[Bobbar]

Hello All,

I have a 1967 124 that I've been using for 3 years now for mowing and plowing. And over the last season or two I've noticed an intermittent surging or jerking motion while driving on a slight decline. I realize some slack is going to be normal, but I wanted some opinions as to whether I should be concerned.

There's one point in my yard that's on a slight decline with some uneven ground, and the tractor feels like it speeds up slightly as it rolls into a depression, slows and recovers, then kinda jerks it's way back out. And a slight oscillation in speed continues for a moment where it levels out until I start up a slight incline nearby. My foot remains off the clutch, and engine speed is solid the whole time.

I've noticed an even more pronounced surging motion while slowly reversing uphill in the driveway. It almost feels as though the wheels are oval shaped...

If I rock the tractor while off and in gear, it feels fine to me. Just a slight rotation of the wheels and driveshaft.


A little maint. history:
The drive plate is original, but the pins had been sheared off at some point in the past, and the previous owner (my grandfather) had drilled new holes and installed some hacked off bolts to repair it. I've since replaced those with new higher grade bolts, as the old ones where very worn on the sides.

The clutch is fairly new and engages smoothly with no squeaks. I try to keep it well adjusted. It has one clutch clip installed. The holes are slightly warn and oval shaped, but play in the drive shaft couldn't be more than a few 16ths of an inch.

The trans oil was replaced not long after I got the tractor (3 years) with SAE 30 oil. I have no idea how long it had been since the previous trans oil change, but the oil looked OK aside from a few small chips of metal. Gramps wasn't one to be too bothered by grinding gears...

Let me know what you think.

Thank you,
Bobby