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HO Scale AC-12 Gear Box Replacement 

Instructions 

Introduction – 

Thank you for your purchase of the HO Scale AC-12 from InterMountain 
Railway Company.  The enclosed gear box kit will increase the speed of 
your locomotive.  Please read all the instructions thoroughly so that you 
have a clear understanding of the activities required before beginning.  Be 
aware that you will be working with very small parts and should have an 
area to keep them from getting lost.  You will also be removing delicate 
details so extra care should be taken so as to not damage the parts.   

Tools required – 

 

Small flat blade screw driver 

 

Small Phillips head screw driver 

 

Locomotive cradle/holder 

 

Scotch Tape (optional) 

The gear box replacement is a multi-part procedure that will require 
comfort and skill working with detailed models.  It is recommended that 
you take your time so as to complete the replacement successfully.  The 
diagrams are on separate pages from the instructions.  Since this process 
will involve several small pieces it is recommended that you utilize scotch 
tape to attach the small parts to the diagrams as you disassemble the 
model.  This will insure that parts will not inadvertently get mixed up during 
the assembly process. 

Should you have questions, please feel free to contact InterMountain 
Railway Company for assistance. 

 

 

 

Summary of Contents for AC-12

Page 1: ...arts Tools required Small flat blade screw driver Small Phillips head screw driver Locomotive cradle holder Scotch Tape optional The gear box replacement is a multi part procedure that will require co...

Page 2: ...e 1 Step 3 Loosen the grab irons from cab doors on each side of the locomotive cab Loosen the connecting grab iron from the back of the cab below the window See Figure 2 Step 4 Loosen the detail pipin...

Page 3: ...Lift the weight out of the way being careful not to pull or jerk on the wiring See Figure 7 Step 10 Lift the motor out of the frame removing the drive shaft from the gear box end and setting the motor...

Page 4: ...fully threading the pickup wires through the frame Once they are fitted back together screw in the four screws from the top and the one screw from the bottom See Figure 8 Step 18 Reinstall the motor a...

Page 5: ...from the locomotive boiler Details will need to be reattached on each side See Figure 3 Step 24 Reattach the grab irons to the cab doors along witggh the connecting grab irons on the back of the cab...

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