OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

254
Fig. 50 - By-Pass Valve Adjustment
VENT FOR BY-PASS
53. Tube paw Z operat i ng mea tian ism adjus t men t. - Refer
to figure 51.
The adjustment shown on figure 51 is located at the upper tube
pawl operating lever sliding collar. It is an ad,justment that
has been found to be extremely important in order to prevent
the pawls from "sticking" in retracted position when the hoist
is operating to "L01.JERPROJECTILES!!. The adjustment has the
effect of slightly reducing the 1.375 inch stroke movement
transmi tted by the operating piston to the assembled operating
rods.
Preliminary to making the adjustment verify the lengths of all
opera ting rods from clevis pin to clevis pin as shown on the
details; verify the operating piston stroke. Thereafter the
adjustment is made with the pawl unclutched (fully extended
into the hoistway), with the piston "bottomed', with pressure
in the pawl operating system and with lever "C" (pilot and
shut-off valve) set to "HOIST PROJECTILES". Under these condi
tions there is slight pressure on top of the piston (holding
it at "bottomll).
PORT