TM 5-3820-239-15
Section IX. POWER GUIDE EXTENSION MOUNTING
parts (25 through 29) from the cyl-
6-57. General
inder head.
This section contains repair instructions for
(5) Discard all O-rings.
the power guide extension mounting. This as-
sembly contains a hydraulic cylinder which
6-60. Cleaning
moves the drill guide up and down in response
Clean all parts with an approved solvent,
to commands from the hydraulic valve assem-
and blow dry with compressed air.
bly (fig. 1-5).
6-58. Removal
6-61. Inspection and Repair
Remove the power guide extension mount-
a. Inspect all parts for wear and damage.
ing as described in paragraph 5-13a.
b. Inspect all hardware for damaged
threads. Retap or rechase threads if stripped
6-59. Disassembly
or crossed, or replace if unserviceable.
a. Power Guide Extension Mounting. Disas-
6-62. Reassembly
semble the power guide extension mounting
a. Drill Guide Extension Cylinder. Reas-
in the numerical sequence as illustrated on
semble drill guide extension cylinder in re-
verse of numerical sequence as illustrated on
b. Drill Guide Extension Cylinder. Disas-
semble drill guide extension cylinder in the
piston rod assembly (23, fig. 6-23), insert lock
numerical sequence as illustrated on figure
pin (16) so that equal lengths project from
6-23. Note the following special procedures:
both sides of the rod, and flare over the ends
(1) Pry snap ring (24, fig. 6-23) out of
of the pin to retain it in position.
the groove in cylinder head (30).
(2) Using a suitable spanner wrench, un-
b. Power Guide Extension Mounting. Reas-
screw cylinder head (30), and slide
semble power guide extension mounting in re-
piston rod assembly (23) with all
verse of numerical sequence as illustrated on
parts attached, out of barrel assem-
bly (32).
until ready to install the assembly on the drill
(3) Straighten or cut lock pin (16), and
guide.
take all parts off piston rod assembly
6-63. Installation
(23) from the pin end of the rod.
(4) After sliding cylinder head (30) off
Install the power guide extension mounting
piston rod assembly (23), remove the
as described in paragraph 5-13b.
