TM-9-2320-272-23-4

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 4 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-4

  TM-9-2320-272-23-4 - Page 873 of 1393

REMOVAL
CAUTION
When disconnecting hydraulic lines and hoses, plug all openings to prevent dirt from entering
and causing internal parts damage.
NOTE
•
Left and right elevating cylinders are removed and installed in the same way. Right
elevating cylinder is shown.
•
Have drainage container ready to catch oil.
•
Use drain pans to retain leaking/draining fluids. Refer to local procedures and plans for
preventing and responding to fluid spills or leaks. Comply with local regulations when
disposing of clean up material and leaked and spilled fluids.
•
Tag lines for installation.
1.
Disconnect cylinder oil supply line (Figure 1, Item 6) and oil return line (Figure 1, Item 5) from cylinder adapter
fitting (Figure 1, Item 11) and snubber valve (Figure 1, Item 10) at bottom of elevating cylinder
(Figure
1,
Item
12).
WARNING
•
Assistant must remain at crane controls until removal operation is completed. Injury to
personnel may result if boom control lever is accidentally engaged while work is being
done between raised boom and swivel base. Failure to comply may result in injury or
death to personnel.
•
All personnel must stand clear during hoisting operations. A snapped cable, or swinging
or shifting load, may occur. Failure to comply may result in injury or death to personnel.
2.
Using chain (Figure 1, Item 13) and lifting device (Figure 1, Item 14), lift boom (Figure 1, Item 1) until boom
weight is fully supported and upper retaining pin (Figure 1, Item 2) is free.
3.
Remove screw (Figure 1, Item 4), lockwasher (Figure 1, Item 3), and upper retaining pin (Figure 1, Item 2)
from elevating cylinder (Figure 1, Item 12) and boom (Figure 1, Item 1). Discard lockwasher.
WARNING
Elevating cylinder is heavy. Remove with the aid of assistant and a lifting device. Failure to
comply may result in injury or death to personnel.
4.
Remove cotter pin (Figure 1, Item 7), lower retaining pin (Figure 1, Item 8), and elevating cylinder
(Figure
1,
Item
12) from turntable (Figure 1, Item 9). Discard cotter pin.
5.
Using chain (Figure 1, Item 13) and lifting device (Figure 1, Item 14), raise boom (Figure 1, Item 1) and install
crane shipper braces (TM 9-2320-272-10).
TM 9-2320-272-23-4
0693
0693-2


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