WD 45 Hydraulic pump question.
Printed From: Unofficial Allis
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=208682
Printed Date: 25 Jan 2026 at 11:44am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: WD 45 Hydraulic pump question.
Posted By: IBWD MIke
Subject: WD 45 Hydraulic pump question.
Date Posted: 27 Oct 2025 at 5:45am
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This may get long but stay with me, please. I have a model 73 semi-mount plow. Been here a few years, hadn't used it, decided to take it to the swap meet Friday. Didn't sell. I've gotten all the adjustments free and the tire holds air. Talking with Dave the Plow Man at Lathrop he cleared some things up for me. The 60 series (looking) coulters were available on the early 70 series plows. The bottoms are 375 non-shin units. Shares are unique to that bottom and not great. But, I think I have new ones. If so, they are going on. Might just as well, don't fit any of my other plows. So I'm getting more interested in this silly thing. Another option would be to convert it to slat bottoms. Have several around here loose and a parts plow. I rather like this angle. Having said all that; If you set the hydraulic pump to 'delayed-lift', for the tail wheel, will the traction booster still function?
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Replies:
Posted By: IBWD MIke
Date Posted: 27 Oct 2025 at 5:50am
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Well, how about a 2 for 1? My WFE 45 is getting a bit low on pressure, thinking 3100 psi or so when last I checked. Searching here and looking in my books I didn't find any information. Pretty sure we have discussed 'shimming' to adjust the pressure.
Any insight would be much appreciated. |
Posted By: Lon(MN)
Date Posted: 27 Oct 2025 at 6:47am
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I don't have a tail wheel or gauge wheel on my 73 plow. I use the traction booster and it works great. Look at my website to see the video of me plowing with it. ------------- http://lonsallischalmers.com |
Posted By: DrAllis
Date Posted: 27 Oct 2025 at 8:11am
| I think it might, but you'd have to do some different plumbing. The left lift arm cylinder would have to be connected directly to the right lift arm cylinder, so they would work together. The hose that formerly went to the right lift arm cylinder would have to plug into the hyd tailwheel on the plow. Plumbed this way, the lift arms would come up first, then the tailwheel. Lowering, the arms would drop before the tailwheel. The Traction Booster screw "A" would have to be unscrewed. If you know the TBoost system works now, it would be worth a shot. What you are doing is what the Transport valve was for. Good luck, Mike !! |
Posted By: AC WD45
Date Posted: 27 Oct 2025 at 7:58pm
I was just about to say, when we pulled a 4-14 (model 74?) Semi mounted snap plow, the transport valve was necessary to make the traction booster work properly. Without that, it wouldn't have pulled 4 bottoms in our soil. Several years later, I have a 3 point 2 bottom plow now, the tractor struggles in the same soil type we pulled 4 bottoms through with ease back then. It is incredible how beneficial the traction booster system is to these tractors. That said, I do believe the tractor could be weighted down properly and gain the same traction. But weights are expensive in my neck of the woods and I don't have much of a use anymore for a 4 bottom plow. ------------- German Shepherd dad 1957 Allis Chalmers WD45 #WD234847 1951 Allis Chalmers WD #WD88193 |
DrAllis wrote:Posted By: IBWD MIke
Date Posted: 28 Oct 2025 at 6:53am
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I believe both my 45's have transport valves on them. Thought I had yesterday was to set the pump for delayed lift, raise the plow and see what the T-B gauge does. Worked on that plow a bit yesterday, put new shares on the first and back bottom. Thought I had a full set but was one short. Middle one was in the best shape so it stayed. Looked at the hydraulic hose, was going to change it, have a new 1/2" one. Apparently they were 3/8" originally. Decided to buy one of those and get rid of some of this plumbers nightmare! I have a single-arm coulter project I've been working on and this may be the plow to try that on! Supposed to rain here today. Maybe move it iin the shop before it starts?
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Posted By: IBWD MIke
Date Posted: 28 Oct 2025 at 6:55am
| Any thoughts on increasing the hydraulic pressure? Thought there were shims that could be removed but don't remember where. |
Posted By: DrAllis
Date Posted: 28 Oct 2025 at 7:26am
| Many of those pumps aren't at 3400 psi. 3000 psi will lift anything you are wanting to lift. |
Posted By: SteveM C/IL
Date Posted: 28 Oct 2025 at 8:02am
| Shims are on unloader valve...you need more to increase. |
Posted By: DrAllis
Date Posted: 28 Oct 2025 at 9:25am
| I guess I should xplain this a little better. To raise the maximum unloader valve pressure, you have to add more shims to the unloader valve OR replace unloader valve parts that are worn or a combination of both. This requires a complete removal and teardown and resealing of the pump to make this happen. If the max pressure is low enough your lifting power is inadequate, then it's time to do something. 3000 psi isn't low enough for me to want to spend the time or $$$$$ to get 400 more psi. |
Posted By: IBWD MIke
Date Posted: 29 Oct 2025 at 6:01am
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Okay, thanks guys. Resumed working on the semi-mount plow yesterday. Got the single-arm coulter mounted on the back bottom. Not sure I like it or that it will even work but it might. Dug some later style 70 series coulters out of the parts stash. Should have enough parts to make a good set with nice tight hubs and bearings even. Polished up the ram on the cylinder a bit. Thinking about pulling the moldboards off to tighten weld the leading edges.... Crappy day here so who knows what might happen in the shop?
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