John Deere 401C Hydro trouble

[85bj60]

Local dealer is no big help! That's a pricey housing I will have to check if housing is good. Thx for replying

 

[true temper]

What makes you think its bad.

 

[85bj60]

I've bypassed it and everything was working like it suppose to. I reconnected it after taking it apart to make sure no dirt was in it. I also plugged the rear selector to take it out of the equation and it's back to the woes again.

 

[Zebrafive]

I've bypassed it and everything was working like it suppose to. I reconnected it after taking it apart to make sure no dirt was in it. I also plugged the rear selector to take it out of the equation and it's back to the woes again.

How did the internal parts look? How did the valve fit the bore of the housing? Loose? Tight? Seized? If I were to "throw" parts at it, I would start with the spring, then the internal valve assembly.
Or try and find a used complete valve.

 

[85bj60]

I found it to be tight when re-inserting and was slipping up & down by gravity at times. There was some wear marks but not really noticeable. Spring length was just a tad short of 4 5/8". There was a third shim which was slightly bigger than the other two. I placed it at the other end against the plug in case it rubbed on the valve. I would have to know if the housing is in good shape before throwing some parts into it. My neighbor has a pressure regulator which I can adapt to it if I choose to go that route.

https://static-assets.imageservice....bout-safety-valve-and-vacuum-relief-valve.png Something similar to this

 

[Tx Jim]

If it was my tractor & hyd operated well by bypassing pressure control valve I'd just leave it bypassed. My understanding is pressure control valve is designed to give priority hyd pressure to power steering. Simple solution don't operate any other hyd function while turning steering wheel then hyd problem solved.

 

[85bj60]

If it was my tractor & hyd operated well by bypassing pressure control valve I'd just leave it bypassed. My understanding is pressure control valve is designed to give priority hyd pressure to power steering. Simple solution don't operate any other hyd function while turning steering wheel then hyd problem solved.

Sounds like a super simple solution and hopefully doesn't causes problems down the road. I'll add a T so I have flow to my rear selector. Adding the mentioned pressure regulating valve will give me peace of mind of not over pressuring the system on my doing. :thumbsup:

 

[Tx Jim]

My knowledge of JD "utility tractors" is limited BUT on AG tractors with a similar pressure control valve this PC valve doesn't control system pressure. As I previously stated PC valve provides hyd priority pressure to power steering. The stroke control valve in frt hyd controls system hyd pressure. Does your 401C have a 3 pt hitch??

 

[85bj60]

Yes, it does have a 3pt hitch! When time permits me to redo the hydraulic routing I'll report back on the findings. Thx again

 

[Tx Jim]

Isn't 3 pt hitch supplied hyd oil via a galley in trans case supplied by hyd pressure from pressure control valve?