LULL 844 TT-34 repairs

1938 Views 6 Replies 5 Participants Last post by Victor1986, Apr 1, 2021

TLink

Discussion Starter · May 29, 2020

An old forklift with a JD engine. Sat for years and I had it running fairly well. Started to slowly operate hydraulics to move to a flat surface and it quit running. Found a fuel leak in the steel return line and welded it up. has new fuel filter and fuel. has hydraulic fluid in resivour. starting fluid will start it but it dies out. Bled the system to the injectors and looks okay. lift pump seems to be okay. I'm trying to get it serviced to place back into use. anyone have an answer?

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HotRodx10

· #2 · May 29, 2020

Could be any number of things, from low fuel pressure or plugged injectors, to a hydraulic pump that's locked up, and dozens more. Assuming it's a diesel, for the engine itself to run, it only needs fuel (under adequate pressure at the right time), air, and compression. If it's being bogged down by something else, that's another issue.

If you can keep it running on starting fluid, most likely either it's not getting fuel, or it's not getting it at the right time.

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TLink

Discussion Starter · #3 · May 29, 2020

Hhummm. As I was warming it up(old John Deere naturally aspirated) it just acted like the fuel ran out. I bled sys well. I did notice the PTO started to whine though!! I'll have to check that. The tank was low and I added some 10W today.
I was planning on pulling injectors to see. at least the #1. Even when you turn key it will run for a few seconds and quit. Not really a big down though. I have fuel at the inj and a good return. So that's what I figure.
1. Injectors
2. Injector pump
3 . PTO

Man it was running good for a while.
Keep me posted on other ideas. I'll let you know
Tim

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DexterII

· #4 · May 29, 2020

Does that really have a PTO? You said it so I'll assume it does, but doubt that it should be running on start up so do you have a clutch hanging up or something else that is not disengaging?

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Bondo

· #5 · May 29, 2020

Ayuh,...... 99 times out 100, if a diesel won't run, it ain't gettin' fuel, 'n air,.....

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TLink

Discussion Starter · #6 · May 30, 2020

Thanks folks. It's got a "pump gear" according to manual. it's like a PTO. I thought if I could disengage it to try starting. Of course fuel delivery is a serious question. Again I'll pull injector #1 for inspection. I had a friend operate hydraulic sys while I walked around. he could have put a load on the sys and I heard the hydraulic gear whine for maybe 5 seconds. When I added fluid today is had some oil but not much. As I cranked it over I had fuel lines cracked up top. It did bleed fuel. Same as the pump. Seems it is getting good fuel through it. Is there a cutoff for the injector pump? Remember it's a 844 TT-34. Old John Deere eng.

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Victor1986

· #7 · Apr 1, 2021

TLink said:
Thanks folks. It's got a "pump gear" according to manual. it's like a PTO. I thought if I could disengage it to try starting. Of course fuel delivery is a serious question. Again I'll pull injector #1 for inspection. I had a friend operate hydraulic sys while I walked around. he could have put a load on the sys and I heard the hydraulic gear whine for maybe 5 seconds. When I added fluid today is had some oil but not much. As I cranked it over I had fuel lines cracked up top. It did bleed fuel. Same as the pump. Seems it is getting good fuel through it. Is there a cutoff for the injector pump? Remember it's a 844 TT-34. Old John Deere eng.

Did you ever solve your problem? I have same thing happening on a old deere diesel now.

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