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dann 
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Joined: 10 Feb 2015
Location: WI 53520
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 Topic: Allis 919 Hydro deck belt routing
Posted: 03 Oct 2022 at 6:14pm |
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looking for a diagram for correct belt routing from PTO pully to mower deck (48 inch) on an Allis 919 Hydro lawn tractor. Have had an issue with the 4L 78 belt coming off when mowing tall grass. The old decal on the mower deck is missing. Thanks for any help available.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 03 Oct 2022 at 9:37pm |
mower deck belt ? ............ does this help any ? .... not too many Internet choices
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
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Posted: 03 Oct 2022 at 9:45pm |
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Are you mowing that tall grass with the deck up high or at normal height?
Steves diagram is correct. Make sure your spring at the idler pulley is in good shape with good tension.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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steve(ill)
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Posted: 03 Oct 2022 at 9:45pm |
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Like them all, but love the "B"s.
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dann
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Posted: 04 Oct 2022 at 7:19am |
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Deck belt is not a problem. The belt from the PTO pully to the mower deck is the one coming off.
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steve(ill)
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Posted: 04 Oct 2022 at 7:37pm |
the drive belt ? Dont see how you could put it on wrong... Belts that have a directional turn in them can get a TWIST and cause them to JUMP under load.. i have a WOODS mower that has that problem ever few years.
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Like them all, but love the "B"s.
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AC720Man
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Posted: 04 Oct 2022 at 8:23pm |
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PTO belt will jump off for a few reasons. If I run my deck up high it will at times throw the belt in tall thick grass due to the added stress on the belt because of pulley alignment of the deck to the idler pulley. I have also had the bolt holding down the belt pulley on the deck work loose which allows the pulley to lift throwing the belt out of alignment. Also, if the tension pulley arm gets bent when the belt comes off that can also cause it. I have had that happen to my 917H over the past 35 years which is the same tractor with a 17 hp engine.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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AC720Man
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Posted: 04 Oct 2022 at 8:31pm |
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Assuming you have checked the spring at the rear pulley tension lever to make sure it is giving the belt good tension when the arm is in the tightened position?
I have also switched to Kevlar belts which last longer and don't stretch as bad.
Edited by AC720Man - 04 Oct 2022 at 8:34pm
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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dann
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Location: WI 53520
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Posted: 05 Oct 2022 at 9:33am |
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Thanks for the info on kevlar belts. Tension at drive pully spring looks good. The PTO drive pully has two belt groves. Should the belt that powers the deck be on the inboard grove and the outboard grove be used to power a rear attachment?
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only AC orange
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Posted: 05 Oct 2022 at 11:34am |
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Yes, inboard pulley to mower deck and outboard pulley to tiller or rear attachment. By chance, have you gotten the PTO to mower deck belt reversed making blades turn wrong way?
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acken
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Posted: 05 Oct 2022 at 8:50pm |
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Have you got the flat belt idler in the upper hole of bracket, it should face more towards center of tractor than the bottom hole? Bottom hole is used for snowblower.
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Mikez
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Posted: 05 Oct 2022 at 11:03pm |
Did it ever work. What has led up to this belt coming off.
Post a picture of yours
Edited by Mikez - 06 Oct 2022 at 7:41am
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dann
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Posted: 06 Oct 2022 at 10:23am |
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Blades are turning in correct cutting direction. Will check location of idler mounting to bracket. Have only used this mower to cut lawn three times. Did not have any belt problems until mowing taller grass when belt came off and was damaged by contacting bolt holding deck input pully in place. Thanks for all the replies. I will try a kevlar belt next.
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Mikez
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Posted: 06 Oct 2022 at 9:50pm |
Guess what I meant was have you been using the mower for years and all the sudden when you tried mowing the tall grass the belt came off. We’re you trying to mow with deck raised up.
Or is this a fairly new to you mower.
Just trying to get a background. Weather something wore out or maybe something was put together wrong.
Want to try a simplicity belt 1713515sm
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Steve in NJ
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Posted: 06 Oct 2022 at 10:15pm |
Those Kevlar belts are amazing. I put one on the ZT last Spring. I checked it this Spring before I started mowing and it looked like I'd just installed it! Them things wear like iron. Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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dann
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Posted: 13 Oct 2022 at 10:25am |
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When installing new Kevlar belt noticed that the V-grooved idler below drive pully had moved forward about a half inch. After moving the V-grooved idler rearward away from flat pully idler, tension was increased, and mower worked great.
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