massey 85 steering pto

redhorse pa.

New User
The power steering is eradic and the pto only works in ground spd. put pressure gauge and flow control on top front steering control valve, 4g.p.m flow and 1750 p.s.i. when restricted. Put pressure gauge on at pressure switch only 140psi need more than 150psi to operate pto. Assumed the relief valve was stuck shut got it out without splitting with a crowsfoot (from a post in your archives)Tks. It appeared o.k.and not stuck so put it back in same pressure. Thinking about checking power steering control valve. Any comments or advice would be appreciated. Also doesn't seem to be any parts available for the old orphan. It is my brothers tractor he isn't in a real hurry but it has kind of stumped me they were kind of unique. Thanks in advance.
 
There are two pressure control valves, the higher pressure power steering valve, and the lower return oil PTO pressure control valve that's located in the transmission front cover. The valve you checked is the power steering valve. There's a chance the S shaped oil line from the transmission cover to PTO control valve has popped out of place too. It can be seen at the front with the power steering pump/plate assembly removed.
 
My super 90 messed up and the gear had come loose on the PS pump. Probably not the problem but it only took a few minutes to check.
 

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