M4900 Hydraulic Problems. Power steering, PTO are OK. Everything else weak

[ronv23]

I do not have the WSM

 

[TheOldHokie]

I do not have the WSM

I thoughtcI posted this link earliet. Free and fast.

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=M4900%2C%205700%2C%205700HD%20WSM.pdf

 

[ronv23]

The piece inside does no spring back

I can compress it some and it doesn’t take much effort

 

[TheOldHokie]

The piece inside does no spring back

I can compress it some and it doesn’t take much effort

It wont be hard to compress but it should spring back. You may have found your problem.

 

[ronv23]

That is as far as it springs back should it be flush?

 

[TheOldHokie]

That is as far as it springs back should it be flush?

I have no idea but i would not say "it does not spring back". It does sprung back and what it must do is close off ths relief passage inside the cartridge.

 

[ronv23]

it seems like it closes the passage, it’s hard to tell just by looking at it. Would it either be this valve or the pump?
If I crank it oil shoots out of the hole so that’s good

 

[TheOldHokie]

it seems like it closes the passage, it’s hard to tell just by looking at it. Would it either be this valve or the pump?
If I crank it oil shoots out of the hole so that’s good

My gut says it should not shoot oil but I would hsve to look at the WSM to see how it works.

I am reluctant to call anything bad without a direct pressure tedt of the pump. A bad call can be an expensive mistake.

 

[ronv23]

oil comes out of the relief valve hole with it removed. My steering works great which is
supplied by 1 of the delivery sides of the pump which makes me think it’s not the pump

 

[TheOldHokie]

oil comes out of the relief valve hole with it removed. My steering works great which is
supplied by 1 of the delivery sides of the pump which makes me think it’s not the pump

Those are two separate pumps.

The only thing they have in common is inlet oil supply.

The outlets are titally independent of each other and feed seoarate independent circuits. The relief valve is in the implement circuit and has no effect, good or bad, on the PS.

Have you read the WSM? It describes in simple clear words and diagrams how the pumps work

 

[ronv23]

i don’t know what to do with it

 

[TheOldHokie]

i don’t know what to do with it

Theres only so much help you can get online. Take it to the dealer or an independent tractor repair facility.

Dan

 

[ronv23]

Replaced the Hydraulic pump and problem solved !

 

[TheOldHokie]

Replaced the Hydraulic pump and problem solved !

Super. Did you buy an OEM pump? Messick's wants almost $2500.

Dan

 

[ronv23]

Cheap Chinese one lol

 

[TheOldHokie]

Cheap Chinese one lol

That would have been my choice. Kubota's $2500 price is insane.