CA Supplemental Hydraulic Pump Sizing
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=203989
Printed Date: 05 Nov 2024 at 12:47am
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Topic: CA Supplemental Hydraulic Pump Sizing
Posted By: dfwallis
Subject: CA Supplemental Hydraulic Pump Sizing
Date Posted: 04 Nov 2024 at 3:12pm
What would be a proper target GPM size for a supplemental hydraulic pump for a CA (given limited horsepower)? 10GPM? 15GPM? ? (10GPM ~ 11HP at 2000PSI per one online calculator that I don't really trust)
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1952 CA13092
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Replies:
Posted By: DrAllis
Date Posted: 04 Nov 2024 at 3:32pm
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Depends on the diameter(s) of the cylinders you are going to use. Depends on the system pressures and how much you intend to lift. Depends on if the engine is going to run 2000 RPM most of the time you are activating the hydraulics or 1000 RPM. Depends on what YOU think the lifting speed should be. Whatever you'd do with a tractor that size and cylinders of 2 inch diameter max (1 1/2" might be more suited) 10 GPM will be lightning fast at full throttle. A 400 series loader has a 10-12 GPM front pump and it will lift the loader boom from the ground to full height in 3 seconds !!! and that's filling TWO boom cylinders. Personally, I'd want 5 GPM and no more at full throttle.
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Posted By: dfwallis
Date Posted: 04 Nov 2024 at 3:39pm
It will likely max out about 1200-1500 RPM. I intend to select a low-ish RPM pump and gear it accordingly. Probably no larger than 2-2.5 inch cylinders, ~2000PSI.
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1952 CA13092
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Posted By: Stan R
Date Posted: 04 Nov 2024 at 5:48pm
I'd suggest just direct coupling to the engine (crank shaft or belt) or pto and not deal with any gearbox (extra cost, more hp loss, bulkier system...).
Flow is somewhat proportional to the rpm. Which way are you planning on powering the pump.
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