Foot Treadle

[coolconnection]

Well, I should find out the damage early next week. They felt confident about repairing it so lets hope that is all it is. I thought about debris in the system but nothing came out in the hoses upon disconnecting them. It all happened pretty fast but I will talk to Terry about crap in the lines. I feel better about it all now but I hope I don't have to replace the pump. It is just over two months out of warranty, just my luck. That tractor is a snow pusher. I have piles of snow over 6 feet high around here. I just hope I don't get to much snow before I get it all put back together. You know after tearing the thing apart, it really wasn't as hard as I thought it would be. I think I only took out 9 bolts total and I was right down to the main pump.

 

[toy]

jj is right on about checking with pt in Tazewell to see how would be best to make sure there isn't anything else in the oil system and the best way to clean it up. hopefully you don't have another problem in that system that might have had a piece break lose and go through the pump that caused the problem. Hope the best for you at the lowest cost possible.

 

[coolconnection]

jj is right on about checking with pt in Tazewell to see how would be best to make sure there isn't anything else in the oil system and the best way to clean it up. hopefully you don't have another problem in that system that might have had a piece break lose and go through the pump that caused the problem. Hope the best for you at the lowest cost possible.

Thanks, I hope this doesn't turn into a nightmare. I will be so ticked off if it does.

 

[BobRip]

When I first bought my PT422, I was told that if I ever go into the wheel motor circuit, I should flush and filter the hydraulics with a 3 micron filter.

 

[toy]

Bob Rip since you mentioned it, I seem to remember being told that to or read it one. I think I would change the filter when I got it back together and then change it again after I had run it for a while, I wouldn't wait on the 50 hour schedule on that change and I am kind of a curious guy, I would cut the filter open and check what was or is in it.

 

[BobRip]

Bob Rip since you mentioned it, I seem to remember being told that to or read it one. I think I would change the filter when I got it back together and then change it again after I had run it for a while, I wouldn't wait on the 50 hour schedule on that change and I am kind of a curious guy, I would cut the filter open and check what was or is in it.

The built in filter is only 10 microns. They want a much finer filter after this or similar incident.

 

[toy]

Bob Rip did you understand them to mean to run a 3 micron all the time from then on or just to run it for a short period of time to recirculate the oil and fine filter out the contaminants and then go back to the 10 micron? I thought it was just for a short period of time, and I have talked with others that have varying opinions on that. When I lost my wheel unit I just changed the filter and worked it for a few hours and then changed the filter again and then went back to the scheduled maintenance program. I didn't use a 3 micron filter I just used the regular filter, I wouldn't advise anyone else to do that, that is just what I did.

 

[SpringHollow]

Would running it at idle for a few hours without driving the tractor, possibly working the PTO and loader be a god idea?

Ken

 

[ponytug]

Ideally, you'd flush the lines first, and then block up the tractor and and slowly flush the lines. I would put a really strong magnet on the filter. You want to get anything that you can possibly suck out of the oil.

I'm wondering if PT has in mind replacing the 10 micron with a 3 micron, or whether they envision a 3 micron in the pressurized wheel motor circuit. (which is where I would put it, but remember to only go one direction!) IF you replace the main filter, go easy on the PT when it is cold. You will be pulling a heck of a pressure drop across the filter, and it will be prone to degassing and cavitation. So, low engine speeds until the oil is warm/hot. Preheat the oil, if you can.

I don't think that running it at idle isn't going to sweep the debris, if there is any, out of the lines. Even if it sweeps some out, when you crank up the speed, more will get flushed out.

I am curious what the opinions are of people who deal with this regularly; does one strip the motors? does one flush the motors with clean oil?

All the best,

Peter

Would running it at idle for a few hours without driving the tractor, possibly working the PTO and loader be a god idea?

Ken

 

[Bob999]

The filter installation used by PT is a compromise--it is generally undesirable to have a filter on the supply line because as the filter loads it increases the potential for cavitation but cleanliness of supplied oil is essential with positive displacement pumps such as the variable displacement pump used by PT. So the PT compromise is to install a 10 micron filter on the supply line for the variable displacement pump (which includes the charge pump) and to recommend very frequent filter changes to minimize to possibility that the filter loads up and causes cavitation.

I would NOT install a 3 micron filter in place of the 10 micron filter because of the likelihood that cavitation would result and damage the pump. If a clean up is necessary I think a filter cart or other filter arrangement should be used.