Jinma 284 – clutch pedal free play increasing

I did have the roll pin shear two years ago and installed hardened American made roll pins at that time. I checked play at that point and it looked good.

Okay Tommy, I'll try adjusting the clutch. Is the procedure posted by Spiker on Johnstractor website still the definitive document on adjusting the Jinma clutch or are there other wirteups I should be referencing in addition to the procedure by Spiker?

Well I removed the front loader & bracket to gain access to the clutch bell housing. First step was to label each of 3 PTO adjustment and clutch finger adjustment points. Using a clutch adjustment procedure I found on another tractoer website, I adjusted the clearance on the PTO adjustment nuts to 0.035″. Prior to adjustment the clearances ranged from 0.036″ to 0.048″.

ALong the way I noticed that I had a lot of rotational freeplay between the clutch external linkage arm and the clutch crossshaft, so I pulled out the rollpin that holds them together. The pin came out in pieces, so It had fractuired. I put in new rollpins, an outer M8 pin and an inner M5 rollpin. I had replaced the rollpins five years ago with high quality american made rollpins, so apparently even this is not a permanent solution

Before beginning the clutch finger to throwout bearing adjustment, I adjusted the external clutch linkage (clevis & threaded rod) to about midpoint in its adjustment range. I made a 1/16″ feeler gage out of a strip of 1/16″ stainless steel and used that to set the clutch finger to throwout bearing clearance. This yielded about 1″ of clutch pedal freeplay.

I'm happy to report that both the main and pto clutches are working well again. The PTO is now completely disengaged with about one inch of pedal movement remaining. Also, there was no dust in the bell housing and the clutch fingers and throwout bearing seemed fine.

The clutch linkage is clearly a weak point in the tractor. Does anybody have a better solution than harder rollpins? I would pay big bucks for a cross shaft and external linkage arm with splines rather than rollpins.