Leveling throat on L/M
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=155236
Printed Date: 26 Aug 2025 at 12:35am
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Topic: Leveling throat on L/M
Posted By: OhKen
Subject: Leveling throat on L/M
Date Posted: 01 Nov 2018 at 7:23pm
| Have owned several Gleaners and have never had this issue . But the M2 we have now has a throat that is unlevel . So much so that previous owners ran with one of the tires underinflated which has led to a weakened sidewall . What is the best way and how do you level the head ? Which side is easiest to move ? |
Replies:
Posted By: JoeO(CMO)
Date Posted: 01 Nov 2018 at 8:49pm
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Dad had an E and I recall helping him do the adjustment, -an eccentric on the cylinder bearing, I think on the side and lined up the header with the axle tube. I think only one adjustment side. I don't know what the M2 has for adjustments.
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Posted By: tbran
Date Posted: 01 Nov 2018 at 9:12pm
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there are eccentrics on the pivot but I would bet the bushings 71169940 I think, is out. This is where the studs on the throat pivot. Usually this can be determined if the head is raised all the way - one side will move more than the other at the throat. Sometimes this requires machining to repair or a special bushing...check it out. ------------- When told "it's not the money,it's the principle", remember, it's always the money.. |
Posted By: AC7060IL
Date Posted: 01 Nov 2018 at 10:01pm
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On occasion, I have witnessed where someone may have rebuilt a throat lift cylinder ram(replace seal kit) & did not re-pin the cylinder ram into the correct throat hole. K2's throat has two position holes for lift rams. So, a quick visual under the throat can confirm if this may be your issue?? I don't know if Ms have two positions? Just check it out. Or, you can try either side's eccentric to compensate for unlevel throat. But like Tbran says, a bushing in the throat's pivot housing may be worn too. To get to the bushing though, you got to remove the whole throat. So - After removing all the pivot shaft's belts, sheaves, bearings, electric tattletail sensor wires, unhook/drop lift rams, remove the 8 eccentric mounting bolts (4 on each side), and disengage the return grain shoot, I used a forklift to lift the whole throat assembly, along with it's eccentrics & pivot shaft, and back it away from combine. If you can reach penetrating fluid onto the exposed threads of each of the 4 eccentric mounting bolts, it may help them from snapping off?? The lower rear bolts are the worst. I snapped off one of these on the right side. No worries though. Cause after you remove the throat from combine, you can get in there with a good long nose vise grip and turn the threaded end inward to remove the snapped bolt. Once the throat is out in the open, you can remove eccentrics & shaft to inspect bushins in the throat's pivot housing. Check each side's bushing (one of each side - 2 total). If theres any shaft play, replace the bushing(s). After you reinstall new bushing(s), slid in pivot shaft & eccentrics onto shaft. Then forklift the whole throat back into combine. Each eccentric has 4 positions (clockwise:top,rear,bottom,&forward). When you reinstall the throat into combine, make sure pivot eccentrics are 180 degrees opposing each other (one side positioned down, one side positioned up). Then if the throat requires levelling, you can try adjusting from one side only.   |
Posted By: OhKen
Date Posted: 01 Nov 2018 at 10:05pm
| Tbran you have lost me ! I don't have a parts catalogue to see what you are talking about . Is the pivot shaft or point fixed to the throat of is it removable so that I can machine it ? If and how do I tell which side is wore ? Or do I just put shims in the lift pockets on the throat and call it good ? |
Posted By: MACK
Date Posted: 01 Nov 2018 at 10:05pm
| Agree with tbran. They are known for wearing bushing and stub. MACK |
Posted By: OhKen
Date Posted: 01 Nov 2018 at 10:39pm
| AC7060IL Thank you that makes sense now ! Mother Nature says , you have time to fix that ! uuurrrgghhh! |
Posted By: SteveM C/IL
Date Posted: 01 Nov 2018 at 10:51pm
| Those grease zerks get missed alot. |
Posted By: AC7060IL
Date Posted: 01 Nov 2018 at 11:15pm
You are welcome. The pivot shaft is stationary inside the combine eccentrics. The throat pivots on this shaft. On the K2, it's right side eccentric was roll-pinned onto the shaft. The left side eccentric just slid on shaft & freely floats on it. Well, I say it floats? There's a snap ring on the left side between floating eccentric & belt sheaves. During this job, it's a good idea to clean out all Sheave bearings, repack them with new grease & tap in new bearing seals. Pay special attention to the shims inside the right side's variable speed sprocket (the bicycle chain driven sprocket that you rotate from the cab's side console to change cylinder speeds).
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OhKen wrote:Posted By: AC7060IL
Date Posted: 01 Nov 2018 at 11:17pm
Yes, they should be greased daily.
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Posted By: MACK
Date Posted: 02 Nov 2018 at 10:42pm
| Replace bolts that hold caps to side of machine with grade 5 bolts. MACK |