Common Log Splitter Problems And What To Do When They Appear

Hydraulic log splitter systems use pressurised fluid to generate the force behind a wedge that splits wood. If your splitter feels weak or isn’t performing as it should, there’s a strong chance something in the hydraulic system (or the splitting setup) needs attention.

Troubleshooting Common Hydraulic Log Splitter Problems

If the log, loading position, and wedge are all in good order, the next step is to look more closely at the hydraulic system. The checks below cover the most common causes of weak performance, slow movement, or unusual behaviour.

Experiencing vibration or shaking when using the log splitter?

Vibration or shaking is often caused by low hydraulic oil or air trapped in the oil lines. Even if the reservoir looks full, air can still enter if there’s a loose fitting, worn seal, or the system hasn’t been bled correctly.

• Check oil level and top up to the recommended mark.
• Bleed the system by opening the bleed valve and cycling the pressure plate back and forth a few times.
• Inspect fittings and valves to ensure everything is secure before running the splitter again.

Losing driving force when splitting wood?

A loss of driving force—especially when the pressure plate also moves slowly—can point to air in the lines or an oil leak. Both reduce effective pressure and flow to the ram.

• Bleed the system (open bleed valve and cycle the pressure plate several times).
• Check for leaks along hoses, fittings, seals, and around the ram.
• Consider temperature: hydraulic oil is more viscous in cold weather, so performance may feel weaker until the unit warms up.

If none of the above resolves the issue, the splitter may require a piston or pump replacement. It’s also worth checking that shipping plugs are correctly in place by disconnecting the hydraulic hoses, removing the plugs, and refitting them properly.

Is the ram returning?

If the ram extends but won’t retract, the nut for the ram may have come off the piston.

With the engine off, hold open the valve and push the ram back in using a narrow rod. If this issue has occurred, it’s best to contact the Flowfit team to discuss replacing the nut and preventing further damage.