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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | Williams pumps are piston type pumps, your 800 series is an 8 piston model. NONE of them regardless of 2, 4 or 8 piston will withstand over 1000 RPM or continuous usage or they will come unwound. They can develop 3000+ psi and often are seen with a control valve located on to[p of the oil reservoir. I think it is still a current model. The PRM restriction is why they are not used on highway trucks. It is fine for the old type scissor hoists, etc seen on farm trucks. In all likelyhood they will sell parts direct. Keep this pump clean! | | |
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