Important Information

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When tests and adjustments are made to the transmission, the parking brake must be OFF. To prevent movement of the machine and personal injury do the procedure that follows.

1. Lower the bulldozer and ripper to the ground.

2. Put blocks in front of and behind the tracks.

3. Let only approved personnel on the machine and keep other personnel off of the machine and in clear view of the operator.

NOTE: All tests and adjustments must be made with the oil in the power train hydraulic system at normal temperature for operation. Make sure that the linkage adjustments are correct before any tests are made.

Do not connect or disconnect the couplings when there is pressure in the system. This will prevent damage to the seal that is in the coupling.

Power Shift Transmission

Transmission Hydraulic Controls Schematic (First Forward)

1. Selector valve body.

2. Priority valve.

3. Oil filter.

4. Speed selector valve spool.

5. Oil pump.

6. Directional selector valve spool.

7. Oil sump and screen.

8. Torque converter inlet relief valve spool.

9. Torque converter.

10. Pressure control valve body.

11. Oil cooler.

12. Orifice.

13. Transmission lubrication relief valve.

14. Load piston.

15. Modulating relief valve spool.

16. Differential valve spool.

A. Speed clutch oil pressure tap (P1).

B, C and D. Transmission pump oil pressure taps.

E. Directional clutch oil pressure tap (P2).

F. Torque converter outlet oil pressure tap.

G. Torque converter inlet oil pressure tap (P3).

H. Transmission lubrication oil pressure tap.

7S4621 Pressure Control Valve Group 10. Body of the pressure control valve. 14. Load piston. 15. Modulating relief valve. 16. Differential valve. 17. Spacers.

2P9179 Selector Valve Group 1. Body of the selector valve. 4. Speed selector valve spool. 6. Spool for direction selector. 8. Torque converter inlet relief valve spool.

8P1891 Priority Valve Group 2. Priority valve. 18. Spacers.

Location Of The Pressure Taps

B. and C. Oil pump.

A. Speed clutch, P1. E. Direction clutch, P2. G. Inlet to the torque converter, P3. H. Lubrication.

F. Outlet from the torque converter.

I. Right steering clutch. J. Left steering clutch. Use 5P5224 PRESSURE GAUGE KIT to check pressure.

Adjustment Of Control Linkage

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Transmission control linkage adjustment should be made only with the engine OFF. Accidental transmission engagement and sudden machine movement could cause personal injury.

1. Remove cotter pins and pins from levers (24) and (27).

Transmission Control Linkage 19. Transmission selector lever. 20. Transmission lock lever. 21. Rod. 22. Rod. 23. Rod. 24. Lever. X. 4.84 ± .04 in. (123 ± 1.0 mm) dimension. Y. 3.76 ± .04 in. (95.5 ± 1.0 mm) dimension.

2. Move transmission selector lever (19) to the FORWARD side of the NEUTRAL opening of shift guide (26) as shown. Move lever (20) to the ON position to make sure lever (19) stays in the NEUTRAL position.

3. Move lever (24) toward the front of the machine. The movement of lever (24) will move direction spool (6) to the FORWARD position.

Transmission Selector Lever On The Forward Side Of The Neutral Opening 19. Transmission selector lever. 26. Shift guide.

4. Adjust rod (22) to length so that dimension (Y) is 3.76 ± .04 in. (95.5 ± 1.0 mm).

5. Adjust rod (23) to length so that dimension (X) is 4.84 ± .04 in. (123 ± 1.0 mm).

Top View Of Transmission Control Linkage 19. Transmission selector lever. 21. Rod. 23. Rod. 24. Lever. 25. Rod. 27. Lever.

6. Make adjustments, as necessary, to the length of rod (21) until the pin can be installed to hold rod (22) on lever (24).

7. Move lever (27) clockwise (when seen from left side of machine). The movement will put speed spool (4) in the NEUTRAL position.

8. Make adjustments, as necessary, to the length of rod (25) until the pin can be installed to hold rod (25) on lever (27).

9. Move lever (20) to the OFF position. Move transmission selector lever (19) through the entire operating range and check for correct detent engagement at each position.