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Author Topic: Drive belt tension. 2018 LT 40. 300HRS  (Read 828 times)

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Offline Lawg Dawg

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Drive belt tension. 2018 LT 40. 300HRS
« on: October 10, 2018, 10:01:58 AM »
I've been sawing Poplar and getting some nasty looking cuts with reverb...not wavy just the chatter.  New reshape blades from Albemarle...it's raining steady here now so I trying to track down the problem. Should I have this much play in my drive belt when it's out of gear? Also looks like I've run out of adjustment. Any advice is well appreciated! Dawg



 



 

Or maybe I'm tightening the wrong way



 

2018  LT 40 Wide 999cc
John Deere 4000, Husky 268, 394xp, Shindiawa 591, 2 Railroad jacks, and a comealong.  100 acres of mostly trees!

True South Sawmill Lumber,  located  approximately 45 miles south of Charlotte, NC

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Offline pineywoods

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #1 on: October 10, 2018, 10:06:08 AM »
Slipping drive belt. Lengthen the vertical link about 1/4 inch and try that.
1995 Wood Mizer LT 40, Liquid cooled kawasaki,homebuilt hydraulics. Homebuilt solar dry kiln.  Woodmaster 718 planner, Kubota M4700 with homemade forks and winch, stihl  028, 029, Ms390
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Offline Ben Cut-wright

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #2 on: October 10, 2018, 10:44:10 AM »
I've been sawing Poplar and getting some nasty looking cuts with reverb...not wavy just the chatter.  New reshape blades from Albemarle...it's raining steady here now so I trying to track down the problem. Should I have this much play in my drive belt when it's out of gear? Also looks like I've run out of adjustment. Any advice is well appreciated! Dawg

Or maybe I'm tightening the wrong way.
 
The drive belt is supposed to be loose when "out of gear", not tensioned.  It is not supposed to be adjusted or checked for proper tension while "out of gear".   Engage the blade, engine off, and use the belt tension tool or similar belt tension test tool.  Instructions in the owners manual. 

Your photo shows the turnbuckle has been turned the wrong way, possibly to the extreme loose position.

Offline barbender

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #3 on: October 10, 2018, 11:03:49 AM »
Get the drive belt tension guage from WM and adjust it according to the manual. The drive belt tension is a critical adjustment and you don't want to do it by guessing, you can bust your engine crankshaft👎
Too many irons in the fire

Offline MartyParsons

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #4 on: October 10, 2018, 06:51:35 PM »
Hello,
  This picture below is the correct location when the drive belt is loose and the brake band is engaged on the brake drum.
To tighten the drive belt tension. Engage the drive belt using the auto clutch. Using the belt tension tool that you would have in your binder with your owners manual. Check the tension of the drive belt as described in the auto clutch manual. If the tension is not correct. The nut on the top  horizontal loosen and turn the long aluminum part away from the nut. When you disengage the clutch the distance between the collar at the bottom will decrease. Recheck the belt tension with the belt engaged then tighten the nut.

Hope this helps.
Marty

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Offline YellowHammer

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #5 on: October 10, 2018, 09:49:16 PM »
I second what Barbender says, get a WM drive belt tension gauge.  The mill is pretty sensitive to it.  Too loose, poor cuts.  Too tight, engine breaks.
HobbyHardwoodAlabama.com

Offline Jjoness4

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #6 on: October 10, 2018, 10:35:11 PM »
Chatter in the cut can also be due to cutting too slow, particularly at the entrance to the cut.
2017 LT40HDD35 , Kubota 4701, Ford 3000, Stihl Farmboss

Offline SawyerTed

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #7 on: October 11, 2018, 08:37:13 AM »
Chatter can also be caused by bad bearings in the roller guides. 
Woodmizer LT35HD25, Kubota MX5100, IH McCormick Farmall 140, Granberg Alaskan Chainsaw Mill, Husqvarna 372XP, Husqvarna 455 Rancher

Offline Lawg Dawg

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #8 on: October 11, 2018, 09:30:04 AM »
Ok, it's raining so I'm working on my chatter in poplar problem...wasn't doing this in pine or oak...

I got 22lbs. at 7/16" deflection



 



 

I installed a BRAND NEW 10 degree, I know this blade should cut poplar smooth as glass, but this is my result  :(



 

Any more suggestions would be greatly appreciated!
2018  LT 40 Wide 999cc
John Deere 4000, Husky 268, 394xp, Shindiawa 591, 2 Railroad jacks, and a comealong.  100 acres of mostly trees!

True South Sawmill Lumber,  located  approximately 45 miles south of Charlotte, NC

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Offline Smithkp

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #9 on: October 11, 2018, 09:58:04 AM »
I got something pretty close to that using the turbo blades and went back to 10 degree double hards and it went away.

 
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Offline Crossroads

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #10 on: October 11, 2018, 10:03:01 AM »
This is really grasping for straws, but it the blade level with the bunks? Could the front of the blade being low cause that? I hope you find the cause and get it resolved 
2017 LT40 wide, Kubota l185dt, 2-036 stihl, 2001 Dodge 3500 5.9 Cummins

Offline terrifictimbersllc

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #11 on: October 11, 2018, 10:11:47 AM »
My guess, I cant see everything in the photos and the last 2 posts may be showing different things, but.....

If the marks are parallel to the blade, then the blade has a set issue with one or more teeth, or, 

if the marks are diagonal relative to the blade, it is probably the very common band harmonic that often happens at the beginning of a cut and goes away further down the board.  If the harmonic thing it will change dramatically or go away if you cut at a different speed, most likely faster. 
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Offline Magicman

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #12 on: October 11, 2018, 10:21:18 AM »
Verify your engine RPM's when sawing, vary your blade tension, (higher/less) or flat spot on blade guide or bad guide bearing.  Is the idle side of the head shaking/vibrating while sawing?
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Offline Lawg Dawg

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #13 on: October 11, 2018, 12:27:20 PM »
After talking to Marty on the phone this morning I think I figured out my main problem...too slow feed rate...plus he gave me a nice little tip to tap the blade tracking bolt head on the idle side with a rubber hammer and that would drop the tension about 300 or 500 lbs. sure enough it did, so tourqed it on down good. The drive belt was too loose, tightened that up, then run it right against the governor, like riding a wave!  Results 100 times better! I can live with this!



 

But I think my manual is for a different style turnbuckle..when I turn mine counterclockwise it loosens the drive belt. Plus I have an adjustable collar with a set screw on the turnbuckle. It doesn't show that in my manual.





Thanks everyone! I don't know what I'd do without Forestry Forum, probably be on a roof somewhere putting on shingles!  :D
2018  LT 40 Wide 999cc
John Deere 4000, Husky 268, 394xp, Shindiawa 591, 2 Railroad jacks, and a comealong.  100 acres of mostly trees!

True South Sawmill Lumber,  located  approximately 45 miles south of Charlotte, NC

100,000 bf club member
Pro Sawyer Network

Online Dave Shepard

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #14 on: October 11, 2018, 03:05:10 PM »
What does your mill call for for tension? My Super is 18 pounds at 7/16". As soon as I saw that washboard photo I suspected slow feed rate. 

I like that hole in the guard for the gauge. I know what I'm doing to my guard soon. 8)
Wood-Mizer LT40HDD51-WR Wireless, Kubota L48, Honda Rincon 650, TJ208 G-S, and a 60"Logrite!

Offline terrifictimbersllc

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #15 on: October 11, 2018, 04:27:40 PM »
I like that hole in the guard for the gauge. I know what I'm doing to my guard soon.
Me too there's going to be one there on my mill shortly.
DJ Hoover, Terrific Timbers LLC,  Mystic CT   2001 WM LT40SHDD (42HP Kubota, Accuset2, FAO's, Lubemizer, debarker, hydraulics everywhere), Peterson WPF 10-30 with chain slabber. Logrite fetching arch, WM BMS250 sharpener/BMT250 setter.

Offline John S

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #16 on: October 11, 2018, 06:18:01 PM »
I don't think the diagram you show is for AutoClutch, it looks like the manual version.  Which do you have?
2018 LT40HDG38 Wide

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #17 on: October 11, 2018, 06:43:11 PM »
I believe that here were several of us that noticed that hole.  :o

Yes, wrong diagram.  ;)
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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #18 on: October 11, 2018, 07:17:32 PM »
>>> I think I figured out my main problem...too slow feed rate...plus he gave me a nice little tip to tap the blade tracking bolt head on the idle side with a rubber hammer and that would drop the tension about 300 or 500 lbs. sure enough it did, so tourqed it on down good. The drive belt was too loose, tightened that up, then run it right against the governor, like riding a wave! <<< 

But, Did you actually figure it out? 
You changed 3 things there. 
- Was it feed rate? 
- or the tracking bolt head? 

- or was it the drive belt? 

Timber Harvester 30HT26 (setworks, hydraulic) Stihl 880 (36" bar).

Offline MartyParsons

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Re: Drive belt tension. 2018 LT 40. 300HRS
« Reply #19 on: October 11, 2018, 08:01:26 PM »
The drive belt adjustment is in the auto clutch manual. It is confusing, but you will need to look in that manual to get the correct information. The operators manual for the sawmill is different than the Auto clutch manual.


Glad things worked out.

Feed rate is how fast the saw head moves through the cut. You should saw as fast as the blade will cut and the band speed should not change ( don't bog the engine) but be within 50 rpm or less than max load RPM. :o It will not feel comfortable at first.

Marty 
A pessimist sees difficulty in every opportunity; an optimist sees opportunity in every difficulty. -Winston Churchill


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