TM 9-2320-260-34
16-34. CRANE SHIPPER, BOOM, BOOM EXTENSION, AND ROLLERS
MAINTENANCE (M819) (Contd)
r. Boom Installation
1. Attach chain and spreader bar to boom (12) and lifting device.
WARNING
All personnel must stand clear during lifting operations. A
q
swinging or shifting load may cause injury or death to personnel.
q Ensure lifting capacity is greater than weight (2820 lb (1280 kg))
of boom. Failure to do so may result in injury to personnel or
damage to equipment.
NOTE
Two assistants will help with steps 2 through 5.
2. Aline retraction port (11) of extension cylinder (2) to upper left side of boom (12).
3. Using A-frame, aline boom (12) to shipper (1) and walk boom (12) into shipper (1). Use lifting device
to raise or lower boom (12) to prevent binding between boom (12) and shipper (1).
4. When chain is near shipper (1), support end of boom (12) with jack stand, remove chain and
spreader bar, and attach chain to end of boom (12).
5. Continue to walk boom (12) into shipper (l). Ensure retraction port (11) is to upper left of
anchor (10) on shipper (1) and center port (9) passes through anchor (10). Seat extension cylinder (2)
on anchor (10).
6. Install nut (8), new locking plate (7), and nut (6) on center port (9) of extension cylinder (2). Bend tab
of locking plate (7) over flat on nut (6).
7. Wrap male threads of pipe nipple (3) and elbows (4) and (5) with antiseize tape.
8. Install pipe nipple (3) and elbow (4) an retraction port (11). End of elbow (4) must point down.
9. Install elbow (5) on center port (9). End of elbow (5) must point down.
10. Remove chain from boom (12) and lifting device.
s. Boom Extension Installation
1.
Attach chain and spreader bar to boom extension (15) and lifting device.
WARNING
All personnel must stand clear during lifting operations. A
q
swinging or shifting load may cause injury or death to personnel.
q Ensure lifting capacity is greater than weight of boom extension.
Failure to do so may result in injury to personnel or damage to
equipment.
NOTE
Two assistants will help with steps 2 through 5.
2.
Using A-frame, aline end of boom extension (15) with boom (12), and walk boom extension (15) into
boom (12). Use lifting device to raise or lower boom extension (15) to prevent binding between
boom (12) and boom extension (15).
When chain is near boom (12), support end of boom extension (15) with jack stand and remove chain
3.
and spreader bar from boom extension (15).
Attach chain to end of boom extension (15) and continue to walk boom extension (15) into boom (12).
4.
Aline holes in boom (12) and boom extension (15), and install two locking pins (13) on boom (12) and
5.
boom extension (15) with two linch pins (14).
Remove chain from boom extension (15) and lifting device.
6.
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