National Flooring Equipment 5625, Service Manual

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Troubleshooting Guide
Problem Cause Solution
Scraper does not work when pump is gener -
ating pressure.
Severe blockage in wheel drive motor hoses. Check hoses for blockage and replace hose
if necessary.
Wheel drive motors defective. Call NFE service center.
Hoses are worn. Hoses rubbing on components. Replace and protect hose.
Hose has been exposed to poor environmen -
tal conditions.
Replace hose and protect equipment from
poor conditions.
Machine makes an unusually loud hissing or
whistling noise.
Fluid is passing over relief valves. If noise is continuous, call National service
center.
Air in hydraulic circuit. Check all suction lines; tighten all hose con -
nections.
Call NFE service center.
Oil deposits are evident on the inner sides of
the driving wheels.
The shaft seals on the wheel motor is worn
out.
Replace wheel motor.
Hose fittings are loose. Tighten hose fitting. Replace hose or fitting if
necessary.
The machine has no power with the engine
running at 2,950 RPM.
Check the valve, love joy coupler on pump,
handle hardware, and for hose leaks.
Contact NFE service center immediately. Do
not operate in this condition.
The scraper does not react when the motion
control joystick is actuated.
Check the valve, love joy coupler on pump,
handle hardware, and for hose leaks.
Contact NFE service center immediately. Do
not operate in this condition.
The hydraulic oil is very cloudy. Excessive
air in the circuit can cause severe damage to
pump. Stop machine and repair immediately!
Water has entered the hydraulic tank. Repair tank if necessary. Drain and clean
tank thoroughly.
Oil is contaminated with dirt. Drain and clean tank thoroughly. Change oil.
Air has entered the circuit. Contact NFE service center.
Excessive amount of oil on the chassis. Outside oil spilled on chassis. Clean machine thoroughly and see if oil
returns.
Loose hose connections. Check for loose hoses.
Loose tank fittings. Check for loose fittings.
Low fluid level. Check fluid level and replace.
Hydraulic oil and/or oil foam leaking from the
oil tank.
Oil level is too high. Drain tank to correct level.
Oil level is too low. Fill tank to correct level.
Vent in return filter blocked. Check for blockage.
Excessive air in the circuit can cause severe
damage to piston pumps.
Stop and repair! Check all suction lines.
Tighten all hose connections and fittings.
Engine dies or cuts out. Fuel tank is empty. Change or fill fuel tank.
Oil is low. Fill oil to proper level.
Operator is not seated properly. Position on seat correctly.
Red ignition light stays on. Oil is low. Fill engine oil to proper level.
Machine is overheating. Let engine cool. Add coolant to proper level.
Machine doesn’t start. Machine needs to be primed. Press primer button once; restart machine.
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