Hyd cylinder question
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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=148994
Printed Date: 21 Aug 2025 at 11:25am
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Topic: Hyd cylinder question
Posted By: Mikez
Subject: Hyd cylinder question
Date Posted: 31 Mar 2018 at 8:22am
| Hi everybody. I'm going to put a hyd ram. On my rake to fold up the curtain for road travel. Was going to plum it with 1/4" line so it works slow. When I inquired on the cylinder he asked 2500psi or 3000psi. Even though its not lifting much weight and plumed with 1/4" line the tractor still supply's same psi right. |
Replies:
Posted By: jaybmiller
Date Posted: 31 Mar 2018 at 8:27am
|
Yes , pump pressure is 'fixed' or 'set' at the pump. Given the choice, I'd go with 3000# cylinder, as it should be physically a better cylinder but.... what's the PSI of your tractor ? ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: KJCHRIS
Date Posted: 31 Mar 2018 at 8:28am
|
Yes, the PSI will remain the same, the flow or GPM will be slowed a bit. ------------- AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B, |
Posted By: Mikez
Date Posted: 31 Mar 2018 at 8:38am
| Well it's an allis of course haha. It would be on anything from our D-17 200 to 6080. Ok how about rod size. It will be a 12" throw. And he asked if I wanted 2",2.5" or 3" barrel. |
Posted By: Gerald J.
Date Posted: 31 Mar 2018 at 10:23am
|
The available push force of the cylinder is the available psi times the area of the piston, pi r*r. 2" diameter is 1" radius and the area in 3.14 square inches, so 9000 pounds force with 3000 psi. 6000 pounds force with 2000 psi. 2.5" diameter pushes 14,700 pounds with 3000 psi and 9800 pounds with 2000 psi. 3" diameter pushes 21,200 pounds with 3000 psi and 14,100 pounds with 2000 psi. The piston area when pulling is reduced by the diameter of the cylinder rod. 2" cylinder probably has a 1" rod, but that is a variable. That makes the pull piston area 2.36 square inches so 3000 psi pulls 7000 pounds and 2000 psi pulls 4700 pounds. The piston rod in the 3" cylinder could be as big as 1.5" so the pull area is reduced from about 7 square inches to 5.3 square inches and the pull force is that much smaller than the push force. Go to Baum hydraulics for a wider selection of cylinders. http://www.baumhydraulics.com" rel="nofollow - http://www.baumhydraulics.com Gerald J. |
Posted By: SteveM C/IL
Date Posted: 31 Mar 2018 at 1:18pm
| Is the 17 a ser 4 with low pressure? A high pressure AC cyl will make a "tool" JUMP when fed with low pressure high volume system,if it has the ability to lift the load to begin with. |
Posted By: Mikez
Date Posted: 01 Apr 2018 at 10:04pm
| Thanks, I'm not worried of the weight it's lifting, can't be more then 100lbs. But maybe if I had the smaller one and the bouncing around the field, it would damage itself. |
Posted By: Gerald J.
Date Posted: 02 Apr 2018 at 9:19am
 The smaller diameter cylinder will move faster for a given pump flow and if given the full flow of the tractor pump might eventually damage itself from hitting the end inside. That can be controlled with a flow control valve to limit the oil flow rate. When I mounted a MF loader on my JD 4020 and added connections for a three point back hoe, I included flow control valves so I could get a controlled motion rate without having to operate the hand valves just barely opening them. Gerald J. |
Posted By: Mikez
Date Posted: 09 Apr 2018 at 11:16pm
| Thanks Gerald ill keep that in mind. I put up the extra money and got US made cylinders coming |