NO. 120 MOTOR GRADER Every 500 Service Hours Or 3 Months Caterpillar

(27)Transmission And Flywheel Clutch

1. Stop engine. Remove filter housing drain plug and drain oil.

2. Remove housing cover and element.

3. Remove used element.

4. Check cover seal. Use new one if necessary.

5. Install new element. Tighten nut to 10 ± 2 lb. ft. (1,4 ± 0,3 mkg).

6. Install element and cover.

7. Clean and install drain plug.

8. Start engine and check oil level.

9. Add oil as necessary.

(28)Hydraulic Control System

1. Park machine. Lower all equipment and stop engine.

2. Loosen filler cap.

3. Remove filter housing drain plug and allow to drain.

4. Remove filter base, spring, seat and element.

5. Inspect filter base and plug seals. Replace if necessary.

6. Clean filter housing.

7. Install base, spring, seat and new element.

8. Clean and install filter housing drain plug.

9. Tighten filler cap.

10. Start engine and run for minutes. Stop engine and check oil level.

11. Fill to top of filler neck.

12. Install filler cap tightly.

(29)Diesel Engine Crankcase

1. Oil should be warm and machine on level ground engine stopped. Remove filler plug.

2. Remove crankcase drain plug and drain oil.

3. Remove filter housing drain plug and drain oil.

4. Loosen retaining bolt and remove filter housing and filter element.

5. Clean filter base and replace O-ring if necessary.

6. Clean filter housing and install new filter element.

7. Clean and install filter housing drain plug.

8. Clean and install crankcase drain plug.

9. Disconnect breather hose.

10. Remove breather and wash in clean solvent. Dry with pressure air.

11. Install breather. Tighten bolt to 10 ± 2 lb. ft. (1,3 ± 0,3 mkg). Connect breather hose.

12. Fill crankcase to FULL mark on ENGINE STOPPED side of gauge. See Refill Capacities.

13. Install filler plug. Run engine for 2 minutes. Check oil level to FULL mark on ENGINE RUNNING side of gauge.