Cavitation

[TEKelly]

I recently purchased a White 2-135. When it first starts there seems to be no fluid in the hydraulic pump and it cavitation. Is there a check valve that prevents all of the hydraulic fluid from running back into the transmission? Or could it be something else?

 

[rrlund]

I'd have to look it up to be sure anymore, but I think that had a charge pump in behind the main pump didn't they?

 

[TEKelly]

I'd have to look it up to be sure anymore, but I think that had a charge pump in behind the main pump didn't they?

Not sure. I've been told to change the hydraulic filter and something about a screen in the rear end. Would really like to fix the problem before something happens to the pump. I was told the pump was changed. Would make sense since it's blue and not black like everything else.

 

[TEKelly]

I'd have to look it up to be sure anymore, but I think that had a charge pump in behind the main pump didn't they?

Thanks for trying to help.

 

[tom upton]

Yes they have a charge pump. Does it only sound lke it is cavitating after it sits for a day or so or does it do it if you shut it down and then restart shortly after? It could be the seal or an air leak on a suction line, but before I would tear into it especially since pump has been replaced and maybe new pump compensator not set correctly I would go that route first. Simply turn compensator screw counter clockwise a 1/4 turn or so to see if noise diminishes on start up. If it does then get yourself a guage to plug into a remote and someone who knows how to set it or read some of the old posts on compensator setting.

 

[TEKelly]

Yes they have a charge pump. Does it only sound lke it is cavitating after it sits for a day or so or does it do it if you shut it down and then restart shortly after? It could be the seal or an air leak on a suction line, but before I would tear into it especially since pump has been replaced and maybe new pump compensator not set correctly I would go that route first. Simply turn compensator screw counter clockwise a 1/4 turn or so to see if noise diminishes on start up. If it does then get yourself a guage to plug into a remote and someone who knows how to set it or read some of the old posts on compensator setting.

Thank you sir. I learn a little more every day.

 

[TEKelly]

Thank you sir. I learn a little more every day.

I'm not sure if it does it after setting for a short time since I have been afraid to run it because of this problem. Where is said compensator screw located? Perhaps I should aquire a manual. Is the charge pump an electric pump? Should I hear a noise from a pump when I turn the key on?

 

[tom upton]

I'm not sure if it does it after setting for a short time since I have been afraid to run it because of this problem. Where is said compensator screw located? Perhaps I should aquire a manual. Is the charge pump an electric pump? Should I hear a noise from a pump when I turn the key on?

No its not electric. Yes you should get a manual . Compensator is attached to the blue pump you were talking about with 4 socket head screws the adjstment screw is on the end of it. It may look like attached pic or it could be a small srcew with or without a jam nut on it or it could be a hex nut depending on vintage of pump that was replaced. If memory serves me correctly in some industrial applications they had a hex cover nut that you removed to access the compensater screw, but I doubt yours would have that.

 

[TEKelly]

9

 

[TEKelly]

This is what is on my pump