Help Identify Hydraulic Pump

Hello All,

Sorry if this is the wrong place to go for this but I'm am not a member of any other forums and a week worth of calls are leading me to no answers. I have a working hydraulic pump on a homemade wood splitter my dad but some 40 years ago. He is gone now so I dont have the pleasure of asking him, even if he would remember. Its being driven off a Wisconsin THD. I am trying to find out the specs on this pump. GPM and 1 or 2 stage mostly, suggested RPM and pressure to know what I have and what I could do to make the splitter better for several reasons.
I have called Parker/Chelsea spending time on the phone with a product manager, engineer and called one of their local dealers at their suggestion. With numbers and pictures no one can tell me anything about the pump. My last hope was some seasoned hydraulic guy here would know what I have of how to decode the numbers which is what I though you could do with some pumps. Anyway, here is what I have stamped or cast on the pump to the best of my ability to read it with it still mounted.

Chelsea 374
300-2303
A4AA3003
10-FF201-2
TFM21-64




Right knows its slow and has trouble on big rounds of pecan which I split a lot of for wood smoking. Its powering a BIG cylinder. From memory 5.5 OD, 42 long and a 2.5 rod. I dont care about the speed as much as the power.

Thanks in advance

When my splitter got weak, it was the seals in the cylinder itself letting oil pass by.
Had it rebuilt and splits anything again.
Run the cylinder to the end and take off the hose at that end and see if oil is leaking past the piston when you try to push against it some more with the pump.
If so, the packing is bad and your pump is OK.

I wouldn't be surprised it was off a
truck. From what my older brother says,
he built it all from parts around the
farm. He was in vet school and trying to
make some money selling firewood. I had
the cylinder rebuilt a year or so ago.
It still drips a bit under a heavy load.
The old has been changed. Still chasing
a couple leaks in the boxed framed for
the hydraulic tank. It has a canister
screen filter on the section side. It
does fine on regular sized rounds but I
get my pecan from my tree guy. I got
some rounds now that's 44. It's hard to
get it up on the splitter without a lift
and you have to widdle it down a bit at
the time outside in. Lusting for an
Eastonmade 22-28 but repowering with a
predator and a Concentric 2 stage pump
is more budget friendly.

Are you sure the belts aren't slipping?

I taught Chelsea, PTO classes for a number of years and I had some pumps that were 40 years old and none looked like that. Send me an e-mail and we can talk about in more detail