Troubleshooting - National 5600 Instruction Manual

Trouble
1. The scraper does not work
when the pump is generating
pressure
2. The hoses are worn
3. The machine makes an
unusually loud hissing or
whistling noise
4. Oil deposits are evident on the
inner sides of the driving wheels
5. The machine has no power
with the engine running
at 3500 rpm.
6. The scraper does not react
when the motion control joystick
is actuated
7. The hydraulic oil is very
cloudy. Excessive air in the
circuit can cause severe
damage to pump. Stop
machine and repair
immediately!

TROUBLESHOOTING

Possible Cause
a. Severe blockage in wheel
drive motor hoses
b. Wheel drive motors defective
a. Hoses rubbing on components
b. Hose has been exposed to
poor environmental conditions
a. Fluid is passing over relief
valves
b. Air in hydraulic circuit
a. The shaft seals of the wheel
motors worn out
b. Hose fittings are loose
a. Check valve adjustment
b. Check hoses for leaks
See possible cause 5a and 5b
a. Water has entered
hydraulic tank
b. Oil is contaminated with dirt
c. Air has entered the circuit
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Remedy
a. Check hoses for blockage
and replace hose if necessary
b. Call National Service
Center
a. Replace and protect the
hose
b. Replace hose and protect
equipment from poor
conditions
a. If noise is continuous, call
a National Service Center
b. See Trouble 7 and 9
a. Have the shaft seals
replaced by a specialist
b. Tighten hose fitting.
Replace hose or fitting if
necessary
a & b. Contact National
Service Center immediately
Do not operate in this
condition!!
See remedy 5a and 5b
a. Repair tank if necessary.
Drain and clean tank
thoroughly. Change oil.
b. Drain and clean tank
thoroughly. Change oil.
c. Contact National
Service Center