Electrical Projects Next, check the motor for faulty operation. Remove the motor from the shear. Check with a known-good battery pack. The current reading ought to fall between 0.9 and 1.2A. Should the reading be higher, replace the motor.

Noisy operation may be traced to wear on the gear train, cam, or ring insert. If the gears are still good and the blades sharp, replace the ring. The armature side-to-side play should be no more than 1 / 32" and preferably less. Individual spares are not available; replace the motor as a unit.

If the blades jmain motionless while the motor runs, check for stripped gear teeth and for a loose drive pinion. A loose pinion means that the motor and pinion must be replaced.

No blade movement and no motor sound usually means a failure in the electrical circuit. Check the battery pack, wiring harness, switch, and motor. The switch contacts should arc slighdy as they are opened.



Disassembly

Disassembly is not difficult. Take out the three housing screws from the right side of the housing. Separate the parts. Next, remove the lock-button assembly by lifting the lock button out of its slot in the switch plate. This frees the switch button from its slot in the switch-button plate. Remove the contact switch from the shear by disconnecting the positive (red) battery wire from the top leaf of the switch and the positive motor wire from the bottom leaf. Now remove the terminal-board assembly by disconnecting the battery and motor leads. Take out four blade screws from the blade-base housing and remove the blade assembly from the base. To separate the blades, turn the top one 90 degrees to the bottom one and push the blade insert out from between them. Remove the large cam gear and the small combination gear from the blade-base housing . Then remove the motor-mounting screws and free the motor.





Page 1 2
Home > Electrical Projects > Repairs > Cordless Appliances

November 20, 2008