JD 450B Power Steering Cylinders

[RiverCity]

I have a JD 450B loader that is leaking hydraulic oil out the center of the valve towards front of machine. This is the later version that doesn't have a separate reservoir but gets oil from the trans cooler circuit.
I have all manuals but can't determine how fluid is going through center of the valve. The right cylinder leaks worse than the left.

Any advice or help would be appreciated.

 

[mg2361]

Do you mean the piece shown below?
Please post a picture of the leaking component.

 

[Labparamour]

https://partscatalog.deere.com/jdrc/sidebyside/equipment/59420/referrer/navigation/pgId/200031

Think you mean these (under the seat)?
I rebuilt mine- not many parts.

Not sure where you’re seeing leak…

 

[Labparamour]

https://partscatalog.deere.com/jdrc/sidebyside/equipment/59420/referrer/navigation/pgId/200060

Valve in center of block sends pressure to side whose lever being operated.

Hope this helps..,

Darryl

 

[RiverCity]

Yes Darryl,
I was just trying to post the first image you did.
They are leaking out the center of #12 into the clevis that connects to the steering levers. They are not leaking around the shaft seals.

Looking at the flow diagram in the manual it looks like #12 should seal against #9 internally. I wonder if I should adjust the clevis center to center longer as maybe it is too short to let these contact each other.

I have been tracking down and fixing leaks. Every time I fix 1 it starts leaking somewhere else in the circuit. The latest are these leaks from cylinders.

I really appreciate you uploading these pics and input. I'm somewhat lacking in computer skills.

Thanks,
Dave

 

[RiverCity]

Also where did you find parts. I've found seals and orings but not the v packings or seat.

Thanks

 

[Labparamour]

Gosh, it was 4 yrs ago I did those- no leaks but weak “power assist.”
If you use the Deere link and scroll to the part number, you usually get sites w the part…sometimes Deere, sometimes other vendors.
I think Deere has had most of the seals I’ve needed.

 

[RiverCity]

Thanks Again

 

[RiverCity]

Well that little idea was a bust. Obviously bypassing internally.

Time to pull them and find parts.

 

[Labparamour]

Found receipt. Parts came from Deere.
Not much to them. There is a seal around the shaft the yoke attaches to.

 

[RiverCity]

Thanks I'm mostly worried about the V packings and the seat.
I have a local hydraulic house that can source most anything by size.
I'm counting on them
As always your input is greatly appreciated.

Thanks Again,
Dave

 

[RiverCity]

As to the seat
I'm a retired machinist and millwright. With a reasonably complete shop. If it is metal I can make it or repair it. Just would prefer not to if I don't have to.

 

[Labparamour]

Wanted to add: the folks here on HEF are really knowledgeable.
And, I’ve also gone to JDcrawlers.com

JDcrawlers Messageboard - Index page

 

[RiverCity]

Thanks
And Merry Christmas to All