TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 238 of 775

TM 9--2350--311--10

2--140

Change 6

2--11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS

— CONTINUED

2--11.1

M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount — Continued

d. Quick Alinement of M117/M117A2 Panoramic Telescope Using the M140/M140A1 Alinement Device

— Continued

NOTE

Ensure mounting surfaces are clean and free of burrs. If dovetail door wedge has burrs, notify

unit maintenance.

2

Driver slips M140/M140A1 alinement device (28) onto dovetail door wedge (29) in front of panoramic

telescope ballistic cover (30) and secures in position by turning clamping catch (31). Ensure

M140/M140A1 alinement device is securely latched.

2.1

If using ERLS version, depress button (31.1) to activate.

3

To rotate panoramic telescope ballistic cover (30), release brakes using rod end clevis assemblies (32)

inside cab and rotate by holding webbing straps (33).

4

Sighting through M117/M117A2 panoramic telescope (1) eyepiece at M140/M140A1 alinement device

(28), line up apertures as shown. At this setting, M117/M117 panoramic telescope is in close alinement

with cannon tube.

5

Driver should release clamping catch (31) and remove M140/M140A1 alinement device (28) from

dovetail door wedge (29) and hand it to gunner for stowage.