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20 ► MHP3 User Manual
TROUBLESHOOTING
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.
When diagnosing faults in operation of the machine or tool, always check that the hydraulic power source is supplying the
correct hydraulic ow and pressure as listed in the table. Use a owmeter known to be accurate. Check the ow with the
hydraulic oil temperature at least 80 °F/27 °C.
Problem Cause Solution
Machine will not start. Fuel lter plugged. Replace fuel lter.
No fuel. Add fuel.
Defective spark plugs. Remove plugs, check gap, clean or replace.
Tool circuit switch is on. Turn tool circuit switch off.
Battery not connected. Attach battery cables, check wires.
Weak battery. Test battery, charge or replace.
Solenoid not working. Check solenoid operation and electrical
connections.
Fluid blowing out of uid
reservoir vent.
Hydraulic tank overlled. Correct uid level.
Pump suction leak. Check suction connections.
Machine stalls when track
controls are pushed.
Not enough throttle. Increase throttle setting/use low range.
Heavy load. Increase throttle setting/use low range.
Over maximum pay load. Max load 1000 lb/454 kg.
Hydraulic tool will not operate. Tool circuit switch is OFF. Turn tool circuit switch ON.
Not enough throttle. Move throttle to FAST position.
Incorrect tool/hose connection. Check for correct connections.
Flow selector switch not switched
ON.
Check that the ow selector switch is set to 5 or
10 gpm.
Incorrect hose connection to tool. Make sure the tool hose circuit goes from left
(pressure) tting to tool and back to the right
tting (return). Fluid always ows from the male to
female ttings.
Quick disconnect ttings. Detach from hose, connect set together and
check for free ow.
Pump coupling defective. With the engine not running: check the coupling
between the pump and engine that it is engaged
and is not damaged. Caution: Keep hands clear
of rotating objects.
Suction hose kinked. Make sure suction hose from uid reservoir to
pump inlet has a smooth curve.
Solenoid not working. Check solenoid operation and electrical
connections.
Tool is defective. Refer to tool manual.
Relief valve defective. Have machine serviced.