Caterpillar Cat 420F Backhoe Loader (Prefix JWJ) Service Repair Manual (JWJ00001 and up).pdf

Service Repair Manual
Models
420F Backhoe Loader

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Product: BACKHOE LOADER
Model: 420F BACKHOE LOADER JWJ
Configuration: 420F Backhoe Loader JWJ00001-UP (MACHINE) POWERED BY C4.4 Engine
Disassembly and Assembly
416F, 420F and 430F Backhoe Loaders Machine Systems
Media Number -UENR2321-04 Publication Date -01/01/2014 Date Updated -03/11/2016
i06851396
Piston Pump - Disassemble - Main Hydraulic
SMCS - 5070-015; 5455
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
437-3776 Fixture As. 1
1U-9128 Adapter Plate 1
1U-5750 Engine Stand 1
B 9S-9152 Bearing Puller 1
Start By:
a. Remove the piston pump (main hydraulic).
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420F Backhoe Loader JWJ00001-UP (MACHINE) POWERED BY C4.4 Engine(SEB...
2019/11/22
https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

Illustration 1 g06141568
Sudden release of spring force can cause injury.
To prevent the possibility of injury, follow the procedure to relieve the
spring pressure.
1. Secure the piston pump to Tooling (A) or a suitable fixture.
2. Remove nut (2) and the O-ring seal, solenoid (3), and valve (4) from main pump housing
(6).
3. Remove bolts (5) and compensator valve (1) from main pump housing (6).
4. Remove actuator piston (7), spring guide (8), spring (9), spool (10), and O-ring seals (11)
from valve (4).
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spring pressure.
5. Remove gasket (12) from compensator valve (1).
6. Remove plug (18), O-ring seal (17), spring (16), spring (15), guide (14), and spool (13)
from compensator valve (1).
7. Remove plug (24), O-ring seal (23), spring (22), spring (21), guide (20), and spool (19)
from compensator valve (1).
spring pressure.
8. Remove cover (27) and the O-ring seal. Remove adjustment screw (28) and the O-ring seal.
Remove bolts (25) and head assembly (26).
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9. Remove O-ring seal (29) and port plate (31) from head assembly (26).
10. Remove bearing cup (30) from head assembly (26).
11. Remove bearing cone (31), O-ring seals (32), and shim (33) .
12. Use Tooling (A) to rotate main pump housing (6) to a horizontal position. Remove rotary
group (34).
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13. Remove swashplate (35) from main pump housing (6).
14. Remove shaft assembly (36) and spring (37).
15. Use Tooling (B) and a suitable press to remove bearing cone (38) from shaft assembly (36).
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16. Remove screws (39) and bearings (40). Remove bearing cup (41).
17. Remove retaining ring (42) and shaft seal (43) from main pump housing (6).
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Fri Nov 22 22:55:40 UTC+0800 2019
6/6
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i06851397
Piston Pump - Assemble - Main Hydraulic
SMCS - 5070-016; 5455
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
437-3776 Fixture As. 1
1U-9128 Adapter Plate 1
1U-5750 Engine Stand 1
C 8H-8581 Feeler Gauge 1
D 8T-5096 Indicator 1
E
1B-9575 Bolt 1
5S-0003 Nut 1
F 6V-2055 Grease 1
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1. Install shaft seal (43) and retaining ring (42) into main drive pump housing (6).
2. Use the proper equipment to handle the bearing cup. Lower the temperature of bearing cup
(41). Install bearing cup (41).
3. Install bearings (40) and screws (39). Tighten screws (40) to a torque of 5 ± 1 N·m
(44 ± 8 lb in).
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4. Use the proper equipment to handle bearing cone (38). Raise the temperature of bearing
cone (38) to a maximum of 121 °C (250 °F). Install bearing cone (38) onto the shaft
assembly (36).
5. Install shaft assembly (36) and spring (37).
6. Use the following steps to determine the proper preload on the bearings of the pump
assembly.
a. Use the proper equipment to handle the bearing cup. Lower the temperature of
bearing cup (30) and install the bearing cup in head assembly (26).
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b. Install bearing cone (31) onto shaft assembly (36).
Assemble the pump without shim (10) in order to check the preload of bearing cone
(7).
c. Position the head assembly onto the main drive pump housing. Install bolts
(25).Tighten bolts (25) to a torque of 205 ± 10 N·m (151 ± 7 lb ft).
d. Set bearing preload before you install the rotating group. The bearing preload should
be 0.00 to 0.05 mm (0.000 to 0.002 inch) .
e. Install Tooling (E) into shaft assembly (36). Install Tooling (D) onto the pump
housing. Use Tooling (D) to determine the end play of shaft (36). Be sure that you
move shaft (36) completely in both directions. Use appropriate tools to move shaft
(36).
f. If necessary, grind the adjustment shim to obtain the correct dimension between the
head assembly and the main drive pump housing. If necessary, replace the shim with
a new part.
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g. The thickness of the shim should equal the end play measurement plus 0.0508 mm
(0.00200 inch). For example, if the end play is 2.1590 mm (0.08500 inch) then the
shim thickness should be 2.2098 mm (0.08700 inch).
h. Record the measurement.
i. If necessary, grind the shim to the determined measurement.
j. Remove the head assembly from the main drive pump housing. Remove the bearing
cone and the adjustment shim from the shaft assembly.
k. Proceed with the assembly of the main hydraulic pump.
Note: It is necessary to compress spring (37) through hole in pump housing (6) to install
swashplate (35).Ensure that spring (37) is installed correctly onto swashplate (35) before
continuing the assembly.
7. Install swashplate (35) into main drive pump housing (6).
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8. Install rotary group (34), shim (33) that was determined in Step 6, and O-ring seals (32).
9. Install bearing cone (31) into main pump housing (6).
10. Apply Tooling (F) to the back of port plate (31) and install onto head assembly (26).
11. Install O-ring seal (29) onto head assembly (26).
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Improper assembly of parts that are spring loaded can cause bodily
injury.
To prevent possible injury, follow the established assembly procedure
and wear protective equipment.
12. Install head assembly (26) and bolts (25). Tighten bolts (25) to a torque of 205 ± 10 N·m
(151 ± 7 lb ft).
13. Install adjustment screw (28) and the O-ring seal. Install cover (27) and the O-ring seal.
injury.
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14. Install spool (19), guide (20), spring (21), spring (22), O-ring seal (23), and plug (24) into
compensator valve (1).
15. Install spool (13), guide (14), spring (15), spring (16), O-ring seal (17), and plug (18) into
compensator valve (1).
16. Install gasket (12) onto compensator valve (1).
injury.
17. Install O-ring seals (11) onto valve group (4). Install spool (10), spring (9), guide (8), and
actuator piston (7) onto valve (4).
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18. Install valve (4) and the O-ring seal into main drive pump housing (6). Install solenoid (3),
nut (2), and the O-ring seal onto valve (4).
19. Install compensator valve (1) and bolts (5) onto main drive pump housing (6). Tighten bolts
(5) to a torque of 15 ± 2 N·m (132 ± 17 lb in).
End By:
a. Remove from Tooling (A).
b. Install the piston pump (main hydraulic).
Fri Nov 22 22:56:36 UTC+0800 2019
9/9
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i05068971
Hydraulic Tank - Remove and Install
SMCS - 4332-010; 5056-010; 5056-011; 5056-012
Removal Procedure
Start By:
a. Remove cab.
1. Disconnect hoses (2) from hydraulic tank assembly (1).
2. Disconnect clamp (3) and hose (4).
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3. Disconnect clamp (5).
4. Remove bolts (6) and hydraulic tank assembly (1).
5. Remove strainer (7) and gauge (8) from hydraulic tank assembly (1).
6. Remove bolts (9) and bracket assembly (10) from hydraulic tank assembly (1).
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Installation Procedure
1. Install hydraulic tank assembly in the reverse order of removal.
a. Tighten bolts (9) to a torque of 50 ± 5 N·m (37 ± 3 lb ft).
b. Tighten strainer (7) to a torque of 50 ± 5 N·m (37 ± 3 lb ft).
c. Tighten gauge (8) to a torque of 8 ± 1 N·m (71 ± 9 lb in).
d. Tighten bolts (6) to a torque of 35 ± 5 N·m (26 ± 4 lb ft).
Fri Nov 22 22:57:32 UTC+0800 2019
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Caterpillar Cat 420F Backhoe Loader (Prefix JWJ) Service Repair Manual (JWJ00001 and up).pdf

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