621F Wheel Tractor-Scraper Caterpillar

Illustration 1	g00303714

The auxiliary start receptacle is located at the front right side of the tractor.

Some Caterpillar products may be equipped with auxiliary start receptacles as a standard part. All other machines can be equipped with a receptacle for parts service. Then, a permanent receptacle is always available for jump starting.

Two cable assemblies are also available in order to jump start the stalled machine from another machine that is also equipped with this receptacle or with an auxiliary power pack. Your Caterpillar Dealer can provide the correct cables for your application.

1. Make the initial determination of the machine's failure to crank. Refer to Special Instruction, SEHS7768, "Use of 6V-2150 Starting Charging Analyzer Group". The procedure is applicable even if the machine does not have a diagnostic connector.

2. Move the transmission control of the stalled machine into the NEUTRAL position. Engage the parking brake. Lower the attachments to the ground. Move all controls to the HOLD position.

3. Turn the engine start switch on the stalled machine to the OFF position. Turn off all accessories.

4. On the stalled machine, turn the battery disconnect switch (if equipped) to the ON position.

5. Move the machine that is being used as a power source so that the jump start cables can reach the stalled machine. Do not allow the machines to contact each other.

6. Stop the engine on the machine that is being used as a power source. If you are using an auxiliary power source, turn off the charging system.

7. On the stalled machine, remove the dust cover. Connect the appropriate jump start cable to the auxiliary start receptacle.

8. Connect the other end of the jump start cable to the auxiliary start receptacle that is on the power source.

9. Start the engine on the machine that is being used as a power source. If you are using an auxiliary power source, energize the charging system on the auxiliary power source.

10. Wait for a minimum of two minutes while the batteries in the stalled machine partially charge.

11. Attempt to start the stalled engine. Refer to Operation and Maintenance Manual, "Starting Above 0° C (+32° F)" for the correct starting procedure.

12. Immediately after you start the stalled engine, disconnect the jump start cable from the power source.

13. Disconnect the other end of the jump start cable from the stalled machine. Replace the dust covers.

14. When the engine is running and the charging system is in operation, conclude the failure analysis on the starting charging system of the stalled machine, as required.

15. Severely discharged batteries will not fully recharge from the alternator alone after you jump start the machine. The batteries must be charged to the proper voltage with a battery charger. Many batteries that are considered to be unusable can still be recharged.