Hydraulic motor keeps pushing seal out.

[oldnslo]

Can you cite a source for this info or provide a particular hydrostatic pump/motor combination that operates at a system pressure anywhere near that value?

Rick,
I never said the system pressure was 30 PSI. I believe I stated the seals where rated to 30 PSI. The reason for this is that by design axial piston pumps and motors require a case drain. The shaft seal only see case pressure on this style of pump or motor. Some of them will allow momentary case pressures of 150 PSI. I believe these are held in by retaining rings and have a heavy steel housing. I was trying to use this as reference for the pressure rating of lip seals.

I realize that this is not an axial piston product but the lip seal style is still very similar.

 

[guitarman]

For me just give a holler if you get it solved like to know someone got a problem fixed

 

[RickB]

Rick,
I never said the system pressure was 30 PSI. I believe I stated the seals where rated to 30 PSI. The reason for this is that by design axial piston pumps and motors require a case drain. The shaft seal only see case pressure on this style of pump or motor. Some of them will allow momentary case pressures of 150 PSI. I believe these are held in by retaining rings and have a heavy steel housing. I was trying to use this as reference for the pressure rating of lip seals.

I realize that this is not an axial piston product but the lip seal style is still very similar.

That is all correct but very different from what you posted. There are also many, many pumps and motors built without case drains. Not that more shouldn’t have them.

 

[wdchyd]

And I think he has an internal high pressure leak. We are both speculating.

Yep, Rick nailed it early in this thread, gonna need the complete seal kit as the motor needs to stripped apart, the high pressure seal area on the shaft will need to be checked for corrosion and wear (should look pristine).

 

[4570Man]

I was going to order a seal kit but a seal kit is $66 from the mower shop. There’s not anything but o-rings that I can get for a couple dollars inside this thing is there?

 

[RickB]

Do you really want to dick around trying to match o ring dimensions and hardnesses with old, flat dried up originals to work with? Do you put any value whatsoever on your time? Do what you want. For me, I’d be forking over the $66 or finding a less expensive OEM seal kit from the manufacturer of the motor itself.
You gotta be able to tell the difference between saving money and tripping over dollars to pick up dimes.

 

[wdchyd]

I was going to order a seal kit but a seal kit is $66 from the mower shop. There’s not anything but o-rings that I can get for a couple dollars inside this thing is there?

$66 is a reasonable price for this kit. The seals in these wheel motors are not regular orings. I have a respectable inventory of hydraulic seals in stock but only use OEM seal kits for hyd motors, they are different. Like RickB said don’t trip over dollars to pick up dimes.

 

[4570Man]

Does anyone know of a better place to get the seal kit? I’d about decided to pay the $66 but then they wanted $16 shipping. That’s highway robbery. This would first in a padded envelope and ship for $2.

 

[oldnslo]

4570,
Are there numbers or a name plate on the motor that might help identify who made it. Problem is that a lot of companies that built that style of motors 20 years ago have been bought up so without a manufacturers model code you may be stuck with Grasshopper prices.

Some examples of the those companies are: White, TRW- Ross, HPI Nichols, etc.

 

[4570Man]

I think it’s a Parker motor but I don’t remember for sure.