If you can get 185 that is all a 656 needs. As far as the nut. The early models didn't have the lock nut. You were supposed to put Loctite on the threads. I always put an allen screw to lock threads. When they went to a lock nut and higher pressure pto they changed the spool valve, large nut with seal in and went to a thin spacer. I changed a lot of them on the larger tractors but never worried about the 656 that did not have it . One reason is the new nut with seal does not support the spool as well as old style did as seal was way down inside. If you were having slippage the disc's are most likely toast already.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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