MossRoad
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- Tractor
- Power Trac PT425 2001 Model Year
That's your wallet when you buy a new tractor.
MossRoad
Super Moderator
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- 57,701
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- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
Hmmm. I get that noise if I don't have the engine at high enough RPM going forward OR backward.
You only get it going in reverse?
MossRoad
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So, to be clear, I get that noise when the load starts to exceed machine's capability to move in the direction I want to go. So, either engine RPM is too low, grade is too steep, pushing against an immovable object, etc... it's a strain noise.
If you don't get the noise going forward, but you get it in reverse and the engine stalls, it would seem to me that something is blocking or loading down the reverse circuit.
If you don't get the noise going forward, but you get it in reverse and the engine stalls, it would seem to me that something is blocking or loading down the reverse circuit.
MossRoad
Super Moderator
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- Power Trac PT425 2001 Model Year
To which you may reply... thanks Captain Obvious.
I have no idea what would be causing it.
I don't know how feasible it is, but if you could swap the forward and reverse circuit hoses at the variable volume pump, and try it again, and the problems shifts from reverse to forward, it would probably indicate the pump. May need extension hoses, etc... I can't recall how tight it is in there, but there isn't much play in mine.
You could also pull the two hoses off of one wheel motor and hook them together, then test. Do it for all four wheel motors, one at a time. Maybe one of them is having problems reversing.
Or, just call Terry at PT and tell him you get the whine in reverse and it stalls and see what he suggests.
I have no idea what would be causing it.
I don't know how feasible it is, but if you could swap the forward and reverse circuit hoses at the variable volume pump, and try it again, and the problems shifts from reverse to forward, it would probably indicate the pump. May need extension hoses, etc... I can't recall how tight it is in there, but there isn't much play in mine.
You could also pull the two hoses off of one wheel motor and hook them together, then test. Do it for all four wheel motors, one at a time. Maybe one of them is having problems reversing.
Or, just call Terry at PT and tell him you get the whine in reverse and it stalls and see what he suggests.
ponytug
Super Member
That fluid looks very green. Is that really green?
As for the other noise, I agree with @MossRoad's diagnosis. Personally, I would call Terry before opening hoses in the motor circuit because that oil is predominantly recirculating, and needs to be super clean.
All the best,
Peter
Yes it does look green…but when I drained some out into a pan, it looked like new, clean oil.
Earlier today I did email Terry with those videos.
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Yea, I think you’re onto it. Except, no load and it happens. Even on flat ground. And again, backing up a slight incline and I did run into a little bit of packed snow, and it stalled. I was in a bind here—going forward and I’d be over into the ravine. I had to keep punching at it and finally got it to move far enough to maneuver again. RPMS usually high and no difference. It would stall (movement) but motor still high rpms and no wheels trying to turn…
I wonder…I don’t know how the treadle pedals are supposed to feel, but it seems to me the left (reverse) one takes a lot of effort to push on, and I’m not really sure it’s moving very much. Just today I thought about that, and will check into it soon. But…if that pedal wasn’t moving as it should, would it play a part in creating that noise?
MossRoad
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- Power Trac PT425 2001 Model Year
I forgot or maybe it was never mentioned, several questions, so please forgive me if these are repeats...,
First, these machines are capable and designed to go full speed going forward AND reverse. So the treadle pedals need to be able to move the directional control on the variable volume pump an equal distance in both directions, wether that be cable operated or hydraulically operated.
Second, I have NO hands-on experience with hydraulic treadles, only the hydroback cable on my machine. I'm pretty familiar with it.
With that said...
- does your machine use a hydroback cable from the treadle to the variable volume pump, or is it hydraulically controlled?
- did you block it up off of the ground and try operating the treadle to see if the whine happens with all 4 wheels off the ground?
- The reverse treadle pedal is shorter than the forward treadle pedal, and it should be easier pushing the forward pedal than the reverse pedal due to leverage. BUT... it shouldn't be that hard to push the reverse pedal. Something is amiss.
- If it's a cable operated treadle, try turning the machine off and observing the action of the direction lever on top of the variable volume pump and make sure it can go the same distance when the pedals are pushed full forward and full reverse as measured from the center neutral position. It should be easy in both directions and full travel. If not, there's a problem with the pump, or the cable, or the treadle.
- Also, there are three grease zerks on the cable operated treadle. If you have cable operated treadle, make sure they are all greased and free moving. You could disconnect the cable at the variable volume pump direction lever and see if the treadle pedals move freely by hand in both direction while the cable is disconnected. That would help eliminate the treadle and hydroback cable as problems.
- If it's a hydraulic treadle, I recall mention of the early models with hydraulic treadle being too sensitive to movement and PT added springs under the treadle pedals to put more resistance against your feet so it wasn't so sensitive. If so, see if there are springs under each pedal somewhere.
- Also again, check for any debris under and around the treadle area. Mine frequently gets small sticks and brush in there that can build up under a pedal, making it impossible to push to full travel. I have to remove them after heavy brush cutting.
Hope those suggestions help.
First, these machines are capable and designed to go full speed going forward AND reverse. So the treadle pedals need to be able to move the directional control on the variable volume pump an equal distance in both directions, wether that be cable operated or hydraulically operated.
Second, I have NO hands-on experience with hydraulic treadles, only the hydroback cable on my machine. I'm pretty familiar with it.
With that said...
- does your machine use a hydroback cable from the treadle to the variable volume pump, or is it hydraulically controlled?
- did you block it up off of the ground and try operating the treadle to see if the whine happens with all 4 wheels off the ground?
- The reverse treadle pedal is shorter than the forward treadle pedal, and it should be easier pushing the forward pedal than the reverse pedal due to leverage. BUT... it shouldn't be that hard to push the reverse pedal. Something is amiss.
- If it's a cable operated treadle, try turning the machine off and observing the action of the direction lever on top of the variable volume pump and make sure it can go the same distance when the pedals are pushed full forward and full reverse as measured from the center neutral position. It should be easy in both directions and full travel. If not, there's a problem with the pump, or the cable, or the treadle.
- Also, there are three grease zerks on the cable operated treadle. If you have cable operated treadle, make sure they are all greased and free moving. You could disconnect the cable at the variable volume pump direction lever and see if the treadle pedals move freely by hand in both direction while the cable is disconnected. That would help eliminate the treadle and hydroback cable as problems.
- If it's a hydraulic treadle, I recall mention of the early models with hydraulic treadle being too sensitive to movement and PT added springs under the treadle pedals to put more resistance against your feet so it wasn't so sensitive. If so, see if there are springs under each pedal somewhere.
- Also again, check for any debris under and around the treadle area. Mine frequently gets small sticks and brush in there that can build up under a pedal, making it impossible to push to full travel. I have to remove them after heavy brush cutting.
Hope those suggestions help.
MossRoad said:
First, these machines are capable and designed to go full speed going forward AND reverse. So the treadle pedals need to be able to move the directional control on the variable volume pump an equal distance in both directions, whether that be cable operated or hydraulically operated.
Second, I have NO hands-on experience with hydraulic treadles, only the hydroback cable on my machine. I'm pretty familiar with it.
With that said...
- does your machine use a hydroback cable from the treadle to the variable volume pump, or is it hydraulically controlled?
Me: CABLE
- did you block it up off of the ground and try operating the treadle to see if the whine happens with all 4 wheels off the ground?
Me: I did, but I believe at the time my mission was to ensure all wheels turned smoothly and no noises from them. As well as see if pedals zeroed out correctly. I think the noise was still there, behind the seat…
- The reverse treadle pedal is shorter than the forward treadle pedal, and it should be easier pushing the forward pedal than the reverse pedal due to leverage. BUT... it shouldn't be that hard to push the reverse pedal. Something is amiss.
Me: I Need to look closer…
- If it's a cable operated treadle, try turning the machine off and observing the action of the direction lever on top of the variable volume pump and make sure it can go the same distance when the pedals are pushed full forward and full reverse as measured from the center neutral position. It should be easy in both directions and full travel. If not, there's a problem with the pump, or the cable, or the treadle.
Me: I will look into this further.
- Also, there are three grease zerks on the cable operated treadle. If you have cable operated treadle, make sure they are all greased and free moving. You could disconnect the cable at the variable volume pump direction lever and see if the treadle pedals move freely by hand in both direction while the cable is disconnected. That would help eliminate the treadle and hydroback cable as problems.
Me: Will check in this too
- Also again, check for any debris under and around the treadle area. Mine frequently gets small sticks and brush in there that can build up under a pedal, making it impossible to push to full travel. I have to remove them after heavy brush cutting.
Me: Will look closer.
Hope those suggestions help.
[/QUOTE]
Me: Many thanks again!
First, these machines are capable and designed to go full speed going forward AND reverse. So the treadle pedals need to be able to move the directional control on the variable volume pump an equal distance in both directions, whether that be cable operated or hydraulically operated.
Second, I have NO hands-on experience with hydraulic treadles, only the hydroback cable on my machine. I'm pretty familiar with it.
With that said...
- does your machine use a hydroback cable from the treadle to the variable volume pump, or is it hydraulically controlled?
Me: CABLE
- did you block it up off of the ground and try operating the treadle to see if the whine happens with all 4 wheels off the ground?
Me: I did, but I believe at the time my mission was to ensure all wheels turned smoothly and no noises from them. As well as see if pedals zeroed out correctly. I think the noise was still there, behind the seat…
- The reverse treadle pedal is shorter than the forward treadle pedal, and it should be easier pushing the forward pedal than the reverse pedal due to leverage. BUT... it shouldn't be that hard to push the reverse pedal. Something is amiss.
Me: I Need to look closer…
- If it's a cable operated treadle, try turning the machine off and observing the action of the direction lever on top of the variable volume pump and make sure it can go the same distance when the pedals are pushed full forward and full reverse as measured from the center neutral position. It should be easy in both directions and full travel. If not, there's a problem with the pump, or the cable, or the treadle.
Me: I will look into this further.
- Also, there are three grease zerks on the cable operated treadle. If you have cable operated treadle, make sure they are all greased and free moving. You could disconnect the cable at the variable volume pump direction lever and see if the treadle pedals move freely by hand in both direction while the cable is disconnected. That would help eliminate the treadle and hydroback cable as problems.
Me: Will check in this too
- Also again, check for any debris under and around the treadle area. Mine frequently gets small sticks and brush in there that can build up under a pedal, making it impossible to push to full travel. I have to remove them after heavy brush cutting.
Me: Will look closer.
Hope those suggestions help.
[/QUOTE]
Me: Many thanks again!
Update for Thurs Feb 20:
Spoke with Terry this morning. He heard the video and thinks it’s pump whine and pretty normal, but as far as the “stalling movement” he suggested checking the coupler from engine to pump. Sometimes they start stripping, and maybe if so, I can try tightening a set screw on it with a T-handle Hex. We also talked about the cable could be worn out as well as needing lubed. (I didn’t know it could be lubricated until Mossroad’s details above) He also is curious on why it’s happening just on reverse mode so I’ll dig a little deeper into the cable/pedals setup…
Whew! It’s too damned cold for all this LOL
Spoke with Terry this morning. He heard the video and thinks it’s pump whine and pretty normal, but as far as the “stalling movement” he suggested checking the coupler from engine to pump. Sometimes they start stripping, and maybe if so, I can try tightening a set screw on it with a T-handle Hex. We also talked about the cable could be worn out as well as needing lubed. (I didn’t know it could be lubricated until Mossroad’s details above) He also is curious on why it’s happening just on reverse mode so I’ll dig a little deeper into the cable/pedals setup…
Whew! It’s too damned cold for all this LOL