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 flow and pressure as listed in the table. Use a flowmeter known to be accurate. Check the flow with the hydraulic oil temperature at least 80 °F/27 °C.
Problem | Cause | Solution |
Machine will not start. | Fuel filter plugged. | Replace fuel filter. |
| 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 fluid | Hydraulic tank overfilled. | Correct fluid level. |
reservoir vent. | Pump suction leak. | Check suction connections. |
Machine stalls when track | Not enough throttle. | Increase throttle setting/use low range. |
controls are pushed. |
|
|
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 | Check that the flow selector switch is set to 5 or |
| ON. | 10 gpm. |
| Incorrect hose connection to tool. | Make sure the tool hose circuit goes from left |
|
| (pressure) fitting to tool and back to the right |
|
| fitting (return). Fluid always flows from the male to |
|
| female fittings. |
| Quick disconnect fittings. | Detach from hose, connect set together and |
|
| check for free flow. |
| 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 fluid 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. |
20 ► MHP3 User Manual
