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Author Topic: Diff lock, axle lock 4wd issues  (Read 1804 times)

frederick

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Re: Diff lock, axle lock 4wd issues
« Reply #13 on: February 19, 2017, 12:22:39 PM »
i have a belarus 102 and it sounds like it is slipping in the same way. but my front drive shaft goes from the rear to the front with nothing like you have in the pic. i did ask this on the older tractor thread but also thought i would try here. for some ideas. if i understand correctly. the clutch should be towards the front diff on the tractor. im just wondering if mine possibly could be different.


Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #12 on: October 09, 2016, 06:57:57 AM »
The brakes had been sticking, so I stripped the brakes, cleaned em, changed the balls, and reassembled. A breeze to do..or so I thought.....


Trying to bolt the outer casing with the oil line that goes over the diff lock on, the case felt like it was stuck on the difflock, although the difflock axle seems fully pushed into the hollow brake axle (but it obviously cant be)  I have taken it apart and put it back on about 10 times. Checked I hadnt accidently muzzle loaded a rag into the axle. I can "feel" both toothed brake discs in the difflock go onto the brake axle but it still seems about 10mm to far "out".


Any ideas? I might put a dob of grease in the end of the difflock to check its seating, and check the axle itself cant be moved like the one on the other side can. But am running out of ideas






Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #11 on: September 11, 2016, 07:01:00 AM »
 I managed to do the work on the slip clutch a few weeks back. (but only able to test it this morning, it worked great!)


 If I was to do it again, it would have been great to be able to lift the front wheels up (my front end loader didnt have the power which is another issue I have to work on and it was to far from access to drag a jack that size to it), as it would have allowed me to rotate the driveshaft behind the clutch to get the bolts off. to do this I ended up having to remove the front driveshaft so I could get it to free wheel.


But its awesome, works great, thanks for the help!




Haymaker

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Re: Diff lock, axle lock 4wd issues
« Reply #10 on: August 03, 2016, 07:53:19 PM »
Thanks, I feel stupid quoting from the manual! I know when torquing some nuts at 160ftlbs its hard work, dont know what I was thinking!-I will edit if I can


How would they ever have expected people to measure that torque reading for the clutch?


Again, thanks for your help

On my old square balers they had a spec the slip clutch should slip at.  You were to fabricate and attach something  like a 8ft pipe hooked to the pto drive line then hang weights or measure the force you place at the end of it.  So its length x force and one could get the 1000ft lbs or what ever spec the clutch had to slip at.  Same could be done on the  Belarus MFD sip clutch  if a person wanted to. 

But for yours torque it up to the 57 ft/lb spec and give it a try.  Was the nut very tight when you tightened it up? IF it was really loose those clutch discs maybe worn.   
  • Tractors- '93 Belarus 825 with loader and others...

Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #9 on: August 03, 2016, 07:19:31 AM »
Thanks, I feel stupid quoting from the manual! I know when torquing some nuts at 160ftlbs its hard work, dont know what I was thinking!-I will edit if I can


How would they ever have expected people to measure that torque reading for the clutch?


Again, thanks for your help

Haymaker

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Re: Diff lock, axle lock 4wd issues
« Reply #8 on: August 02, 2016, 09:58:53 PM »
Just to be clear 290 to 580ft/bs is what the clutch should slip at not the actual adjustment  nut torque spec.   My manual lists 57 ft/lbs for that nut. Over time as maintainance that nut is to be retorqued as the mfd slip clutch discs wear.
« Last Edit: August 02, 2016, 10:48:47 PM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...

Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #7 on: August 02, 2016, 05:56:43 PM »
Okay just adding to this. To help others searching when there Belarus tractor 4x4 4wd, front diff, is slipping or appears not working or not engaging, it could be the slip clutch!


As per the very helpful pic supplied by haymaker, the slip clutch may be under some guards linking the 2 drive shafts that go from the rear starboard side to the front diff. Getting the rear guard off the rear shaft off May be tricky as mine had very accessible nuts on the outside but the heads were flat head screw driver cap screws with no excess for a screwdriver (not sure if that was standard) ended up cutting them off eventually.



According to the manual (arir515, you rock!) for a similar machine (manual calls the slip clutch an intermediate bearing), the drive shaft is removed from the rear end of the slip clutch unit (I found the 14mm 1/2 drive sockets I brought to do the job were to big so maybe 3/8 would be better!)


Once drive shaft is removed from the rear of the slip clutch, there should be a large nut retained by a cotter pin. The Pin is removed and nut tightened. The manual says to tighten to between 290 and 580ft lbs or 41.2 to 82.2 kgf/meter, But this does not refer to that nut, the nut should be torqued to 57ft lbs!


Put cotter pin back, reassemble everything and see how it goes!!
« Last Edit: August 03, 2016, 07:21:59 AM by Timber »

Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #6 on: July 20, 2016, 08:18:25 AM »
WOW, very cool stuff, I think mine has a big cover over the slip clutch in the photo, was trying to imagine where it would have been otherwise.


Arie, thank you very much for that info, massive help!


Im a little overwhelmed, gone from so little info to a tide of it








Haymaker

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Re: Diff lock, axle lock 4wd issues
« Reply #5 on: July 19, 2016, 09:22:45 AM »
Here's what it looks like on mine.  Check out the link for the manuals also it will have pics and the specs on how to adjust/check the clutch.
« Last Edit: July 19, 2016, 09:31:38 AM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...

Timber

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Re: Diff lock, axle lock 4wd issues
« Reply #4 on: July 19, 2016, 07:05:56 AM »
 Thanks guys, thats awesome. So hard to find info at times, and yet I find myself full of questions!


Where is the slip clutch positioned,  Its not under the cover between the two sections of drive shaft is it? What does it look like? I assume it can be adjusted or at least examined to determine if its worn out etc. Its it like a PTO slip clutch?

Haymaker

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Re: Diff lock, axle lock 4wd issues
« Reply #3 on: July 17, 2016, 05:50:01 PM »
The front and rear have differentials and only the back is locking. There is a slip clutch in the driveline to the front wheels It could be slipping on you.  Often in typical operation you'll have one wheel in the front and back spinning when you "spin out" unless your in even traction conditions. As for the back wheels it does have a diff. Lock
 
  • Tractors- '93 Belarus 825 with loader and others...

arie515

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Re: Diff lock, axle lock 4wd issues
« Reply #2 on: July 17, 2016, 11:00:36 AM »
email me for additional manuals, maybe that could help.
aprilik[at]mtzequipment[dot]com

Timber

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Diff lock, axle lock 4wd issues
« Reply #1 on: July 17, 2016, 12:21:21 AM »
 I have a square cab Belarus 952 with 600 hours on it, recently brought it to conquer a ridgeline I have been trying to build road up.


The issue is that the 4wd system seems faulty. It has 3 settings of course, 2 wd, 4wd and locked 4wd.   In both 2wd and 4wd it seems to only drive off one rear wheel. if its in full locked 4wd, is drives more with both back wheels but not fully, and it seems the front wheels are only slightly engaging. There is a noise occationally that could be described as a clutch slipping and it shudders- hard to discribe.
 It does this when backing uphill with a full load in its bucket but I assume it would do it forwards to.


The diff lock lever seems inoperative.


Any ideas? is the front diff controlled through the diff lock somehow? I do have a users manual but its pretty light on info


Thanks