(32). Assemble the cylinder head (32) and its gasket (33) to the cylinder body, and install the four round-
head machine screws (30) and lockwashers (31).
(4) Slide the dust cap washer (28), felt (27), dust cap (26) and dust cap retainer (25) over the piston rod and
down against the cylinder head. Attach the right-hand lock clip (23) and right side of the retainer (25) to the
cylinder head with a roundhead screw (21) and lockwasher (22). Assemble the lock (20) to the right-hand
lock clip (23) and the left-hand lock clip (24) to the lock. Attach the left-hand lock clip and left side of the
retainer (25) to the cylinder head with the remaining roundhead screw (21) and lockwasher (22).
(5) Temporarily install the hex jam nut (2) and connecting block (19) onto the end of the piston rod (10).
Assemble the bellcranks (15 and 17) to the cylinder head arm and connecting block (19) with the bearing
pins (11 and 13). Position the bearing block (16) between the bellcranks and install the drilled bearing pin
(14).
(6) Place the assembled cylinder on a flat, smooth surface and press the piston rod in the fully retracted
position. Measure the distances from the surface plate to the center of the drilled bearing pin (14) and from
the surface plate to the center of the cylinder head arm bearing pin (11). The center of the drilled bearing
pin should be 11./16 inch lower than the center of the upper bearing pin. If this measurement is less than
11/16 inch, the connecting block (19) must be screwed further onto the piston rod. If the measurement is
greater than 11/16 inch the connecting block must be backed off slightly. Repeat the measuring and
adjusting 'process until the measurement is exact. Then tighten the hex jam nut (2) and install the
connecting block bearing pin (13). Lock the two bearing pins (11 and 13) with the special cotter pin (18).
(7) Fasten the mounting bracket (37) to the air cylinder with the two flathead screws (36).
e. Installation (fig. 25).
(1) Fasten the air cylinder (21) and its bracket to the top of the shutter assembly with the two hex bead bolts
(20) and lockwashers (5). The shutter control rod (23) must be inserted up through the bearing block and
drilled bearing pin at the end of the bell cranks. Install the hex nut (22).
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