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 | Doug
Join Date: Posts: 1 
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2001-08-06 30694
Yesterday while working with my loader(7308)it started dumping slowly when I moved the control to the right for regular dump,and when I move it to the extreme right(which should be for fast dump)it rolls back instead.Also I have no down force for back scraping. All day it was working fine,when i would backscrape it would lift the front tires off the ground,now it has no pressure at all.Fluid level is ok and there is no sign of any leaks.Any help would be great.Thanks
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| Mark E. Lamprey
Join Date: Posts: 1
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2001-08-06 30701
Doug, I have never operated a 7308 loader but I would beleive that control wise the all should be very similar. If it is a single lever control then moving the lever either left or right would dump the bucket, the opposite direction would curl the bucket back up. I have no knowledge of a fast dump position, although it may exhist, maybe one of the other readers can help you on that one. When you are trying to back drag, are you pushing the lever to far forward, past the detent, and into the float position ? Hope this helps you.
Mark ....
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| Jeff B
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2001-08-06 30724
Doug, I have a similar problem with the 7308 on my TC33D. After loading the bucket, when I push the lever to the fast dump position, the bucket either doesn't move for several seconds or curls up very slowly for a few seconds. Then the loader goes ahead and dumps. Once the bucket has dumped, or any time with an empty bucket, the fast dump works fine. I took it to the dealer and the mechanic said it was a "feature" of that particular loader. If anyone knows of a fix, I too would appreciate the help. I thought about calling NH Customer Service for additional help, but the last time I contacted them, it became obvious that the people answering the phone don't know the equipment. They just call my dealer for his advice and then say that the regional representative will call me within 3-5 days (he never called). And they won't give me the contact info so I can call the regional rep myself (because it isn't part of their predefined customer service process). - JeffB ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-08-07 30725
It sounds a lot like there's little pressure from the pump. If the tractor has a hydraulic manifold block/diverter valve, I'd check to make sure the diverter valve is fully in the auxiliary position. Then, I'd see if the 3ph has power. I'm making an assumption here that the set up is a common one where the loader SCV outlet feeds back into the remote high-pressure line to the 3ph. If the 3ph also has little power, the problem is likely the pump, pressure relief valve or suction line/filter. If the 3ph has power, then the problem is likely in the loader SCV. If the loader is plumbed behind the 3ph, then I’d ensure that the 3ph isn’t in lift mode and that the pressure relief valve isn’t open. If a gauge is available, pressure tests at several points in the system may shed some light on the problem. I’m sure full of ‘if’s’ this morning. Must be the heat here. If it wasn’t so hot, maybe I’d get something done. ....
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| Stephen R. Cebenko
Join Date: Posts: 1
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2001-08-07 30733
Doug & Jeff B,
I just test drove the 29D/33D last Thursday. When I went through the motions with the empty loader, (they don't let you scratch the paint on the new ones) it made all kind of weird noises. The salesman said this was normal, something like a speed governor. Does this sound familar? ....
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| Doug
Join Date: Posts: 1
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2001-08-07 30747
My 3ph is working fine. Does your bucket have any down force because mine don't.It was working perfectly earlier that day. Called my dealer and they suggested checking my quick connect couplers to see if one might be bad.Does anyone know where the pressure relief valve is located? ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2001-08-07 30750
It sounds like there is a SEVERE cavitation problem in that loader, the lack of down-pressure and the 'bounce' (rolling up before dumping) is caused by a large amount of air trapped in the system. Try this simple test. Place the machine on a flat, level surface, in a safe location to cycle the loader through the full range of it's motion. Start the tractor and (after it's a little warm) bring the rev's up to about 2000rpm and leave them there. Now SLOWLY raise the loader all the way up, at the end of it's lift, lower it VERY SOWLY to the ground. Repeat this whole raise / lower cycle two or three times. Next, do the same painfully slow cycling with the bucket 's entire range of motion. Now re-test the down-pressure of both the bucket and boom circuits. If they now operate normally the problem is only cavitation, which is easily (and cheaply) cured. Best of luck. ....
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| Jeff B
Join Date: Posts: 1
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2001-08-07 30762
My 3ph has been working ok too. I can get down force on the loader. However, its only enough to barely lift the front end when I have the engine runnning at full rpm. Its been that way since the tractor was delivered. Quick connect couplers are in good shape. No noises out of the ordinary. I'll try Murf's cure as soon as it stops raining. - JeffB ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-08 30767
The pressure relief valve position varies. On my Ford 1710, it is part of the hydraulic manifold diverter block that is mounted of the lower right side of the engine. The high-pressure line goes from the pump/priority valve to the manifold block. In a normally operating system, the relief valve opens a bypass line back to the sump when a set pressure is exceeded. The valve operates to prevent damage to the system from excessive pressures due to high loads or line obstructions. When the relief valve is open, a squeal can be heard. That's a good sound to recognize, because a tractor shouldn't be operated too long with the relief valve open. Relief valves sometimes break, which results in low pressure, and the squeal may then not be heard. A 3ph as well as loader would have little power if the relief valve were broken. If the 3ph's are OK, Murf's suggestion is a good place to start. He describes an extreme form of 'cycling,' which is also how new cylinders are charged from tractor hydraulics. If air is the problem, it should be expelled to the return lines and sump, where it bubbles out of the oil. With a properly working system, you should be able to hear the relief valve open when holding the control valve open at the end of cylinder travel. That's a good indication that things are working OK. Regarding down-pressure: My loader produces very little down-pressure when the bucket is flat. When I want to raise the front wheels, I have to angle the bucket down. That’s not an especially desirable feature, but that’s the way some loader frames work on some tractors. ....
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| New2Blue
Join Date: Posts: 1
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2001-09-22 31963
Doug, I have about 25 hours on my TC29D and for the first time today I had the experience of the bucket curling back instead of dumping. It happened twice. I remembered reading about the problem (when I was trying to decide what to buy) but couldn't remember the solution.
Was Murf's suggestion able to solve the problem or are you still trying to determine the cause? ....
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