GROUND FORCE 717H01, Руководство по эксплуатации и техническому обслуживанию

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WATER TRUCK TROUBLESHOOTING
PROBLEM CAUSES SOLUTIONS
HYDRAULICS
The w
at
er pum
p/mo
tor is
running t
oo slo
w.
There is low hydraulic flow to the
water pump motor.
Check the hoist pump’s inline pressure filters. Check for a
dirty filter, and replace filter cartridge as needed.
Check the pressure and flow on the hoist pump. Excessive
contamination or metal particles in the filter 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 fluid coming from the hydraulic mo -
tor. If flow is above 2 GPM, the hydraulic motor is failing.
The water pump motor could be bad even if the case drain
flow is less then 2 GPM.
The pum
p is har
d t
o 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 fill chute so precipitation does not enter
the tank. If the truck needs to have water in it (for fire pro -
tection for example), store the truck in a warm building.
The w
at
er pum
p is
har
d t
o 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 filling 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 h
ydraulic syst
em is
ov
er
heating.
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 fluid paths in
the manifold. Replace as needed.
48
TROUBLESHOOTING