ASSEMBLY AND PREPARATION FOR USE. (cont)

ARMY

TM 9-6650-235-13&P

MARINE CORPS

TM-08552A-13&P

CAUTION

The

Borescope

must

supported to prevent bowing and

resultant damage. Refer to table 2-2,

page 2-16 for the correct number of

supports required.

c. If using the 90-mm thru 8-inch support

assemblies (9), adjust to desired bore size by inserting

into muzzle end of cannon bore and adjusting as stated

in paragraph 2-2b, page 2-2. Then install supports on

objective tube assembly and borescope extension tubes

with support arms (10) facing away from end of tube

where illuminating head assembly attaches.

d. All supports should be installed in areas marked

SUPPORT AREA except for one support, which should

be installed immediately adjacent to illuminating head

assembly. When using more than one borescope

extension tube, alternate the support assemblies on the

support areas. Tighten the three screws (11) in body

(12) to secure supports to tubes.

e. If using 75-mm or 81-mm support assemblies,

install supports in locations noted above and tighten the

three setscrews to secure supports to tubes.

WARNING

The illuminating head assembly

presents a shock hazard if the M3

Borescope is not unplugged during

assembly.

f. Insert the illuminating head assembly (3) on the

end of the objective tube assembly (1) containing the

objective lens optical cell assembly (2). Ensure the

correct lamp (13) is installed.

2-13