Bobcat 331 Mini Excavator Hydraulic Repair & Troubleshooting Schematic (S/N AACS11001 AND ABOVE) (S/N A9K511001 AND ABOVE) 331E (S/N A9K911001 AND ABOVE) 334 (S/N A9K711001 AND ABOVE)

Q1
Q2
T1,T2
PS
CENTER SWIVEL
JOINT
E
B
D
C
A
H
F
G
P2 P1
R.H. TRAVEL MOTOR
BUCKET
A
B
A
B
BLADE
SLEW
a
b
A
B
A
B
TRVL RH
a
b
TRVL LH
a
b
A
B
AUX 2
a
b
A
B
T
P2
BUCKET
CYLINDER
ARM
CYLINDER
HYDRAULIC/HYDROSTATIC SCHEMATIC
331 (S/N AACS11001 AND ABOVE)
(S/N A9K511001 AND ABOVE)
331E (S/N A9K911001 AND ABOVE)
334 (S/N A9K711001 AND ABOVE)
(PRINTED MAY 2009)
V-0984
6
5
28
29
30
33
37
35
36
35
36
35
36
35
36
35
35
20
21
FEMALE
(PRESSURE)
DIRECT TO
TANK VALVE
(IF EQUIPPED)
MALE
(RETURN)
EXTENDIBLE
ARM CYLINDER
(IF EQUIPPED)
39
38
a
1 of 4
Dealer Copy -- Not for Resale
1
2
3
4
T
LH JOYSTICK
P
1
2
3
4
T
RH JOYSTICK
P
L1
ISO
L3
ISO
R1 ISO
US OPTION
ISO/STD CONVERTER
(ISO SHOWN)
L1
L3
R
3 I
S
O
R
1
R3
BACK
FRONT
STD
ISO
T1
RIGHT FRONT
REAR
LEFT
RIGHT
FRONT
REAR
LEFT
C
P1
A
P
T2
T
D
PWM-1
PWM-2
2-SPD
HYDRAULIC PUMP
TRAVEL JOYSTICK
3
4
1
2
T
P
28
29
30
15
8
7
34
9
12
20
21
2 of 4
Dealer Copy -- Not for Resale
Q1
Q2
T1,T2
PS
CENTER SWIVEL
JOINT
P2 P1
L.H. TRAVEL MOTOR
MLS3
LS2
P1
BUCKET
B
A
B
BOOM SWING
BOOM
a
b
A
B
ARM
a
b
A
B
T3
INTERSECTION OF HYDRAULIC LINES
INDICATED BY JUNCTION DOT
PUMP SUPPLY
WORKING CIRCUITS
PILOT PRESSURE
SYSTEM RETURN LINES
ENCLOSURE
DIRECT TANK RETURN
LOAD SENSE
ARM
CYLINDER
BOOM
CYLINDER
BLADE CYLINDER
LOCKING
VALVE
BOOM SWING
CYLINDER
6
5
32
19
18
17
16
31
26
27
28
37
35
36
35
36
35
36
41
40
b
a
3 of 4
Dealer Copy -- Not for Resale
B
MAIN FILTER WITH BY-PASS
RESERVOIR
PRESSURIZED BREATHER
CASE DRAIN FILTER
WITH BY-PASS
B1
G
2-SPD
J-STK
HYDRAULIC PUMP
S
A2
A1
A
SLEW MOTOR
B
OIL COOLER
V-0892 (5-6-09)
2
1
3
4
16
22
23
24
25
26
27
28
10
9
11
12
13
14
P
P1
LS
T
HYDRAULIC X-CHANGE
(OPTIONAL)
42
43
44
46
45
SLEW LOCK VALVE
(S/N A9K511108 & Above.
S/N A9K711106 & Above
& S/N A9K911053 & Above ONLY)
J1
J2
A
B
B1
A1
47
4 of 4
Dealer Copy -- Not for Resale
Categories: Schematics | Tags: | 1 comment

One Comment

  1. I need a picture of 331 D swivel joint connections to the valve manifold locations . Thanks .

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