JD 336 Baler shears pins on shut down

Jim Thode

New User
My JD 336 baler works fine when running and very seldom shears a pin under load. However about 1/2 the time the flywheel pin shears when I disengage the tractor PTO clutch when shutting down the baler at the end of a job. It does not seem to make any difference if I disengage the PTO at speed of idle down slowly the disengage the clutch. Any ideas what causes this problem?

Thanks for any help.
Jim
 
Does the over running clutch work? You should be able to turn the baler flywheel in the normal direction and the pto to the tractor NOT turn.

Some older tractors have a severe PTO brake and if over running clutch is not working on baler it might cause this problem.
 
The ratchet on the baler slip clutch seems to work fine and I can hear the dogs clicking when it shuts down correctly. The tractor is a 995 Case and the PTO turns free when disengaged.
Jim
 
I wonder how loose the flywheel is on the hub? The Deere's are strange like that. It may be that the hub is getting worn, the shear bolt has to carry some of the weight... and when the load changes it just breaks the bolt.

Rod
 
(quoted from post at 11:44:12 07/15/14) I wonder how loose the flywheel is on the hub? The Deere's are strange like that. It may be that the hub is getting worn, the shear bolt has to carry some of the weight... and when the load changes it just breaks the bolt.

Rod

I've seen many JD sq balers with severely worn flywheel bushings that never sheared flywheel bolt on pto shut down if needle frame was in home position & PH stop was adjusted correctly.
 
Rod,
Yes the flywheel is a little loose. I think I saw some placed that shims at the hub of the flywheel can be added, taken out or repositioned to tighten up the flywheel. Sounds like a good winter project.

Jim
 
(quoted from post at 12:14:38 07/15/14) Rod,
Yes the flywheel is a little loose. I think I saw some placed that shims at the hub of the flywheel can be added, taken out or repositioned to tighten up the flywheel. Sounds like a good winter project.

Jim

Bushing a "little loose" and shearing FW shear bolt at shutdown are two different symptoms.
JD offered no shims for flywheel only a new bushing(parts key 5)
BP14006 Bushing - BEARING, FLYWHEEL ADD 26.99 USD
mvphoto9146.gif
 
It could also be Part #6, the bushing that the shear bolt goes through in the flywheel. We had that problem with our 14T; when we replaced the bushing, the problem went away.
 
(quoted from post at 14:00:31 07/15/14) It could also be Part #6, the bushing that the shear bolt goes through in the flywheel. We had that problem with our 14T; when we replaced the bushing, the problem went away.

Also hole in arm(parts key 10) where shear bolt fits can get worn also.
 
Are you making sure the feed auger is empty when you shut it down? On mine the spring on the hay dogs is getting loose and I will have problems if I get in a hurry and shut it down while there is still hay going through it.
 
When you turn the flywheel through a complete cycle of the plunger, from the front of the baler to the back, does it stick or get tight anywhere along that travel.
 
I believe I can turn the flywheel without the PTO turning but I will double check.

I baled 600 bales today without a problem and it shut down without shearing the pin. It only shears a pin about half the time.

Jim
 
If you look at this video:
https://www.youtube.com/watch?v=MYwfWbT3W7w
The "Balerman" indicates the the looseness in the flywheel is usually not the bushing but can be corrected by removing shims. At least it sounds like he knows what he is talking about,

Jim
 
(quoted from post at 01:22:58 07/16/14) If
The "Balerman" indicates the the looseness in the flywheel is usually not the bushing but can be corrected by removing shims. At least it sounds like he knows what he is talking about,Jim

There are "NO SHIMS" for flywheel available from JD for any model that I looked in the parts catalog including your 336 or a new 348 or older 224. The 'balerman" made another mistake in his video calling springs on the side "PH stop springs" when in fact these springs are associated with the ""trip arm/measuring wheel mechanism"". PH stop spring is up front by PH crank arm.
 
Yes, the auger is empty. Maybe an option would be to back off the bale compression springs before shutting it down.
Jim
 
Are you using John Deere shear pins with the shoulder that fits the flywheel recess? they outlast bolts by a country mile. Shutting down with hay in the chamber can shear pins when the plunger strikes. I once was shearing pins left and right at idle or shut down and found my slip clutch discs wore out, the pin shearing stopped after changing the discs.
 
Yes, using JD pin. My slip clutch is good and set at 375 ft-lbs. The book says 375 to 500 ft-lbs and the lower side seems to save on u-joints.
Jim
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top