How to adjust "set screw" in Lionel motor?

Which motorized unit? I know of no set screw in the traditional motorized units (numbers 41 through 68)...

It is 6-18458 Denver and Rio Grand Western snow plow with TMCC. I think it is from 2000.

it does have a set screw and page 10 of instructions shows a picture.

it says to unscrew it, but does not say with what tool.

I think you need a small (sorry, don't know size off the top of my head) Allen key wrench or jewelers screwdriver with a similar hexagonal head.

-Dave

Ah..

It seems you are talking about this:

I believe it is a hex drive... I can't immediately say which size...

 

 

Thanks to all.

I will give it a try tomorrow.

The picture of the part does look like it.

The tool is called an Allen wrench.

Dave45681 posted:

I think you need a small (sorry, don't know size off the top of my head) Allen key or jewelers screwdriver with a similar hexagonal head.

-Dave

That is correct. Once removed you can put a drop of oil in the hole. Usually after inserting the screw, screw till bottoms out then back off. The amount varies but 1/4 to 1/2 turn may do it. You should be able to spin the wheels with your thumb when correct. This is how I adjusted the armature play on the 1980’s SD 40’s. 

I believe the hex wrench size is 0.050".

TRW

Yes!

I have an Allen/hex wrench that fits!

I was able to adjust the motor this morning to where it still growls but is much quieter and runs more smoothly.

Thank you everyone!

Why is this set screw used on some motors and not on others ?   

It simply is a design variation.

So there's no need to have any adjustment screw in the motors that have the brass tongue and oil wick ?

Those style motors typically make use of shims instead.

Is there supposed to be a bearing?

if so, what is the part number?

Jeff2035 posted:

Is there supposed to be a bearing?

if so, what is the part number?

The specifics vary depending upon implementation. You would need to confer with the appropriate service documents for the product in question.

The purpose is to stop armature bounce . It shouldn't be tight, but rather just barely not making contact. i.e., touching, then backed off till the armature spins free. How you stop the bounce; by shim or screw really makes little difference.

Dan Padova posted:

So there's no need to have any adjustment screw in the motors that have the brass tongue and oil wick ?

The motors which lack a set screw have a pair of ball thrust bearings between the worm gear and the armature, one one each side of the bronze sleeve motor bearing. The F3/GP motor is of this design as is the GG1/cast-frame-NW2.