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Allis Chalmers Discussion Forum
:

ac 7080 torque limiter vs conventional clutch ?

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cob_crusher

04-28-2008 13:14:10




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i was reading service manual for ac 7080. drive train section shows torque limiter and
belleville washer. how does this work compared to
conventional clutch with pressure plate & springs ? there is not a section on how to align
and tighten these bolts ?




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856 puller

04-29-2008 04:36:23




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 Re: ac 7080 torque limiter vs conventional clutch ? in reply to cob_crusher, 04-28-2008 13:14:10  
the torqurlimiter is the way ac chose to hook the engine to the trans. the plate looks like a clutch disc but it never disingauges. the foot pedal has a cable that goes to a hyd valve that works the powerdirector or a clutch in the power shift. jd did the same thing with there first powershift tractors. i have changed a lot of them but if the seals are good and you dont chisel plow in frozen ground they last ok. as mentioned seals are the biggest problem

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cadet trooper

04-30-2008 17:45:34




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 Re: ac 7080 torque limiter vs conventional clutch ? in reply to 856 puller, 04-29-2008 04:36:23  
Thanks 856 I knew you'd come through I just couldn't remeber if there was a pressure plate there or not it's been over twenty years since I've seen a 7000 series split.



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cadet trooper

04-28-2008 16:02:58




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 Re: ac 7080 torque limiter vs conventional clutch ? in reply to cob_crusher, 04-28-2008 13:14:10  
Basically the clutch plate is held to the flywheel with the belleville spring and spacer arrangement installing them following the torque spec and measurement specified by the manual using the clutch aligning tool with pressure plate. Caution: Make sure that you have installed the latest and greatest rear engine seal and that the rear crankshaft seal OD is free of grooves and the surface is flawless and last I knew they also offered a leak shield but that was years ago. Paying close attention to this could save a split again soon. The installation of the torque limiter is very critical and has been a nemesis for AC for years caused by a fear of a rerun of the early 190 and 200 recall which cost them millions. As a dealer I told them get over it like thier competitors had to do in the growing years. I'm sure someone who does this on regular basis has some shortcuts and positive inputs. CT

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garytomaszewski

04-28-2008 15:58:14




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 Re: ac 7080 torque limiter vs conventional clutch ? in reply to cob_crusher, 04-28-2008 13:14:10  
Because this is a hydraulic system the torque limiter is suppose to slip before you destroy to many other things. that is why there are specs for shims,springs and torque adjustments to properly set the limiter.



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