641B & 651B TRACTOR-SCRAPERS Safety Caterpillar


Block bowl and apron before changing cutting edge or routing bits.

Lower bowl and apron before servicing tractor-scraper.

Use a self attaching air chuck and stand behind tread when inflating tires.

------ WARNING! ------

With a lack of wheel coolant, improperly used or dragging brakes can generate enough heat to burn the tire bead. A burning bead produces gases inside the tire. The gases can explode, blowing the tire, rim, and parts of the wheel or final drive as far as 300 ft. (90 m).

If smoke, excessive heat, smell of burning rubber or hot brakes, or other indications of bead burning are noticed, move the machine to a remote area. Do not allow personnel within 500 ft. (150 m) of the machine until the tire cools. Four to eight hours may be required to cool the tire.

With a lack of wheel coolant, the brakes can generate enough heat to burn the tire bead. A burning bead produces gases inside the tire than can explode, endangering personnel within 300 ft. (90 m).


Do not attempt adjustments while tractor-scraper is moving or engine is running.

Use caution when removing radiator cap, drain plugs, grease fittings or pressure taps.

Wear safety glasses and shoes as required.

------ WARNING! ------

To avoid possible weakening of the ROPS (Rollover Protection Structure), consult a AVSpare dealer before altering the ROPS in any way. The protection offered by the ROPS will be impaired if it has been subjected to structural damage or has been involved in an overturn incident.


Do not allow unauthorized personnel on machine when it is being serviced.

Store oily rags and other combustible material in a safe place.

Promote good housekeeping. Keep tools and work area clean.

Do not attempt repairs you do not understand.

Operate engine only in well ventilated area.

Do not smoke while refueling.

Replace or repair broken or damaged equipment. Use proper tools.

Attach tags to controls while tractor-scraper is being serviced.

Turn disconnect switch OFF and remove key before servicing electrical system.

Read warning and caution information provided on the tractor-scraper. Follow servicing instructions carefully.