Baler flywheel shear bolts

[RickB]

Im not understanding. This sounds impossible. The needles go thru the bale chamber very quickly while the ram is backstroked. They must flip back down out of the way to allow the ram an unimpeded forward stroke. For preservation of the needles there is a mechanical safety that sticks up into the bale chamber while the needles are up. This stops the ram dead and shears the bolt. The flywheel continues but the baler is NOT running.

You can observe and trace the motions while turning the baler by hand. When you trigger the knot cycle will delay until ram is on its backstroke. The needles come up while the knot ties and rethread the knotter - then recede quickly as the ram comes back toward the chamber. At running speed, if the ram comes back into the chamber before they are clear they are destroyed. Trace all the drives at hand speed and youll find a loose or sticking or broken part. Then everything will be ok.
larry

Nonsense. The needles travel through slots in the plunger face and cycle when the plunger is rearmost in its stroke. The plunger never touches the needles, and without hay, sticks, or other debris in the chamber, there is no possible way that the plunger can break the needles.

 

[JasG]

Im not understanding. This sounds impossible. The needles go thru the bale chamber very quickly while the ram is backstroked. They must flip back down out of the way to allow the ram an unimpeded forward stroke. For preservation of the needles there is a mechanical safety that sticks up into the bale chamber while the needles are up. This stops the ram dead and shears the bolt. The flywheel continues but the baler is NOT running.

You can observe and trace the motions while turning the baler by hand. When you trigger the knot cycle will delay until ram is on its backstroke. The needles come up while the knot ties and rethread the knotter - then recede quickly as the ram comes back toward the chamber. At running speed, if the ram comes back into the chamber before they are clear they are destroyed. Trace all the drives at hand speed and youll find a loose or sticking or broken part. Then everything will be ok.
larry

Nonsense. The needles travel through slots in the plunger face and cycle when the plunger is rearmost in its stroke. The plunger never touches the needles, and without hay, sticks, or other debris in the chamber, there is no possible way that the plunger can break the needles.

Rick is correct.

I have timed both New Holland and Deere and they are both very similar. The needles begin to stroke and at the point the tips are almost flush with the chamber the plunger should be about 1-2" from them if I remember correctly traveling towards the rear of the baler. As the needles come up through they are running in slots in the face of the plunger. The plunger holds the hay charge in place while the needles are placing the string up into the knotter. At this time the plunger is at it's rear most point holding the hay compressed in the chamber.

I've helped some people who times the baler with the plunger going the other way and it simply doesn't work well. The hay charge presses on the string and needles and it is very hard to get the baler to tie well.

The only thing the safety stop is to prevent is the needles being in the chamber while hay is being stroked in and compressed. In other words if no hay or other object is between the plunger and the needles the needles can be up and should not be hit by anything.

 

[SPYDERLK]

i have a New Holland 326 square baler and today it has broken a lot of bolts the bales are not wet. Im thinking its something else maybe the needles are linked to safety latch needs to be adjusted.? How much can you adjust that latch? till you dont see it sticking out? This baler is at it last leg. I got an old 237 NH and the it had been parked for over 5 years i cleaned it up and rotated it. I hooked it to tractor and the needles went up but didnt go back? Baler kept running but needles stayed up? I thought the shear bolt on flywheel should have broken off ? Does the speed have to be up on tractor for needles to come back down after knotter grabs string?

Im not understanding. This sounds impossible. The needles go thru the bale chamber very quickly while the ram is backstroked. They must flip back down out of the way to allow the ram an unimpeded forward stroke. For preservation of the needles there is a mechanical safety that sticks up into the bale chamber while the needles are up. This stops the ram dead and shears the bolt. The flywheel continues but the baler is NOT running.

You can observe and trace the motions while turning the baler by hand. When you trigger the knot cycle will delay until ram is on its backstroke. The needles come up while the knot ties and rethread the knotter - then recede quickly as the ram comes back toward the chamber. At running speed, if the ram comes back into the chamber before they are clear they are destroyed. Trace all the drives at hand speed and youll find a loose or sticking or broken part. Then everything will be ok.
larry

Nonsense. The needles travel through slots in the plunger face and cycle when the plunger is rearmost in its stroke. The plunger never touches the needles, and without hay, sticks, or other debris in the chamber, there is no possible way that the plunger can break the needles.

Rick is correct.

I have timed both New Holland and Deere and they are both very similar. The needles begin to stroke and at the point the tips are almost flush with the chamber the plunger should be about 1-2" from them if I remember correctly traveling towards the rear of the baler. As the needles come up through they are running in slots in the face of the plunger. The plunger holds the hay charge in place while the needles are placing the string up into the knotter. At this time the plunger is at it's rear most point holding the hay compressed in the chamber.

I've helped some people who times the baler with the plunger going the other way and it simply doesn't work well. The hay charge presses on the string and needles and it is very hard to get the baler to tie well.

The only thing the safety stop is to prevent is the needles being in the chamber while hay is being stroked in and compressed. In other words if no hay or other object is between the plunger and the needles the needles can be up and should not be hit by anything.

Yeah, you guys are right. I had to go check my baler. I didnt ever focus on that motion closely and see the slots. I just noticed that anytime the needles are up the safety device is up in the chamber. Now I note that the safety pawl will allow the ram to leave the chamber but not re enter it until the needles fully retract. I see this fits the purpose you describe JasG. I would assume this safety device is not functioning on the baler described by peeton59?
larry

 

[JasG]

Yeah, you guys are right. I had to go check my baler. I didnt ever focus on that motion closely and see the slots. I just noticed that anytime the needles are up the safety device is up in the chamber. Now I note that the safety pawl will allow the ram to leave the chamber but not re enter it until the needles fully retract. I see this fits the purpose you describe JasG. I would assume this safety device is not functioning on the baler described by peeton59?
larry

Every time the needles come up the safety latch should come out. If timed correctly the plunger mech is already past it on the stroke. It really should only come into play if a chain breaks and timing isn't correct or the needles don't retract. This would allow the plunger to bring hay into the needles and break them and possibly damage the knotter.

So if the needles stay up and the plunger is able to keep cycling then either the safety latch is stuck or the linkage is broken some place.

 

[peeton59]

I found the problem! There was a small shear bolt where knotters are. Put in another one gonna try it again later. Baler has been sitting over 5 years rats had their way with twine . Had to clean it out fully grease everything ! Have my fingers crossed cuz my 326 NH is about to go out!