 AND ABOVE)
(PRINTED AUGUST 2002)
V-0200
10
23
12
1 of 6
Dealer Copy -- Not for Resale
BOOM CYLINDER
R
V1
V2
ARM
BOOM SWING
RH TRAVEL
BOOM
LH TRAVEL
b
A
B
A
B
B
A
a
B
A
b
a
A
B
P1
P2
G
ARM CYLINDER
PB
EXTENDIBLE
ARM CYLINDER
G
23
33
29
19
13
14
18
17
27
12
2 of 6
Dealer Copy -- Not for Resale
1
2
3
4
T
LH JOYSTICK
P
1
2
3
4
T
RH JOYSTICK
P
L
1 I
SO
L3
ISO
R
1
ISO
ISO/STD CONVERTER
(ISO SHOWN)
L1
L
3
R
3
IS
O
R1
R
3
BACK
FRONT
S
TD
ISO
C
P1
P2
B
A
PSI
A3
A2
A1
S1
V1
V2
G
PB
G1
RIGHT FRONT
REAR
LEFT
RIGHT FRONT
REAR
LEFT
21
20
32
27
3 of 6
Dealer Copy -- Not for Resale
Q1
Q2
T1,T2
PS
BUCKET CYLINDER
BLADE CYLINDER
SWIVEL JOINT
TOP
SWING MOTOR
BOTTOM
FEMALE (PRESSURE)
INTERSECTION OF HYDRAULIC LINES
INDICATED BY JUNCTION DOT
PUMP SUPPLY
WORKING CIRCUITS
PILOT PRESSURE
SYSTEM RETURN LINES
ENCLOSURE
DIRECT TANK RETURN
DIRECT TO
TANK VALVE
(
EXCLUDE FOR
U.S. OPTION)
MALE (RETURN)
EXTENDIBLE
ARM CYLINDER
P2
P1
TRAVEL MOTOR
Printed in USA
11
24
8
8
5
4 of 6
Dealer Copy -- Not for Resale
BUCKET CYLINDER
COOLER
V1
V2
V3
TOP
SWING MOTOR
BOTTOM
AUX
BOOST
SWING
BUCKET
T1
B
b
a
A
B
b
a
A
B
A
B
b
a
A
B
B
A
b
a
P3
T2
BLADE
PB
DIRECT TO
TANK VALVE
EXCLUDE FOR
OPTION
)
X
X
EXTENDIBLE
ARM CYLINDER
17
15
16
36
35
34
22
25
28
31
5
30
5 of 6
Dealer Copy -- Not for Resale
COOLER
P2
P3
V1
V2
V3
T
PB
T1
F
HYDRAULIC PUMP
V-0200 (8/8/02)
25
28
6
7
4
3
26
9
2
1
6 of 6
Dealer Copy -- Not for Resale
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