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WATER TRUCK TROUBLESHOOTING
PROBLEM CAUSES SOLUTIONS
HYDRAULICS
The water pump/motor is
running too slow.
There is low hydraulic ow to the
water pump motor.
Check the hoist pump’s inline pressure lters. Check for a
dirty lter, and replace lter cartridge as needed.
Check the pressure and ow on the hoist pump. Excessive
contamination or metal particles in the lter may indicate
a worn hoist pump. Replace a bad or weak hoist pump as
required.
The water pump motor is weak. Check the case drain uid coming from the hydraulic mo-
tor. If ow is above 2 GPM, the hydraulic motor is failing.
The water pump motor could be bad even if the case drain
ow is less then 2 GPM.
The pump is hard to turn.
The bearings are worn out. Replace the shaft/bearing and install new seals. Grease
the bearings if equipped with serviceable bearings.
The packings on the water pump
are too tight.
Loosen the packing on water pump until you get about 1
drop per second.
The water pump has debris in
the pump keeping the impeller
from turning.
Clean the debris from inside the pump as needed. Check
the plumbing for rocks or other debris. Clean the sump
screen, piping and vortex breaker as needed.
Cold weather has caused
water in the pump to turn to
ice preventing the pump from
turning.
Thaw out the truck. Drain any water before parking the
truck, cover the ll chute so precipitation does not enter
the tank. If the truck needs to have water in it (for re pro-
tection for example), store the truck in a warm building.
The water pump is
hard to prime.
An air pocket is trapped in the
water pump, so the impeller is
not able to move the water.
Open the water cannon valve while lling the water tank.
Close it again before starting the water pump.
Add a small hose from the top port of the water pump.
Route the other end of the hose through a bulkhead back
into the water tank.
Position the truck on an incline facing uphill. Turn the wa-
ter pump on and off as needed to prime the water pump.
The hydraulic system is
overheating.
A hydraulic component(s)
is defective and generating
excessive heat.
Use an infrared temperature sensor to determine the heat
source. Example: The hydraulic oil temperature when exit-
ing the manifold assembly is about 10% higher than where
it enters manifold. Something within that manifold may
be the cause of the heat. Adjust or replace the cartridge
that is producing heat. Usually, the heat is from a pressure
relief valve needing adjustment or replacement.
A valve is stuck, a seal has gone
bad, or there is dirt or etched
hydraulic paths in the manifold.
Check the cartridges for wear, dirt and sticking valves, and
clean or replace as needed. Check the inside of the mani-
fold for hydraulic etching past seals causing uid paths in
the manifold. Replace as needed.
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TROUBLESHOOTING
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