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flushing out transmission/Hydraulics

Posted: Mon Jan 06, 2020 5:36 pm
by goDB1212
Any tips on how to flush out transmission of a 1212. I drained the oil and what came out was gunk. If I refilled with new oil i'd have to drain it again after a few hours running which is expensive. Is there a cheaper option?.

Re: flushing out transmission/Hydraulics

Posted: Mon Jan 06, 2020 7:36 pm
by philedge
If you search the forum for "gearbox flush" you'll find all the tips you need:) Post back if you cant make sense of the process

Re: flushing out transmission/Hydraulics

Posted: Tue Jan 07, 2020 11:16 am
by cobbadog
One of the tips for my tractor was to use diesel in the box and drive slowly around hitting the brakes and accelerating for a short time. Drain completely, maybe even doing it twice then if happy refill with new oil.

Re: flushing out transmission/Hydraulics

Posted: Tue Jan 07, 2020 2:00 pm
by Gard
I also had good luck with the diesel flush. The other thing my owners manual suggests is drain oil when hot, and let it set in a large container. Allow time for the crap to settle to the bottom, the clean oil on top can be carefully decanted and put back in tractor and discard the bottom gallon or so. A clear container helps a lot. A good job for the hottest day of the summer.

Re: flushing out transmission/Hydraulics

Posted: Tue Jan 07, 2020 2:12 pm
by ollek
I would not recommend using any of the old oil. This recommendation is from the time the oil price was very high and oil supply was difficult. Letting the oil set in order to separate dirt is OK, but the problem with the water remains. Water in the oil will spoil the oil and separation will not make the oil any better.

Re: flushing out transmission/Hydraulics

Posted: Tue Jan 07, 2020 6:35 pm
by bedwards1966
Use the diesel flush. It's a pretty cheap method and is very effective, far better at removing filth than oil. You could do it twice if you wanted, but it would have to be very, very bad to need that.

I've seen where clean oil gets instantly contaminated and looked like used engine oil, one diesel flush and it's back to how it should be.
Don't use the hydraulics while there's diesel in the system.

Re: flushing out transmission/Hydraulics

Posted: Wed Jan 08, 2020 5:45 pm
by goDB1212
Thanks all.
There's a loader on the tractor also. So i'll have to drain the rams. Looking through some of the forum for "flushing" it is best to disconnect the return hose from the loader and operate it up/down to flush out also hence using hydraulics but the advice is to operate it just enough to clear out the rams.. I'll assume the hydra pump will be ok with diesel running through it!! It's going to run through it anyway as soon as the tractor starts, isn't it?

Re: flushing out transmission/Hydraulics

Posted: Wed Jan 08, 2020 8:00 pm
by philedge
goDB1212 wrote:
Wed Jan 08, 2020 5:45 pm
Thanks all.
There's a loader on the tractor also. So i'll have to drain the rams. Looking through some of the forum for "flushing" it is best to disconnect the return hose from the loader and operate it up/down to flush out also hence using hydraulics but the advice is to operate it just enough to clear out the rams.. I'll assume the hydra pump will be ok with diesel running through it!! It's going to run through it anyway as soon as the tractor starts, isn't it?
Youre quite correct in that diesel will run through the pump and selectamatic valve. Personally Id be happy to run diesel through the loader valve and rams but if youve got concerns then just make sure that when youve got fresh oil in the gearbox you put the loader return line in a bucket before you start the tractor. Operate the loader as soon as oil is routed to the loader valve so you get the milky oil out a quickly as possible to minimise new oil wastage. If youve got single acting lift rams you dont need to fully extend the rams as your only clearing the pipes and abit of residue in the rams. Double acting rams need to go through their full travel. I think mine took half a gallon(ish) to get the return oil running clear.

Re: flushing out transmission/Hydraulics

Posted: Sat Jan 11, 2020 7:32 am
by bedwards1966
Cleaning out loader rams.

If they're single acting just have them all the way in - loader sat on the ground.

For double acting you want to work it through the full stroke to get both sides empty.
I usually lift the loader all the way up, drain the oil and use gravity to lower the loader. You suck air into the ram which is fine by me as it's not dirty oil and it's soon eliminated afterwards. For the crowd ram sometimes it's possible to manually tilt this (especially if there's something like a bale spike attached for some leverage), do this before dropping the loader all the way to the ground.

It is possible to flush it out with new oil in the tractor and the return line from the loader block into a bucket, start the engine while holding the loader control in the position you want it to move, then shut the engine off as it gets to full stroke. If you don't let go of the lever you don't pump any good oil out as it's directed to the ram, but do be ready to stop the engine quickly then release the lever.