Caterpillar Cat 345B Excavator (Prefix 2NW) Service Repair Manual Instant Download.pdf

Service Repair Manual
Models
345B Excavator

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Product: EXCAVATOR
Model: 345B EXCAVATOR 2NW
Configuration: 345B Excavator 2NW00001-UP (MACHINE) POWERED BY 3176C Engine
Disassembly and Assembly
345B, 345B Series II and W345B Series II Excavators Machine Systems
Media Number -SENR1934-11 Publication Date -01/01/2012 Date Updated -12/01/2012
i01193176
Main Control Valve - Disassemble
SMCS - 5051-015
S/N - 2NW1-UP
S/N - 2SW1-UP
S/N - 2ZW1-UP
S/N - 3MW1-UP
S/N - 4SS1-UP
S/N - 5WS1-UP
S/N - 6MW1-UP
S/N - 6XS1-UP
S/N - 7KS1-UP
S/N - 8KW1-UP
S/N - 8RW1-UP
S/N - 9CW1-UP
S/N - 9GS1-UP
S/N - AGS1-UP
S/N - AKJ1-UP
S/N - AKX1-UP
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

S/N - ALB1-UP
S/N - ALD1-UP
S/N - AMD1-UP
S/N - AMJ1-UP
S/N - AMN1-UP
S/N - APB1-UP
S/N - AYR1-UP
S/N - BFG1-UP
S/N - CCC1-UP
S/N - DCW1-UP
S/N - DET1-UP
S/N - FEE1-UP
Disassembly Procedure
Start By:
A. Remove the main control valve. Refer to Disassembly and Assembly, "Main Control Valve
- Remove".
Note: Put identification marks on all of the components of the main control valve as the
components are being removed. All of the parts must be reinstalled in the part's original
location. Do not damage any of the internal parts during the removal. Keep all of the
internal parts of the valve clean and lubricated.
1. Thoroughly clean the outside of the main control valve prior to disassembling the main
control valve.
2. The weight of the main control valve is 454 kg (1000 lb).
Swing Priority Valve
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Illustration 1 g00638555
1. Remove swing priority valve (2) .
Note: There is spring force against swing priority valve (2). When four bolts (1) that hold
the swing priority valve in place are removed, the spring force will be released. To prevent
possible personal injury, hold swing priority valve (2) in place by hand as bolts (1) are being
removed.
2. While you hold swing priority valve (2) in place, slowly remove four bolts (1) .
3. Remove swing priority valve (2) from the main valve body.
4. Remove spring (3) from the main valve body.
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5. Remove check valve (4) from the main valve body.
6. Disassemble swing priority valve (2), as follows:
a. Remove O-ring seals (5) and (6) from the valve body.
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b. Remove plug (7) .
c. Remove plug (13), valve (11), spool (10) and spring (9) from the valve body.
d. Remove O-ring seal (8) from plug (7) .
e. Remove O-ring seal (12) from plug (13) .
Check valve for the Stick I Control Valve
1. Remove the check valve from the stick I control valve, as follows.
2. Remove plate (14) from the stick I control valve. Remove O-ring seal (15) from the plate.
3. Remove pilot valve (16) from the stick I control valve.
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4. Remove spring (17) from the stick I control valve.
5. Remove check valve (18) from the stick I control valve.
6. Remove sleeve (19) and two shims (20) from the stick I control valve.
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1. Remove adapter (21) from the front of the main valve body.
2. Remove O-ring seal (22) from adapter (21) .
Load Check Valves
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1. Remove six load check valves (23) from the main control valve, as follows:
a. Remove six plugs (27), six springs (25), and six check valves (24) from the main
valve body.
b. Remove O-ring seal (26) from each plug (27) .
Check Valves for the Straight Travel Control Valve
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1. Remove two check valves (28) from the straight travel control valve, as follows:
a. Remove two plugs (31) from the main valve body.
b. Remove O-ring seal (29) and backup ring (30) from each plug.
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c. Remove two springs (33) and two check valves (32) from the left travel control valve
and the right travel control valve.
Check Valves for the Left Travel Control Valve and the
Right Travel Control Valve
1. Remove two check valves (34) from the travel control valves, as follows:
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a. Remove two plugs (36). Remove O-ring seal (35) from each plug (36) .
b. Remove two sleeves (37) from the travel control valves.
Check Valve for the Boom II Control Valve
1. Remove check valve (38) from the boom II control valve, as follows:
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a. Remove plug (42), spring (40) and check valve (39) from the Boom II Control Valve.
b. Remove O-ring seal (41) from plug (42) .
Line Relief Valves
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1. Remove line relief valve (43), (44) and (45) from the top of the main valve. Remove line
relief valve (46), (47), and (48) from the bottom of the main valve.
Note: Only the O-ring seals and backup rings in line relief valves (43), (44), (45), (46), (47),
and (48) are serviceable.
2. Disassemble line relief valves (43), (44), (45), (46), (47), and (48), as follows:
a. Separate adapter (50) from adapter (66) .
b. Remove cap (61) from adjusting screw (60) .
c. Mark the location of nut (68) with a suitable pencil. Unscrew nut (68) from adjusting
screw (60). Make sure that you note the number of turns that are needed to remove
nut (68). The valve must be reset if the number of turns are not documented.
d. Remove spring (67) and needle valve (57) .
e. Remove sleeve (51), valve (53), valve (63), spring (54), and spring (64) from the
bottom half of the relief valve.
f. Remove O-ring seal (49) from adapter (50) .
g. Remove O-ring seal (52) and backup ring (62) from valve (53) .
h. Remove seal (55), backup ring (65), and O-ring seal (56) from adapter (66) .
i. Remove O-ring seals (58) and (59) from nut (68) .
Plug for the Attachment Control Valve
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1. Remove plug (69) from the attachment control valve.
2. Remove O-ring seal (70), backup ring (71), and O-ring seal (72) from plug (69) .
Main Relief Valve
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1. Remove main relief valve (73) from the main valve body.
2. Disassemble main relief valve (73), as follows:
a. Remove nut (74) and adjuster (76) from adapter (77) .
b. Remove adapter (77), spring (79) and valve (80) from valve body (84) .
c. Remove O-ring seal (78) from adapter (77) .
d. Remove O-ring seal (75) from adjuster (76) .
e. Disassemble valve body (84). Remove seat (81), spring (82) and valve (83) from
valve body (84) .
f. Remove O-ring seals (85), (86) and (87) from valve body (84) .
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g. Remove ring (89), collar (88) and the filter from valve (83).
Relief Valve for Negative Flow Control
1. Remove two relief valves (90) for the negative flow control from the main valve bodies.
2. Disassemble the two relief valves for negative flow control, as follows:
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a. Remove plug (97), spring (92) and valve (91) from valve body (95) .
c. Remove O-ring seal (93) and O-ring seal (94) from valve body (95) .
Straight Travel Stem Assembly
1. Remove plug (98) from the main valve body.
2. Remove O-ring seal (99) from plug (98) .
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3. Remove stem (100) for straight travel from the main valve body.
4. Disassemble the stem (100) for straight travel, as follows:
a. Remove piston (107) from spool (106) .
b. Remove plug (101), dowel (103), spring (104) and valve (105) from spool (106) .
c. Remove O-ring seal (102) from plug (101) .
Drift Reduction Valves
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1. Remove the stick drift reduction valve (108) and the boom drift reduction valve (108) .
2. Remove spring (109), valve (110), and barrel (111) from the main valve body.
3. Remove backup ring (112) and O-ring seal (113) from barrel (111) .
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Note: The disassembly for the stick drift reduction valve and the boom drift reduction valve
is identical.
4. Disassemble stick drift reduction valve (108), as follows:
a. Remove bolts (123) and separate valve (114) from adapter (120) .
b. Remove spool (116), guide (117) and spring (118) .
c. Remove O-ring seals (115) and (123) from valve (114) .
d. Remove seal (124) from adapter (120) .
e. Remove backup ring (121), O-ring seal (122), backup ring (125) and O-ring seal
(126) from adapter (120) .
Stem Assemblies for the Main Control Valve
1. Remove bolts (127) that hold nine housings (128) to the main valve bodies.
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2. Remove the nine housings.
3. Remove O-ring seal (129) from each housing (128) .
4. Remove the stems for boom II (130), swing (132), right travel (134), bucket (136), and stick
II (138) from the main valve bodies.
5. Remove the stems for stick I (131), left travel (133), attachment (135), and boom I (137)
from the main valve bodies.
6. Disassemble the stems for boom II (130), swing (132), right travel (134), bucket (136), and
stick II (138), as follows:
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a. Remove bolt (139) from the end of spool (143) .
b. Remove retainer (140), spring (141) and retainer (142) from spool (143) .
Note: The disassembly for the stem for right travel (134) and the stem for left travel
(133) is identical as the previous stems except the stems for travel have an adapter.
7. Remove O-ring seals (144), (146) and (147) from adapter (145) .
8. Disassemble the stem for boom I (137), as follows:
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a. Remove plug (156), spring (154), valve (153), valve (152), spring (151), valve (150),
and spring (149) from spool (148) .
c. Remove bolt (157) and washer (158) from the other end of spool (148) .
d. Remove retainer (160), spring (161), and retainer (162) from the end of rod (159) .
e. Remove rod (159) .
f. Remove spring (163) and valve (164) from the end of spool (148) .
g. Remove O-ring seal (165) from rod (159) .
Stroke Limiter for Tamping Mode
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Note: There is spring force against stroke limiter (167). When two bolts (166) that hold
stroke limiter (167) in position are removed the spring force will be released. To prevent
possible personal injury, hold stroke limiter (167) in place by hand as two bolts (166) are
being removed.
1. While you hold stroke limiter (167) in place, slowly remove two bolts (166). Remove stroke
limiter (167) from the main valve body.
2. Disassemble stroke limiter (167), as follows:
a. Remove plug (168) from valve body (170) .
b. Remove spacer (172), spring (173) and piston (174) from valve body (170) .
c. Remove O-ring seal (169) from plug (168) .
d. Remove O-ring seal (171) from valve body (170) .
Regeneration Valve for the Stick
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1. Remove four bolts (175) from the regeneration valve (176) for the stick.
2. Disassemble the regeneration valve (176) for the stick, as follows:
a. Remove spring (179), spool valve (180), rod (181), spring (182), valve (183), and pin
(185) from valve body (177) .
b. Remove O-ring seals (178), and (184) from valve body (177) .
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3. Remove bolts (186) and nine housings (187) from the main valve bodies.
4. Remove O-ring seal (188) from each housing (187) .
5. Remove spring (189) from the stem for straight travel.
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6. Remove seat (190) from the stem for straight travel.
7. Remove two sensors (191) and plug (192) .
8. Remove O-ring seal (193) from sensors (191) .
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Caterpillar Cat 345B Excavator (Prefix 2NW) Service Repair Manual Instant Download.pdf

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Caterpillar Cat 345B Excavator (Prefix 2NW) Service Repair Manual Instant Download.pdf