641 & 651 TRACTOR-SCRAPERS Safety Caterpillar

1.1. Preparing to Operate
2.1. Checking Controls
3.1. Mounting and Dismounting
4.1. Operating
5.1. Shipping

Wear a hard hat, safety glasses and respirator as required by job conditions.

Do not wear loose clothing or jewelry that could catch on controls.

Don't rush - be careful.

Block raised bowl and apron if working in this area.

Know the hand signals and who gives them.

Lower scraper and stop engine before servicing.

Do not smoke while fueling.

Preparing to Operate

Report needed repairs.

Be sure machine is equipped with clearance lights and turn signals, if required by law.

Make certain all safety guards and covers are secured in place.

Clear personnel from machine and area.

Clear obstacles from path of machine - note hazards such as wires and ditches.

Start engine only in well ventilated area.

Be particularly careful on machines you do not usually operate.

Fasten seat belt before operating.

Checking Controls

Check all controls for proper operation.

Test engine accelerator.

Test right and left steering while moving slowly.

Test brakes.

Mounting and Dismounting

Do not jump off machine. Use steps and grab irons.

Shut off engine before leaving machine.

Listen for unusual noises.

Move all scraper controls to HOLD or NEUTRAL before starting engine.

Check function of safety devices such as lights, back-up alarms, etc.

Set parking brake before leaving machine.

Always lower scraper bowl and apron before dismounting.


Look behind machine before backing.

Observe all gauges frequently - investigate improper readings.

Stay clear of overhangs, electric wires, slide areas or other danger areas.

Use extra caution in crossing side hills, ridges, ditches and other obstructions.

Use extreme care to avoid tipping when working on hills, banks or slopes.

Stay safe distance from edge of cliff or overhang.

Know traffic pattern of the job and obey flagmen, road signs and signals.

Match speed with job conditions - do not coast.

Know your stopping distance at any given speed. Regulate travel speed accordingly.

Keep machine under control - do not try to work machine over capacity.

Make sure clearance flags and other required warnings are on machine when roading.

Stop machine frequently at night - walk around and inspect machine - stay alert.

Report needed repairs noted during operation.

No riders.


Use extreme care to avoid slipping if loading dock or ramp has ice, snow, grease or oil on it.

Remove ice, snow or other slippery material from truck bed, before loading, to avoid load slipping in transit.

Block and tie tractor and scraper securely.

Observe all safety regulations governing wide loads.

Check with authorities for weight limits and overhead clearances of proposed route.