Posted by Robert Major on October 31, 2013 at 23:11:14 from (216.130.91.167):
In Reply to: Re: 530 belarus posted by J. Bruns on October 31, 2013 at 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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