Symptoms
- Ram moves very slowly or not at all
- Splitter struggles on wood it used to split easily
- Jerky or uneven ram movement
- Hydraulic fluid visibly low or leaking
Likely causes
- CommonLow hydraulic fluidInsufficient fluid reduces the pump's ability to build pressure.
- CommonAir trapped in the hydraulic systemAir causes spongy, weak, or jerky ram movement.
- PossibleControl valve not fully engagingA worn or dirty valve may not direct fluid properly.
- PossibleWorn hydraulic pumpInternal wear reduces the pump's ability to build pressure over time.
- PossibleExternal hydraulic leakA leaking hose or seal loses pressure needed to split.
What to do
- Check the hydraulic fluid level with the ram fully retracted and top off with the manufacturer-specified fluid.
- Inspect hoses and fittings for visible leaks or wet spots.
- Bleed air from the system by running the ram fully out and back several times with no load.
- Check the control valve lever moves fully and smoothly through its range.
- Inspect the filter screen (if present) for clogging.
- Warm the engine and fluid up before testing on a hard piece of wood.
- If pressure is still weak after fluid and air are addressed, the pump likely needs professional service or replacement.
Tools and parts
- Hydraulic fluid
- Funnel
- Rags
Hydraulic fluid for log splittersSearch: “log splitter hydraulic fluid”
Hydraulic hoseSearch: “log splitter hydraulic hose replacement”
When to call a pro
If the pump is worn internally, a hydraulic equipment repair shop can rebuild or replace it.
Safety
Use caution
Keep hands clear of the ram and wedge at all times, and relieve hydraulic pressure before disconnecting any lines.