Loco Repairs – Motor Swap Out Bachmann Class 47 (OO Scale 1:76 Model) Part Two

Loco Repairs – Motor Swap Out Bachmann Class 47 (OO Scale 1:76 Model)

Part two of this motor replacement article. Here we pick up from where we left in part one. We’re now at the stage to release the bogies & lower chassis to gain access to the motor.

Next job is to release the four pick up wires (two from each bogie) Make a note of which colour goes where. Now carefully pull the wires free from the PCB board.

Next unscrew the bogie gear tower screws to release the bogies.

Having released & removed the bogie/gear towers, un-clip the lower chassis. There is eight clips with four on either side of the chassis as shown on the right. Carefully un-clip the lower chassis. Be aware the lighting wires will still be attached. There is just enough room now to gain access to to release & remove the motor.

Insert a flat bladed screw driver into the gap as shown in the photo on the right. Slide the screwdriver between the motor & the chassis. Leaver the motor downwards to un-clip it from the two clips on the underside of the metal upper chassis. The motor will break free. Now carefully slide the motor along to one side & remove through one of the bogie chassis holes.

Now fit the new motor into the two clips, the new motor must go as shown in the photo in the right.

Next feed the the orange & grey motor wires back through the holes in the chassis. You may find it’s easier to do this before clipping the motor back in to place. Be sure not trap any wires whilst clipping the motor back into place.

Re-fit the lower chassis back into place. Make sure no wires are trapped & that all clips engage properly. On the ends of the loco make sure all the lighting wires sit flush as shown in the second photo on the right.

Re-fit each bogie. The coupling NEM box on the bogies must face towards the outer ends of the loco. Re-engage the drive shafts into the motor fly wheels as shown on the right.

Feed the two pick up wires (red & black) through the holes in the chassis. The centre top screw hole on the bogie gear tower sits as shown in the second photo on the right.

Re-fit each screw on to the top of the bogies. The bogies should be able to turn freely without any resistance.

Now reinsert the four red & black pick up wires on to the PCB board as shown on the right. Then replace the four black plastic sleeves to hold the wires in place.

Now re-fit the the orange & grey motor wires as shown on the right, & refit the black plastic holding sleeves.

Re-fit the two screws to hold the PCB board back into place.

Next if on DCC place loco onto the programming track & get the DCC controller to read back the loco address. If all okay, then place onto the track for a test run. If on analogue place on the track & test run.

Once happy refit the body making sure the fan end sits over the recess in the chassis that takes the speaker (if fitted).

The run in the loco at slow to medium speed to bed in the new motor. It’s a good idea whilst replacing the motor to clean & service the gears, pick ups & wheels.