My loader quit working again and now I think that I understand what has been the problem. Thanks to the comments from BILLBILL, I noticed that after the loader failed to operate, I moved the 3ph lift lever and all of a sudden the loader was working again. I had not realized that there was a connection between the 3ph valve and the loader. If I understand the system now, I think that the FEL pump also drives the 3ph lift. It appears to me that fluid from the FEL pump flows through the controls valves for the loader and then it goes through the valve for the 3ph lift control. The lever that controls the 3ph lift normally returns to a neutral position when the lift is raised. It appears that sometimes it is sticking and not going back to the neutral position. I think that when this happens, the fluid from the pump can not return to the reservoir because it is blocked by the 3ph valve and so the loader fails to operate. Does this sound plausible?
DF-354 Dongfeng Tractor Hydraulic Problem
- Thread starter lp15404
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3RRL
Super Member
- Joined
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- Tractor
- 55HP 4WD KAMA 554 and 4 x 4 Jinma 284
Do you have 2 hydraulic pumps or one? Some models have a separate pump for the power steering like mine. That leaves the other pump to run not only the FEL valve but also the 3pt valve and the rear remote valve (if you have).
What's happening, whether or not the pump goes to the loader valve or 3 pt or rear remotes first, is when any valve is open (like it's being used) there is not enough flow capacity to operate the other valves fully. I can "feather" my FEL valve and operate the new grapple but if I open it up full, I can't....just not enough flow. My hydaulic pumps makes 5.6 gals/min I think. I've tried to operate the FEL vlave and the 3pt valve at the same time and no go. I have not tried "feathering" the FEL to see if the 3pt works then? Too hard to do all that at the same time anyway.
What's happening, whether or not the pump goes to the loader valve or 3 pt or rear remotes first, is when any valve is open (like it's being used) there is not enough flow capacity to operate the other valves fully. I can "feather" my FEL valve and operate the new grapple but if I open it up full, I can't....just not enough flow. My hydaulic pumps makes 5.6 gals/min I think. I've tried to operate the FEL vlave and the 3pt valve at the same time and no go. I have not tried "feathering" the FEL to see if the 3pt works then? Too hard to do all that at the same time anyway.
bluechip
Veteran Member
You can have a situation with a very heavy implement on the 3 point hitch and if the valve is open on the 3 point lift (raise position) back pressure may not let any oil out of the loader, so when you try to raise the loader the oil on the "back side" of the cylinder cang escape, if the pressure is equal, nothing moves. Do you have weight on the 3 point? This can be solved using power beyond so the return line from the loader dumps into the reservoir unimpeded by the 3 point. the power beyond port will be sure that flow is available to the 3 point regardless of loader use, but loader speeds might be reduced by splitting the flow. Even if you don't have weight on the 3 point, if it is trying to lift beyond the stop, the PR valve will be "buzzing" but it may be higher than the PR valve on the loader so again, the loader cant dump oil from the backside of the cylinders. This is an unusual problem as nearly all chinese tractors are plumbed without power beyond.
I have a 6' Bush Hog scraper blade on the rear of the tractor. The blade is pretty heavy. One of the complaints that I have about the tractor is that when I am moving dirt with the blade, I can not raise the blade slowly to gradually level out the dirt. As I start to raise the blade, there is a terrible strain on the engine and the blade does not move until I have pulled back the lever until all of a sudden the blade breaks free and dumps all of the dirt. I am not familiar with the power beyond. I will look into that.
Tractor Nubi
New member
I purchased a DF-354 LD250 loader and LW-7 (plus cultivator) from China directly. I have only had problems interpreting the instructions and the hydraulics but all is working well..I feel the same at the other more seasoned professionals, that the problem starts with the loader. Newman.com New and Used DEC, Proliant, Cisco is where I got all of my parts from... I think that they are a distributor for a number of companies.
Hi
Did you happen to resolve your problem with the FEL hydraulics ?
I purchased a task master 432e (which is a Dongfeng) with a loader new , and the loader exhibits the same problem. When on an incline (pointing up hill), it does not lift well, and if it has a load in it, it will not lift at all. It does work great on the level and pointing downhill. I am beginning to think from what I have read here that this is a problem with the Dongfeng tractor, and I probably should not have been so quick to purchase it. I have not heard of Kama , Kioti, John Deere or any other tractors exhibiting this kind of problem.
Also, the fuel gauge says my tank is half full when it is empty.
Also, it is strange that the people who own the Task Master brand name for this tractor do not ever respond.
Did you happen to resolve your problem with the FEL hydraulics ?
I purchased a task master 432e (which is a Dongfeng) with a loader new , and the loader exhibits the same problem. When on an incline (pointing up hill), it does not lift well, and if it has a load in it, it will not lift at all. It does work great on the level and pointing downhill. I am beginning to think from what I have read here that this is a problem with the Dongfeng tractor, and I probably should not have been so quick to purchase it. I have not heard of Kama , Kioti, John Deere or any other tractors exhibiting this kind of problem.
Also, the fuel gauge says my tank is half full when it is empty.
Also, it is strange that the people who own the Task Master brand name for this tractor do not ever respond.
JohnS
Platinum Member
OKJ, I am not familiar with your tractor or FEL, but would check hydraulic level, and location of the suction pipe within the resivior. If equiped with a tank filter/screen, it maybe severly plugged. Most Jinmas need a good flushing and removal of the original chinese oil. If yours hasn't been done, would recommend that as well.
My biggest problem with the loader was that the 3 point hitch lift lever was sticking and that blocked the hydraulic fluid from the pump from getting back to the reservoir. Once I realized that the 3ph control was the problem, I started making sure that it went back to the neutral position when I released it. As far as not working on a incline, I added more hydraulic fluid and slightly overfilled it.
That seems to help.
That seems to help.
Thanks for the info .
Maybe when I do the 100 hour maintaineance , I can check the filter and hoses. It does get me by the way it is. I will probably question the dealer who sold it to me since he has sold others.
I guess I didn't realize that hydraulics could act this strange.
I only have about 25 hours on it. I do like it so far compared to my 8N . It is real good in the mud , which we have had plenty of in the northeast.
Anyone know if the oil pressure should increase or decrease with increased RPM ?
It goes down on mine and that don't seem to make sense. Perhaps the gauge is wired backward....don't know. May be related to my fuel gauge showing half full when empty.
Maybe when I do the 100 hour maintaineance , I can check the filter and hoses. It does get me by the way it is. I will probably question the dealer who sold it to me since he has sold others.
I guess I didn't realize that hydraulics could act this strange.
I only have about 25 hours on it. I do like it so far compared to my 8N . It is real good in the mud , which we have had plenty of in the northeast.
Anyone know if the oil pressure should increase or decrease with increased RPM ?
It goes down on mine and that don't seem to make sense. Perhaps the gauge is wired backward....don't know. May be related to my fuel gauge showing half full when empty.