Fixing the auto-return on a hydraulic control valve usually is just a matter of tightening The bolt inside the detent cover assembly. This tutorial apply to the Energy control valve. This valve is the most prevalent valve used in the residential log splitter industry.

The detent cover on the hydraulic valve controls the auto-return
The detent cover on the hydraulic valve controls the auto-return

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  • What does the detent on a hydraulic control valve do?
  • How to adjust the detent.
  • How to replace the detent.
  • Where to buy a replacement detent part.

What does a detent on a hydraulic valve do?

The detent on a hydraulic valve controls automatic return features. For example, on a log splitter, it allows for the auto return of the hydraulic piston. This allows you to get the next log to be split ready while the piston is returning to the start position. If the detent isn’t working correctly you will have to hold the hydraulic control lever in the return position until the cylinder gets back to the start position. This is inconvenient and can nearly double the time it takes to split wood if you’re working alone.

How to adjust the detent.

To adjust the detent you must first remove the detent cover. It is held in place by 2 hex bolts.

Detent cover with 2 hex bolts holding it in place
The 2 hex bolts hold the detent cover in place

Once the detent cover is removed you’ll be able to access the detent assembly. At the top of the assembly, you can see a slotted cylinder. This is the adjustment bolt for the detent.

In this picture, the bearing at the top center of the slotted cylinder is missing. You will see a bearing when you remove the detent cover.

When you tighten this bolt the detent will hold the control valve lever in the return position more tightly. When you loosen this bolt the detent will hold the lever in position less tightly until it won’t hold it at all.

If you control lever won’t hold into the automatic return position 9 times out of 10 you just need to snug this bolt down with a couple 1/4 turns.

Replace the detent cover and give it a try. You are more than likely all fixed up at this point.

If tightening this bolt down doesn’ fix the problem then you’ll need to replace the detent and detent cover altogether. This is also very simple.

How to replace the detent

Here is a link to find the replacement detent and current prices on Amazon.

Once again, you need to remove the detent cover. Then unscrew the adjustment bolt all the way. this will remove the detent assembly from the hydraulic control valve.

Detent assembly base
Be sure to wipe away all oil and debris from the detent base before installing the new detent. DO NOT use a scraper or anything that can gouge the base. This could cause a hydraulic leak.

When the new detent arrives it will be shipped with the detent assembly already assembled and set inside the new detent cover.

Replacement detent assembly with detent cover
Detent cover assembly shipped preassembled.

The detent assembly will have to be removed from the detent cover.

CAUTION: Do this very carefully. When sliding the detent assembly out of the detent cover don’t allow the assembly to come apart. There are small bearings inside the detent assembly that are held in place by the detent sleeve

Detent assembly showing how detent sleeve can slide up
DO NOT allow the detent sleeve to slide up and out of place.

Thread the detent into the base threads of the control valve. Tighten it down all the way by hand making sure not to allow the threads to get crossed. Once in place snug down the assembly with a large slotted screwdriver.

New detent assembly installed
New detent assembly installed. Pack the top bearing with grease if it wasn’t greased by the manufacture.

Now it’s time to screw on the new detent cover and try it out.

You may need to tighten down the slotted sleeve more if it isn’t holding the control lever into the return position.

Use the comment section below if you have any questions. I respond daily to comments.


auto-return, hydraulic control valve, hydraulic detent, hydraulic repair, log splitter, repair

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