Hello. Here’s an oldie but a goodie. I have a 1969 GMC K3500 3/4 ton pickup that I use as my driveway plow. The last time I used it, I noticed that the clutch stopped engaging after a particularly long plow session. I stepped on the pedal and it wouldn’t engage, and the gears would just grind. I parked it, and started it up again the next morning to finish plowing and it was fine. I figured something had just gotten frozen from the heavy, wet snow. I did get it stuck in snow banks a few times. I left it parked for a few months and then started it up during the summer and the clutch would not engage again.
The bottom plate that covers the clutch access has always been missing, and I figured some snow and ice had frozen up the linkage, but that’s apparently not the problem. I thought maybe the friction plate had no material left on it, but then why would it be fine the next morning? Does this thing need a new clutch, or is there something frozen in the mechanism that might be easily repaired?