PT-422 Hydraulics not working

[Frank Sorbello]

I bought a used PT auger power unit with my PT 422, but couldn't test it at the time of the sale because the hoses were dry rotted and cracked.
I took the unit to a hydraulic shop. They put new hoses and fittings on the power unit. They also checked it on a bench and said it was working fine.
I took it home and hooked it up to my PT 422. Started the tractor and flipped the PTO. Nothing happened. Can you please help me trouble shoot the aux hydraulics?

Thanks
Frank

 

[BobRip]

I bought a used PT auger power unit with my PT 422, but couldn't test it at the time of the sale because the hoses were dry rotted and cracked.
I took the unit to a hydraulic shop. They put new hoses and fittings on the power unit. They also checked it on a bench and said it was working fine.
I took it home and hooked it up to my PT 422. Started the tractor and flipped the PTO. Nothing happened. Can you please help me trouble shoot the aux hydraulics?

Thanks
Frank

Is your PTO solenoid engaging? It is located in the engine compartment on the driver's left toward the front. Check and see if it has a nominal 12 volts with the switch on.

 

[Frank Sorbello]

Not exactly sure where the solenoid is located. Is it just behind the starter, under the muffler?

 

[Frank Sorbello]

<img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=319222"/>
Not exactly sure where the solenoid is located. Is it just behind the starter, under the muffler?

Is the solenoid sitting on top of the spool valve? In the picture it is a couple of inches from the red battery cable going to the starter.

 

[BobRip]

Is the solenoid sitting on top of the spool valve? In the picture it is a couple of inches from the red battery cable going to the starter.

Yes, I am pretty sure that is it. My layout is different.

 

[woodlandfarms]

reach down and grab that solenoid and twist it back and forth a few times (if it will move). Then turn your key on and flip your PTO switch. I don't know your system at all but unless there is a kill I don't know about you should feel the solenoid click. My feeling is that you are missing a wire on the solenoid (Solenoid is an electric valve that is electro magnetically operated). I am not sure, but it looks like you are missing a ground wire. Then again, maybe the chasis is ground.

Jeez am I stupid. Have you run your mower or the PTO with any other device? If you have and they work the issue is that you either did not get the hoses connected right or there is an issue with the auger.

 

[Frank Sorbello]

It appears there is a wire broken off the solenoid. The only attachment I have is the power auger and I recently had it tested. It is okay.

Do you know where I can find another solenoid? Can I pull the solenoid to find out the make and model number without shutting down or draining all the hydraulics?

 

[woodlandfarms]

Again, i don't know your system but you should be able to remove it. As for finding a replacement, JJ will have the answer.

Under the solenoid there is should be a standard nut holding the solenoid cartridge in the aluminum block. Just reef on it to open.

Is there enough of a stub of wire for you to solder another on. It is your ground wire that is missing (near as I can tell) so it wouldn't pose an electrical issue.

Oh, one other quick way to determine if your PTO is working is to start your engine and run at idle and turn the switch on, if the engine bogs down, your PTO is working.

 

[MossRoad]

If you pull the solenoid, be sure to make sure you can plug the hole because IF the hole is lower than the hydraulic oil level you can lose a lot of oil overnight. Just a precaution, but worth being concerned about.

 

[J_J]

I believe the black part is removable and the base part stays screws on

Call PT and order a new one.

You might be able to salvage the solenoid by digging around the wire and solder a new wire.

Apply 12v to it and see if it still works.

You might be able to replace the valve with one like this.

http://www.surpluscenter.com/item.asp?item=9-5112-NC&catname=hydraulic

 

[Frank Sorbello]

JJ, Is there a way to know if the one you found on Surplus Center will work. Looks like the right set up. I don't have too much information on the existing one other than it is made by Sterling Hydraulics.

 

[J_J]

JJ, Is there a way to know if the one you found on Surplus Center will work. Looks like the right set up. I don't have too much information on the existing one other than it is made by Sterling Hydraulics.

This valve is another option and will do the same job, maybe better. It is similar to the valve on my 1445 for the PTO circuit.

Surplus Center - 3/8 NPT HYD FLOW CONTROL VALVE W/RELIEF RDRS137-08

It will provide variable speed from 0 to max rpm, using the 8 GPM pump flow.

In the 0 rpm mode, all the pump flow goes to tank.

There is also a relief valve, that is set at 1500 psi, but is adjustable to about 3000 psi.

 

[Frank Sorbello]

JJ What would I need to modify to my existing set up so I could use that valve? and where does the solenoid go on that one?

 

[J_J]

The last valve I posted is not a solenoid valve, but does control the flow to the PTO.

It is a variable speed valve.

If you want to use that valve, you have an input hose and output hose and a PTO supply hose.

Here is the page from Prince .

Prince Hydraulics > Products > Flow Control Valves > Model RD100

You have the inlet /input.

You have control port which goes to the PTO QD.

You have the excess port which will pass any fluid not used to tank.

At one end of the lever travel, you have 0 rpm, or off.

As you move the lever, you cause a certain amount of fluid to flow, and at full lever operation, you are flowing the full GPM from the pump.

The return hose from hyd motor should go to tank.

The directions that come with the valve should be clear and concise.

Did you try and fix your solenoid valve with a new solenoid?

 

[Frank Sorbello]

Does anyone know what this is? The wire coming off the solenoid is attached to it, I think.

 

[Frank Sorbello]

I took the solenoid off the valve. The ground was somewhat attached, the other wire was broken off flush to the base. I have some pictures. Do you think it can be salvaged?

 

[cqaigy2]

View attachment 320586Does anyone know what this is? The wire coming off the solenoid is attached to it, I think.

voltage regulator?

 

[cqaigy2]

I took the solenoid off the valve. The ground was somewhat attached, the other wire was broken off flush to the base. I have some pictures. Do you think it can be salvaged?View attachment 320605View attachment 320606View attachment 320607View attachment 320608

couldn't hurt to chisel out some of the epoxy or resin whatever it is and see if you can get enough to solder a wire onto.

 

[ponytug]

I think that this looks to me like a 12V Sterling Hydraulics Puissant series solenoid type PL or PLE. (The LEs have a built in diode and a red and a black wire. The L series have two black wires. What color is the missing wire?) Solenoid valves , Coils CA - Sterling Hydraulics - PDF Catalogue | Technical Documentation | Brochure

I can't tell from your photos what the ID is, but you may need the ID to match the solenoid.

I don't know if you can substitute this solenoid coil, or this valve.

Based on my soldering skills, if it were me, I would replace it, rather than trying to repair it. I haven't had great luck soldering close to coils.

All the best,

Peter

couldn't hurt to chisel out some of the epoxy or resin whatever it is and see if you can get enough to solder a wire onto.

 

[Frank Sorbello]

Thanks for the info Peter. I went earlier this morning to a Parker Hydraulics store in Delaware. I brought the solenoid with me. The employee couldn't help me at all. Told me I needed to goto a Sterling Truck dealership. I told him Parker bought Sterling Hydraulics and there has to be a way to cross reference. He just gave up.

I know one wire is black. My guess is the other wire is black too, because I don't see any loose red wires anywhere in the tub. The solenoid you found at Surplus Center, how can I find out if that will work with valve I have?

Thanks

Frank