4-6-4 J3a Hudson Steam Locomotive 19
7. Lift the gearbox up and out of the chassis,
rotate 190 degrees to reveal the now exposed
gears and lubricate with a light grease.
Remove Gearbox Casing Screws
Figure 18: Gear Box Top Access Cover
Pull Gearbox up and rotate to expose gears for greasing
Figure 19: Insert Grease Into Gear Box
Traction Tire Replacement Instructions
Your locomotive is equipped with two neoprene rubber traction tires on the rear set of
flanged drivers. While these tires are extremely durable, you may need to replace them
at some point.
1. Remove the side rods from the wheels in order to slip the new tire over the grooved
drive wheel. Make sure to note the position of all rods before removing.
2. Make sure the old tire has been completely removed from the groove in the drive
wheel, using a razor blade or small flathead screwdriver to pry away any remains.
3. Slip the new tire onto the wheel. You may find it useful to use two small flathead
screwdrivers to stretch the tire over the wheel.
4. If you twist the tire while stretching it over the wheel, you will need to remove and
reinstall the tire. Otherwise your engine will wobble while operating.
5. Make sure the tire is fully seated inside the groove. Use a razor blade to trim away any
excess tire that doesn’t seat itself inside the groove properly.
6. Reinstall the side rods in the same positions as noted. Failure to align rods may cause
binding or damage to the drive system.
One set of replacement tires is packaged with your model. Additional sets are available
directly from the M.T.H. Parts Department (order online: www.mth-railking.com,
e-mail: [email protected]; mail: 7020 Columbia Gateway Drive, Columbia MD
21046-1532, FAX: 410-381-6122).
