Sep `76
Suggestion 76-D-256
4.
Reasons for Action Taken or Recommended.
a. The suggestion recommends that the hoist cylinder bleed valve be accessible from inside of the dump body
through access plates rather than from the front of the body while personnel lay on the roof of the cab of the CCE-IHC
Paystar F5070 20 Ton Dump Truck, 6x4, 71,000 GVWR. There is no easy, safe method of bleeding air out of the hoist
cylinder.
b. The present frontal approach has the danger of the mechanic getting hit by the dump body target or the cab
protector, if he neglects to use the maintenance safety struts and a long 4x4 minimum size timber located near the body
pivot pins, so that the body's descent must stop prior to danger.
c. The suggested in-body approach can be even more dangerous. The mechanic has no handholds or step surface
available while the body is being raised. Such steps and grab handles would be soon rendered useless as a result of
aggregate wear and destruction by rocks. The mechanic could slip and fall from the doghouse to the tailgate, a distance
of 16 feet. In addition, removal of the bleedhole cover plate would be a major problem. In the dump body, users have
had very poor experience in any attempts to have fasteners, that are exposed to aggregate and rocks, remain removable
after periods of use. Capscrews become banged and worn and flush-type fasteners are deformed and can not be
removed.
d. Removal of the body target is not a solution. The body target is the only visual means by which the driver is sure
the dump body is seated on the chassis and remains seated on the chassis during travel.
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