637 TRACTOR-SCRAPER Every 125 Service Hours Or 2 Weeks Caterpillar

(18)Tractor Engine Crankcase - Change Oil and Filter Elements

1. When oil is warm, remove crankcase drain plug.

2. Open drain valve and drain oil.

3. Open filter base drain valve.

4. Remove 2 filter covers and elements. Clean covers and housings.

5. Check covers and install new seals.

6. Install new elements. Install covers. Tighten covers to 50 ± 10 lb. ft. (6,9 ± 1,5 mkg).

7. Close filter base drain valve.

8. Close crankcase drain valve.

9. Clean and install drain plug.

10. Fill crankcase. (Refill capacity on page 54.) Check oil level. Should be above FULL mark on gauge.

11. Start engine and check oil level when oil is warm. Maintain oil level to FULL mark on gauge.

(19)Tractor Differential And Final Drives - Check Oil Level

Operate machine on level ground a few minutes. Maintain oil level to FULL mark on gauge. Do not drain oil if above FULL.

(20)Scraper Differential And Right Final Drive - Check Oil Level

Machine must be on level ground. Maintain oil level between FULL and ADD OIL mark on gauge. Do not overfill.

(21)Scraper Left Final Drive - Check Oil Level

1. Machine must be on level ground, with drain plug down. Loosen fill plug. If oil comes out tighten plug. Do not drain oil.

2. To add oil, remove fill plug and add oil to the level of the plug. Install plug.