Two speed modification for PT 422/425

rox · Dec 2, 2005

Ducati,
I want to respect the forums, like this is the power trac forum, but I also think it is appropriate to mention in the forums other equipment that is similar to the equipment of the forum topic. This little Avant tractor/skid steer is really really similar to a Power Trac. Since I'm in France and the Avant is made in Finland I checked them out. I started a new thread in the other Brands - here

http://www.tractorbynet.com/forums/showflat.php/Cat/0/Board/other/Number/781411

I really thought hard about buying a Power Trac and shipping it by boat to France, but I think this Avant is a more practical solution. The Power Trac and the Avant are similar.

So Power Trac guys and gals I won't mess up your forum, back to 'yall

BobRip · Dec 2, 2005

( One thing I do swear buy is don't use Teflon tap on the fittings. The tape can shred off when screwing fittings in and leave small particles that can cause malfunctions. Using teflon tap on hydraulics, you might get by with it but your just asking for trouble. )

 That is the first I have heard that teflon tape is bad for hydraulics. I used it when I replaced the stump grinder motor. It's probably a little late to change now. What do you use instead?

Bob Rip

stray · Dec 3, 2005

Like I said you might get by with it. What can happen is the tape shreds off the ends it was wrapped on and gets caught in small hydraulic ports. If you do use Teflon tape use no more than 2 wraps and leave the last two threads unwrapped (the threads on the very end). I am as guilty as the next person of using Teflon tape and I have taken apart valves and found that small slivers of the tape were the culprit. Removed that and the valve would be ok.

BobRip · Dec 3, 2005

Is there another alternative? How about the teflon grease that plumbers use? Is nothing on the threads the best option?

Bob Rip

stray · Dec 4, 2005

( Is there another alternative? How about the teflon grease that plumbers use? Is nothing on the threads the best option?

Bob Rip )
Yes the Teflon grease would be better. Its not the Teflon that is such a risk but the fact that it slivers off and ends up in the system in a solid form. What ever you put on treads serves as much as a lubricant (so the treads can be tightened) as it does a sealer.

toolz_not_toyz · Dec 5, 2005

( Is there another alternative? How about the teflon grease that plumbers use? Is nothing on the threads the best option?
)

Good luck getting a tight seal by using nothing on the threads, especially for any fitting that is under pressure. The answer would be no.

I have used teflon tape on water pipes for about twenty years and have seen evidence of shredded bits of teflon when clearing a new line. I think the problem is caused when you overlap the tape across the opening of a fitting. I can't see how the tape would cause problem if you don't do that. Obviously, clean off the fitting immediately after disassembly. In recent years I have started to use paste instead in some cases.

The local propane guys around here have advised me to start using BOTH tape and paste on propane fittings (I think that's weird, but whatever).

I think if there's a possibility to get teflon tape in your circuit then it is also possible to get residue from the paste in there as well.

stray · Dec 6, 2005

Guys I don’t know what else to tell you. Here is what I use professionally on Hydraulics at work as well as at home. That said, in a pinch I have used Teflon tape but I was asking for trouble, it tends to squirt out the end of the treads when tightened. I definitely agree, you do need to use some kind of sealant.
Loctite 567 item no. 56747
PST PIPE SEALANT WITH PTFE
High temperature For Stainless Steel and Other Metal Fittings
The two tubes pictured are the same thing.

toolz_not_toyz · Dec 6, 2005

I didn't know you could use Loctite for this application.

Phils · Dec 6, 2005

Just to affirm a point: my propane people use (and recommend) BOTH teflon tape and teflon paste for propane pipe connections. I first learned this maybe 20 years ago when we were installing all the underground piping to the house and outbuildings. I've followed this rule ever since even for water piping. But not for hydraulics, where I use paste only and try to be VERY careful, leaving at least 2 threads bare at the end. No problems so far with any connections.

Phil

stray · Dec 6, 2005

( I didn't know you could use Loctite for this application.

)

Just so there is no misunderstanding this is a Loctite BRAND tread sealant. Not the Loctite brand loctite that locks threads in place. At one time this confused me too. /forums/images/graemlins/confused.gif