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mmischni

Landlord with loud bangs when on the clutch

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mmischni
Hi guys, Posted this question some time ago and got some ideas, but none panned out. My '64 LL makes occasional loud bangs when in gear and letting out the clutch. It occurs when going from forward to reverse and vice versa. It seems like it happens when the clutch is loading/unloading, but not regularly. For something like mowing, I never hear it, but riding the clutch blowing snow or backing into the garage, I usually get a couple big bangs. They are not clunks like loose frame halves or sloppy wheel/axle parts, but nice sharp, high-energy bangs like striking the frame sharply with a ballpeen. Seems like it must be coming from something fast moving, but I am stumped. The driveshaft is fast, the BGB, as is the clutch idler and tranny input. But I can't see anything wrong/loose/misaligned on these parts. The BGB gears look really good. No missing teeth. Any of this sound familiar to anyone? Any ideas of what it could be? Thanks in advance! Matt

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Al
Matt, Does it have the two piece pulley on the bevel gear box? Are the 2 plastic pieces, one on the inside of the floating half and the piece between the floating half and the outside plate goo? Are you using an OEM wrapped belt? If these plastic bearings are bad this can cause this. They are there for soft start and perform an important function. My first thoughts. Al Eden

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mmischni
Hi Al, Yes, it is the two piece pulley. i never thought about that part of the drive. I will have to go take a look at that pulley and see what I can see. I am using an OEM belt. So the function of this is to allow a little slip to soften the engagement of the drive? Looks like 157033 allows the outer pulley half to slip on the inner half hub and then there are two thrust washers on the outside (157032 and 157150). So if the thrust washers are gone, is it the banging of the half pulley against the next pulley that makes the noise? Hope these parts are still available! Also I have a second pulley on the outside of the first, before the pull start flange. What was that from? Part of the long dead hi-lo?


Thanks!

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Al
Matt, I believe that pulley was part of a rear vacuum attachment. There should be a strip of plastic that goes inside the floating flange. This is the bearing it turns on. Then there should be a flat round plate behind the rope pull pulley. Between this plate and the hub of the fixed flange should be a round plastic disk. The floating plate can turn and this really lets the belt drive primarily from its left side until the idler is tight and then the expansion of the belt when it bends around the pulley pushes the floating flange out again the plastic disk which drives the floating plate. Once the belt is tight and a load is applied to the pulley it functions like a conventional V pulley. When engaging the clutch, it is much smoother than a regular V pulley. They were discontinued in the later tractors. I will try to remember to check if I have these in stock Monday. I normally have kept them over the last 25 years. AL Eden

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