[AJD] power lift up and down arrows

[Steve Treimer]

Duane,
Neat.  Thanks for sharing and researching.
Steve

--- Duane Larson <jdlarson at comcast.net> 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".
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