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Discussion Forum

WD45 transmission

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04-10-2002 18:44:33

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Does anyone know what makes the WD45 slip out of third gear? A worn gear, Bushing, or coupler?

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04-11-2002 19:03:59

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 Re: WD45 transmission in reply to Michael, 04-10-2002 18:44:33  
The gears are not in mesh all of the time. If they were, they would not have worn edges. They get that way from shifting and engaging without coming to a complete stop. Grinding the gears. The forks that are moved by the shift lever move collars that are part of certain gears which engage other gears. With age, the gears, collars, and shafts wear and too much clearance develops between parts, allowing for them to disengage. A constant mesh transmission was way beyond the technology of the 50s. AC had very basic sliding gear transmissions, just like all of the others of that era.

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04-12-2002 19:19:41

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 Re: Re: WD45 transmission in reply to JMS/MN, 04-11-2002 19:03:59  
WCs,and WDs up to a point had sliding gear transmissions, later WDs and all 45s had constant mesh transmissions. Any WD with a curved shift lever is a constant mesh transmission. The parts book lists two different sets of parts for the two transmisions and almost all of the parts are not interchangable. Maybe the transmission cover and some of the shift rails, but I am not sure of them without checking. There is no special technology needed for a constant mesh, just different parts.

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04-12-2002 22:03:48

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 Re: Re: Re: WD45 transmission in reply to Tom, 04-12-2002 19:19:41  
Tom, I would disagree with you, and maybe we have different interpretations of what a constant mesh transmission is. To me, constant mesh means the gears are always in contact with one another, and always turning, and are engaged by clutches. There are no clutches within the transmission. There are no synchronizers in the transmission. That's what makes for smooth speed changes. I don't believe all gears in the WD or WD45 transmissions are always turning, otherwise how would there be forward and reverse?. The main difference between WD and WD45 transmissions is that the WD has straight-cut gears, and the WD45 has the angle-cut gears, thus allowing for a faster shift from one gear to another. You talk about collars. Those collars are a part of the gears that slide to engage other gears that are not yet turning- thus the need to push in the foot clutch to shift the gears (allowing them to stop before engaging other gears that are not yet turning.) The reason an older tractor pops out of gear is because wear has developed over the years, and can only be fixed by replacing those worn parts. They didn't pop out when they came from the factory.

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Brian G. NY

04-13-2002 07:04:21

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 Re: Re: Re: Re: WD45 transmission in reply to JMS/MN, 04-12-2002 22:03:48  
You have to look at a parts breakdown or (better yet) a dissassembled tranny to see what these other guys are talking about. I think the only gear that slides in most "constant Mesh" trannys, is reverse. The "shifting Collars" are "toothed" but they are not "gears".

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Farmer Brown

04-19-2002 10:09:18

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 Re: Re: Re: Re: Re: WD45 transmission in reply to Brian G. NY, 04-13-2002 07:04:21  
Tom and Brian are correct. It is collars that are being shifted, not the gears, so it is considered a constant mesh transmission. (helical gears run smooth but don't shift well) Not synchronized or power shift, but constant mesh none the less. Small consolation if it is slipping out of gear.

Your problem may or may not be wear on the collars from shifting. Does is pop out of gear going down hill? If so, I would suspect worn tapered roller bearings that hold the shaft in place. Worn bearings can cause enough end play to cause shifting type action. This is a problem that started with this helical transmission in '53 that the early ones did not have. (spur gear don't create any end thrust, therefore no wear in the axial direction)
Going down hill (with the engine holding you back) loads the collars in the direction that they usually don't have much wear, so if it pops out of gear there it is more likely the bearings.

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04-11-2002 17:20:14

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 Re: WD45 transmission in reply to Michael, 04-10-2002 18:44:33  
The gears are in mesh all the time. Shifting the transmission shifts dog clutches that engage the different gears. These are just notches in one hub that engage notches in another hub. The edges of the notches get worn from grinding gears and then they won't stay where you put them.

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