Bobcat 331 Mini Excavator Hydraulic Repair & Troubleshooting Schematic S/N 234313000 – 234316876 31E S/N 234412000 – 234413318 334 S/N 234513000 – 234515532

Q1
Q2
T1,T2
PS
Q1
Q2
T1,T2
PS
CENTER SWIVEL
JOINT
E
B
D
C
A
H
F
G
FEMALE
(PRESSURE)
MALE
(RETURN)
P2 P1
P2 P1
R.H. TRAVEL MOTOR
L.H. TRAVEL MOTOR
MLS3
LS2
P1
a
b
BUCKET
a
b
A
B
A
B
BLADE
SLEW
a
b
A
B
A
B
TRVL RH
a
b
TRVL LH
a
b
A
B
A
B
BOOM SWING
BOOM
a
b
A
B
ARM a
b
A
B
AUX 2
a
b
A
B
AUX 1
A
B
T3
T
P2
INTERSECTION OF HYDRAULIC LINES
INDICATED BY JUNCTION DOT
PUMP SUPPLY
WORKING CIRCUITS
PILOT PRESSURE
SYSTEM RETURN LINES
ENCLOSURE
DIRECT TANK RETURN
LOAD SENSE
BUCKET
CYLINDER
ARM
CYLINDER
EXTENDIBLE
ARM CYLINDER
(IF EQUIPPED)
BOOM
CYLINDER
BLADE CYLINDER
LOCKING
VALVE
BOOM SWING
CYLINDER
HYDRAULIC/HYDROSTATIC SCHEMATIC
331 S/N 234313000 - 234316876
331E S/N 234412000 – 234413318
334 S/N 234513000 - 234515532
(PRINTED MARCH 2007)
V-0633
6
5
6
5
32
19
18
17
20
16
31
21
22
23
24
25
26
27
28
29
30
33
37
37
39
38
35
36
35
36
35
36
35
36
35
36
35
36
35
36
35
36
35
35
40
41
1 of 2
Dealer Copy -- Not for Resale
1
2
3
4
T
LH JOYSTICK
P
1
2
3
4
T
RH JOYSTICK
P
L1 ISO
L
3
I
S
O
R
1
I
S
O
US OPTION
ISO/STD CONVERTER
(ISO SHOWN)
L1
L
3
R3
I
S
O
R1
R
3
BACK
FRONT
S
TD
ISO
B
T1
RIGHT FRONT
REAR
LEFT
RIGHT
FRONT
REAR
LEFT
MAIN FILTER WITH BY-PASS
RESERVOIR
PRESSURIZED BREATHER
CASE DRAIN FILTER
WITH BY-PASS
C
P1
A
P
T2
T
D
B1
G
PWM-1
PWM-2
2-SPD
J-STK
HYDRAULIC PUMP
TRAVEL JOYSTICK
3
4
1
2
T
P
S
A2
A1
A
SLEW MOTOR
B
OIL COOLER
V-0633 (3-14-07)
2
1
3
4
20
16
21
22
23
24
25
26
27
28
29
30
15
8
7
34
10
9
11
12
13
14
2 of 2
Dealer Copy -- Not for Resale
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