WD45 Hand Clutch Slip After Fluid Change
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=140231
Printed Date: 07 Oct 2025 at 4:30am
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Topic: WD45 Hand Clutch Slip After Fluid Change
Posted By: Jdmvafi4
Subject: WD45 Hand Clutch Slip After Fluid Change
Date Posted: 08 Jul 2017 at 2:51pm
I did not see anything like this this posted anywhere so I thought I'd ask.
I had restored he 1953 wd45 a number years ago. It turned out beautifully. Run like a top, no problems no issues.
I had change the engine oil and coolant during the restoration process. I got to wondering last year how long it had been since the other fluids that had anything done to them. I had taken the plugs out and checked before running it and it had fluid in it but what exactly was it?
I crawl under the 45 with my drain pan and wrench and pull the first drain plug. A grayish putty type goop starts oozing out. There was maybe a quart or so then it changed over to water. I repeated this process with the other two drain plugs I found under the tractor. Same results. Now mind you this thing ran fine. No chattering, whining, slipping, nothing.
From what I understand with this 45, two of these boxes or cases are gear boxes. The other one is the hydraulic system. In 1953 two of them would have been filled with something like 90 weight and the other one would have been filled with hydraulic fluid. I had read somewhere on this forum as well as other forums that today's modern hytran fluid is a much superior lubricant than what was availavle in 1953 and it can be used in all of these systems. I figured what the heck, it works in my modern tractor why not.
Got everything topped off and put back together. Started it up and started moving it around. Everything appeared to be working fine, no unusual noise or anything like that. I'm just riding the 45 down my long driveway in 3rd gear and I start to notice I appear to be losing speed. It becomes more noticeable as I start up a slight incline. It gets to where I downshift to 2nd using the hand clutch.
As I pull back on the hand clutch in 2nd gear no forward movement. Try 1st, nothing. I do find if I pull back on the hand cluth with firm pressure even after it clicks in the the tractor will move. The harder I pull back the better it moves.
How do I fix this? 90 weight back in the clutch case? Why did it work with grey goop and water? I have the cover off the clutch. It looks like everything is engaging. Any suggestions?
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Replies:
Posted By: Lester
Date Posted: 08 Jul 2017 at 3:12pm
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You need to take some shims out of hand clutch.
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Posted By: Bill_MN
Date Posted: 08 Jul 2017 at 7:38pm
Yep, you probably had a little corrosion or rust on the discs due to the water in there, and together with the old thick gunk in there probably helped it grip even though it was worn down. Drain and put fresh new hy-tran in it will have a tendency to clean it out and lubricate everything again. As Lester said remove shims
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: HD6GTOM
Date Posted: 08 Jul 2017 at 8:44pm
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Pretty easy to do. Don't lose the shims. If you ever replace hand clutch you will need them. Pull the plug and let it drain at least overnight, a day or two is sometimes good.
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Posted By: MACK
Date Posted: 08 Jul 2017 at 10:05pm
Did you use hydraulic oil or hydraulic wet brake oil? Hydraulic wet brake oil has a additive in it for wet clutches and brakes that the cheaper hydraulic oil does not.
I'm sure clutch needs adjusted also. MACK
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Posted By: Gary Burnett
Date Posted: 09 Jul 2017 at 1:08am
The hand clutch and hydraulics are supposed to have 20W engine oil as well as I remember.May need adjusting too.Does the clutch 'snap' in when you pull it back?
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Posted By: j.w.freck
Date Posted: 09 Jul 2017 at 9:45pm
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mack is right on course.tere is a measurement with a feeler guage for the correct clearances,dont have it avail.i wonder if he strained the oil and checked for crumbled clutch facing material?????
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