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In Reply to: JD STX 38 mower - turn key, it clicks but won't start. posted by Jason on Thursday, April 10, 2008:
Bit more information on what I found out.
I took the top cover off the engine. it exposed the fan and gearset (Big gear on Fan/Crankshaft, little pinion on starter motor).
I took out the starter motor, and I applied 12V directly from the battery (Positive to the bolt stud, Negative to the case). The Motor turns. The gear turns too. (The pinion seems to have one way bearing of some sort)
I put the starter motor back, and applied the 12V, and the pinion gear does not turn. Motor shaft vibrates, and the pinion gear does not rotate. I am not sure if the shaft is turning nor not. What's wrong with the pinion?