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MTZ Tractors - Old Models (Belarus) / Re: 822 electrical problems
« Last post by damengineer on March 24, 2020, 10:58:11 PM »
My 825 has a hood decal stating 822.  I replaced the ignition switch and the interlock relay.  The grounding switch was disconnected at the time.  I smelled something burning and the series/parallel switch was smoking...   I have'nt figured out what caused this.........  The wiring is really a pain.  The wires all look the same color.  I have not really found a wiring diagram that fits the tractor.  The one on page A5-9E appears to be the closest....   Has anyone had experience with the wiring on these??   I have a spare series/[arallel switch.  If this does not fix it then I am going to have to rewire it to 24V start with the gauges running on 12V.  I have a 24v self exciting alternator.  I really don't want to go to all that work right now as I will have to remove the loader to do all that work.  Hanging over the side of the loader is not fun..
MTZ Tractors - Old Models (Belarus) / Re: 822 electrical problems
« Last post by damengineer on March 19, 2020, 05:59:49 PM »
I have changed the keyed starter switch on the dash but the starer will not crank.  When started, the indicator light on the left of the dash goes out.  The s tarter does not engage after the tractor has run up to speed as it did before.  However, the ammeter is not indicating the alternator is  charging.  The schematic I have shows a 50amp fuse labeled PB50 or PV50 the location is stated as front dashboard, but I have not found one there yet.  Does anyone have any experience??
MTZ Tractors - Old Models (Belarus) / Re: 825 cold start - Flame Starter/Glow Plug
« Last post by sd825 on March 12, 2020, 04:04:59 PM »
This is great! Thanks for sharing. Where did you get the thermostart?
MTZ Tractors - Old Models (Belarus) / 822 electrical problems
« Last post by damengineer on March 09, 2020, 10:44:48 AM »
My 822 would not start, the starter would not engage.  24V switch would acturate but no starter.  One of hte screws that holds the solenoid onto the starter had vibrated out and the solenoid case was out of alignment.  However, after getting it all together I started up and drove about 300 ft and the starter engaged.  I staopped and restarted it and after it ran about 15 seconds the starter again engaged.  I finally had to quit.  It appears the interlock relay is bad.  I have ordered both relays in the circuit and another ignition switch as my switch is frozen and I had connected a switch to the 24v switch to actuate the starter.  Perhaps the ignition switch is stuck in start position and causing the problem.  If replacement does not work, then complete rewiring is in order... 
I have chained a post to the tracks of a dozer to get it unstuck.  When it got to the end of the tracks, it broke the chain, so use an old chain..    You can also chain a post to the outside of the tire so it will dig in the ground as it comes around.  works well if the tires are wider than the fenders.  Also can chain a short piece of log to the outside of the tire and stop just before it hits the fender...
MTZ Tractors - Old Models (Belarus) / Re: Belarus/MTZ hydraulic pump upgrade
« Last post by damengineer on March 09, 2020, 10:32:36 AM »
Talked to Ray and he also said the pump was a left hand rotation.  However I found this one on Ebay that is for the MTZ 80 & 82 which I believe is the same tractor as my 822 & 8345.  I believe this pump can be run either direction.   I am going to try it. 
here is the link...https://www.ebay.com/itm/NSH-50YZ-3L-NSH50U3-BELARUS-HYDRAULIC-PUMP/142606509566
MTZ Tractors - Old Models (Belarus) / Re: 822 ground switch upgrade
« Last post by arie515 on February 28, 2020, 03:09:49 PM »
I will email you a link to download 800 series manuals. Hope you will find there what you're looking for.
My old 822 starter worked one day the next it wouyld not do anything.  I could only hear the 12/24 switch engage.  I finally made a remote starter switch and connected it while holding a volt meter on the starter terminals.   I had 24v to the starter and then 214v to the solenoid but it was not working.  One of the 3 screws that hold the solenoid on to the starter had fallen out and the solenoid was slightly off center and binding the plunger inside.  I had checked this by crossing the big starter terminals while engaging the switch. 

Just  FYI
MTZ Tractors - Old Models (Belarus) / 822 ground switch upgrade
« Last post by damengineer on February 28, 2020, 12:00:48 PM »
My 822 ground switch is the old pushbutton stylle switch.  My arthritis has got bad enough that I can't push the button in.  My wife always had trouble with it.   I have lubricated the stem also and it still is just too hard to push.  I have a couple of the newer style ground switches, for my 8345, but the newer switch is not as deep as the old one and will not make connection to the grounding bracket at the bottom of the switch to the cab.  I cannot find a part number for the bracket for a 8345 as I don't have parts manuals for the 8000 & 9000 series.  The newer style switch will work, but there is a lot of modifications to the bracket needed to make it work.   a bracket from an 8345 would solve the problem...  Also I would like to have a sert of parts manuals for the 8345
Update on my OEM starter (bad ground) also I used a flexible 3/8 wobbly 12 point 17mm using a 24inch long extension easygoing.
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