Screeching sound - Advice?

[dave99]

Based on your post Bill, you say the clearance between the sheave and motor housing should be 1/16" - 3/16". Does this mean that you normally set it with a clearance of 1/8"?

[JPG]

Based on your post Bill, you say the clearance between the sheave and motor housing should be 1/16" - 3/16". Does this mean that you normally set it with a clearance of 1/8"?

Methinks the spacer is what should 'set' it. The range being too small is an indicator of either the spacer wearing or burying itself into the softer sheave. The range being too large suggests it is not against the spacer and only the set screw is holding it out. JMHO

[billmayo]

Methinks the spacer is what should 'set' it. The range being too small is an indicator of either the spacer wearing or burying itself into the softer sheave. The range being too large suggests it is not against the spacer and only the set screw is holding it out. JMHO

JPG is right on. I find the motor backing plate may have been pryed on and bent along with the fan sheave which can also be bent. This can give you the min 1/16" to 3/16" clearance on the same motor so I only worry about the minimum clearance. I will remove and straighten the motor backing plate but discard any bent fan sheave.

[dave99]

Went ahead and pulled the spring and outer lower drive sheave. I wasn't sure how the inner part of the sheave went on (or off) so cleaned and lubed the shaft and sheave and left it in place. Not very dirty, no rust, and the moving sheave would move freely. Didn't remove the motor to do this and getting the snap ring off the shaft was harder than putting it back together.

Looks like the clearance between the inner motor sheave and the motor plate is about 0.080". Not quite the 1/8" but still isn't making contact in any way. No fines or metal dust that would suggest contact either. Also went ahead and really cleaned the sheave surfaces while I had the drive belt off.

The motor is noisy when turned by hand but when running at speed (uncoupled) sounded ok.

Went ahead and tightened the poly-v belt slightly with the eccentric intermediate shaft. Doesn't seem to have made much difference. It might sound better at high speed and the harmonics don't appear to be as pronounced as before. But the squeal is still very pronounced at low speed.

I am going to go ahead and replace the motor bearings and probably the bearings on the intermediate shaft. Looks like that should be fairly straightforward. Anybody recommend a website for bearing purchase and brand that is current? I tried some of the references I found on this forum (Bob Hill) but didn't seem like I could find him. It appears that irvineman and jjdini3 may still be in business though.

Sounds like I'll take a break on the SS while I look for bearings and I am also getting ready to move within the next month so this works out ok so I have a little time to plan. I appreciate all the help.

Dave

[JPG]

Went ahead and pulled the spring and outer lower drive sheave. I wasn't sure how the inner part of the sheave went on (or off) so cleaned and lubed the shaft and sheave and left it in place. Not very dirty, no rust, and the moving sheave would move freely. Didn't remove the motor to do this and getting the snap ring off the shaft was harder than putting it back together.

Looks like the clearance between the inner motor sheave and the motor plate is about 0.080". Not quite the 1/8" but still isn't making contact in any way. No fines or metal dust that would suggest contact either. Also went ahead and really cleaned the sheave surfaces while I had the drive belt off.

The motor is noisy when turned by hand but when running at speed (uncoupled) sounded ok.

Went ahead and tightened the poly-v belt slightly with the eccentric intermediate shaft. Doesn't seem to have made much difference. It might sound better at high speed and the harmonics don't appear to be as pronounced as before. But the squeal is still very pronounced at low speed.

I am going to go ahead and replace the motor bearings and probably the bearings on the intermediate shaft. Looks like that should be fairly straightforward. Anybody recommend a website for bearing purchase and brand that is current? I tried some of the references I found on this forum (Bob Hill) but didn't seem like I could find him. It appears that irvineman and jjdini3 may still be in business though.

Sounds like I'll take a break on the SS while I look for bearings and I am also getting ready to move within the next month so this works out ok so I have a little time to plan. I appreciate all the help.

Dave

PM me re motor bearings - need to know which brand motor.