osp belt adjust issues

[kallio]

I just installed the osp adjuster tonight and have some questions. I bought a new 8dn belt and trying to set the deflection, however, whenever I run the sled on the stand the belt sits 1/4 inch below the top. I set the deflection with the belt moved to the top of the clutch just above and once it runs on the stand it isn't returning to the top. Has anyone else had this issue?

 

[kallio]

I should also add that when I set the deflection with the belt at the top I have no free play. once its ran on the stand it has 1/4" of free play

 

[Yamajon1]

I have Thunder Products belt adjuster and if I run it on a stand I have the same issue yet when driving the sled it returns to where I set it. Just wont do it on the stand when there is no load on it. Set it and drive it. This has been brought up by others in the past with adjusters.

 

[rebmo]

Ditto, will not adjust on the stand from my experience. I had to do a short run forward/reverse to get the belt to settle in right to check true deflection. On my Cat, I was so far off I thought there was a problem with the adjuster(kept squealing), but after running it at least a dozen times and adjusting drastically (thinking too much) then I started getting in the ballpark it dialed in fine. My experience with 2 procross sleds is that it's best to run it on a surface to get it dialed in. Forward & some reverse too seemed to work best.

The deflection adjusters are great once you get them figured out and dialed in. Very precise deflection can be achieved without playing with shims.

 

[kallio]

thanks for the quick posts. now when reading the other night I came across someone noting how to check the offset easily. something about 61 mm - but for the life of me I can not find what I read. Does anyone have this link handy?

 

[rebmo]

For measuring deflection, I made a piece of hardwood about 3/4" square that spans the top of the Primary clutch to the top of the secondary clutch atop the belt. Then I made another smaller piece of wood with the deflection distance (61mm might be yours) marked, and I push down the belt perpendicular to the 3/4" piece spanning the top of the clutches and see if the distance the belt deflects matches the mark on the 2nd piece. If too much or too little, I adjust deflection until I can push down on the belt and the mark aligns precisely with the board spanning the clutches. I run the sled on ground a fair amount after each adjustment to ensure the clutches have settled in to the new defection setting. Works perfectly.