12Turn the machine upside down, and you can replace the cutter blade or thenylon cutting head easily.– Insert the hex wrench through the hole in the gear case and rotate the receiverwasher (4) until it is locked with the hex wrench.– Loosen the nut (1) (left-hand thread) with the socket wrench and remove thenut (1), cup (2), and clamp washer (3).Mounting of cutter bladeWith the hex wrench still in place.– Mount the cutter blade onto the shaft so that the guide of the receiver washer(4) fits in the arbor hole in the cutter blade. Install the clamp washer (3), cup(2), and secure the cutter blade with the nut (1).[Tightening torque: 13 - 23 N⅘m]NOTE: Always wear gloves when handling the cutter blade.NOTE: The cutter blade-fastening nut (with coned disc spring) is a consumablepart.If there appears any wear or deformation on the coned disc spring,replace the nut.Mounting of nylon cutting head– The clamp washer (3), cup (2), and nut (1) are not necessary for mounting thenylon cutting head. The nylon head should go on top of the receiver washer(4).– Insert the hex wrench through the hole in the gear case and rotate the receiverwasher (4) until it is locked with the hex wrench.– Then screw the nylon cutting head onto the shaft by turning itcounter-clockwise.– Remove the hex wrench.– Make sure that the blade is the left way up.MOUNTING OF CUTTER BLADE OR NYLON CUTTING HEADRotationTightenHex wrenchLoosen(4)(2)(1)(4)(3)