SENR6220 -01
16 Page, B/W
©
All Rights Reserved
Printed in U.S.A.
SENR6228-01
APRIL 1996
©
A1996 Caterpillar
All Rights Reserved
Printed in U.S.A.
Two Speed Hammer
350 & 350 L Excavators
Hydraulic System - Attachment
350:
7RK1-324
2ZL1-170
8HK1-UP
350 L:
9DK1-212
9FL1-419
3ML1-684
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
RE
HE
RE
RE
RE
HE
HE
HE
LOWER
RAISE
OUT
OPEN
CLOSE
OPEN
REVERSE
REVERSE
FORWARD
FORWARD
X
IN
X
CLOSE
60
58
56
46
20
51
21
47
55
54
57
53
52
2
50
49
48
43
59
45
Main Control Valve
17
34
Pilot Oil Manifold
35
33
Item
No
Description
1 Teil-Nr.Right Travel Motor
31 Swing Pump
2 Left Travel Motor
32 Differntial Relief Valve
3 Spring Parking Brake Control Valve
33 Travel Speed Solenoid Valve
4 Right Wing Motor
34 Pilot Oil Manifold
5 Left Swing Motor
35 Pilot Relief Valve
6 Bucket Cylinder
36 Drain Filter
7 Stick Cylinder
37 Hydraulic Tank
8 Boom Cylinder
38 Pilot Pump
9 Boom Drift Reduction Valve
39 Front Pump
10 Travel Brake Valve (right)
40 Rear Pump
11 Travel Brake Valve (left)
41 Hydraulic Activation Control Valve
12 Swing Control Valve
42 Accumulator
13 Swivel
43 Attachment Control Valve
14 Swing Pressure Switch
44 Main Relief Valve
15 Swing Power Control Pressure Switch
45 Stick Control Valve
16 Stick Drift Reduction Valve
46 Signal Duplication Valve (Right Body)
17 Main Control Valve
47 Selector Valve
18 Travel Pressure Switch
48 Boom Control Valve
19 Implement Pressure Switch
49 Left Travel Control Valve
20 Relief Valve (Travel Left)
50 Right Travel Control Valve
21 Signal Relief Valve
51 Main Relief Valve (Left Body)
22 Pilot Control Valve (Travel Left)
52 Compensator Valve
23 Pilot Control Valve (Travel Right)
53
Relief Valve (Bucket Cylinder Rod End)
24 Pilot Control Valve (Boom/Bucket)
54
Relief Valve (Bucket Cyliner Head End)
25 Pilot Control Valve (Swing/Stick)
55
Relief Valve (Stick Cylinder Head End)
26 Automatic Travel Speed Change Valve
56 Combiner Valve
27 Proportional Reducing Valve
57 Relief Valve (Boom Cylinder Rod End)
28 Pilot Filter
58 Neutral Bypass Solenoid Valve
29 Bypass Check Valve
59 Bucket Control Valve
30 Back Pressure Valve
Standard Components
Attachment Components
Solenoid Valve
1362840
32
39
11
2
26
14
38
31
43
30
1716
60
29 41 25 42 22 24 23 8 7
6
10 27 34 15 5 12 4 3 13 37 9
SENR6228-01
16 Page, Color 2, (Dimensions: 34 inches x 24 inches)
1
2
3
4
5
6
7
9
1
2
3
4
5
6
7
A
B
A
B
C
D
E
F
C
D
E
F
3
4
56
7
3
4
56
7
A
B
C
D
E
F
A
B
C
D
E
F
1
2
8
9 8
THIS SCHEMATIC IS FOR THE 350 and 350 L EXCAVATOR
PART #: 103-1351 2 SPEED HAMMER (ATTACHMENT)
This Attachment Schematic is intended to be used in conjunction
with the Standard Hydraulic Schematic in this Service Manual.
PILOT LINE
DRAIN LINE
MAIN CONNECTOR LINE
60
Item
No
Description
1 Teil-Nr.Right Travel Motor
31 Swing Pump
2 Left Travel Motor
32 Differntial Relief Valve
3 Spring Parking Brake Control Valve
33 Travel Speed Solenoid Valve
4 Right Wing Motor
34 Pilot Oil Manifold
5 Left Swing Motor
35 Pilot Relief Valve
6 Bucket Cylinder
36 Drain Filter
7 Stick Cylinder
37 Hydraulic Tank
8 Boom Cylinder
38 Pilot Pump
9 Boom Drift Reduction Valve
39 Front Pump
10 Travel Brake Valve (right)
40 Rear Pump
11 Travel Brake Valve (left)
41 Hydraulic Activation Control Valve
12 Swing Control Valve
42 Accumulator
13 Swivel
43 Attachment Control Valve
14 Swing Pressure Switch
44 Main Relief Valve
15 Swing Power Control Pressure Switch
45 Stick Control Valve
16 Stick Drift Reduction Valve
46 Signal Duplication Valve (Right Body)
17 Main Control Valve
47 Selector Valve
18 Travel Pressure Switch
48 Boom Control Valve
19 Implement Pressure Switch
49 Left Travel Control Valve
20 Relief Valve (Travel Left)
50 Right Travel Control Valve
21 Signal Relief Valve
51 Main Relief Valve (Left Body)
22 Pilot Control Valve (Travel Left)
52 Compensator Valve
23 Pilot Control Valve (Travel Right)
53
Relief Valve (Bucket Cylinder Rod End)
24 Pilot Control Valve (Boom/Bucket)
54
Relief Valve (Bucket Cyliner Head End)
25 Pilot Control Valve (Swing/Stick)
55
Relief Valve (Stick Cylinder Head End)
26 Automatic Travel Speed Change Valve
56 Combiner Valve
27 Proportional Reducing Valve
57 Relief Valve (Boom Cylinder Rod End)
28 Pilot Filter
58 Neutral Bypass Solenoid Valve
29 Bypass Check Valve
59 Bucket Control Valve
30 Back Pressure Valve
Standard Components
1362840
32
39
11
2
26
14
38
31
43
30
1716
60
29 41 25 42 22 24 23 8 7
6
10 27 34 15 5 12 4 3 13 37 9
XA
PD
JL3
JL1
JR3
JR1
JR2
TRT
TLP
TLA1
TLA2
MA
G
A
ST2
TRA2
TRA1
TRP
TLT
(CLOSE)
Pi
R
T1
L'
L'
BR
BR
MB MA
M
MB
A'B'
PR
PG
E
F
D
SH
XB
MA
T1
A'
SH
D
F
E
P
T
M2
M1
B'
B
P1
T
P2
Pi
Dr
A
T2
X
T2
A2
DR5
JPd
Jd
JPg
JP1
(OPEN)
(UP)
JL2JL4JR4
Pi1 Pi2 Pi3
aR3
DR1
aL3
bR3
DR2
DR3
bL3
aL1
aR1
bL4
aL4
bR1
PF
PR
SV1
bL1
PP
TOUT
PIN
PG
SV2
LS2
DR4
AL4
BR1
R2
AR1
Pi4
BL1
AL1
IMP2
PSW
PTA
TRBM1
DS
LS1
AR3BR3
AL3
BL3
AL2
PG
PR
BL4
bL2
dR1
A3
A4
A5
A1
S
P
B1
T
B2
B3
BSIN
BM2
IMP1
T
T
P
SD1
P
aL2
R1
A
B4
B5
2 SPEED
Z
Y
IN
OUT
HAMMER
P
A
(DOWN)(CLOSE)
T
(OPEN)
M
MA
Pi2
B
Pi1
T
A
HL1
HL2
PD
P1
T
P2Pi
Dr
P
X
PS1
LS1
S1Dr1 Dr2
LS2
BL2
PS
SA2
M2
P2
P1
M1
SA1
UP
7Y5005
60
1
2
3
4 5
6
7
8
10
11
12
13
14
17
15
19
18
16
44
43
52
59
53
54
55
56
4645
21
47
48
49 50
51
20
58
57
23
24
25
26
33
41
42
27
34
35
28
29
30
37
36
40
39
38
32
9
22
31
C75048
103-1351
2 SPEED HAMMER (attachment)
Attachment Components
1
Solenoid Valve
