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mbir3416

BLOWER BELT HELP!!!

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mbir3416

I have a 3416 with a 42 blower that I cant keep the belt from rolling over on the crank pulley (front pto)

I had a 36 blower last year with the same hitch and had no problems

replaced the pto brg this fall and put on the 42 blower and now the belt keeps rolling over on the pto crank pulley

looking down on the front of engine it looks like the crank pulley is too far back. But the engine was not and has not moved. replaceing the pto brg did not change any dimention that I can see

what am I missing

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MPH

Not sure what to call it, I basicly watch the belt to make sure it is coming into the crank pulley "Square" Straight?? If the pulley mounts are bent the belt will be coming in twisted, thus more likely to roll.

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mbir3416

Thanks for the advice and what to look for

I did adjust the pivots some and still couldn't get it to stop rolling the belt

Put on the 36" blower with same hitch and the same belt and it works ok

the only thing that I did notice is the rear hitch pins are worn wobbled out holes and with the 42" it seams to allow for a greater change in alignment.

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RayS

If it works on the 36" blower with the same belt and hitch. There must be a problem with the pulley or something on the 42" blower head. Because they used the same belt and hitch for both the 36" and 42" blowers.

If the holes are worn you can drill the next size up (7/16") on the hitch and blower or try getting the holes in the blower head back to size. If you have a 3/8" piece of aluminum rod or a wooden dowel. You could slide it between both holes, weld around each hole and then grind smooth.

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BLT

Doesn't the snowblower drive pulley positioned correctly with the hub facing the spout front drive PTO and the hub facing away from the spout with mid pto PTO drives. Something rings a bell in my mind.

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PhanDad

First, BLT is correct about the direction of the snow blower driven pulley hub direction. The early RBT tractors used the 2 pulley hitch and front engine mounted PTO. The pulley hub was TOWARD to drive chain (left, sitting on tractor). When the switch was made to the single pulley hitch using the mid PTO, the pulley hub is AWAY from the drive chain. This is clearly illustrated in the parts diagrams for the old vs new mfg#s. This is a pic of the single pulley hitch with the hub correctly positioned AWAY from the drive chain:

IMG_5394a.jpg

There is a post showing an older RBT blower mounted with a single pulley hitch with the pulley hub TOWARD the chain drive. The belt runs at a severe angle with that setup.

IMG_5394a.jpg.195e11aa9e41a883d53740e49c4bb02e.jpg

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PhanDad

Second, there are 2 types of RBT 2 pulley hitches. There are some slight differences as some have mentioned as to the angle of the pulley pivots. Some pics follow that attempt to show the differences. I believe both of these hitches are factory and not abused. I don't know which hitch is newer or the mfg# of either.

7000Series_HitchDifferent_0001.jpg

7000Series_HitchDifferent_0002.jpg

7000Series_HitchDifferent_0003.jpg

7000Series_HitchDifferent_0004.jpg

7000Series_HitchDifferent_0005.jpg

7000Series_HitchDifferent_0006.jpg

7000Series_HitchDifferent_0007.jpg

7000Series_HitchDifferent_0008.jpg

And as Ray stated, the hitches are the same for 36" and 42" blowers. But I don't know if the slight differences in these RBT 2 pulley hitches have anything to do with belt rolling. I do know from experience, that once a belt rolls for some reason, it will continue to roll even if the problem that caused it is fixed.

7000Series_HitchDifferent_0001.jpg.5b9a1805c84edd27b86534534bdd8cca.jpg

7000Series_HitchDifferent_0002.jpg.500ef29299f2a46379248bf9675eef7d.jpg

7000Series_HitchDifferent_0003.jpg.41d584b80642a79edde34951d6904eb0.jpg

7000Series_HitchDifferent_0004.jpg.802ad6b4a462757dc0bfa53dc59e4900.jpg

7000Series_HitchDifferent_0005.jpg.d6774067c9b9cb2f6672b407ebd3c044.jpg

7000Series_HitchDifferent_0006.jpg.a50e16af556d47c95c1aea8b44e1dd83.jpg

7000Series_HitchDifferent_0008.jpg.e88fc1879132115809481d69ff596c2a.jpg

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