2-28. MAINTENANCE OF BOOM AND WINCHCONTROL CYLINDERS AND AT-
TACHING PARTS AND BOOM CONTROL CYLINDER ASSEMBLY (CONT).
16 Aline pin hole in cylinder boom barrel
with pin hole in boom cylinder head ex-
ternally threaded ring. Insert new cotter
pin (14) through pin holes to secure
boom cylinder head externally threaded
17 Install two new preformed packings (15),
and two machine thread plugs (16).
1 Refer to TM 9-4940-468-14 for test setup
4 Connect hydraulic line or hose (4) to port
and testing procedures.
(3). Leave port (5), at closed end of boom
control cylinder assembly (2), open.
2 Retract hydraulic piston (1) into boom
control cylinder assembly (2).
5 Apply 4000 psi (27,580 kPa) hydraulic
pressure to boom control cylinder
3 Fill boom control cylinder assembly (2)
assembly (2) through hydraulic line or
through upper port (3) with hydraulic fluid
hose (4) for 5 minutes.
(item 10, appx B).