I was using my tractor to help back a truck off of a trailer and had to lift up on the back of the truck and now my loader will not lift or tilt. I still have power steering and the 3 point hitch will go up and down just will not lift weight. Do you think a rebuild of the pump is what is needed or do you guys think I blew a seal ? What about the propotional valve?Any info would be great. Thanks fellas.
loader problems
- Thread starter birddog55
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Diamondpilot
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What tractor is it on and what brand loader? Lets say its a 254/284 Jinma which is most common with the Jinma ZL-20 Loader. The way its plumbed is pump, loader, priority valve, then on to the 3 point and steering. Since you have steering and 3 point you pump is fine. I seriously doubt you blew all the seals in all 4 cylinders.
My guess is a stuck pressure relief valve in the loader valve. It would allow the 3 point and steering to still work. Try taking it apart and cleaning.
Chris
My guess is a stuck pressure relief valve in the loader valve. It would allow the 3 point and steering to still work. Try taking it apart and cleaning.
Chris
It is a jimna 284 and can you point me in the direction on were to start looking. I"m a pretty decent back yard mechanic but hydraulics are something I haven"t really messed with. Like I said 3 point will wok with no weight on them and they have always been a little slow. Thanks
erj
Gold Member
A few questions-
What loader do you have?
Did your loader work OK in getting the truck off the trailer?
When did you notice that the loader was not working?
Are you saying that the 3 point hitch will not lift weight?
Has it lifted weight in the past?
RonJ
What loader do you have?
Did your loader work OK in getting the truck off the trailer?
When did you notice that the loader was not working?
Are you saying that the 3 point hitch will not lift weight?
Has it lifted weight in the past?
RonJ
Affordable
Advertiser, Platinum Member
It could be a weak pump but if all your other hydraulics work,Cris is prob. right if your lifting on the truck exceeded the pressure relief on the loader it could be stuck open.If you look under the loader operation handle you should see a adjustable type valve (has threads on it) for adjusting,take it out but note where it is now to see if there is debris in it
Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company
Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company
Affordable
Advertiser, Platinum Member
We have a 5000 psi gauge that we put inline of the pump discharge we have quick connects on each end to install inline.
Tommy
Affordable Tractor Sales
Tommy
Affordable Tractor Sales
Diamondpilot
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Before you go any farther if you have a spin on hydro filter down by the starter take the filter off and check inside for a broke white plastic piece. The piece in question caused some problems about 2 years ago on a rash of tractors. Its the bypass and it broke and logged itself so there was a restriction. I would check this next. Will not cost you a dime but some dirty hands and time.
Chris
Chris
YukonKing
Bronze Member
I had the same problem on my loader and my backhoe, all jinma brand on a JM254. The pressure relief valves are built in a way that they can bind for what ever reason. I've had to dissasemble and reasemble a couple of times . Nothing is ever broken just out of place.
Diamondpilot
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Quite a few of the bigger dealers will have what you need but I would try checking the pressure relief again as suggested. Very unlikely its your pump since other things are working, especially if you can lift a heavy item with the 3 point like a bush hog if you have one.
Chris
doxford jim
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If your three point hitch works then you have some hydraulic pressure.
Have you checked the controls for the FEL ? The joystick lvere that raises and lowers the FEL. The two shuttle/spool valave that direct the oil flow, can come out of adjustment. Essentially there is a spring that is fitted at the back of the valve which ,akes the valve self centre. If the clamping bolt unscrews and falls out, the valve will be left in it's last position.. So, if the spring fell off when you were lowering the bucket, the valve will continue to send oil for that operation - in short it will not lift.
Take the metal cap off of the back of the valve - once you see the spring you will understand what I am talking about.
Please let us know how you made out.
Jim
What an on point thread.
My '06 Ag King (Jinma) 3450 with Jinma ZL 30, I think FEL with 314 tach hours has just started having the exact same problem. Steering and rear lift work fine. FEL won't lift or bucket won't curl back. Checked HYD fluid lever OK. Have narrowed it down to the FEL control assy. The Hyd pump is working fine.
By the way, I can make the bucket lift but not curl back by holding the steering hard to the right.
My next step is to take the hyd control apart..... Is there a schematic available or what should I do next.
What do you guys suggest
My '06 Ag King (Jinma) 3450 with Jinma ZL 30, I think FEL with 314 tach hours has just started having the exact same problem. Steering and rear lift work fine. FEL won't lift or bucket won't curl back. Checked HYD fluid lever OK. Have narrowed it down to the FEL control assy. The Hyd pump is working fine.
By the way, I can make the bucket lift but not curl back by holding the steering hard to the right.
My next step is to take the hyd control apart..... Is there a schematic available or what should I do next.
What do you guys suggest
Ranch_Hand_Supp
Advertiser
No schematic that I know of. Dont know which loader valve you have ??. You may find some kind of trash around a spool valve ?
I have sold several loader valve up-grade kits for theZL20, ZL30 & ZL40 Cjina loaders.
Jinma Loader Valve
Does sound like its in the valve. That would be my 1st guess.
Ronald
Ranch Hand Supply
SPIKER
Elite Member
I would surmise that the FEL relief valve is open, maybe the spring broke or there is something jammed it open so that pressure cannot build inside the valve and apply pressure to the cylinder to raise/tilt. I had a point where I had to disassemble mine and clean it to get mine back to fully functioning. it would raise/lower its self but couldn't lift any weight. These are adjustable so you have to have a pressure gauge installed to re-setup and or depend on the fact that you can accurately count the number of turns out that is required to take the valve assy apart/remove it for cleaning. I have/had access to a ton of hydraulic parts at place I worked when I set mine back up and installed a gauge to set pressures back up.
I didnt find anything inside the valve that was noticeable to have jammed mine up but it worked fine after I disassembled and cleaned & reinstalled it. I bought a used valve from a guy on old CTOA board who had replaced his for similar reason with the intent of making extra sections onto my FEL valve for a grapple when/if I ever get the time... His valve had a chunk of ?? rubber maybe O-Ring lodged inside it when I took it apart. It was about the size of a grain of sand...
Mark
I didnt find anything inside the valve that was noticeable to have jammed mine up but it worked fine after I disassembled and cleaned & reinstalled it. I bought a used valve from a guy on old CTOA board who had replaced his for similar reason with the intent of making extra sections onto my FEL valve for a grapple when/if I ever get the time... His valve had a chunk of ?? rubber maybe O-Ring lodged inside it when I took it apart. It was about the size of a grain of sand...
Mark
I went ahead and removed the FEL hydraulic control unit (old style), carefully labeled all the hoses and carefully took what I surmised was the pressure relief valve out and lo and behold found a trashed O ring, replaced the O ring re assembled, installed the control assy and Viola, works perfectly.
One of these days I hope to install one of the loader valve up-grade kits.
One of these days I hope to install one of the loader valve up-grade kits.
Diamondpilot
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Good job. Now you can say you fixed your hydros. Not a tough job but many would be afraid to tackle a job like that.
Chris
Chris
SPIKER
Elite Member
Glad you found it, I thought it would have been in the relief valve part. Those are easy enough to work on and probably could have been done on the machine as those simply un-screw form the valve body.
Glad it is fixed.
Mark
