[AJD] power lift up and down arrows

[Ronald L. Cook]

I always wondered what that was all about.  Thanks for the info, Duane.

Ron Cook
Salix, IA

Duane Larson wrote:

> The best reason I have found for the power lifts having "UP" and "DOWN" cast into the arms and the arrows stamped into the rocker shafts was given in Field Service Bulletin 57 (Jan '36).  The gist is that unless the rocker arms are left in the UP position the pump works against the safety valve at high pressure which overheats the oil and damages the leather cup on the end of the piston.  Leaving it in the UP position allows proper operation of the valves and proper recirculation of the oil.  After detaching implements using the rocker arms, the pedal was to be tripped and the UP and arrow served as a reminder to do this.  When reattaching implements, step on the lever and use a wrench to rotate the rocker arms to the DOWN position.  Model A power lifts PL-5253 and up had the castings, and the B lifts "would have the castings soon".