Apr 1977
HOIST SYSTEM HYDRAULIC OIL FILTER AND RESERVOIR
Users of the CCE-IHC, Paystar F5070, 20 Ton Dump Truck have been experiencing failures of the reservoir inlet pipe and
oil filter support bracket. These items provide the mounting for the return line oil filter. The method of mounting and
weight of the filter and its hose, cantilevered out from the reservoir, imposes too much load on the pipe and bracket to
withstand the shock and vibration of dump truck service.
The pipe and support bracket can be reinforced to support the oil filter or the oil filter can be relocated onto the truck frame
to alleviate the problem.
To support the oil filter in its existing location, fillet weld vertical gussets of the triangular type, between the pipe and the
lower reservoir head sheet. Weld one gusset on the inner side pipe radius and one on the outer side pipe radius to stiffen
the pipe primarily from up and down vibration and secondarily from transverse horizontal vibration. One, single gusset,
under the pipe, won't provide sufficient side-to-side support for the heavy oil filter, so twin parallel gussets are needed.
Next reinforce the old or make a new support bracket for anchoring the oil filter housing to the reservoir tank. Since the
truck frame and the reservoir do not vibrate together, do not mount this bracket to the frame or to the frame mount of the
reservoir. Instead, weld the support bracket to the top of the reservoir tank head sheet and bolt the oil filter housing to the
bracket. Near the oil filter end of the bracket, intentionally add vertical gussets so that mechanics cannot use the oil filter
as a step surface to support their weight.
To relocate the oil filter to a new location, be sure to choose a place and method that will not interfere with the air flow
around the frame mounted air drier for the air brake system. This air drier is just ahead of the hoist reservoir and needs
all the air flow it can get to cool the hot, compressed air from the air brake compressor and take out the moisture before
the flow into the first air reservoir. Obstructions and brackets near the air drier will cause it to run hot and increase truck
air brake maintenance. Also keep in mind, the fact that sharp hose bends and 90P fittings in a hydraulic
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