Motor humming but going nowhere.

brin · Post by **brin** » Wed Apr 10, 2013 6:51 pm

I'm beginning to think there must be something wrong with the belt. I read and followed the suggestions posted here and everything went just fine. I put the belt back on without any problem and got it turned about a half turn and it hung up again. When I use the sanding disk to turn the shaft the inner shaft turns but after some resistance the gilmer shaft remains stationary as the inner shaft turns within it. I am a bit daunted at the prospect of pulling the pullys out to replace the belt but right now that seems to be where I'm at. Also: The speed control now turns completely through and past full cycle and just keeps on turning. The gears and everything look just fine. Sorry to be a pain with my woes but I'm starting to get a bit nervous.

JPG · Post by **JPG** » Wed Apr 10, 2013 8:28 pm

brin wrote:I'm beginning to think there must be something wrong with the belt. I read and followed the suggestions posted here and everything went just fine. I put the belt back on without any problem and got it turned about a half turn and it hung up again. When I use the sanding disk to turn the shaft the inner shaft turns but after some resistance the gilmer shaft remains stationary as the inner shaft turns within it. I am a bit daunted at the prospect of pulling the pullys out to replace the belt but right now that seems to be where I'm at. Also: The speed control now turns completely through and past full cycle and just keeps on turning. The gears and everything look just fine. Sorry to be a pain with my woes but I'm starting to get a bit nervous.

I think it be pix time!

The pulleys do not need to be 'pulled' to replace the belt.

I am thinking the belt was not fully cleared.

I am a bit confused re just keeps on turning.

I think some things are not positioned correctly to each other.

Do not despair, we have overcome 'situations' far more dire appearing than this;).

You are not being a 'pain'!:)

I think one 'problem' at a time.

Step one: PIX!!!! - belt in idler pulley - quadrant gear against control sheave button*.

* This may be the 'kicker'! IF the button/bearing are 'missing', the control sheave can open too far allowing the belt to drop down too far. Then there may be 'issues' with the quadrant gear(etc.) itself.

brin · Post by **brin** » Wed Apr 10, 2013 11:29 pm

Okay - thanks for hanging in there with me on this. The wife is the picture taker and so that will be tomorrow's project and we will try and get them off to you. Thanks again. Bart

letterk · Post by **letterk** » Wed Apr 10, 2013 11:30 pm

JPG40504 wrote: Step one: PIX!!!! - belt in idler pulley - quadrant gear against control sheave button*.

* This may be the 'kicker'! IF the button/bearing are 'missing', the control sheave can open too far allowing the belt to drop down too far. Then there may be 'issues' with the quadrant gear(etc.) itself.

I was hoping someone would mention that. I just picked up a project machine for very little that hums and had lost the clip on the button bearing. As soon as I freed the belt the motor turned with no issues. I was wondering if the clip lets go the belt can drop too low and lock up in the sheaves.

JPG · Post by **JPG** » Thu Apr 11, 2013 12:53 am

The clip is there for one reason only - to prevent the button from rotating thus allowing the button to slide on the quadrant with minimum wear. Since the control sheave rotates, a bearing is needed.

Assuming a 'normal' size belt the belt can drop down too far in the idler pulley under the following 'abnormal' conditions.

The idler shaft(and therefore the idler sheave) is too far towards the belt cover direction.

The control sheave is too far towards the quadrant(missing button etc.).

The SS has been moved while not running and the belt has dropped to a jam position which is possible at fast speed settings.

The floating sheave on the motor pulley is sluggish responding to the opening of the idler pulley(control sheave) causing the belt to go slack.

There may be others.

joshh · Post by **joshh** » Thu Apr 11, 2013 5:11 pm

JPG40504 wrote:* This may be the 'kicker'! IF the button/bearing are 'missing', the control sheave can open too far allowing the belt to drop down too far. Then there may be 'issues' with the quadrant gear(etc.) itself.

Here is a picture if the way the clip should look
[ATTACH]20958[/ATTACH]

brin · Post by **brin** » Fri Apr 12, 2013 1:12 pm

I studied the picture you sent and it looks pretty much like mine except a tad bit cleaner. One thing which may make a difference on mine: The worm gear seems to have traveled past the gear teeth on the lamb chop(?) I don't know if this is leaving the machine stuck in the full high speed or low speed mode. When I try to turn it by rotating the sanding disc the inner shaft turns inside of the outer shaft which would rotate the gilmer drive if it turned. While doing this I rotated the speed control. I know your not supposed to do this but I wanted to see what happened inside when you did and nothing inside the machine moved.

joshh · Post by **joshh** » Fri Apr 12, 2013 2:39 pm

brin wrote:The worm gear seems to have traveled past the gear teeth on the lamb chop

I think we found the problem. Unhook the clip and turn the speed control to slow. After it is set to slow, turn the speed dial toward fast WHILE putting pressure on the top of the porkchop and push toward the base of the worm gear. As you turn the speed control toward fast, it should thread in. After it is threaded in and the dial is set to fast, reinstall the clip and belt, and do a high speed adjustment.

See this video for normal operation: http://m.youtube.com/#/watch?v=2jH2umzB ... jH2umzB02g

joshh · Post by **joshh** » Fri Apr 12, 2013 2:55 pm

Also, does anyone have any ideas as to why it came off to begin with? Was it simply turned past slow?

JPG · Post by **JPG** » Fri Apr 12, 2013 4:41 pm

joshh wrote:Also, does anyone have any ideas as to why it came off to begin with? Was it simply turned past slow?

Perhaps.

I believe there are two problems.

The Gilmer clutch is either slipping or limiting torque.

The speed control is off the gear.

These need to be addressed one at a time.

Pull the speed control and lets get it correct first.

While it is out lets check out the pulleys/shafts/clutches etc.

Then if all works properly, reassemble.