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Hi All! Here is a long overdue update. The P/S option was made by Modular Controls, of Villa Park, IL. They were bought by Vickers in 86, and then Eaton, sometime after that. The kit was OEM by ARPS, Corp., which was bought out by the employees and is now in business as Amerequip. The hydraulics in the kit were supplied by TjBrooks, of Chicago, which is now Hanna-TjBrooks of Libertyville, IL. Hanna-TjBrooks no longer supports the part.
So.... I completely disassembled and mic'ed every piece of the valve and cylinder. Got new seals and back-up rings from a variety of vendors, and a new LOCK WIRE, which was a new experience for me (it secures the Gland end instead of having a threaded Gland Nut). It's back on the tractor and working great!
Cause of the failure was an integrated ball-and-spring pressure-regulator that has an adjustment that had backed out, providing almost zero pressure to the steering assist. Thanks to everyone, especially Auerbach, who provided help! Cheers! Miles.

Looking for manual for Yanmar Power Steering
Yanmar Tractors
Replies 13 Post by bentbreeze

[QUOTE=auerbach;163578] What's his PS problem? I have the factory parts/owner's manual for the "YPS 226" (the add-on PS for my 226, likely similar). [/QUOTE]

Could you please send me the drawings from the manual? My neighbor's power steering went out and I plan to try to repair it for him if it's within my capabilities. The cylinder has had hose clamps on it since he got the tractor several years ago, but the power steering stopped working last fall.

Yanmar 187D information
Yanmar Tractors
Replies 22 Post by bentbreeze