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First of all the Gravely is probably the most rugged, durable, longest lasting machine ever made. Properly maintained, it should last at least 50 more years.
The engine is a common Kohler K301. As such it has all the same issues as any other Kohler.
oldgravelys.net has all the manuals. I recommend you read them thoroughly.
If it were mine, I do a through maintenance on it. That means
Change the oil in the transmission - 5 quarts
Change the engine oil
replace the fuel filter
clean the carb
Grease the attachments per the manuals.
Check the bolts for the front PTO engagement
Check the 30" mower - Hitting a stump can bend the shaft and make the mower vibrate.
Check the hi-lo and fwd-rev clutches for tightness. Too loose means slippage and that means premature wear.
The 40" mower is a great finish mower. Check the idlers for noisy bearings and replace as needed. Grease the spindles.
They were a very expensive machine new. Just the tractor cost about 25% of the price of a new car. That means that today that tractor would cost $7500. The mower decks were expensive too.
You are very fortunate to have a workhorse of that caliber.
PM sent.
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