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JDTECH-others : 4030 Q-Range problems

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Pat

02-05-2002 09:17:53




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My dad has a 4030, 154th one made, and the Quad Range trans. He bought it used about a year ago. This summer, while kicking hay, it got to where it wouldn't pull except in Low gear wide open throttle. He limped it home and parked it. I have the serv. man. for it but was wandering if any one has been into one for this problem and could give any tips prior to beginning this job. The tractor shows the same symptoms in all gears For. and Rev. just worse in the higher gears. Seems like possibly the clutch pack or cluth pack system by what I have read in the manual(pre-checkout guess). Any tips or suggestions would be appriciated. Thanks,PAT

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Carl R

02-08-2002 21:47:45




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
The 4030 is kind of an oddball but the Perma-Clutch is the same as its larger cousins. As stated in the other posts, your system pressure should be around 180 psi (diagnostic port marked CLUTCH). You also need to check the lube pressure, which is tested in the LUBE port located on the left side of the transmission near the filter in the filter relief housing. With the oil warmed up to at least 120 degrees F, run the engine just fast enough to make 10 PSI of lube pressure. With the transmission in the TOW position (between C & D range) shift the two speed lever between 1 & 2 and see if there is more than a 3 psi difference in lube pressure. use a 30 psi gauge so the difference will be easy to see. The lower lube pressure indicated the part of the two-speed that is leaking. System pressure is NOT a good way to detect leakage as it takes a BIG leak to drop system pressure noticably. Also note the difference between the lube readings from pushing the clutch in and releasing it--this will check leakage in the traction clutch circuit. Push the clutch to the floor and slowly release it--the lube gauge should dip for a moment and come back up as you release the clutch--if not, the lube reduction valve is stuck and need to be looked at while the tractor is split to fix the two speed. The PTO clutch circuit can also be checked in this manner.

I hope this helps. It is VERY important to get the hydraulic oil AT LEAST 120 degrees to have accurate test results.

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Pat

02-06-2002 09:31:56




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
Thank you all for the help. Hopefully this weekend I can check the press. If the tractor needs to be split (unfortunately, it looks like it may), I will have to wait a few months until my new shop is finished.

Thanks again, Pat



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JDTECH

02-05-2002 20:57:23




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
Ditto on what WTW said. If you have access to a pressure gauge, check clutch pressure at the clutch valve housing on the left side of the transmission case just behind the left front cab mount or the left battery box if it is an open station. There is a plug that has the word clutch beside it. That is where you want to plumb into. Clutch pressure should be approximately 185 psi at 1900-2000 rpms with the clutch pedal released. If you have that, then your hydraulic clutch circuit is probably ok. While you have the pressure gauge in this port, engage the pto and shift the 2-sp. If the pressure drops more than 4-6 psi you have an internal leak in the circuit that has the least amount of pressure. A large enough leak will result in enough lost presssure to allow the clutch to slip and burn up the clutch. However this usually results in a loss of hydraulics elsewhere. If your pressure checks are ok and no loss of hydraulics then you probably have a mechanical malfunction in the clutch as WTW previously said. I once had a customer who used some brand of hydraulic fluid that I had never heard of before that had some chemical or additive in it that dissolved the material that bonds the clutch facing to the metal disks. Good luck with your tractor. If you have any more questions , repost or email me.

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Brokenwrench

02-05-2002 16:58:27




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
Bad sealing rings on hi-lo piston, bad sealing rings on shaft to hi-lo unit, worn clutches in hi-lo, cracked clutch housing, bad o-ring on the valve body.



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WTW

02-05-2002 13:23:36




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
Pat The most common reason the clutch or two speed would slip as you have described is the lack of transmission oil pressure. I notice that you did not say that you had any problem with the any of the hydraulics functions, steering or brakes. If all these hydraulic function seem to be working normal, your problem may be mechanical. The reason being is that the transmission pump supplying the traction clutch and two speed clutch pressure oil to engage also supplies all the oil to the main hydraulic pump after the transmission functions get there oil first. So if the hydraulics are working normal there is a good chance that the oil is also being supplied to the clutches. A test gauge in the clutch test port would verify this. Is there a transmission light on or blinking in the dash? If there is the problem is pressure related but you did not mention it if it is. If all hydraulic, steering and brake functions appear to be normal, my guess for what it is worth without a pressure gauge is that you have lost the clutch lining off the traction clutch disk (two used). I lean toward this rather than the two speed as you said it slips in (all) gears. If it was the two speed (mechanical or hydraulic failure) it would move in either the high or low side and not the other. If you want to share some more information on other symptoms that may be related post them and I will continue to help. I cut my teeth on these old tractors twenty five years ago and they are a walk in the park compared to the new one I write diagnostics for today. Good Luck Dave W.

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Pat

02-05-2002 14:58:11




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 Re: Re: JDTECH-others : 4030 Q-Range problems in reply to WTW, 02-05-2002 13:23:36  
WTW,
Thank you for the reply, great information!

The hyd. lift, brakes, & power steering appear to work fine. Also, there is no light "activity" on the dash (although the dash is broken badly and I hate to rely on the light working). From what I understand, the previous owner had similar problems (several "mechanics" looked at it and worked on it while they had it) and it had been parked for several months. However when we went to get it it moved fine. I performed a 1000 hr. service(all filters, fluids, adj. valves ect...) It was then used several times, mainly pulling a wagon and manure spreader, (In cold weather)with no trouble.

Dad said on the day of trouble(hot weather), It kept getting progressivly worse (in the time period of less than an hour)until it would hardly move.

I sure appriciate the help, next chance I get I will check the press.

Thanks Again, Pat

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dogdad

02-05-2002 09:46:50




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 Re: JDTECH-others : 4030 Q-Range problems in reply to Pat, 02-05-2002 09:17:53  
check transmision oil filter and use John deere trany oil.
could be the two speed is starved for oil. After that could be check value on side of trany.



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Pat

02-05-2002 11:21:58




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 Re: Re: JDTECH-others : 4030 Q-Range problems in reply to dogdad, 02-05-2002 09:46:50  
The Trans. oil and filter was changed about 2 months prior to problem and the level checked OK. I'll Try the tip on the Check Valve. THANKS, PAT



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