PT Rises from the Ashes

Sedgewood · Sep 12, 2003

Edward_DiMaria: Hey Sedgewood - is Columbia traqctor the guys I see at the Dutchess County Fairn every year? - I assume you go to it - Most of those folks who present there are really good folks


I'm not a fairgoer but I would think they would be there. Good people. I've been dealing with them at least since 1967 and maybe even before that.

Sedgewood

Sedgewood · Sep 12, 2003

Marrt: I think most folks who buy PT's like to “improve/modify” their equipment. I know I do. Trying to determine the optimal filtration for the PT, even though it may not make sense financially given the actual risk/design life of the tractor, is just part of the fun. 

Now THAT'S spot on! /forums/images/graemlins/laugh.gif

And the idea of a severe duty option seems like a good profit center too. Charlie, Hans, and I tried on our visit last fall (without much success I fear) to convince them of the potential profits in after sale accessories and upgrades. These are enthusiasts / tinkerers machines and we like to add stuff. Think of the money to be made in gimballed cupholders and rear view mirrors.

Oh yeah, gotta get back to my mirror project now that I have a tractor again,
Sedgewood

Sedgewood · Sep 12, 2003

duane: John, after you have worked your 1845 machine hard, could you post some hydraulic reservoir temperatures along with the ambient temperatures. Curious to see where the bulk temperature settles out at. 

I haven't gotten in enough seat time yet for anything definitive. At the moment I'm running the hydraulic cooler fan backwards (cause I accidentally hooked it up backwards and this gives me a chance to test whether the concept will help reduce chaff getting into the engine compartment) which kind of skews things toward the high side. I think the highest I've seen was 140 degrees at about 70 degrees ambient.

Sedgewood

Bob999 · Sep 12, 2003

What caused you to use a vacuum gage rather than a pressure guage?

Uh... the filter is on the suction side and there's a vacuum there?


Sorry for the dumb question. There was another thread that pointed to the Graninger catalog for RETURN LINE FILTERS AND ACCESSORIES. Apparently the same filter mount (and filter??) is used for both suction lines and return lines.

 I seem to recall seeing somewhere (on Gesen web site perhaps) that the relief valve is set at 3-5 psi 

At the risk of asking another less than brilliant question--how does a relief valve set for pressure work in a vacuum situation? I purchased the NAPA 1759 filter as a replacement and according to the WIX site this filter does not have a relief valve. And this filter is listed as a cross for the Parker filter carried by Grainger for return line applications.

MossRoad · Sep 12, 2003

At the risk of asking another less than brilliant question 

Boy, don't start worring about that!!! You're in good company with me hanging around here /forums/images/graemlins/tongue.gif

Sedgewood · Sep 12, 2003

Bob999: Apparently the same filter mount (and filter??) is used for both suction lines and return lines. 

Yes, except, and this is important I would think, when you use it as a suction side filter you have to change the relief valve spring (it's in the housing, not the filter element - I think the Sauer Danfoss article on cleanliness talks about it and has a cross sectional drawing of a housing) to a much lighter spring, in the range of 3-5psi instead of 15psi as I recall.

At the risk of asking another less than brilliant question--how does a relief valve set for pressure work in a vacuum situation? 

The relief valve is sensing the differential pressure across the housing - the pressure difference (caused by the restriction to flow of the filter element and its collection of dirt) between the inlet side and the outlet side. It don't care if you're suckin' or blowin' your oil through it. /forums/images/graemlins/tongue.gif

Sedgewood

bmac · Sep 13, 2003

Just a guess, but I'll bet this is it. 

Yep, betcha there's no show girls there. Sorry Terry /forums/images/graemlins/frown.gif

pajoube · Sep 13, 2003

This is the annual mining show which PT said they display the mining equipment as primary product but this year will also bring a few tractors to show the above ground product.
PJ

Schultz · Sep 15, 2003

I think the return line filtration is quite adequate. However it won't protect from slag in the tank, only a suction strainer would help there. If you want additional piece of mind then parker and many others have several filters to choose from down to 3µm, rated at or above 25gpm. If you add the 3µm filter then I think the pressure guage would also be a good addition.

Bob999 · Sep 15, 2003

I think the return line filtration is quite adequate. /forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif 

My understanding is that PT units have a SUCTION line filter for the variable displacement pump.

My further understanding is that PT units have no filtering on the PTO and auxiary PTO circuits and that they have no suction line screens anywhere in the system.