was "Tow behind".switch to JD estate tractor

[Lloyd E. Sponenburgh]

There is a local opportunity to buy a used, name brand tow behind
generator that is not working as follows: the engine (4 cyl. White
diesel) is running fine, the generator is not making any output.

I was gifted a nice but non-functional JD estate tractor. 32HP diesel
with all hydrostatic stuff.

The engine runs fine, although I think it's going to need an injector
pump rebuild... stumbles a bit at high speed.

BUT... although every hydraulic accessory on it works perfectly - lift,
blade PTO, accessory PTO, everything - the traction drive will turn the
wheels under no load, but won't move the tractor. You get a little minor
"oommph!" out of it when you attempt to drive, but it won't move in
either forward or reverse.

I noticed that someone had butchered the (very expensive) "neutral"
valves because they were leaking. Thinking this was the problem, I
removed both, replaced o-rings, etc, and _think_ I've made sure the
valves are in the "closed" position (basically welded shut).

Anyone seen this problem? It seems like the pressure is being bypassed
around the traction motor somehow... and the neutral valves still seem to
me like they'd be at the heart of it.

LLoyd

 

[Lloyd E. Sponenburgh]

I was gifted a nice but non-functional JD estate tractor. 32HP diesel
with all hydrostatic stuff.

The engine runs fine, although I think it's going to need an injector
pump rebuild... stumbles a bit at high speed.

BUT... although every hydraulic accessory on it works perfectly -
lift, blade PTO, accessory PTO, everything - the traction drive will
turn the wheels under no load, but won't move the tractor. You get a
little minor "oommph!" out of it when you attempt to drive, but it
won't move in either forward or reverse.

I noticed that someone had butchered the (very expensive) "neutral"
valves because they were leaking. Thinking this was the problem, I
removed both, replaced o-rings, etc, and _think_ I've made sure the
valves are in the "closed" position (basically welded shut).

Anyone seen this problem? It seems like the pressure is being
bypassed around the traction motor somehow... and the neutral valves
still seem to me like they'd be at the heart of it.

LLoyd

BTW... the tractor cannot be moved by hand with the neutral valves
installed, further making me think they're "closed" correctly.

LLoyd

 

[Dave Hinz]

BUT... although every hydraulic accessory on it works perfectly - lift,
blade PTO, accessory PTO, everything - the traction drive will turn the
wheels under no load, but won't move the tractor. You get a little minor
"oommph!" out of it when you attempt to drive, but it won't move in
either forward or reverse.

My backhoe used to seize up after I used it for a while; there was an
overpressure / bypass valve on the pressure side of the pump (well, in
that circuit, was a ways away). When it'd trip, all the flow would
bypass anything useful and just shunt back to the low pressure side.
Sounds like this is what you're seeing?

I noticed that someone had butchered the (very expensive) "neutral"
valves because they were leaking. Thinking this was the problem, I
removed both, replaced o-rings, etc, and _think_ I've made sure the
valves are in the "closed" position (basically welded shut).

Anyone seen this problem? It seems like the pressure is being bypassed
around the traction motor somehow... and the neutral valves still seem to
me like they'd be at the heart of it.

Do you have a schematic that shows, at least in general, where the
various valves are? It sure does sound like an overpressure bypass
that's stuck in bypass mode. Broken spring or somehing; any pressure in
that circuit, it thinks is overpressure?

Dave

 

[Lloyd E. Sponenburgh]

Do you have a schematic that shows, at least in general, where the
various valves are? It sure does sound like an overpressure bypass
that's stuck in bypass mode. Broken spring or somehing; any pressure
in that circuit, it thinks is overpressure?

The parts drawings are available on-line... got them. But the service
manual which shows the schematic is over $100. I'm stuck with the "brute
force" method of trouble shooting, unless someone can feed me copies of the
salient docs.

LLoyd

 

[Lloyd E. Sponenburgh]

The parts drawings are available on-line... got them. But the service
manual which shows the schematic is over $100. I'm stuck with the
"brute force" method of trouble shooting, unless someone can feed me
copies of the salient docs.

I should also add that this is not a "rationally designed" hydraulic
system. EVERYTHING is contained in the transaxle housing. Durn!

LLoyd

 

[Bruce in Alaska]

I should also add that this is not a "rationally designed" hydraulic
system. EVERYTHING is contained in the transaxle housing. Durn!

LLoyd

Lloyd, you should post this question over on the SmokeStak.com board
in the "Traction" and, or "Tractor" Forums.... I suspect you will
find someone, who has either rebuilt or repaired a similar problem.

Bruce in alaska

 

[Mawdeeb]

Dave Hinz <[email protected]> fired this volley in




The parts drawings are available on-line... got them. But the service
manual which shows the schematic is over $100. I'm stuck with the "brute
force" method of trouble shooting, unless someone can feed me copies of the
salient docs.

LLoyd

LLoyd, Toro has a basic hydraulic troubleshooters guide online. It
won't let me post a direct link so try this:

https://landscapersolutions.toro.co...rol=SetCommunity&CommunityID=232&PageID=19523

Type in model Number "22303"

Select any year dingo from 1999 thru 2006

Select manuals button. The PDF is at the bottom. When selected it will
launch their retrival of the PDF.

If that doesn't work email me and I'll send you a copy.

Good Luck

Jim Vrzal
Holiday, Fl.

And yes, I do own one. Best damn money I spent yet.

 

[Lloyd E. Sponenburgh]

LLoyd, Toro has a basic hydraulic troubleshooters guide online. It
won't let me post a direct link so try this:

Ummm... Toro? This is a John Deere. LT350. Are they the same?

LLoyd

 

[Mawdeeb]

Mawdeeb <[email protected]> fired this volley in





Ummm... Toro? This is a John Deere. LT350. Are they the same?

LLoyd

No, but the principles of hydraulics are the same. Just another resource.

Jim

 

[Lloyd E. Sponenburgh]

No, but the principles of hydraulics are the same. Just another resource.

Jim

It's not my living, but I design hydraulic machinery for our plant. What
I'm really looking for is the schematics for the LT350.

Thanks,

LLoyd