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 supply- ing 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. |
| 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 1000/454 kg. |
Hydraulic tool will not operate. | Tool circuit lever is OFF. | Turn tool circuit lever ON. |
| Not enough throttle. | Move throttle to FAST position. |
| Incorrect tool/hose connection. | Check for correct connections. |
| 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. |
| Tool is defective. | Refer to tool manual. |
| Relief valve defective | Have machine serviced. |
Machine cannot be moved | Defective gear box(es). | Have machine serviced. |
using hydraulic controls. |
|
|
| One or more defective hydraulic | Have machine serviced. |
| component. |
|
| Hydraulic fluid level low. | Check for correct level. |
| Pump coupling defective. | Have machine serviced. |
| Relief valve stuck open. | Have machine serviced. |
MHP3 Diesel User Manual ◄ 21
