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Power Steering Pumps

December 13th, 2010 · No Comments

The Saginaw vane type power steering pump can be identified by the “ham can” shape of the fluid reservoir. Internally, rectangular pumping vanes carried by a shaft driven rotor move fluid from intake to pressure cavities of cam ring.
As rotor begins to rotate, centrifugal force throws vanes against inside surface of cam ring to pick up residual oil, which is then forced into high pressure area. As more oil is picked up by the vanes, oil is forced into the cavities of the thrust plate and through two cross-over holes in the cam ring and pressure plate (which empty into high pressure area between pressure plate and housing end plate). Filling high pressure area causes oil to flow under vanes in slots of rotor, forcing vanes to follow inside oval surface of cam ring. As vanes rotate to small area of cam ring, oil is forced out from between vanes.
Loosen pump adjusting bolt (or nut) and pump mounting bolts, then withdraw pump drive belt. Disconnect pressure and return hoses from pump and cap ends to prevent loss of fluid and entry of dirt. Remove bolts attaching pump mounting bracket to engine, and withdraw pump, pulley, and mounting bracket as an assembly. To install, reverse removal procedure and bleed hydraulic system.
Caution โ€” When clamping pump in vise, be careful not to exert excessive force on front hub of pump as bushing may become distorted.


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