f. Extending and Retracting Boom Extension.
Extend and retract the boom extension carefully to avoid damage to the crane.
(1) Extending boom extension.
(a) Remove boom extension retaining pins (2) secure boom extension (1) inside boom
(b) Extend boom (3) to its maximum length with crowd control lever.
(c) Remove three-piece boom extension pushout rod (5) from stowage and assemble.
(d) Place rod (5) between V-shaped brackets (6) at ends of shipper (4) and extension (l).
(e) Slowly retract boom (3) with crowd control lever to push out boom extension (1)
until pin hole in boom (3) and extension (1) aline.
(f) Insert boom extension retaining pins (2) in holes and remove pushout rod (5). Take
rod apart and stow.
(2) Retracting boom extension.
(a) Remove boom extension retaining pins (2).
(b) Use hoist control lever to slowly raise crane block (7) until it contacts lower part of
boom sheave (8).
(c) Keep hoist control lever in UP position until crane cable pulls boom extension (1)
back to its fully retracted position.
(d) Aline boom extension retaining holes with boom holes and insert boom extension
retaining pins (2) in holes.