RonMar
Elite Member
You cannot increase pressure, as that is a factor of the cone/cup spring inside the clutch assembly. You can only adjust if the pressure is applied or not, but not how much.
I don't think the gap at A is important. All it does is adjust the gap at B, which IS important. That adjustment along with the springs in that linkage(at gap A) maintaining the gap at B. If you are not touching at B you are getting as much force as you are going to get. If when you opened the access cover you didn't have any gap at B, that was your problem as the main pressure plate was "hanging" on those fingers/levers preventing full pressure from being applied. If you did have a gap at B when you first got in there, your clutch friction disc is probably shot. And of course as the disc wears down, the spring extends more and more lessening the available pressure to be applied so once they start slipping they usually fail completely shortly after that...
When you step on the pedal, the bearing slides forward pushing on the fingers at "B". That gap is your clutch pedal freetravel. When pressed upon, the fingers/levers lift the main plate at 3 locations(A) compressing it's cone spring and releasing the main clutch disc. As that main plate lifts, it in turn lifts the PTO plate releasing the PTO clutch disc. It lifts the PTO plate at those 3 adjuster nuts located between the lever/finger adjusters(at A) as you go around the clutch assembly. One way to gauge how much your main clutch disc is worn is to look at the gap between the main and PTO plates on those other adjusters. As the main disc wears the gap between the main and PTO plates decreases as there is less and less disc material to hold them apart.
Looking at your pics, it does not appear that you have a lot of gap between the main and PTO pressure plates...
Here is a link to Johns Jinma website(great jinma 254/284 resource) and a clutch adjust procedure. He was not adjusting the main clutch in this procedure, but the relationship between main and PTO, but the pics are very good. On the second to last pic, note the gap between the main and PTO pressure plates at those alternate/PTO adjuster nuts It is WAY larger than your appears to be JMClutchAdj
I don't think the gap at A is important. All it does is adjust the gap at B, which IS important. That adjustment along with the springs in that linkage(at gap A) maintaining the gap at B. If you are not touching at B you are getting as much force as you are going to get. If when you opened the access cover you didn't have any gap at B, that was your problem as the main pressure plate was "hanging" on those fingers/levers preventing full pressure from being applied. If you did have a gap at B when you first got in there, your clutch friction disc is probably shot. And of course as the disc wears down, the spring extends more and more lessening the available pressure to be applied so once they start slipping they usually fail completely shortly after that...
When you step on the pedal, the bearing slides forward pushing on the fingers at "B". That gap is your clutch pedal freetravel. When pressed upon, the fingers/levers lift the main plate at 3 locations(A) compressing it's cone spring and releasing the main clutch disc. As that main plate lifts, it in turn lifts the PTO plate releasing the PTO clutch disc. It lifts the PTO plate at those 3 adjuster nuts located between the lever/finger adjusters(at A) as you go around the clutch assembly. One way to gauge how much your main clutch disc is worn is to look at the gap between the main and PTO plates on those other adjusters. As the main disc wears the gap between the main and PTO plates decreases as there is less and less disc material to hold them apart.
Looking at your pics, it does not appear that you have a lot of gap between the main and PTO pressure plates...
Here is a link to Johns Jinma website(great jinma 254/284 resource) and a clutch adjust procedure. He was not adjusting the main clutch in this procedure, but the relationship between main and PTO, but the pics are very good. On the second to last pic, note the gap between the main and PTO pressure plates at those alternate/PTO adjuster nuts It is WAY larger than your appears to be JMClutchAdj
