1998 Craftsman LT electric clutch - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
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post #1 of 15 Old 04-19-2017, 08:55 PM Thread Starter
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1998 Craftsman LT electric clutch

My early 1998, Green box style tractor, is having mowing issues. It has the 46" 3 blade deck.
I just put on brand new kevlar belts, and new blades. Pulleys are good, spindles are good.
It was fine after the new parts for the first 15 minutes, now the mower deck doesn't come up to rpm's.
So is this the sign of an electric clutch failing, or does it just need to be adjusted, or ???

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post #2 of 15 Old 04-19-2017, 10:52 PM
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Re: 1998 Craftsman LT electric clutch

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It would be mighty coincidental.
Could the deck braking system been "disturbed"?

You could try adjusting the air gap on the electric PTO (if adjustable) if you REALLY think that is the problem.

https://www.google.com/#q=Warner+Clutch+Adjustment.pdf

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post #3 of 15 Old 04-19-2017, 11:42 PM Thread Starter
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Re: 1998 Craftsman LT electric clutch

Bill the tractor number is 917.258685. Clutch is ayp 137140, which is a Warner clutch.
I'm going to check everything on the deck this weekend, but this is a strange problem. I thought if these clutches were out of adjustment they simply didn't work.
The clutch is working but not reaching the correct rpm's. I don't see any signs of belt slippage. Belts are new and the correct ones.



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post #4 of 15 Old 04-20-2017, 04:43 AM
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Re: 1998 Craftsman LT electric clutch

Did you remove the clutch to change belts? Didn't lose the keyway? Any tensioning springs on the deck? I had a 46 inch/electric PTO on a 917.256600 once, had a lot of belt routing. I'm just guessing.
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post #5 of 15 Old 04-20-2017, 05:48 AM Thread Starter
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Re: 1998 Craftsman LT electric clutch

No. I just had to unplug it and remove a couple guides. I took pics of the belt routing to make sure I put it back right.

Guys, one thing I should of mentioned is it had this problem with the old belts, also. I had assumed it was a belt stretch problem.

The belts were worn out and stretched. After I replaced the belts. Everything worked fine for a short time. Then the problem started again.

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post #6 of 15 Old 04-20-2017, 08:13 AM
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Re: 1998 Craftsman LT electric clutch

Check your idler pulley set up on deck. Our latest one did same and idler pulley was froze in place, belt was too loose on PTO.

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post #7 of 15 Old 04-20-2017, 09:55 AM
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Re: 1998 Craftsman LT electric clutch

I agree, the spring and lever on the deck idler pulley could be restrictive in movement not allowing the idler pulley to place the correct tension on the belt.

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post #8 of 15 Old 04-20-2017, 07:03 PM Thread Starter
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Re: 1998 Craftsman LT electric clutch

Idler pulley is fine, but the arm isn't.
Looks like the arm is bent, putting the pulley at an angle. So the belt is to loose because of this.Click image for larger version

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post #9 of 15 Old 04-20-2017, 07:05 PM Thread Starter
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Re: 1998 Craftsman LT electric clutch

I only uploaded the pic once, so I don't know why their are 2 copies showing.
Now it's back to one pic. Must be a glitch.
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post #10 of 15 Old 04-20-2017, 09:08 PM
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Re: 1998 Craftsman LT electric clutch

Figured that might be your issue! In my latest machine at first deck came on soft, turned out the idler was seized. Today after rebuild you can hear it fire right on when pto engaged!

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post #11 of 15 Old 04-21-2017, 09:28 PM
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Re: 1998 Craftsman LT electric clutch

It might be just the bright back gound in the the pic, but it looks like that belt is riding very deep in the pulley. You get the right width on that new belt? If it is bottoming out, it will slip. Just a thought.

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post #12 of 15 Old 04-21-2017, 10:50 PM
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Re: 1998 Craftsman LT electric clutch

I agree, belt doesn't look wide enough, and Idler is canted. Check the Idler bracket bushings, and find the proper belt size.
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post #13 of 15 Old 04-22-2017, 08:54 AM
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Re: 1998 Craftsman LT electric clutch

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Originally Posted by Alien5044 View Post
It might be just the bright back gound in the the pic, but it looks like that belt is riding very deep in the pulley. You get the right width on that new belt? If it is bottoming out, it will slip. Just a thought.
any chance someone put the wrong idler on it?
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post #14 of 15 Old 04-25-2017, 05:20 AM Thread Starter
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Re: 1998 Craftsman LT electric clutch

Sorry guys. I haven't been getting updates on this thread.

The belt is correct, at least by the part number it is. I kept the old belt, so I will check to make sure the width and length is right.

I've had the tractor for over 11 years. It had that idler pulley on it when I bought it. I will double check the condition of the pulley when I pull the deck.
We've just had four plus inches of rain here, so I need the ground to dry out before I can work on it.

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post #15 of 15 Old 04-25-2017, 11:01 AM
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Re: 1998 Craftsman LT electric clutch

I have the understanding, from reading, that v-belts do NOT stretch. They will wear the sides of the Vee, and slip further into the pulley until they are so deep they no longer are in tension, and develop slip and melt and destruction.
The idler in the picture appears to be at an angle. One can remove the idler shaft support arm, and tweak the angle, hopefully straightening the arm so the idler pulley runs square to the backside of the belt. Some width is there in the idler pulley to handle the different positions the belt will attain depending on the height of cut setting. The PTO pulley is fixed relative to the chassis, but the deck is movable. The change is 'handled' by the idler pulleys(two on my two-blade deck) with their expanded pulley width allowing the belt angle to vary a bit without causing the belt to ride out of the pulley.
I'd check that the idler arm should be straightened a bit for proper operation. If the belt seems to be riding against either edge of the idler, an angled shaft caused by a bent arm might be the cause.
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