WD45 Hydraulic Ram MAX Size??
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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=180213
Printed Date: 07 May 2025 at 6:40pm
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Topic: WD45 Hydraulic Ram MAX Size??
Posted By: ssccrab
Subject: WD45 Hydraulic Ram MAX Size??
Date Posted: 30 Apr 2021 at 7:47am
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Hello!! I'm getting some implements ready to pull behind my 1955 WD45 and have heard that most implements had 4x8 rams. I've also read elsewhere that WD45's don't like to push anything over 3" rams, as anything over that is very slow acting. So, I'm curious as to what the maximum bore size is that I could use with my WD45..? Will 4x8's be okay, but just really slow? Or should I step back down to a 2" or 3"? Thank you for the help!
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Replies:
Posted By: DrAllis
Date Posted: 30 Apr 2021 at 7:59am
| 2 inch or LESS and they should be "high-pressure" cylinders. |
Posted By: steve(ill)
Date Posted: 30 Apr 2021 at 8:13am
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a 2 inch ram running at 3000 psi will put out around 9000 pounds of force. No need to go bigger. ------------- Like them all, but love the "B"s. |
Posted By: wjohn
Date Posted: 30 Apr 2021 at 8:27am
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The WD-45 manual says "do not use rams with more than 40 cu. in capacity." I presume this is based on available capacity in the hydraulic reservoir? I think you'll find that's much smaller than a 4x8. However you generally have higher pressure with a WD-45 than you do with most tractors' hydraulic systems, so you'll have more force available to lift with the same size cylinder (As DrAllis mentioned you must have a cylinder rated for that higher pressure, though). Most good cylinder companies will have specs for their cylinders that provide volume of fluid and the force at varying pressures. An implement designed to be lifted with a 4" cylinder by a tractor with a 2000 psi system can be lifted with a smaller cylinder with a 3500 psi system. You could compare force specs at the higher AC hydraulic system PSI on the cylinder and see how small you could go and keep the same force... Assuming your hydraulic system is in good shape. Another thing you might be able to do is limit the stroke (on a new cylinder rated for high pressure), so that not as much volume is needed. If your implement needs the full 8" stroke then this is out. I've been looking into this recently since I have an old IH disk that has a 3.5" x 8" cylinder which is too large for a WD/WD-45 system, per the book. 2.5" is right on the line from the math I did, if my hydraulic system is in good shape. I haven't decided what to do yet. This all being said, who knows... Maybe guys have run big cylinders before with no ill effects on the tractor, but I don't think I'd do it. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: CTuckerNWIL
Date Posted: 30 Apr 2021 at 8:45am
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I have used a 4x8 Oliver 2 way cylinder on my 45 with the planter before. First I vented the back(down side port) of the cylinder, then I made sure not to let it hammer on the top of the stroke, by going to the hold position as soon as the planter was up high enough to turn. I also had to stop at the end to wait a couple seconds for it to raise. ALL hydraulic cylinders are rated for max pressure, but that is considerably lower than what the will actually take, before a problem exists. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: DrAllis
Date Posted: 30 Apr 2021 at 8:46am
| From memory, I think the largest diameter 8 inch stroke cylinder for a WD-45 was 1 1/2" or 1 3/4" for implements. |
Posted By: corbinstein
Date Posted: 30 Apr 2021 at 9:03am
| could you add overflow capacity to the hyd reservoir/transmission? ie a remote tank at the same height? |
Posted By: steve(ill)
Date Posted: 30 Apr 2021 at 9:04am
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You can use a low pressure cylinder for a disc as Charlie said... A system that puts out 3000 psi pressure might use just 800 psi to lift a disc.. As long as you dont STALL OUT and go over relief at the end of stroke, you have no problem. An old 1.5 or 2 inch cylinder is fine for a disc. ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 30 Apr 2021 at 9:09am
| The A-C high pressure system was 50 or 60 yrs ahead of it's time !! Modern tractors now have 2,900 psi systems to avoid having to go to larger than 4 inch diameter cylinders. I used a friends 13 ft disc behind my WD45 with a 2 1/2" tie rod cylinder and just made sure I didn't raise it 100% at the ends of the field. Got along just fine. |
Posted By: PaulB
Date Posted: 30 Apr 2021 at 2:39pm
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I have these used Allis Chalmers Hi-Pressure cylinders available. Edit: The top smaller cylinder is sold. The bottom 3 are still available.
 The top 2 are smaller than the 3rd one. The bottom one is a 2 way type.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: DrAllis
Date Posted: 30 Apr 2021 at 5:41pm
| Just checked my WD45 owners manual and it lists 1 3/4" for the remote ram size. |
Posted By: wjohn
Date Posted: 30 Apr 2021 at 9:21pm
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The other half of the equation is what were the factory cylinder sizes for the implements you want to run? A 1 3/4" cylinder probably lifted any implement AC had in the '50s, so if you have AC implements you're probably good. I don't think that size of cylinder would lift my '70s IH disk even at a WD/WD-45's higher pressure, however. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |