Installation of Base Unit -706880627

TM 5-4210-233-14&P-1

4-198. AERIAL LADDER INTERCOM - Continued

(3) Tag and disconnect all wires (5).

(4) Loosen two cable connectors (6). Tag and

remove two cables (7) from intercom.

b. Installation of Base Unit.

(1) Install two cables (7) in intercom and install two

cable connectors (6).

(2) Using tags for identification, splice ail wires (5) with

butt splice connectors (Item 27, Appendix E).

(3) Position cover (3) with gasket (4) on intercom

and install six screws (2) with lockwashers.

(4) Position intercom in control panel cover. Install

two screws with plastic washers from exterior side

of cover. Install two crown nuts (1) and tighten

securely.

Removal of Laddertip Speaker.

(1) Tag two wires (1) and cut wires of butt

splice connectors.

(2) Remove crown nuts (2), hex nuts (3), bolts (4),

lockwashers (5) and bracket (6). Remove

intercom speaker (7) from ladder.

d. Installation of Laddertip Speaker.

(1) Position speaker (7) on ladder and install

bracket (6) across ladder brace with two bolts (4),

lockwashers (5) and hex nuts (3). Tighten

nuts (3) securely.

(2) Install two crown nuts (2) and tighten snugly

against hex nuts (3). Use two wrenches to

lock crown nuts (2) against hex nuts (3).

Turn crown nuts (3) in a clockwise direction

while turning hex nut (2) in a counter-clockwise

direction.

(3) Connect two wires (1) with butt splice

connectors (Item 27, Appendix E).

e. Follow-on Maintenance.

(1) Connect batteries (see para 4-114).

4-498