Hydraulic promblems i think

976 Views 14 Replies 3 Participants Last post by TUDOR, Mar 26, 2019

Tinkerdad

Discussion Starter · Mar 25, 2019

ok, I'm about to pull my hair out. As my name suggests I like to tinker. A while back i picked up what i believe is a cut down ford 125lgt. Someone had made a little buggy out of it. WE bought it, rebuilt the buggy. now after all this time trying to get to move. it won't!!!!!!!!
it has a eaton 1100 hydro pump i believe. I'm at a lose. and i need help. the pump is not froze, tried ATF fluid and Hydraulic oil. Took both pump and rear end apart, to inspect, and cleaned. and nothing is working. Motor cranks and spins shaft but nothing happens.
everything reassembled the way i took it apart.

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Hydronerd

· #2 · Mar 25, 2019

Did it ever work while you had it, or is it possible it wasn't working for the previous owner?

Filling 1100's with oil is a slow process. It should have a small reservoir/expansion chamber. Fill that and check in a couple of hours. If it's gone down add more and check again in a couple of hours.

When oil level is stable; check charge pressure. There's a hydraulic connection near the input (centered on the bottom if vertical) that is the charge suction. There's another smaller hydraulic connection just off of center, near the input shaft that is the charge pressure source. That normally goes to accessories such as the deck lift. It must return to the other connection on the transmission. If there is no deck lift or valves, it still needs to return to the transmission. There is a connection on the cast iron part in the middle of the transmission where the charge oil must return to. You can put a filter in this line. Any valves in this line must be open center. If you are not sure, bypass valves.

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TUDOR

· #3 · Mar 25, 2019

According to tractordata.com, the LGT 125 has a 2-speed final drive. Check that it's not in neutral.

Been there, done that! :banghead3

Tinkerdad

Discussion Starter · #4 · Mar 25, 2019

It is very possible that it did work when we got it, as this is the first time we've messed with trying to get it running. When we got it it was just a modified frame with no motor and just the rear end.
This one has two lines. One coming from the rearend, or sump, to the bottom of the pump and one line comimg out the top going to the side of the pump.

It has a fill plug at the top of the transaxle that I filled up to the mid plug on the back of the transaxle.

Cracking lines lose, I can oil tobthe bottom of the charge pump, but no oil to come through. With the engine idling, I can remove the top hose and no oil comes out.

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Tinkerdad

Discussion Starter · #5 · Mar 25, 2019

That was my thought when we tore into the rearend, all seems to work fine, move shifter in and out for hi and low and no change

Hydronerd

· #6 · Mar 25, 2019

Maybe the rotation is wrong. To test it, use a drill gun and spin it the other way.

The port plate should be installed match the pintle inside the pump. For light use, like a buggy, you could probably change rotation by changing the port plate only to match rotation you need.

Line art Text Design Diagram Illustration

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Tinkerdad

Discussion Starter · #7 · Mar 25, 2019

Hydronerd said:
Maybe the rotation is wrong. To test it, use a drill gun and spin it the other way.

The port plate should be installed match the pintle inside the pump. For light use, like a buggy, you could probably change rotation by changing the port plate only to match rotation you need.
View attachment 2368079 [/QUOT

Thanks for that. I had wondered about that since the engine I have is not the original Koehler. I'll definitely try that once I get back in the shop.

I've been doing research, could it be the acceleration valves inside the center peice in the pump? I did not remove those when I had the pump apart.

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Tinkerdad

Discussion Starter · #8 · Mar 25, 2019

This is how it was when we got it. Other than new paint

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Hydronerd

· #9 · Mar 25, 2019

Ford drive the trans off the flywheel end of engine, not the PTO end; is that how the engine is installed?

Tinkerdad

Discussion Starter · #10 · Mar 25, 2019

Hydronerd said:
Ford drive the trans off the flywheel end of engine, not the PTO end; is that how the engine is installed?

No I don't believe so. It's an aftermarket side shaft engine that came with it.

Tinkerdad

Discussion Starter · #11 · Mar 25, 2019

Hydronerd said:
Ford drive the trans off the flywheel end of engine, not the PTO end; is that how the engine is installed?

This was right after built the adapters for the wheels, driveshaft was built the next day

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Hydronerd

· #12 · Mar 25, 2019

It’s a mud buggy. You’ll have to turn engine around. Why not turn it around and put all the way back above the axle and drive it with a chain.

Tinkerdad

Discussion Starter · #13 · Mar 26, 2019

Hydronerd said:
It’s a mud buggy. You’ll have to turn engine around. Why not turn it around and put all the way back above the axle and drive it with a chain.

Never really thought about doing it that way to be honest.

Tinkerdad

Discussion Starter · #14 · Mar 26, 2019 (Edited)

You really think that after all this time and head ache, it could be that simple as the motor is on backwards?

TUDOR

· #15 · Mar 26, 2019

Yup! Either the flywheel has to face the hydro with a driveshaft connecting, or a chain (or V-belt ) from the engine PTO end down to the hydro if over the axle.

Hydro rotation is counter clockwise when looking at the front of the pump. If the charge pump is rotating backwards, it won't pump fluid.

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