304.5 Mini Hydraulic Excavator Service Manual

Service Repair Manual
Models
304.5 Mini Hydraulic
Excavator

Shutdown SIS
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Product: MINI HYD EXCAVATOR
Model: 304.5 MINI HYD EXCAVATOR ANR
Configuration: 304.5 Mini Hydraulic Excavator ANR00001-UP (MACHINE) POWERED BY 3024 Engine
Disassembly and Assembly
304.5 Mini Hydraulic Excavator Machine Systems
Media Number -RENR3548-04 Publication Date -01/08/2008 Date Updated -18/08/2008
i01368358
Piston Pump - Disassemble
SMCS - 5070-015
Disassembly Procedure
Table 1
REQUIRED TOOLS
Tool Part Number Part Description Qty
A 1P-1857 Snap Ring Pliers 1
B 1P-1859 Snap Ring Pliers 1
Start By:
A. Remove the piston pump. Refer to Disassembly and Assembly, "Piston Pump - Remove".
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
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304.5 Mini Hydraulic Excavator ANR00001-UP (MACHINE) POWERED BY 3024 E...
2020/2/21
https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

Note: Put identification marks on the pump and on all lines for installation purposes. Plug all
lines. This will help to prevent fluid loss and this helps to keep contaminants from entering the
system.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism.
Illustration 1 g00722015
1. Remove allen head screw (1) .
2. Remove hub (2) from the shaft.
3. Remove collar (3) from the pump head.
4. Remove coupling (4) from the pump head.
5. Remove O-ring (5) from the pump head.
Note: Do not remove large allen head screw on valve (7).
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6. Remove two allen head screws (6) from the valve.
7. Remove valve (7) .
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8. Remove piston (8) from the pump head.
9. Remove O-ring (9) from piston (8) .
Note: One allen head screw (10) is longer than the other three allen head screws.
10. Remove four allen head screws (10) .
11. Remove pump head (11) from the pump body.
12. Rotate the pump head to the other side.
13. Remove O-ring (12) from the pump head.
14. Remove four O-rings (13) from the pump head.
15. Remove plate (14) from the pump head.
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16. Remove two allen head screws (15) from the piston block.
17. Remove piston block (16) from the pump head.
18. Remove O-rings (17), (18), and (19) from the piston block.
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19. Remove springs (20) and (21) from the pump body.
20. Use Tooling (A) to remove snap ring (22) .
21. Remove pump rotating group (23) from the shaft.
22. Remove spring retainer (24) from the swashplate.
23. Remove four allen head screws (25) from plate (26) .
24. Remove plate (26) from the pump body.
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25. Rotate plate (26) to the other side.
26. Remove O-ring (27) from the plate.
27. Remove valve assembly (28) from the pump body.
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28. Use Tooling (B) to remove snap ring (29) from the pump body.
29. Remove plate (30) from shaft (31) .
30. Remove shaft (31) from the pump body.
31. Rotate plate (30) to the other side.
32. Remove O-ring (32) from the plate.
33. Remove O-ring seal (33) from the plate.
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34. Use Tooling (A) to remove two snap rings (34) from shaft (31) .
35. Remove bearing (35) from shaft (31) .
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Fri Feb 21 23:29:23 UTC+0800 2020
9/9
2020/2/21

Shutdown SIS
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i01369293
Piston Pump - Assemble
SMCS - 5070-016
Assembly Procedure
Table 1
REQUIRED TOOLS
Tool Part Number Part Description Qty
A 1P-1857 Snap Ring Pliers 1
B 1P-1859 Snap Ring Pliers 1
NOTICE
containing fluids.
Note: Cleanliness is an important factor. Before the assembly procedure, the interior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism.
1/9
2020/2/21

1. Install bearing (35) onto shaft (31) .
2. Use Tooling (A) to install two snap rings (34) onto shaft (31) .
3. Install a new O-ring seal (33) into plate (30) .
4. Install a new O-ring (32) to plate (30) .
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5. Position shaft assembly (31) into the pump housing.
6. Install plate (30) onto shaft (31) and the pump housing.
7. Use Tooling (B) to install snap ring (29) onto shaft (31) .
8. Install valve assembly (28) to the pump body.
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9. Install a new O-ring (27) to plate (26) .
10. Place plate (26) to the pump housing.
11. Install four allen head screws (25) to plate (26). Tighten the allen head screws to a torque of
12 ± 3 N·m (9 ± 2 lb ft).
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12. Place spring retainer (24) to the swashplate.
13. Install pump rotating group (23) onto the shaft.
14. Use Tooling (A) to install snap ring (22) onto the shaft.
15. Install springs (21) and (20) into the pump housing.
16. Install new O-rings (17) , (18), and (19) onto the piston block.
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17. Place piston block (16) on the pump head.
18. Install two allen head screws (15) to piston block (16) .
19. Install plate (14) to the pump head.
20. Install four new O-rings (13) to the pump head.
21. Install a new O-ring (12) to the pump head.
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22. Place pump head (11) onto the pump body.
23. Install four allen head screws (10) to pump head (11). Tighten the allen head screws to a
torque of 55 ± 14 N·m (41 ± 10 lb ft).
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24. Install a new O-ring (9) onto piston (8) .
25. Install piston (8) into the pump head.
26. Place valve (7) on the pump head.
27. Install two allen head screws (6) to the valve.
28. Install a new O-ring (5) to the pump head.
29. Install coupling (4) into the pump head.
30. Install collar (3) into the pump head.
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31. Install hub (2) onto the shaft.
32. Install allen head screw (1) to hub (2). Hub (2) must be installed against the shoulder of the
shaft. Tighten the allen head screw to a torque of 49 ± 9 N·m (36 ± 7 lb ft).
End By: Install the piston pump. Refer to Disassembly and Assembly, "Piston Pump - Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Fri Feb 21 23:30:20 UTC+0800 2020
9/9
2020/2/21

Shutdown SIS
Previous Screen
i01348698
Piston Pump - Install
SMCS - 5070-012
Installation Procedure
NOTICE
containing fluids.
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1. Use a suitable lifting device to support the piston pump (10) in place. Weight of the piston
pump is 27 kg (60 lb).
2. Install the piston pump to the engine with a suitable lifting device.
3. Install washers and two bolts (9).
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4. Install a new O-ring (8) .
5. Install washers and four bolts (7) .
6. Connect lines (5) and (6) to the piston pump.
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7. Position left rear support assembly (4) .
8. Install washers and four bolts (3) .
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