Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Power Train Caterpillar

Start By:

1. Remove the cab. Refer to Disassembly and Assembly, "Cab - Removal".

2. Separate of main frame and engine frame. Refer to Disassembly and Assembly, "Main Frame and Engine Frame - Separate".

Note: The transmission and the extension housing should be removed as a unit. Removing the transmission and the extension housing as a unit will prevent damage to the power take-off shaft (PTO).

Note: Put identification on all lines, hoses and tubes for installation purposes. Cap all lines, hoses and tubes in order to prevent foreign material from entering the system.

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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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Illustration 1	g00576569

1. Remove magnetic drain plug (1) from the bottom of the center housing (2) and drain the common sump into a suitable container. Reinstall plug (1).
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   Illustration 2	g00691469

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   Illustration 3	g00691472

2. Disconnect tube assemblies (4) from the electronic control valve for the transmission (3) and from the rear of the machine.
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   Illustration 4	g00691485

3. Remove four clamps (5) from tube assemblies (4). Pull tube assemblies (4) out of the rear of the machine.
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   Illustration 5	g00691497

4. Remove bolt (8). Remove brake tube assembly (7) from tee fitting (6).
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   Illustration 6	g00691499

5. Disconnect sixteen electrical connectors (9) and move the electrical connectors out of the way.
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   Illustration 7	g00691504

6. Disconnect both ends of tube assembly (10). Disconnect electrical connectors (11). Disconnect tube assembly (13) from transmission oil filter assembly (12).
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   Illustration 8	g00691519

   Note: Leave the brackets attached to cable assemblies (16).

7. Remove four bolts (15) and remove two brackets (14).
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   Illustration 9	g00691523

8. Disconnect electrical connectors (18). Remove two brackets (17) and set cable assemblies (16) out of the way.
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   Illustration 10	g00691525

9. Disconnect three tube assemblies (19) from steering and hydraulic oil filter assemblies (20).
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   Illustration 11	g00691537

10. Remove two bolts and washers (21) and remove transmission oil filter assembly (12).
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    Illustration 12	g00691540

11. Remove eight bolts and washers (22). Remove steering and hydraulic oil filter assemblies (20).
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    Illustration 13	g00691544
    bottom view of pump group

12. Disconnect suction tube (23) at the center housing. Disconnect tube assembly (24) and hose assembly (26) from the bottom of steering pump (25). Remove tube assembly (19).
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    Illustration 14	g00691546

13. Disconnect tube assembly (27) and hose assembly (28) from the top of steering pump (25).
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    Illustration 15	g00691551

14. Attach a lifting strap to steering pump (25) and attach the other end to a suitable lifting device. Remove four bolts and washers (29). Remove steering pump (25) from pump drive (30). The weight of the steering pump is 91 kg (200 lb).
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    Illustration 16	g00691562

15. Remove 11 bolts and washers (31) and remove cover (32).
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    Illustration 17	g00691571

16. Remove the quick disconnect fitting (33) for the charge pressure.
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    Illustration 18	g00691581

17. Disconnect hose assembly (34) from extension housing (35).
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    Illustration 19	g00691583

18. Support transmission (36) with Tooling (B).
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    Illustration 20	g00691586

    Note: Bolts (38) are different lengths. Mark the bolts and identify the bolts for the proper locations.

19. Remove six bolts and washers (38) from transmission mounting bracket (37). Repeat for the other side.
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    Illustration 21	g00691592

    Note: Breather (39) is mounted on the extension housing for the following serial numbers: (S/N: 8DN1-885) (S/N: 1DR1-1767) (S/N: 7DM1-954).

    Note: Breather (39) is mounted on the cab for the following serial numbers: (S/N: 8DN886-UP) (S/N: 1DR1768-UP) (S/N: 7DM955-UP).

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    Illustration 22	g00691598

20. Remove breather (39) from extension housing (35). Install Tooling (A) and attach a suitable lifting device.
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    Illustration 23	g00691599

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    Illustration 24	g00691601

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    Illustration 25	g00691602

21. Use Tooling (B) to raise transmission (36) in order to clear hardbar (40). Use Tooling (B) to hold transmission (36) in place in order to position blocks.
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    Illustration 26	g00691603

22. Remove bolts (41) from the extension housing.
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    Illustration 27	g00691687

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    Illustration 28	g00691690

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    Illustration 29	g00691691

    Note: Illustration (A) has the bolt pattern for the following serial number range: (S/N: 8DN850-UP) (S/N: 7DM850-UP) (S/N: 1DR1700-UP). Illustration (B) has the bolt pattern for the following serial number range: (S/N: 8DN1-849) (S/N: 7DM1-849) (S/N: 1DR1-1699).

23. Before you separate the transmission and the extension housing from the center housing, you need to hold the pump drive gear (43) and the two couplings (44) through the access cover. The pump drive gear (43) and the two couplings (44) stay in the extension housing during removal. If you fail to do this, pump drive gear (43) and the two couplings (44) will fall when you do the separation. Remove bolts (46) from the center housing.

24. Separate transmission (36) and extension housing (35) from center housing (2). The weight of transmission (36) and extension housing (35) is 1180 kg (2600 lb).