6 No leakage is allowed around open port (5), around hydraulic piston (1), or around boom
cylinder head (6).
7 If leakage occurs, disassemble boom control cylinder assembly (2) and check for damaged
8 If no leakage occurs, reduce pressure and remove hydraulic line or hose (4).
9 Drain hydraulic fluid (item 10, appx B) and plug cylinder ports (3) and (5).
l Hydraulic system is under high
pressure. Follow hydraulic
system safety procedures to
prevent injury (TM 9-2350-
238-20-2). Wipe up all spilled
l Make sure hydraulic system is
depressurized before performing
any hydraulic maintenance to
prevent injury to personnel.
l Use hoist with minimum lifting
capacity of 2000 lb (908 kg) to
prevent injury to personnel and
damage to equipment.
l Another M578 Recovery Vehi-
cle or M88A1 Recovery Vehicle
may be used, if available, for
l The following steps are written
and illustrated for installation of
one boom winch control
cylinder assembly, but apply to
1 Secure sling around boom winch control
cylinder assembly (1). Lift boom winch
control cylinder assembly and lower
through cab door into place.