bobcat 610 driven sheave assembly

[Yzracer239]

I have a bobcat 610 with a brand new oem driven sheave assembly with tapered shaft I purchased. I had to separate the two haves to slide the shaft into the tapered side of the clutch to tighten down the spanner nut on the shaft. A soon as I separated the two haves and put them down and lost the orientation, I immediately realized I should have put punch marks to keep the two haves aligned for the balancing drill holes! Though I feel it does matter how they go back together, the manual mentions nothing about it on the dis-assembly or re-assembly. Please help! I need to know if it matters and how to figure out correct orientation.

 

[skidder58]

I just did the same exact thing. I did look for punch marks and found nothing. I know the drive sheave punch marks must be aligned but found nothing for the driven sheave. I'm assuming the drive sheave must be aligned for proper balance because you can do some serious damage to an out of balance crankshaft on any motor. I think the halves on the driven sheave are balanced to zero separately so it should not matter as it doesn't have to complete the balance of the engines rotating assembly. Not positive on this but it sounds logical. Have been an auto mechanic for years but this is my first bobcat. Maybe someone with more experience can give us both some insight.

 

[6brnorma]

I just did the same exact thing. I did look for punch marks and found nothing. I know the drive sheave punch marks must be aligned but found nothing for the driven sheave. I'm assuming the drive sheave must be aligned for proper balance because you can do some serious damage to an out of balance crankshaft on any motor. I think the halves on the driven sheave are balanced to zero separately so it should not matter as it doesn't have to complete the balance of the engines rotating assembly. Not positive on this but it sounds logical. Have been an auto mechanic for years but this is my first bobcat. Maybe someone with more experience can give us both some insight.

The variable speed sheaves (mounted on the crankshaft) are a balanced pair…….the driven sheaves (on the jackshaft with the spring) are not. Any orientation is fine.