gravely tractor Mod. #424

wont move forward or reverse. I know it has a clutch cup at both ends and they look OK is there another clutch for forward and reverse?
 
Clutches look ok, so you've split the tractor already? There's plenty of adjustment to the clutches, did you try that before getting inside? Did it make ANY noise when you tried forward and reverse? Just the one "cone" clutch for forward/reverse, i'd replace it while you're in there. Does the forward/reverse handle move the clutch?
 
ALSO, check to see if the frame is cracked/broken where it bolts onto the transmission. The 400 series was prone to do just that....right side of tractor, same side as forward/reverse lever. It'll flex just enough that forward/reverse won't work very well...
This picture is of the left side of the tractor, but frame attaches to trans on the far left of pic, about the middle of the pic - right side is mirror image....
a127873.jpg
 
There is a high/low clutch on the axle also. is inside next to the differential. its a 3 or 5 tooth metal piece that slides in or out when you shift. Its the same setup used on the walkbehinds. this can get stuck in between and not engage the teeth on either side, resulting in no movement also. Its been a long time since i took one apart to repair, but if the metal teeth wear (and they usually do), it can ratchet against the spring and not move either. I don"t believe it makes enough noise to hear it over the engine when it slips.

its also possible to sheer of or lose the metal keys in the axle hubs. If this is true, you can get off and see the axles turning inside the hub on one side or both.
This link should take you to the service manual, which has everything you need to know about your tractor.

http://gravelytractorclub.org/images/PDFs/manuals/riding-tractors/400%20series/424_430_432_450_Serv_Man_0972.pdf
Gravely 424 Manual
 

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