OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER
OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER
OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
304<br />
and the control rods between the A and B-ends correctly adjusted,<br />
the clevis 274334-9 is to be adjusted so that the center<br />
line <strong>of</strong> the lever- 274331-7 lines up with the center line <strong>of</strong><br />
the valve 274335-4 in the foot valve body. Clevis 274335-2<br />
is next to be adjusted, so that there is .020 to .0.25 inch<br />
deflection <strong>of</strong> the spring 274334-2 when the valve 274335-;-4 is<br />
seated against its seat 274335-7. This adjustment is to be<br />
made.when the center line <strong>of</strong> the lever 274331--'7 lines up exactly<br />
with the center line <strong>of</strong> valve 274335-4.<br />
87. Dashpot adjustments. - Refer drawings number 274249,<br />
,274251 and 274265. The external coupling' <strong>of</strong> the piston to the<br />
'control shaft lever and the internal restrictions <strong>of</strong> this de-<br />
,vice require adjustment.<br />
, , .<br />
'The coupling adJustment at the adjustable clevis is important<br />
in order to assure full control movement <strong>of</strong> the control lever<br />
and the cam arms. It is made by adjusting the connection so<br />
that thep~ston,dqes,notlrbottomn ahead <strong>of</strong> either extreme movement<br />
<strong>of</strong> the 'control lever. The piston has total possible movement<br />
slightly greater than that imparted by full control lever<br />
movement. .<br />
The restriction adjustments are made to limit the time <strong>of</strong> full<br />
piston stroke to three seconds.<br />
Adjustments #1 and #2 control the speed <strong>of</strong> shifting the control<br />
lever. Adjustment #1 controls the speed <strong>of</strong> depressing<br />
the piston and #2 controls the speed <strong>of</strong> withdrawing the piston.<br />
88. Latch and vent valve earn adjustment. Automatic<br />
stopping action is obtained in servo mechanical control to<br />
stop the hoist at the loading and unloading stations, by the<br />
venting action <strong>of</strong> the latch and vent valve. Such valve movement<br />
is controlled by the adjusted positions <strong>of</strong> the ~dges <strong>of</strong><br />
the notch formed by the two segments <strong>of</strong> the latch and vent<br />
valve cam. Refer drawing 236578.<br />
The adjustments are made by positioning cam segment 234058-1<br />
to permit latch movement when mark #1, figure 57, is aligned<br />
as in paragraph 80, operation 9, and, positioning cam segment<br />
234058-2 similarly when mark #5, figure 58, is aligned as in<br />
paragraph 80, operation 22.<br />
89.<br />
operating<br />
TROUBLEDIAGNOSIS<br />
This section <strong>of</strong> the text covers a series <strong>of</strong> possible<br />
troubles, together with suggestions for locating
Change language