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If you're having problems with the power steering and loader speed the common denominator is hydraulic pressure and / or volume. I'd suggest you test the pressure first. If you don't have that capability then drain your hydraulic fluid and check the suction screen and secondary filter if equipped.

I had a 950 back in the 90's and don't believe it had a secondary hydraulic filter.
 

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i just got a pressure gauge on the loader outlets and it was about 200 psi. on the rear pump all the way revved up i was reading 500 psi. Does that sound right ?? or should it be in the thousands?
Your hydraulic pump pressure relief valve may be stuck open. Possibly some sludge or other debris, otherwise it could be a bad hydraulic pump but I tend to doubt it. Maybe a bad or slipping pump coupling.....? I'd remove the hydraulic pump and inspect it.

You may also want to disassemble and inspect the power steering flow divider pressure relief valve. Maybe the adjustment loosened and backed off.

Lastly, depending upon which SCV you have you may have a pressure control issue. Some have spring loaded pressure control valves.

850-950-1050 PS Pressure relief valve
 
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You could remove the power lines and check to make sure they're not collapsed and restricted.

You can take the power steering control valve apart and inspect it. It's installed in place of the drag link. Old school power steering assist.

PS Control Valve

Also, some good news. The steering assist cylinder is repairable.

PS cylinder

The above information is based upon your 850 S/N being greater than 16001. If your S/N precedes 16001 then here's the link for additional information.

850 up to S/N 16000
 
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I think its an 855 He's got.
They don't have that part you showed as/drag link.
There is no steering box . Its all lines on a 955 which is what His late model 855 is based off .
Just a wheel to wheel tie rod and a hydro cyl mounted to front axle.
Good eye Duke. I was coming back to the thread after a few days and was positive it was an 850. Will have to dig back in and provide some updated information.
 
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Hang on the the old steering gear. They can be easily resealed and the kits are still available.


Sent from my iPhone using Tapatalk Pro
 
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