Packard Forum Index » Pre-War (1899-1942)

So, I'm trying to find an answer to this. Here are two rear backing plates. The one on top is a known 120-C back plate that came from a field car. Its configuration matches my 115-C backing plates, just 12" instead of 11".




You'll see that the hole where the top anchor pin passes through is round; the pin can be rotated to adjust the position of the shoes because it's eccentric.

Now here is another 12" backing plate that was marked 37 120-CD, but its hole is not round; it's keyed so the pin can only go in one of two orientations.




They also have two different casting numbers,with one on top having a higher number and the one on the bottom having a lower number. The casting numbers are only five digits and do not match any of the part numbers.

So the question is.... what did that bottom plate come off of?

Every Packard backing plate I have seen has a round hole, and a 360-degree adjustable eccentric.

I'm pretty sure that "odd" backing plate is a 35-36 120 plate.

The 120-B owner's manual for brake adjustment states to loosen the anchor pin nut and tap the anchor pin with a hammer to adjust its position in the "elongate hole".

The 120-C owner's manual for brake adjustment states to loosen the anchor pin nut, then rotate the anchor pin to perform the adjustment.

The parts manual lists one set of backing plates for 35-36, and another for 37+.

So round hole plate, 37 and up. Elongated square hole plate, 35-36.