Clutch shaft roll pin modification and replacement

 
<p class=”p1″><span class=”s1″>After 1310 hours on my Jinma/Farmpro 254 tractor with FEL I have sheared the roll pin on the clutch arm. This is the second time this now has happened. The first repair took four hours and this repair took 3 hours. </span></p>
<p class=”p2″><span class=”s2″>This time I decided to modify the bell housing reinforcement boss that<span class=”Apple-converted-space”>  </span>makes this repair so time consuming. On the first repair I used an extra long roll pin. This repair was easier because I could grab the ends of the sheared pins and readily remove them. </span></p>
<p class=”p2″><span class=”s2″>Once the sheared pins were removed I used a pry bar to force the clutch rod from the shaft. The pin sheared in three spots. There remained the third piece in the clutch shaft To gain access from the top of the clutch shaft I ground the cast iron reinforcement boss above the clutch shaft with my die grinder. The metal removed allowed me room to drive out the remaining roll pin from above. The bore hole in that clutch shaft I measured using drill bits. A .303”drill bit would not pass through clutch rod hole. A .288”drill bit passed through the clutch rod hole.<span class=”Apple-converted-space”>  </span>My replacement roll pin was .328”. I decided to pre crush the roll pin in my bench vise. It now measured .310 with .20” of collapse potential remaining. </span></p>
<p class=”p2″><span class=”s2″>I throughly cleaned the area and lubed the clutch shaft rod entering the bell housing with white lithium spray grease. I also put witness alignment marks on the clutch rod and shaft. </span></p>
<p class=”p2″><span class=”s2″>I placed the roll pin on the bottom of the clutch rod enough to allow me to slide it onto the shaft. With the ground away reinforcement boss I could now easily line up the roll pin bore from above. The roll pin easily tapped into place from below using a hammer and drift. </span></p>
<p class=”p2″><span class=”s2″>I have ordered from EBay what are called stainless steel coiled spring pins.Theses are more durable than the steel roll pins from the factory. I will use them for replacement next time. </span></p>