621B TRACTOR-SCRAPER Starting The Engine Caterpillar

1. Move transmission control lever to NEUTRAL.

2. Turn transmission control lever safety lock to ON.

3. Push brake control to PARK.

4. Move hitch control lever to LOCKDOWN.

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Clear hitch area before moving lever.

5. Move scraper controls to HOLD.

6. Insert key and turn disconnect switch to ON.

7. Depress accelerator to just past detent position.

8. BELOW 60°F (16°C) push in and turn HEAT-START switch to HEAT for indicated time (see Starting Aid Chart on page 22).

9. Push in and turn HEAT-START switch to START. Release switch as soon as engine starts. ⁽¹⁾

10. When engine starts, it may be necessary to return HEAT-START switch to HEAT until engine runs smoothly.

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⁽¹⁾If engine does not start after 10 seconds, switch to HEAT for 30 seconds, then to START. If engine again does not start, let starter cool 2 minutes then repeat starting procedure.

When Starting Fluid is Required

7. Depress accelerator to just past detent position.

8. Push in and turn HEAT-START switch to HEAT for indicated time (see Starting Aid Chart on page 22).

9. Push in and turn HEAT-START switch to START ...

... and discharge starting aid capsule or spray starting fluid sparingly into precleaner while cranking.

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Use starting fluid sparingly. Follow manufacturer's instructions carefully.

10. When engine starts it may be necessary to return HEAT-START switch to HEAT until engine runs smoothly.

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NOTICE
If engine does not start, let starter cool 2 minutes then repeat starting procedure. Never switch to HEAT when engine is warm and running.

Starting With Boost

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Attach ground cable last, and remove first, to prevent sparks from occurring near the battery which could cause battery vapors to explode. Attach ground cable from booster battery to a point away from, and below, the battery on the machine to be started. Attach ground cable from booster battery to starter ground terminal on machines with a battery ground to starter ground cable.

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NOTICE
When using jumper cables be sure to connect in parallel: Positive (+) to positive (+) and negative (-) to negative (-). Remove all filler caps from all batteries before attaching jumper cables.