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I cannot get the automatic chain lube to work - it is a mac 335 chain saw - any ideas

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The pump is fairly simple, however you will need to remove the clutch and sprocket to gain acsess to it, start by removing the two bar nuts and the chainbreak side cover, remove the guide bar and chain, the clutch is just spun onto the crank left hand thread, there are two cut a ways in the clutch centre, this is to take a special tool, once inserted into the cut a ways you use a 19mm spanner to jar the clutch off against compression, an impact wrench works well, the tool is part no. 530031112, you could maybe make a pin spanner to do the job, once the clutch is removed the sprocket will just pull off, there are then two cross head screws securing the pump assembley, the drive gear is pressed onto the crank, the pump pinion runs at right angls to the drive gear, the pinion is nylon so check the condition of the gear, behind the gear is the pick up pipe and filter, you will need to pry off the silver bar protection plate.

Posted on Mar 27, 2011

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