How Does an M&W Hand Clutch Work?
Posted 06 May 2008 - 09:40 AM
discbine WDX1902 Milking 65 cows in NY
Posted 06 May 2008 - 07:24 PM
Dad bought an M with a hand clutch, it slipped so we removed it. Exactly how do these work? Are you not supposed to use the foot clutch anymore, or just use the handclutch when stopping for example. Do they slip the rear end or?
You should use the foot clutch. The only time you should use the hand clutch is when you are doing PTO work and need to stop the tractor without interupting power to the PTO, like baleing or combining. If yours slipped, it may just need to be tightened a little. Over time the fiber discs will wear and the clutch will not lock tight. Just take off axcess cover, tighten the nut untill the clutch lever engages with about 30 lbs pressure and that should take care of it.
I'll try to describe how they work.
Original pinnion gear is solid, replacement pinnion gear as part of clutch assembly has a hole in the middle. One end of the pinnion gear is splined to mate up with a drum. The drum has teeth around the inside of it. A standard brake band goes around the ouside of the drum, because the drum is attached to the pinnion gear, original band brakes still work. There is a special shaft that is splined on both ends that goes through the center of the drum, through the pinnion gear and into the differential. Now the clutch discs, first there is a steel pressure plate that slides on the splined shaft, then a fiber disc (similar to a steering clutch disc in a crawler) which fits the splines in the drum. Next a thin steel disc goes on the shaft, followed by another fiber disc, a second steel disc, third fiber disc and finally a steel pressure plate. There is a special cam assembly that goes on the shaft and is held in place with a nut. One half of the cam is held stationary by the cover and the other half rotates a little when the handle is moved forward and back. The rotation makes the cam go in and out a little, thus putting pressure on the clutch discs and engageing and disengageing the clutch. When engaged, the hollow pinnion gear and shaft running through it are locked together via the clutch discs. With the cluth disengaged, the shaft is free to turn inside the pinnion gear, which is now stationary, thus stopping the forward motion of the tractor. All the trannsmission gears are still turning, so don't try to change gears without using the foot clutch!
1928 10-20, 1929 McCormick Deering 22-36, 1929 Regular, 1931 Regular, (2) 1935 F20s, 1935 F30, 1935 W30, 1935 F12, 1935 P12, 1936 F30, 1937 F30, 1942 H, 1947 M, 1950 M, 1956 400, 1950 L160 truck, 1956 S162 truck