Need Help with wood splitter

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Forum topic by okwoodshop posted 11-25-2013 01:15 AM 1073 views 0 times favorited 5 replies Add to Favorites Watch
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448 posts in 3169 days

11-25-2013 01:15 AM

Topic tags/keywords: question

I hope this is the right place to ask about this. My son in law and I recently found a homemade wood splitter that needed work. The motor was in bad shape so we found a good deal on a new one(6.5 hp) Once we got it installed the ram will go forward and back but stalls when it hits the wood. The pump and switch are one piece and painted over so I can’t find any numbers on it. Does this sound like the pump could be bad ? or maybe the fluid? I don’t really know much at all about hydraulics as you can tell. Anyone ever build or repair anything like this?

5 replies so far

View ralbuck's profile


4465 posts in 2260 days

#1 posted 11-25-2013 02:17 AM

It does sound like a bad pump; but it could beas easy as a pressure relief valve set way wrong!

First check fluid level!

Next check the lever(valve) to see that it is not restriced

If these do not help try turning off, disconnecting hoses and looking for blocked/ restricted oil passages.

Ther may be a plugged screen on the intake side that will let it work, but not build pressure.

Next look for a pressure relief valve——- looks like a nut with a set-screw in the middle, can have worked it self loose!

BE VERY careful and on lt! Change these settings a little at a time! You can raise the pressure to far and have VERY unhappy results-even dangerous!

-- Wood rescue is good for the environment and me! just rjR

View patron's profile


13603 posts in 3335 days

#2 posted 11-25-2013 02:18 AM

as you said
the pump could be bad
or it may have lost fluid
and has an ‘air lock’

use only hydraulic fluid
(sold at auto stores)
and make sure to ‘bleed’ the lines
like auto brakes
(maybe an auto bud can help
if you don’t know how)

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Dallas's profile


3599 posts in 2481 days

#3 posted 11-25-2013 02:27 AM

Sounds like air in the lines.

Bleed Bleed Bleed Bleed until you can bleed no more.

Save the fluid you bleed out, you can add it back.

-- Improvise.... Adapt...... Overcome!

View crank49's profile


4030 posts in 2965 days

#4 posted 11-25-2013 04:11 AM

Many small splitters, with less than 12 hp, have a two stage pump.
With a 6.5 hp motor they might put out 16 gpm (gallons per minute) until the pressure builds to about 500 psi then it shifts to 3.5 gpm and pressure builds up to 2500 psi.

It sounds like yours might be working in the low pressure mode, but going into bypass when the pressure tries to build up to the higher mode.

They make these dual mode pumps so they can cycle fast until they have to built high pressure to split a tough log.

View okwoodshop's profile


448 posts in 3169 days

#5 posted 11-25-2013 02:03 PM

thanks guys, we are going to clean out all the old fluid first and then see what happens with new fluid.

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