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Lesser Known Classics Discussion Forum

Re: 530 belarus

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J. Bruns

10-31-2013 18:34:29

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Thanks for the response I haven't had any experience with these tractors either but I know what valve you are talking about it seems no matter which way you move it nothing changes like the pump is out. I also don't know what all the levers do on the dash, there are a couple that are plumbed for aux hyd but there's one that I can't tell what it does by just glancing at it. any input is a big help this is a friends tractor I'm trying to fix and it's about a hour from me so when I finally get to work on it it will be nice to have as much info as possible. I also took relief valve out and cleaned it and nothing changed. Thanks again

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Robert Major

10-31-2013 23:11:14

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 Re: 530 belarus in reply to J. Bruns, 10-31-2013 18:34:29  
Hi Ok so what you are saying is there is no hydraulic function at all, the whole thing seems dead apart from they got power steering, that should be a separate engine mounted pump.
It could be the flow control is stuck also.
as you sit on the tractor looking forward. under the dash there is the main control spools. The PRV sits on the top of the ledge at the left side, the one you cleaned?
Go down the side of the block and straight under neath the prv. there is a small oblong plate, held with 2 bolts( 14mm heads) undo that, oil will start coming out. up in there is the flow valve.

To get that out there is a threaded hole at an angle in the end, thread one of the plate bolts in there. gently lever out that part, it has an O ring on to seal the bottom. then there should be a spring and another mushroom valve comes out. in the top of the mushroom there will either be a hole to one side or another little valve, or parts of the little one will fall out when removing the rest. That will be a little spring a pin and probably not the tiny snap ring if it's in pieces. it could be that small valve fallen apart and jammed it. or crap in the big valve not letting the 2 parts slide or seat. I usually take 1200 wet and dry sand paper (VERY FINE STUFF) you don't want to score this valve up! spray WD 40 on the paper and wrap the valve and polish it buy turning it once or twice on the male parts, but not on the seat at the top of the mushroom, and then clean it real good after. A small paint flake can jam it to!.
If you get the parts from the small valve throw them away and don't worry, usually i remove them, if they are still in there to save them falling apart and jamming the system later. Our factory service manager used to recommend this.

Put the valve back in and try it. It's a messy dirty job so i hope you don't mind oil up your arm!

You got 4 levers inside 2 are external spools. next 2 are rear 3 point to give arm raise lower with power down and right forward should be float on the arms. The other one should be something to do with setting the system up for pressure control. I think you push it right forward and pull back 2 notches for regular 3 point use. those are levers 3 &4 from left to right. something tells me 3 is lift lower and 4 is that pressure control one.
my books not around right now. so might be other way round for the positions in the line of levers for the last 2. I had another post back a few months or so ago here with that in.
later tractors did't have 4 levers and that system of pressure control.
The other thing is on the right side from seat on the hyd tank under the hood, is a disengage lever for the hyd pump drive. make sure that is in gear and driving the pump, the lever points up and locks in a notch its got a pull knob to lock it in position.
I have seen them take a tooth of the internal gear and loose drive to the pump. or somebody goofed with it, and the lever jumped out of gear. If you find rubbish in the valve you need to clean or replace the hyd filter. opposite side of hyd tank at top under plate on raised casting. early is washable metal screens, later replacement paper element, and change oil also if it's dirty oil/ filter it will probably do it again.

Also check on the rear ram some tractors had height control this was an adjustable collar on the ram rod. and it pushed a little pin in, on the top end of the cylinder as you look from rear. make sure that pins free and moves in and out, if you find you have spool/ services working and just no 3 point. If that pin sticks arms drop but won't come up, it shuts the raise flow off if it's fitted on this tractor.
The odd tractors slacked the nut in the piston and dumps oil through between the rod and piston causing flow through the cylinder, and no lift if you find external flow still works also. try lifting the arms by hand and see if you have say a few inches or more allowing for slop in the hitch and pins, of free play before you feel resistance from the rod moving up against the piston. sorry this is long and not realy in a logical test order, I was writeing this as all the years of problems came back to me. I figured being that far away, I'd give you more info, so you got a lot of things to look at if it's not that linkage to the draft unit.
your later description kinda tells me that draft position control might not be the whole problem with this tractor. If I was there I'd probably be able tell ya right away what's up.

That system can be a pain if anything is wrong in that draft unit under the seat, or in the spool other than the p.r.v or flow valve.

Regards Robert
This post was edited by Robert Major at 23:43:29 10/31/13.

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J. Bruns

11-05-2013 08:40:22

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 Re: 530 belarus in reply to Robert Major, 10-31-2013 23:11:14  
Thanks I will be there this weekend and take a look it doesn't have any other functions working. I'm thinking one of the relief or flow controls is the problem, even if that draft valve for the three point is bypassing when trying to use it neither one of the aux valves are working either like the pump isn't working. But I looked at it a while back and I seem to remember that valve under the seat was plumbed in series to those other valves and it was a banjo style fitting so I wasn't able to block it off to eliminate that. Thanks Jon

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Robert Major

11-05-2013 10:51:51

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 Re: 530 belarus in reply to J. Bruns, 11-05-2013 08:40:22  
Hi Jon If every things dead make sure you got pump drive then go to that flow valve. The owner of the dealership in town runs Belarus. he has no mechanic for them any more. He asked me one day about changing a pump. I asked why he told me system went dead suddenly so needed pump. I asked about the flow valve and he looked blank. well I went cleaned that valve and away the system went. it"s not very often I change pumps. I bet i"ve only done 4 or 5 in 23 years. but cleaned 50 or more flow valves, and probably 3 got replaced as they where damaged. By the way all those hyd fittings are metric thread in the system! Good luck and let me know what happens
Regards Robert

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J. Bruns

11-05-2013 17:20:20

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 Re: 530 belarus in reply to Robert Major, 11-05-2013 10:51:51  
I will be out there tomorrow to take a look, that valve you are talking about I have had out and it seemed clean and it was polished up and I put it back together but still nothing. So there is another pressure relief somewhere else or is there only one. I remember taking it out when you said clutch side and there was a threaded hole offset to pull it out so hopefully there's another one I'm missing. Also the levers do one of them have to be forward or back then you move another for this to work that may be a issue also but I still have no aux functions. Thanks Jon

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Robert Major

11-05-2013 20:26:30

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 Re: 530 belarus in reply to J. Bruns, 11-05-2013 17:20:20  
Hi The valve under neath is flow the one on top is the relief, it should be held with lock wire, what have you done with that one because if that's not right it won't build pressure either. I have seen a few of those flow valves come out twice before they worked.It could be the flow valv seat is damaged in the block to, Thing is i'm guessing a lot of this, seeing it all is something i'm dissadvantaged heavily with here.

The Front levers will have neutral in the middle on 1,2and 4. meaning right forward is float next back would be external power one way then neutral, right back would be power other way Make sure those are all in neutral, I think that might affect flow in the block, as you can't use 2 functions together on older tractors. 3 is the one that should go right forward and then back 2 clicks if my books right. You should then be able to raise lower the 3 point, with the position lever by the seat or under the steering wheel depending where it's located on a 530. Just out of interest does the pto work to power an implement?. The hyd pump drive comes off the back of the clutch cover. I have seen a few where the splines wear, but not right off normally to loose drive, the 66 series internationals do this. Then they loose pump drive and pto. I wonder if that could be your problem here also as you say seems like no pump drive. if it is that it's a pretty big job as the front of the trans has to come apart to do it. all my customers so far have said just change the clutch cover and hope it lasts a few more years , before it strips, had one go home like that last week!. Regards Robert

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11-04-2013 05:49:43

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 Re: 530 belarus in reply to Robert Major, 10-31-2013 23:11:14  
The 530 is a 2wd utility type version of the Minsk water cooled 4 cylinder tractors.

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