Sep `76
Suggestion FR-286-76
4.
Reasons for action taken or recommended.
a. The suggestion advocated the attachment of a cable to the dump truck body's OSHA maintenance struts on the
sides of the CCE-IHC, 71,000 GVWR Dump Truck. This truck is primarily a working tool, the same as a bulldozer. The
interior of the dump body can be compared to the face of the dozer blade, since both are in contact with abrasive earth.
Both surfaces become devoid of any paint, both surfaces become rusty, and, to the best ability of user troops, both should
be kept clean. The dozer blade must be lowered to the ground for safety when parked. The dump body should likewise
be lowered to the chassis for safety when parked. The dozer blade cylinders are hard chrome plated end, as such, are
impervious to corrosion. However, the dump body hoist cylinder has thin chrome plate and, therefore, should be fully
lowered to protect it from rust that will cut the packing glands of the telescopic tubes. The safety aspect includes the
possibility that, in an abnormally high wind gust, the dump body could act as a sail of a boat and tip the truck over.
Therefore, do not use the safety maintenance struts to hoist the CCE dump truck body when parked. These struts are
required by OSHA (49 CFR 1926) for safe maintenance operations requiring mechanics to work under the hoisted body.
Don't worry about inside body rust. The metal thickness is sufficient to give a life-tine of service without rusting out. It has
8-gage sheet metal for the cab protector, sides, and tail gate and 1/4 inch plate on the floor.
b. The dump hoist lever is of the dead man type, in that it is spring loaded into the "Hold" position. It takes a force to
overcome the resistance of the centering return springs on the hoist valve to engage "Lower" or "Hoist" positions. The
lever also has a neutral hold lock to prevent lever movement from hold. The dump body hydraulic hoist system has safe-
guards to prevent other than a split cylinder or blown packing gland from causing. the dump body to fall in case of a
hydraulic failure. On the cylinder is a pilot operated valve that locks the hydraulic oil inside of the cylinder under all
conditions, except when the control valve over-pressurizes the locking springs of the ports to raise or lower the cylinder.
Therefore, the possibility of the dump body coming down by itself would only occur in a freak accident. The hydraulic
system is as safe as practicable.
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