This document provides instructions for disassembling the piston motor (hydrostatic) on a 279C Compact Track Loader. The removal procedure involves 17 steps, including removing hoses, harnesses, bolts, springs, plates, gears, seals, bearings, and other components from the head, barrel assembly, housing, and spindle. Precautions are listed regarding releasing spring forces and containing fluids during the process. Required tools include retaining ring pliers, a slide hammer puller, threaded adapters, drivers, bearing pullers, reaction plates, and a hydraulic wrench.
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2. Shutdown SIS
Previous Screen
Product: COMPACT TRACK LOADER
Model: 279C COMPACT TRACK LOADER MBT
Configuration: 279C Compact Track Loader MBT00001-UP (MACHINE) POWERED BY 3044C Engine
Disassembly and Assembly
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders Power Train
Media Number -KENR8831-06 Publication Date -01/01/2016 Date Updated -06/01/2016
i03007153
Piston Motor (Hydrostatic) - Remove
SMCS - 4351-011
S/N - JMP1-UP
S/N - JSP1-UP
S/N - MBT1-UP
S/N - RTD1-UP
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7575 Link Bracket 2
Start By:
a. Relieve the hydraulic system pressure. Refer to Disassembly and Assembly, "System
Pressure - Release".
b. Remove the track. Refer to Disassembly and Assembly, "Track (Rubber) - Remove and
Install".
Note: Put identification marks on all hoses, on all hose assemblies, and on all harness assemblies
for installation purposes. Plug all hose assemblies. This helps to prevent fluid loss, and this helps
to keep contaminants from entering the system.
NOTICE
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3. 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 Dealer Service
Tool Catalog" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
Illustration 1 g01523568
1. Disconnect hose assemblies (1).
Illustration 2 g01523939
2. Remove cable straps (3).
3. Disconnect harness assembly (4).
4. Disconnect hose assembly (2).
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4. Illustration 3 g01523563
5. Attach Tooling (A) and a suitable lifting device to piston motor (5). The weight of the
piston motor (5) is approximately 91 kg (200 lb).
Illustration 4 g01524029
6. Remove bolts (6). Remove piston motor (5).
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Nov 2 09:16:41 UTC+0800 2019
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5. Shutdown SIS
Previous Screen
Product: COMPACT TRACK LOADER
Model: 279C COMPACT TRACK LOADER MBT
Configuration: 279C Compact Track Loader MBT00001-UP (MACHINE) POWERED BY 3044C Engine
Disassembly and Assembly
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders Power Train
Media Number -KENR8831-06 Publication Date -01/01/2016 Date Updated -06/01/2016
i06177895
Piston Motor (Hydrostatic) - Disassemble - CTL
SMCS - 4351-015
S/N - JMP1-UP
S/N - MBT1-UP
Disassembly Procedure
Table 1
Required Tools
Tools Part Number Part Description Qty
A 136-1452 Retaining Ring Pliers 1
B 6V-2062 Tips 1
C 1P-0074 Slide Hammer Puller Gp 1
D 4C-5651 Threaded Adapter 1
E 1P-0510 Driver Gp 1
F 8H-0663 Bearing Puller Gp 1
G
426-2717 Reaction Plate 1
8T-7338 Bolt 4
9X-8268 Washer 4
H 5F-7339 Adapter 1
J 385-8578 Hydraulic Wrench 1
385-8589 Reaction Arm Assembly 1
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6. 426-2719 Block Assembly 1
J
132-8126 Hydraulic Wrench(1)
1
237-3952 Reaction Arm Assembly(2)
1
426-2720 Block Assembly(3)
1
K
308-5676 Spanner Wrench Assembly(4)
1
329-1669 Spanner Wrench Assembly(5)
1
308-5675 Driver Assembly 1
426-2723 Adapter 1
L
385-8479
Hydraulic Pump Gp
115v
1
384-8916
Hydraulic Pump Gp
208-240v
1
M 1H-3110 Bearing Puller Gp 1
(1)
Can be used in place of 385-8578 Hydraulic Wrench.
(2)
For use with 132-8126 Hydraulic Wrench only.
(3)
For use with 132-8126 Hydraulic Wrench only.
(4)
6 Pin
(5)
7 Pin
Start By:
a. Remove the piston motor.
Illustration 1 g03766418
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7. Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
1. Use suitable press and Tooling (A) and Tooling (B) to remove retaining ring (1) from head
(2).
Illustration 2 g03766438
2. Remove plate (3).
Illustration 3 g03766440
3. Remove springs (4).
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8. Illustration 4 g03766479
4. Use Tooling (C) and Tooling (D) to remove piston (5).
Illustration 5 g03766496
5. Remove bolt (7), speed sensor (6), and the O-ring seal.
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9. Illustration 6 g03766501
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
6. Remove bolts (8) from head (2).
Illustration 7 g03766518
7. Remove head (2) while pushing down on shaft (12) in order to keep the rotating group from
being removed with head (2).
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10. 8. Remove friction discs (9), plates (10), and gear (11).
Illustration 8 g03768399
9. Remove O-ring seal (13), backup rings (14), and O-ring seals (15) from head (2).
Illustration 9 g03771136
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11. Illustration 10 g03771216
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
10. Remove plug (15), O-ring seal (19), spring (18), washer (17), and flushing spool (16) from
head (2).
Illustration 11 g03772724
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12. Illustration 12 g03772728
11. Remove plug (20), O-ring seal (23), spool (21), and insert (22).
Illustration 13 g03772742
Illustration 14 g03772765
Personal injury can result from being struck by parts propelled by a
released spring force.
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13. Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
12. Remove plug (24), O-ring seal (27), spring (26), and relief valve (25).
Illustration 15 g03772776
13. Remove plugs (28), plug (29), and the O-ring seals.
Illustration 16 g03772790
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14. Illustration 17 g03772801
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
14. Remove plugs (30) and the O-ring seals.
15. Remove plug (31), O-ring seal (34), spring (33), and washer (32).
Illustration 18 g03773292
16. Remove port plate (35) from head (2).
Illustration 19 g03773315
17. Use Tooling (E) to remove seal (37) and bearing (36) from the head.
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15. 18. Remove plug (36), O-ring seal (39), spring (38) and valve (37).
Illustration 20 g03773464
19. Remove shaft assembly (12), clip (38), bearing race (39), and barrel assembly (40).
Illustration 21 g03773473
20. Remove piston assemblies (41), retainer (42), and bearing (43) from barrel assembly (40).
Illustration 22 g03773491
21. Remove pins (44) from barrel assembly (40).
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16. Illustration 23 g03776150
Illustration 24 g03355421
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
22. Use Tooling (E) and a suitable press in order to compress spring (48).
23. Remove retaining ring (45), retainers (47) and spring (48) from barrel assembly (40).
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17. Illustration 25 g03362974
24. Remove swashplate (49).
Illustration 26 g03776159
25. Use Tooling (E) and Tooling (M) to remove bearing race (50) from shaft (12).
Illustration 27 g03776175
26. Remove guides (51) and bearing (52).
27. Remove O-ring seals (53) and (54).
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18. Illustration 28 g03355485
28. Attach Tooling (G) to housing (55).
Illustration 29 g03355473
29. Use Tooling (B) in order to remove retaining ring (56).
30. Remove plug (57) and the O-ring seal.
Illustration 30 g03355503
31. Use Tooling (C) and Tooling (H) in order to remove cover (58).
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20. Thank you very much for
your reading. Please Click
Here. Then Get COMPLETE
MANUAL. NO WAITING
NOTE:
If there is no response to
click on the link above,
please download the PDF
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21. Illustration 34 g03362981
37. Use Tooling (E) to remove bearing (69) and shaft seal (70).
Illustration 35 g03355806
Illustration 36 g03355801
38. Drill the stakes from nut (71). Install Tooling (K). Attach Tooling (J) and Tooling (L) to
Tooling (K) and Tooling (G).
39. Remove nut (71) from the spindle.
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22. Illustration 37 g03355938
40. Use Tooling (M) and a suitable press in order to remove spindle (72) from housing (55).
Illustration 38 g03355939
Illustration 39 g03775471
41. Remove Duo-Cone seals (73) and (74).
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Nov 2 09:17:40 UTC+0800 2019
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23. Shutdown SIS
Previous Screen
Product: COMPACT TRACK LOADER
Model: 279C COMPACT TRACK LOADER MBT
Configuration: 279C Compact Track Loader MBT00001-UP (MACHINE) POWERED BY 3044C Engine
Disassembly and Assembly
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders Power Train
Media Number -KENR8831-06 Publication Date -01/01/2016 Date Updated -06/01/2016
i07045211
Piston Motor (Hydrostatic) - Assemble - CTL
SMCS - 4351-016
S/N - JMP1-UP
S/N - MBT1-UP
Assembly Procedure
Table 1
Required Tools
Tools Part Number Part Description Qty
A 136-1452 Retaining Ring Pliers 1
B 6V-2062 Tips 1
C 1P-0074 Slide Hammer Puller Gp 1
D 4C-5651 Threaded Adapter 1
E 1P-0510 Driver Gp 1
F 8H-0663 Bearing Puller Gp 1
G
426-2717 Reaction Plate 1
8T-7338 Bolt 4
9X-8268 Washer 4
H 5F-7339 Adapter 1
J 385-8578 Hydraulic Wrench 1
385-8589 Reaction Arm As 1
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24. 426-2719 Block Assembly 1
J
132-8126 Hydraulic Wrench(1)
1
237-3952 Reaction Arm Assembly(2)
1
426-2720 Block Assembly(3)
1
K
308-5676 Spanner Wrench Assembly(4)
1
329-1669 Spanner Wrench Assembly(5)
1
308-5675 Driver Assembly 1
426-2723 Adapter 1
L
385-8479
Hydraulic Pump Gp
115v
1
384-8916
Hydraulic Pump Gp
208-240v
1
M 1H-3110 Bearing Puller Gp 1
N FT-3318 Tool Gp 1
(1)
Can be used in place of 385-8578 Hydraulic Wrench.
(2)
For use with 132-8126 Hydraulic Wrench only.
(3)
For use with 132-8126 Hydraulic Wrench only.
(4)
6 Pin
(5)
7 Pin
Illustration 1 g03355939
1. Install Duo-Cone seals (73) and (74).
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