Nov 1976
CCE DUMP TRUCK PTO OPERATION
1. There is a report of breakage of the PTO-to-hoist pump drive shaft on the CCE-IHC Paystar F5070, 20-Ton Dump
Truck. These shafts are highly susceptible to damage by both commercial and military users, therefore, the proper PTO
method of engagement, as cited in the manuals and expanded herein, must be emphasized. Otherwise, when the PTO
drive shafts are under heavy loads, such as the dumping cycles, they will shear and deadline the truck.
2.
Operators must be cautioned to do the following, in operating the hoist system:
a.
Idle the engine.
b.
Step on and hold the service brake treadle or pull out the emergency parking brake, yellow diamond shaped
knob.
c.
Shift the powershift transmission into any gear, stalling the torque convertor.
d. Switch "ON" the PTO air control lever to engage the sliding PTO driven gear to the transmission drive gear. The
red PTO lamp will come "ON", indicating that the PTO has shifted into gear with the transmission. If it doesn't, see step
"e" and "f" below. (Caution, don't speed up the engine yet and don't move the hoist control from its locked, neutral
location).
e. Ease off and reapply the brakes to rotate the transmission gears, thus making sure that the pressurized PTO air
cylinder shifts the PTO driven gear into full mesh with the transmission driving gear (and that the two gears are NOT just
tooth-to-tooth contact, waiting to mesh).
f. Shift the powershift transmission into " N" (neutral) and listen to the sound of the engine and pump being
underload. Shift the transmission back into gear, if the noise feedback indicates gear clashing from the PTO and
transmission gears. Repeat as often as needed to insure gear engagement and get the red light "ON".
g. Then and only then should you first move the hoist control valve lever from neutral (don't forget to release the
safety lock) and accelerate the engine for hoist operation. The manual suggests that you not exceed 1500 engine RPM,
but this engine RPM should be an operator's mandatory
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