GROUND FORCE 717H01, Operation & Maintenance Manual, Page: 44 / 57

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WATER TRUCK TROUBLESHOOTING
PROBLEM CAUSES SOLUTIONS
WATER PUMP
The w
at
er pum
p mo
tor is turning,
but does no
t pum
p w
at
er
.
The pump shaft or coupler is
broken.
Replace the shaft or coupler.
The coupler is not aligned
correctly.
Correct the alignment. Refer to the Ground Force water
pump parts drawings in the Parts and Schematics Manual.
The operator is turning the
pump on/off at high RPM,
causing damage to the pump.
Replace the bad pump, coupler and/or motor as needed.
Train the operators that the water pump should only be
turned on at idle speeds. This can cause too much startup
and shutdown torque on the water pump, coupler, and
hydraulic motor.
The water pump hydraulic motor
has failed.
Replace the hydraulic motor. Refer to the Parts & Sche-
matics Manual as well as the water pump manufacturer’s
manual.
The water pump has a plugged
impeller and/or volute.
Disassemble the water pump and remove any debris from
the volute and impeller. Clean debris from the bottom of
the tank. Pay special attention to the water pump suction
screen in the bottom of the tank.
Replace water pump if necessary.
Water pump bearings are noisy
or have seized.
Replace the water pump or the shaft, seals, and bear-
ings, check the manufacturer's manual for the lubrication
requirements.
W
at
er pum
p
seals are leaking.
Loose seal packing. The water pump seals are designed to have some leak-
age, about 1 drop per second. Refer to the manufacturer
manual for instructions to correctly adjust the seals.
44
TROUBLESHOOTING