©
2002 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR3739-01
October 2002
345B Series II Material Handler
Hydraulic System
345B II MH:
APB1-UP
X
AL4
BL3
BL2
BL1
PTA
PSW
BR1
BR2
AR4
Y
AR1
AR2
BR3
AL1
AL2
AL3
BL4
Main Control Valve
B
B
29 28 27 26 25 24 23 34 22 20
39
38
37
21
36
13
35
15
f00053
PG
PSA
DR4
Pi1
Pi2
Pi3
Pi8
P-IN
PAC
PEPU
C/V
JPi
Pi5
DR1
DR2
DR3
T-OUT
DR5
DR6
Pilot Oil Manifold
60
56
57
58
59
63
64
f00054
XX
B A
DR1
MU
PG1
MU
DR2
AB
PG3
B
JR1
JR3
JR4
JR2
JRT
JRP
JL2
JL4
JL1
JL3
JLT
JLP
AR1
BR1
AL2BL2
X
DR
HL
dL5
aL5
BL4
bL4
AL3
BL3aL3
bL2
AL1
BL1
aL1
PSW
aR1
aR2AR2
BR2
bR3
aR4
Y
HR
AR4
R1
dSW bR2 bR1
PLPR
Pp1 bL1
PAT
aL2
bL3
aL4
PiLaR3
dR4
SA5
SA4
SA3 SA2
SA1
SB5 SB4
SB3
SB2
SB1
SP
L
L1
S
X
Dr1
X2 X1
Dr2
AB
Pi
CDr
T
A
Dr
A
X
X
PiPi
Dr
CC
X
Bd1Bd2
ST
Pp Dr
dR5
T
A
C
C
A
TDrPp
R1
S
R2
X1
X2
M3
X3
A1
M1
A2
M2
R1
A3
T1
L'L'
BR3
R2
B' A'
BR
R3
BR
MB
MA
MB
A'B'
dST1
T1
APi2
A'
PP2
Pi8
PSA
PG
B'
TOUTDR1
DR2
DR3
B
A
DR4
DR5
DR6
Pi3
PIN
PEU
Pi1
Pi2C/V
JPi
Pi5
T2
PTA
OWD
X
T2
MA
TT
TP
PAC
TLA1
TLA2 TRA2
TRA1
B
PSL
A
X
PILOT LINE
DRAIN LINE
Hydraulic Schematic
MAIN CONNECTOR LINE
203-9061
Item
Component
STANDARD COMPONENTS
Component
No.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
27
26
28
29
30
31
32
33
34
35
36
40
42
43
53
54
55
56
58
59
60
44
45
46
47
48
51
49
37
38
39
61
57
50
63
64
65
66
67
41
52
62
68
69
70
71
72
S
E
RIES
II
Stick Cylinders
Swing Motor (Left)
Swing Motor (Right)
Travel Motor (Left)
Travel Brake Valve (Left)
Travel Motor (Right)
Travel Brake Valve (Right)
Grapple Cylinders
Boom Cylinders
Boom Lowering Control Valves
Bleeder Valve
Stick Lowering Control Valves
Line Relief Valve (Stick Cylinder Rod End)
Swivel
Main Control Valve
Pressure Switch (Travel)
Pressure Switch (Boom Raise Operation)
Grapple Control Solenoid
Boom II Control Valve
Line Relief Valve (Stick Cylinder Head End)
Stick I Control Valve
Left Travel Control Valve
Straight Travel Control Valve
Right Travel Control Valve
Attachment Control Valve
Grapple Control Valve
Boom I Control Valve
Stick II Control Valve
Negative Flow Control Relief Valve
Valve (Regeneration)
Valve (Regeneration and Cut)
Logic Valve
Swing Control Valve
Main Relief Valve
Line Relief Valve (Grapple Cylinder Head End)
Line Relief Valve (Grapple Cylinder Rod End)
Line Relief Valve (Boom Cylinder Rod End)
Line Relief Valve (Boom Cylinder Head End)
Negative Flow Control Relief Valve
Pilot Control Valve (Travel)
Pressure Control Valve
Grapple Rotate Motor
Pilot Control Valve (Swing and Stick)
Pressure Switch (Stick or Swing)
Pilot Filter
Grapple Rotate Control Valve
Graple Rotate Pump
Coolant Pump Relief Valve
Slow Return Check Valve
Hydraulic Activation Control Valve
Drain Filter
Bypass Check Valve
Hydraulic Oil Cooler
Radiator
Fan Motor
Return Filter
Solenoid Valve (Leveling)
Travel Speed Solenoid Valve
Solenoid Valve (Trenching)
Proportional Reducing Valve
Pilot Relief Vavle
Hydraulic Tank
Generator Pump
Accumulator
Pilot Oil Manifold
Pilot Control Valve (Bucket and Boom)
Generator Motor
Case Drain Filter (Generator)
Upper Pump
Lower Pump
Pilot Pump
Automatic Travel Speed Control Valve
Cooling Pump
73
PG2
1
1
2
3
4
5
6
7
8
9
10
10
11
12
12
13
20
21
22 23
15
24
35
16
17
14
25
26
27
28
29
19
40
39
38
37
36
34
33
42
32
30
31
41
43
47
48
49
51
52
56
53
54
55
62
57
58
59
60
61
63
65
66
67
68
69
70
45
72
73
71
44
50
46
72 52 50
15
45
19
70
68
69
4 5
62
64
63
55
6 7
44
3
1
42
8
8
8
8
9
61
14
18
46
63
g00935193
