I will give this a test this weekend before I tear it apart.
PT-180 Clicking or thunking from wheels under stress
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MossRoad
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The filter only feeds the charge pump in the tram pump. What they're alluding to is that if the filter is plugged/restricted, maybe the charge pump isn't making up the fluid for the tram pump, so when it attempts to build pressure as you push the tram pedal, it can't.
The other hydraulics aren't filtered, so wouldn't be affected.
MossRoad
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Good luck on your tear down.
Remember, with hydraulics, cleanliness is key. So if you're going to crack open fittings, be sure they are clean before you do it, and be sure you have a way to plug the open fittings with something clean, and that you don't drop a hose lower than the tank, as you don't want to siphon your oil tank overnight. Common sense, that's all.
Remember, with hydraulics, cleanliness is key. So if you're going to crack open fittings, be sure they are clean before you do it, and be sure you have a way to plug the open fittings with something clean, and that you don't drop a hose lower than the tank, as you don't want to siphon your oil tank overnight. Common sense, that's all.
ponytug
Super Member
Ooops. I see that @MossRoad beat me to it.
So the filtration on PTs is different than many other hydraulic systems.
First a little background. The main drive pump system for motion is a variable volume pump that can send, you guessed it, variable amounts of oil out to the wheel motors in forward flow or reverse flow. It is basically a closed loop system. Some the oil circulating in that circuit leaks out in the variable volume pump and is returned to the tank. That would leave a shortage, except that there is a small pump that pressurizes (charges) the variable volume pump with oil. It is called the charge pump. The oil suctioned from the oil tank is filtered before going into the charge pump, and thence into the variable volume pump, and the wheel motors.
So,...it is possible that the suction oil filter has a problem, causing problems in just the wheel drive circuit, and not affecting the other systems. Does that make sense?
Again, my bet is on Terry.
All the best,
Peter
m5040
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So is Terry telling you to remove the tram pump and ship it to Tazewell?
Yep. My current plan is to tear it down and if that lovejoy connector looks good, ship the pump off to him for a rebuild.
m5040
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For a 75 hour pump, I would lean to fix the problem. Everything else should be almost new unless foreign material ran through it.
cqaigy2
Super Member
When i bought my PT, i had it for something like 2 months and noticed a lot of oil leaking out of the tub, it was coming from one of the pumps. I think it was the variable volume pump. It was a nice stream coming out of the shaft area. Sent the pump back to Terry/PT and they shipped one probably the same day i had my pump out of the PT.
I'm probably one of the people that Moss alludes to, about draining oil out on the ground, as i'd not plugged one of the hoses, just put a plastic bag over the end with rubber band. It slipped off what i had it propped up on, and drained a few gallons of oil on to the floor of my shop. It was such fun to clean up.
I'm probably one of the people that Moss alludes to, about draining oil out on the ground, as i'd not plugged one of the hoses, just put a plastic bag over the end with rubber band. It slipped off what i had it propped up on, and drained a few gallons of oil on to the floor of my shop. It was such fun to clean up.
ponytug
Super Member
Power-Trac will know once they open the case whether it is worth servicing. As it is functioning and not making noise except under load, I think that the odds are favorable.
All the best,
Peter
Terry recommended I cap all the lines. I am hoping the local tractor supply store just has them in stock.