Bobcat 331 Mini Excavator Hydraulic Repair & Troubleshooting Schematic (S/N 234311001 – 234312999) 331E (S/N 234411001 – 234411999) 334 (S/N 234511001 – 234512999)

Q1
Q2
T1,T2
PS
Q1
Q2
T1,T2
PS
BOOM SWING
CYLINDER
BOOM CYLINDER
BUCKET CYLINDER
BLADE CYLINDER
SWIVEL JOINT
E
B
D
A
C
H
F
G
A
UX
BOOST
SWI
BUCKET
ARM
BOOM SW
RH TRA
BOOM
A
B
A
B
B
A
B
A
A
B
A
B
A
B
A
B
A
B
P3
FEMALE
(PRESSURE)
INTERSECTION OF HYDRAULIC LINES
INDICATED BY JUNCTION DOT
PUMP SUPPLY
WORKING CIRCUITS
PILOT PRESSURE
SYSTEM RETURN LINES
ENCLOSURE
DIRECT TANK RETURN
ARM CYLINDER
DIRECT TO TANK VALVE
(EXCLUDE FOR U.S. OPTION)
MALE
(RETURN)
P2
P1
P2
P1
TRAVEL MOTOR
TRAVEL MOTOR
331E ONLY
HYDRAULIC/HYDROSTATIC SCHEMATIC
331 (S/N 234311001 - 234312999)
331E (S/N 234411001 - 234411999)
334 (S/N 234511001 - 234512999)
(PRINTED JANUARY 2005)
V-0473
Printed in USA
10
11
23
33
19
13
17
16
36
34
12
5
30
EXTENDIBLE
ARM CYLINDER
331E ONLY
1 of 2
Dealer Copy -- Not for Resale
1
2
3
4
T
LH JOYSTICK
P
1
2
3
4
T
RH JOYSTICK
P
L
1
I
S
O
L
3
I
S
O
R
1
I
S
O
ISO/STD CONVERTER
(ISO SHOWN)
L
1
L
3
R
3
I
S
O
R
1
R
3
BACK
FRONT
S
T
D
I
S
O
C
P1
P2
P3
B
A
PSI
V1
V2
V3
TOP
SWING MOTOR
BOTTOM
AUX
BOOST
SWING
BUCKET
ARM
BOOM SWING
RH TRAVEL
BOOM
LH TRAVEL
b
a
b
a
T1
b
a
b
a
b
a
B
A
b
a
P1
P2
P3
T
T2
G
BLADE
PB
T1
F
HYDRAULIC PUMP
G1
RIGHT FRONT
REAR
LEFT
RIGHT FRONT
REAR
LEFT
V-0473 (1/12/05)
29
13
14
18
17
15
16
36
35
34
22
25
28
6
7
31
4
3
26
21
20
32
27
9
2
1
24
8
8
30
A3
A2
A1
S1
COOLER
2 of 2
Dealer Copy -- Not for Resale
Categories: Schematics | Tags: | Leave a comment

Leave a Reply

Required fields are marked *