Loader hydraulics

[jd1520]

This message is a reply to an archived post by JD1520 on February 24, 2014 at 14:15:25.
The original subject was "Re: Loader hydraulics".

OK this is a long time to be getting to the fix but I checked stand by pressure at main pump today and it was only 1850 , I was able to turn it up to 2050 and this has cleared my chatter up completely - but I have the adjusting screw all the way in and can go any higher to get 2200 to 2300 as suggested in the manual - can I shim the top of the adjusting screw to get higher pressure or should I be content as is?

Is this a indication the pump is getting worn out?

 

[jd1520]

This is a 1973 JD1520 and had some chatter occasionally when loader hydraulics operating - was good cold and hot just not when warm - I seemed to have it fixed with the adjustment this morning but only ran it 15 minutes or so afterwards

 

[D-]

Figure on replacing pump.
It does have small pump doesn't it.

 

[buickanddeere]

(quoted from post at 11:22:20 08/09/14) This message is a reply to an archived post by JD1520 on February 24, 2014 at 14:15:25.
The original subject was "Re: Loader hydraulics".

OK this is a long time to be getting to the fix but I checked stand by pressure at main pump today and it was only 1850 , I was able to turn it up to 2050 and this has cleared my chatter up completely - but I have the adjusting screw all the way in and can go any higher to get 2200 to 2300 as suggested in the manual - can I shim the top of the adjusting screw to get higher pressure or should I be content as is?

Is this a indication the pump is getting worn out?

Does the pump go out of stroke and quit pumping at 2050psi? Or is there a leak that bleeds off pressure before reaching 2250psi?
Is there a relief valve in the loader controls?

 

[Tx Jim]

What type valve controls loader?

 

[Tx Jim]

(quoted from post at 11:38:01 08/09/14) Figure on replacing pump.
It does have small pump doesn't it.

D-
Stating that the frt pump needs replacing is a BROAD STATEMENT without correct diagnostics being performed. Many frt pumps on JD CC hyd systems have been replaced when in fact the frt pump was not at fault

 

[tim s]

A weak or worn stroke valve or stroke valve spring will give you what you have going on...

 

[jd1520]

it has the larger 8 cyl main pump, it has the
JD145 loader installed since it was new - original
owner said it came like that from dealer - I
believe they are the original cessna controls for
loader

tractor hydraulics are operating 100% function now
with no chatter but I cant get stand by pressure
over 2050

If its leaking where do I look to check? would
this be the internal hydraulic lines? I would be
suspecting its a weak relief spring or worn valve

 

[jd1520]

6500 hours on it

 

[D-]

That's why I mentioned small pump. They have shorter life span than pump with bearings.

 

[jd1520]

Ran tractor for 1 1/2 hours yesterday and no issues with loader hydraulics - nice and smooth and a bit faster then before - thanks for the advice - looks like it got me pointed in right direction