621B TRACTOR-SCRAPER Safety Caterpillar

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

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

Block raised bowl and apron if working in this area.


Lower scraper bowl and stop engine before servicing.

Know the hand signals and who gives them.

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

Do not smoke while fueling.

Preparing to Operate

Report needed repairs.

Be sure machine is equipped with clearance lights 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.

Checking Controls

Check all controls for proper operation.

Test right and left steering while moving slowly.

Listen for unusual noises.

Test brakes.

Test engine accelerator.

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

Always lower scraper bowl and apron before dismounting.

Set parking brake before leaving machine.


No riders.

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 for edge of cliff or overhang.

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.

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

Report needed repairs noted during operation.

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

Mounting and Dismounting

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

Shut off engine before leaving machine.

Move all controls to HOLD or NEUTRAL before starting engine.