304CR Travel Motor Disassembly

Service Repair Manual
Models
304CR Mini Hydraulic
Excavator

Shutdown SIS
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Product: MINI HYD EXCAVATOR
Model: 304 MINI HYD EXCAVATOR NAD
Configuration: 304CR Mini Hydraulic Excavator NAD00001-UP (MACHINE) POWERED BY S4L2 Engine
Disassembly and Assembly
304 Mini Hydraulic ExcavatorEngine Supplement and Machine Systems
Media Number -RENR6668-01 Publication Date -01/01/2004 Date Updated -19/01/2004
i01823295
Travel Motor - Disassemble
SMCS - 4351-015; 79PC-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1862 Snap Ring Pliers 1
B 1U-7588 Pry Bar 2
Start By:
A. Remove the piston motor (travel). Refer to Disassembly and Assembly, "Piston Motor
(Travel) - Remove" in this manual.
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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304CR Mini Hydraulic Excavator NAD00001-UP (MACHINE) POWERED BY S4L2...
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

Note: Put identification marks on the travel motor 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.
1. Put an alignment mark across the section of the travel motor and the final drive for assembly
purposes. The parts must be reinstalled in the original locations of the parts.
Illustration 1 g00763560
2. Remove plugs (1). Drain the oil.
3. Remove bolts (2). Remove plate (3) .
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4. Remove port plate (4) .
5. Remove barrel assembly (5) .
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6. Put identification marks on piston assemblies (6) in order to indicate the locations of the
pistons in the retainer plate (7) and the barrel (8). Remove piston assemblies (6) and retainer
plate (7) from barrel (8) as a unit. Separate the piston assemblies from the retainer plate.
7. Remove guide (9) and pins (10) from barrel (8) .
8. Remove swashplate (11) .
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9. Remove piston (12), and spring (13) .
10. Use a 0.25 mm (0.010 inch) feeler gauge to a 0.38 mm (0.015 inch) feeler gauge. Remove
ring (14) from the groove between cover (15) and the final drive housing.
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11. Remove cover (16) .
12. Remove O-ring seal (17) .
13. Use Tooling (A) in order to remove retaining rings (18) .
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14. Remove gears (19). Remove gear (20) .
15. Remove shaft (21). Remove bearing (22) .
16. Remove pivots (23), and lip seal (24) .
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NOTICE
The thread lock compound that is used on the reamer bolts may cause
the reamer bolts to seize during removal.
The reamer bolts should be slowly removed by hand. Do not use an
impact wrench in order to remove the reamer bolts. If the reamer bolts
will no longer turn during removal, do not force or complete the
removal. Instead, tighten the bolts, then try to loosen them again.
17. Carefully remove bolts (25). Remove retaining rings (26) .
18. Use Tooling (B) in order to separate spindle (27) from housing (28) .
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19. Remove flange (29), and bearing (30) .
20. Remove gear (31) .
21. Remove shaft assemblies (32), and gear (33) .
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22. Remove bearing cone (35), and bearing cone (38) from shaft (34). Remove bearing (36),
and bearing (37) from shaft (34) .
23. Remove Duo-Cone seal kit (39). Remove pins (40). Remove bearing (41) .
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304CR Mini Hydraulic Excavator NAD00001-UP (MACHINE) POWERED BY S4...
2020/2/22

24. If necessary, remove valve (42). Remove bearing (43) .
25. Remove plugs (44), and the O-ring seals. Remove springs (45), stoppers (46), and spool
(47) .
26. Remove plugs (48), and the O-ring seals. Remove springs (49), and stoppers (50) .
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27. If necessary, remove plugs (51). Remove plug (52), and the O-ring seal. Remove plug (53) .
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Feb 22 23:33:00 UTC+0800 2020
12/12
2020/2/22

Shutdown SIS
Previous Screen
Product: MINI HYD EXCAVATOR
Model: 304 MINI HYD EXCAVATOR NAD
Configuration: 304CR Mini Hydraulic Excavator NAD00001-UP (MACHINE) POWERED BY S4L2 Engine
Disassembly and Assembly
304 Mini Hydraulic ExcavatorEngine Supplement and Machine Systems
Media Number -RENR6668-01 Publication Date -01/01/2004 Date Updated -19/01/2004
i01669600
Travel Motor - Disassemble
SMCS - 4351-015; 79PC-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1862 Snap Ring Pliers 1
B 1U-7588 Pry Bar 2
Start By:
A. Remove the piston motor (travel). Refer to Disassembly and Assembly, "Piston Motor
(Travel) - Remove" in this manual.
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.
1/12
2020/2/22

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304CR Travel Motor Disassembly

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