637 TRACTOR-SCRAPER Before Starting Caterpillar

1. Check tractor engine crankcase oil level. Oil level should be above FULL mark on gauge.

2. Check tractor engine coolant level. Maintain level 1/2inch (1 cm) below bottom of fill pipe.

3. Check tractor engine fuel level.

4. Check tractor engine air cleaner service indicator. Have filter elements serviced if indicator piston is locked in the visible position.

5. Check tractor transmission oil level. Oil level should show on gauge.

6. Check tractor-scraper hydraulic system oil level. Oil should be above ADD mark in sight gauge or to FULL mark on plunger gauge.

7. Check scraper engine crankcase oil level. Oil level should be above FULL mark on gauge.

8. Check scraper transmission oil level. Oil level should show on gauge.

9. Check scraper engine coolant level. Maintain level 1/2inch (1 cm) below bottom of fill pipe.

10. Check scraper engine air cleaner service indicator. Have filter elements serviced if indicator piston is locked in the visible position.

11. Check scraper engine fuel level.

12. Check tire pressures. (See page 39 for tire inflation pressures.)

13. Check controls for free movement.

Positioning Seat

1. Check seat suspension adjustment while seated.

2. Seat support edge must be even with adjustment line or injury can result.

3. Turn handle until edge is even with line.

4. Push lever to adjust seat forward or backward.

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Seat adjustment must be checked at the beginning of each shift and when operators change. Always check condition of seat belt.