Eaton Power steering pump O ring size??

Kellyc

Member
I have seen it on a image posted for the Char- Lynn 544 parts list.
It looks like it is part 736. It also looks like it gives the size.
But when I zoom in enough to see the size. Its distorted too much.
I have plenty of the right inside diameter O rings. But every one I try leaks. So the OD is too small to seal the cylinder.

Any one know the size? Save me buying another hand full of O rings.
 
I measure them with a dial caliper.

Get the "cord size" of the o-ring (its diameter)

And then the ID has to stretch slightly over whatever it goes on for it to work right.

A face seal is a little different, but you can usually get the OD of the donut by a little trial and error with measuring and get down to a couple of dash-sizes.
 
736 is an o ring sized at 1-1/16 od x 1/8s. o ring 737 is 2-3/16x 3/32s these came from my 554 manual.
 
Do yourself a favor and get a seal kit for it. Especially if the orings you are looking for are for the in
and output shafts they are quad rings. I got mine from a place in MO. The one on my M has been
together 3 years and no leaks yet. By no means heavy use 3-5 hours 4 or 5 times a year. See link.
Midwest Steering
 

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