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Author Topic: LT-40 alternator belt question  (Read 822 times)

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Offline Dan_Shade

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LT-40 alternator belt question
« on: September 03, 2023, 09:47:00 AM »
Is the alternator belt supposed to be on the first pulley groove nearest the engine?  

Do you have to remove the drive belt to replace the alternator belt? 


Woodmizer LT40HDG25 / Stihl 066 alaskan
lots of dull bands and chains

There's a fine line between turning firewood into beautiful things and beautiful things into firewood.

Offline Dan_Shade

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Re: LT-40 alternator belt question
« Reply #1 on: September 03, 2023, 11:04:06 AM »
I found it in my engine manual. 



 
Woodmizer LT40HDG25 / Stihl 066 alaskan
lots of dull bands and chains

There's a fine line between turning firewood into beautiful things and beautiful things into firewood.

Offline barbender

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Re: LT-40 alternator belt question
« Reply #2 on: September 06, 2023, 12:21:14 AM »
I've been able to snake the alternator belt under my drive belt iirc, but my alternator uses one of the flat multi-v belts. It looks like a serpentine belt but it's approximately the same length as yours.
Too many irons in the fire

Offline Crossroads

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Re: LT-40 alternator belt question
« Reply #3 on: September 06, 2023, 10:25:30 PM »
With the clutch disengaged, you should be able to slip the drive belt off, so you can install the A-33 alternator belt. 
With the right fulcrum and enough leverage, you can move the world!

2017 LT40 wide, BMS250 and BMT250,036 stihl, 2001 Dodge 3500 5.9 Cummins, l8000 Ford dump truck, hr16 Terex excavator, Valley je 2x24 edger, Gehl ctl65 skid steer, JD350c dozer

Offline Magicman

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Re: LT-40 alternator belt question
« Reply #4 on: September 07, 2023, 08:16:05 AM »
Engage the clutch, loosen or let the brake drop down, disengage the clutch, and you will have plenty of room. 

Knothole Sawmill, LLC     '98 Wood-Mizer LT40SuperHydraulic   WM Million BF Club Member   WM Pro Sawyer Network

Never allow your "need" to make money to exceed your "desire" to provide quality service.....The Magicman

Offline Dan_Shade

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Re: LT-40 alternator belt question
« Reply #5 on: September 08, 2023, 09:57:44 AM »
I'm always looking for the shortcut....

I didn't want to have to adjust the brake.

But it was time to adjust the belt tension anyway, so I loosened it up.

My mill eats way too many alternator belts.
Woodmizer LT40HDG25 / Stihl 066 alaskan
lots of dull bands and chains

There's a fine line between turning firewood into beautiful things and beautiful things into firewood.

Offline Jim_Rogers

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Re: LT-40 alternator belt question
« Reply #6 on: September 08, 2023, 06:41:07 PM »
Are the pulleys aligned?

Jim Rogers
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Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Offline Dan_Shade

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Re: LT-40 alternator belt question
« Reply #7 on: September 08, 2023, 06:43:17 PM »
Nothing seems bent or out of alignment. 

I'm not sure how to check it or to what tolerance. 
Woodmizer LT40HDG25 / Stihl 066 alaskan
lots of dull bands and chains

There's a fine line between turning firewood into beautiful things and beautiful things into firewood.

Offline ladylake

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Re: LT-40 alternator belt question
« Reply #8 on: September 09, 2023, 03:36:05 AM »
I'm always looking for the shortcut....

I didn't want to have to adjust the brake.

But it was time to adjust the belt tension anyway, so I loosened it up.

My mill eats way too many alternator belts.
    
 Are your pulleys wore out  .  Steve
Timberking B20 15000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Offline Dan_Shade

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Re: LT-40 alternator belt question
« Reply #9 on: September 09, 2023, 06:39:26 AM »
What are the indicators of a worn out pulley? 

The mill has about 1200 hours on it. 
Woodmizer LT40HDG25 / Stihl 066 alaskan
lots of dull bands and chains

There's a fine line between turning firewood into beautiful things and beautiful things into firewood.

Offline ladylake

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Re: LT-40 alternator belt question
« Reply #10 on: September 09, 2023, 07:19:31 AM »

 They shouldn't be wore out yet but could be if they were slipping a lot .  They should grip the side of the belt good and not bottom out in the pulley..  Steve
Timberking B20 15000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Offline richhiway

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Re: LT-40 alternator belt question
« Reply #11 on: September 09, 2023, 08:14:04 AM »
Check the amps it is putting out. If you have a bad battery or something is pulling too big a load it will wear out the belt. 
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Offline Gary Davis

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Re: LT-40 alternator belt question
« Reply #12 on: September 20, 2023, 01:25:51 PM »
mine eats belts also I pull the drive belt of to replace it

Offline Chuck White

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Re: LT-40 alternator belt question
« Reply #13 on: September 20, 2023, 01:31:55 PM »
It seems as though, if the alternator belt gets torn up so often that the alternator pulley is not in complete alignment with the drive pulley! 
~Chuck~
Retired USAF 1989, Retired School Bus Driver 2012, Retired Mobile Sawyer 2022, 2018 Silverado 4X4,  2019 Subaru Forester.  Cooks Cat Claw Sharpener and single-tooth setter
Basic mechanical skills are all that's required to maintain a Wood-Mizer

Offline Magicman

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Re: LT-40 alternator belt question
« Reply #14 on: September 20, 2023, 02:04:49 PM »
I run years without replacing nor have an alternator belt failure.  I carry a spare but in 20+ years sawing, I have only had one failure while sawing.
Knothole Sawmill, LLC     '98 Wood-Mizer LT40SuperHydraulic   WM Million BF Club Member   WM Pro Sawyer Network

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Offline Chuck White

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Re: LT-40 alternator belt question
« Reply #15 on: September 21, 2023, 08:36:26 AM »
You've ran the mill longer than I did Lynn!

While I had my mill, I cut just about 875,000 bf of lumber, and in that time, I replaced the alternator belt once!
~Chuck~
Retired USAF 1989, Retired School Bus Driver 2012, Retired Mobile Sawyer 2022, 2018 Silverado 4X4,  2019 Subaru Forester.  Cooks Cat Claw Sharpener and single-tooth setter
Basic mechanical skills are all that's required to maintain a Wood-Mizer

Offline Bindian

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Re: LT-40 alternator belt question
« Reply #16 on: September 24, 2023, 12:33:18 AM »
If you are eating alternator belts, the drive belt pulleys (sheaves) are not correctly aligned..  The alternator belt pulley mandates where all the other pulleys go.  So you have to align it, then align the pulleys (& split sleeve bushings) for drive belt.  I had to reach a compromise between the upper and lower drive belt pulleys not quite aligned.  About 1/16th out. I went all thru that when I had to change the stub shaft on back of my Yanmar.  Contact Dennis at WN Tech Support.   Dennis told me how to use a string to check alignment.   He helped me through all the R&R, torques, and Alignment issues.  Photo show pink string as a straight edge to align.

 
        hugs,  Brandi
Mahindra 6520 4WD with loader/backhoe and a Caterpiller E70 Excavator.  My mill is a Woodmizer LT40HD Wide 35hp Yanmar Diesel. An old Lull 644D-34 called Bull

My Hero is Johnny Jett


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