TM 5-3820-239-15
Section X. HYDRAULIC BOOM ASSEMBLY
Note. The gland nut and rod wiper
cannot be taken off completely since they
will not fit over the rod fitting.
This section contains repair instructions for
the hydraulic boom assembly. This assembly
(2) U n s c r e w c y l i n d e r h e a d ( 1 4 ) a n d
consists essentially of a boom swing cylinder
slide piston rod assembly (27) with
and a boom lift cylinder, which hydraulically
all parts attached, out of barrel as-
position the boom in response to commands
sembly (28).
(3) Remove lock nut (20) and take all
parts off piston rod assembly (27)
6-65. Removal
from the nut end of the rod.
Remove the hydraulic boom assembly as
(4) Discard all O-rings.
6-66. Disassembly
6-67. Cleaning
a. Hydraulic Boom Assembly. Disassemble
Clean all parts with an approved solvent,
the hydraulic boom assembly in the numerical
and blow dry with compressed air.
b. Boom Swing Cylinder. Disassemble boom
6-68. Inspection and Repair
swing cylinder in the numerical sequence as
a. Inspect all parts for wear and damage.
special procedures:
b. I n s p e c t a l l h a r d w a r e f o r d a m a g e d
(1) Cut the lockwire and remove screws
threads. Retap or rechase threads if stripped
or crossed, or replace if unserviceable.
rod wiper (11).
Note. The gland nut and rod wiper can-
6-69. Reassembly
not be taken off completely since they will
a. Boom Lift Cylinder. Reassemble boom
not fit over the rod fittings.
lift cylinder in reverse of numerical sequence
(2) U n s c r e w c y l i n d e r h e a d ( 1 3 ) a n d
slide piston rod assembly (26) with
b. Boom Swing Cylinder. Reassemble boom
all parts attached, out of barrel as-
swing cylinder in reverse of numerical sequence
sembly (27).
( 3 ) Remove lock nut (19), and take all
parts off piston rod assembly (26)
Note. Install lockwire through screws (11, fig. 6-
from the nut end of the rod.
(4) Discard all O-rings.
c. Hydraulic Boom Assembly. Reassemble
c. Boom Lift Cylinder. Disassemble boom
hydraulic boom assembly in reverse of numeri-
lift cylinder in the numerical sequence as illus-
special procedures.
(1) Cut the lockwire and remove screws
Install the hydraulic boom assembly as
rod wiper (12).