1. D500 HP Hydraulic Air Pump
2. Troubleshooting
3. Troubleshooting

Troubleshooting

If for any reason the pump does not run properly, look for one of the following causes:

• If the pump appears to be short stroking and running too fast without pumping properly, it usually indicates that the pilot valve assembly is not working as it should. Refer to instructions for the he hydraulic piston and repairing of the pilot valve assembly.

• Loss of pressure may be caused by one of two reasons; the hydraulic check valve have developed a leak or the hydraulic fluid is bleeding past the packing in the hydraulic cylinder. Replace the packing in the hydraulic cylinder or repair/replace the hydraulic check valve.

• Should the pump run erratically and in a jerky manner after a period of time, it is usually an indication of seizing in the hydraulic piston and cylinder assembly. Refer to instructions on how to disassemble the air motor and to replace the packing in the hydraulic cylinder. If the hydraulic piston and cylinder have not been damaged, a thorough cleaning will normally put the pump back into operation mode again.

• To ensure hydraulic fluid flow is optimized, ensure sufficient air volume is supplied to the pump. Hooking the pump up to a smaller pipe size than the “AIR IN” port on the pump will not allow it to run at its full rated capacity. Long runs of relatively small pipe supplying air to the pump will have the same effect.

• If an excessive amount of oil or water is pouring through the pump air exhaust, check for and correct;

  • Lubricating unit in the air supply is delivering too much oil. Adjust to about one drop of oil for every 20 strokes of the pump.

  • The hydraulic fluid being pumped (oil or water) may be leaking past the packing in the hydraulic cylinder into the air motor. Replace the packing in the hydraulic cylinder.