Repair split axles on Bachmann's N scale 4-8-4 locomotives.
- Thread starter Ray Marinaccio
- Start date
Remove the crank pins on the second set of drivers and remove the cylinder block and valve gear.
then remove the remaining crank pins and siderods. The pins are pressed in and can be pried out with a small screwdriver.
Remove the drivers from the frame by prying them outward with a small screwdriver.
then remove the remaining crank pins and siderods. The pins are pressed in and can be pried out with a small screwdriver.
Remove the drivers from the frame by prying them outward with a small screwdriver.
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Remove the side frame rail screws, remove the frame rails and gears.
Wash all the parts ( except motor) with warm soapy water and dry thoroughly.
Cut 4 sleeves from 3mm ID brass tubing.
2 .130"
2 .065"
The 2 sleeves on the rear axles must be shorter to provide clearance for the reduction gear.
Wash all the parts ( except motor) with warm soapy water and dry thoroughly.
Cut 4 sleeves from 3mm ID brass tubing.
2 .130"
2 .065"
The 2 sleeves on the rear axles must be shorter to provide clearance for the reduction gear.
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Installing the drivers.
I start with the right rear driver. Put a dab of grease on the driver bearing and a small amount of Loc-Tite on the axle and press the driver into the axle center.
Rotate the the reduction gear counterclockwise untill the crank pin on the rear driver is at the 12 O'clock position. This takes the play out of the gear train.
I start with the right rear driver. Put a dab of grease on the driver bearing and a small amount of Loc-Tite on the axle and press the driver into the axle center.
Rotate the the reduction gear counterclockwise untill the crank pin on the rear driver is at the 12 O'clock position. This takes the play out of the gear train.
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Lube and Loc-Tite the next driver and press it in with the crank pin in the 12 O'clock position. Rotate the gear train by the reduction gear to verify the 2 drivers are in time. Re adjust the driver if necessary. If you use super glue instead of Loc-Tite this must be done quickly before it sets.
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Rotate the drive train until the 2 installed drivers are in the 12 O'clock position, then lube and Loc-Tite the next driver and install it in the 12 O'clock position. Rotate the gear train by the reduction gear to verify the 3 drivers are in time. Readjust the driver if necessary.
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Rotate the drive train until the 3 installed drivers are in the 12 O'clock position, then lube and Loc-Tite the next driver and install it in the 12 O'clock position. Rotate the gear train by the reduction gear to verify the 4 drivers are in time. Readjust the driver if necessary.
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