Hydroback Cable

[J_J]

Would you tell us how the valve works. and some pictures.

 

[J_J]

Thanks JJ, do we know which we use the 10 or 20 pound?

Also anyone able to post pictures of the hydraulic replacement for the Hydroback cable--as used on the new machines?
Thanks
Bill

No, I really don't know which one PT uses. There have light duty Hydrobacks, and Medium duty Hydrobacks, with cable movement of 2 in, and 3 in. You might be able to cheat and add spacers in the unit, which would compress the springs .

 

[SpringHollow]

These are the best that i have.

Ken

 

[MossRoad]

On the 400 series PTs with hydroback cables, there are three grease zerks on the treadle linkage and a couple heim joints. They are supposed to be greased regularly. Is everyone doing that? I do it. One of the advantages of doing that is that it forces you to remove the side of the tunnel covers and clean out all the sticks and clippings. It is also a good time to inspect the hoses that are in there.

 

[MossRoad]

I did some searching and had to go back to some posts back in 2003.

Here is our PT425 treadle with hydroback cable. Note the grease zerks and heim joint.

Here is the other side.

There is a total of three zerks and three joints that should be lubed every 8 hours.

Now here is a picture of PJ's valve that replaced the hydroback.

 

[J_J]

Thanks. That is the first time I have seen that valve. Logic tells me that the pedal is operating a lever that sends fluid to the transmission to shift the pump swash plate, which will vary the speed of the wheel motors.

 

[MossRoad]

Thanks. That is the first time I have seen that valve. Logic tells me that the pedal is operating a lever that sends fluid to the transmission to shift the pump swash plate, which will vary the speed of the wheel motors.

Iinstead of having an external arm on the variable volume pump that is moved by the hydroback cable, the hydraulic fluid from the treadle valve moves some internal mechanism inside the pump.
Here's is a picture of PJ's. The top hose going into the variable volume pump is from the treadle valve.

Here's a pciture from the other side. You can see it in the shadows.

 

[woodlandfarms]

How come everyones tractor is so clean in the engine compartment? No matter what I do it is full of oil and debris. I think I pull and wash the junk out and it just crawls back in to tick me off...

 

[J_J]

David,

Do you know the manufacturer of that pump? I see what looks like the letter P, and I can't see the letter beside the P?

It looks so clean because it probably was pressure washed.

 

[MossRoad]

How come everyones tractor is so clean in the engine compartment? No matter what I do it is full of oil and debris. I think I pull and wash the junk out and it just crawls back in to tick me off...

Hee hee!!! Because we all took pictures of them when they were new because we know what they'd look like in a few weeks of use! Those pictures are from 2001 and 2003.