Is this how a Spicer 3053A works?

Inspired by a recent thread about a concerning drivetrain noise at 3rd gear and higher, I took a hard look at a diagram out of the maintenance TM for the Spicer 3053A. I am by no means a transmission expert, so this has been a bit of a learning experience. Whoever designed the very first shifting gearboxes was a freakin' genius

Anyway, I wanted to create some kind of transmission power flow diagram. I saw such a diagram in a shop manual I had for the Ford 1801 industrial tractor with the Select-O-Speed semi-automatic transmission. So for those who are more familiar with this Spicer unit and transmissions in general, did I get this right?



Diagram taken from TM9-2520-246-34-1 pg. 2-4.

HDN said:

...... did I get this right?

Click to expand...

99% correct.....
In your last diagram (R), it's the large gear on the mainshaft that moves back and forth, between 1st, N and Rev., so the arrow should be on the upper gear. (I know, that original drawing can be a bit confusing...)

The powerflow for all positions can be found in the -34 TM, Fig. 3-12. While the drawing is correct for the 3053, it actually shows the different speeds for the 3052 (5th-direct).
I just edited that page for it to be accurate for the OD transmission.