Antenna

TM 32-5985-343-14&P

WARNING

(5) Blocks that support lowered tower with

Do not let elevator assembly go

tower adapter attached must be capable of supporting at

least 2,000 pounds.

beyond its upper limit of travel. Take

extreme care when it approaches this

(6) When hoisting equipment, hoist operator

position. Otherwise excessive cable

shall not be permitted to perform any other work. He

stress could result, and this stress

shall not leave controls until load has been safely

lowered to the ground.

could cause equipment failure or

injury to persons.

(7) Do not let elevator assembly go beyond

its upper limit of travel. Damage to equipment or injury

(5) Raise elevator to top and secure with

to personnel could result. Be very careful as elevator

shear pins and retaining pins. See paragraph 2-17b,

approaches this limit. Have someone at tower top to tell

steps (2) and (3).

elevator hoist operator when elevator reaches upper

(6) Install temporary antenna installation

limit.

platform (paragraph 2-17c) to reduce hazards and other

(8) When elevator is lowered, bottom roller

problems in bolting and unbolting carriage.

assemblies of elevator assembly must be at least 6

(7) Roll carriage onto elevator. To prevent

inches from bottom of lowest track section.

misalignment between elevator and tower tracks that

(9) When antenna is lowered, be sure that

would result from the load on the elevator stretching the

side of antenna that faces tower does not have

elevator cable, briefly operate hoist with UP control.

protruding elements that would interfere with elevator

Secure with six bolts (20), nuts (21), lockwashers (22),

motion.

and square beveled washers (23).

NOTE

(8) Remove antenna installation platform.

When tower is lowered, be sure that

WARNING

cable rides in cable slot at top of gin

When elevator is lowered, bottom

pole. Gin pole will then act as lever.

roller

assemblies

elevator

b. Antenna. Item numbers that follow refer to

assembly must be at least 6 inches

figure 5-6, unless indicated otherwise.

from bottom of lowest track section.

(1) Install elevator assembly.

Refer to

paragraph 2-16d.

(9) Remove shear pins and retaining pins

previously inserted. With elevator hoist, lower elevator.

CAUTION

Before raising or lowering load with

(10) Remove remaining elements that must be

elevator

hoist,

always

operate

removed before antenna can be detached from

elevator. Raise and lower elevator when necessary.

controls momentarily to eliminate all

Use 20-foot ladder and tower leg ladders to reach

slack in cable. Otherwise starting

antenna.

can cause shock load which could

cause damage to hoist or to rigging.

(11) Remove antenna and pedestal from

elevator. Refer to TM 32-5985-201-15.

(2) Test elevator for proper operation.

(12) If elevator is not to be used soon, remove

See paragraph 2-17b.

elevator assembly and carriage. Refer to paragraph 2-

(3) Disconnect transmission lines from

18.

antenna and control cable from positioner.

c. Antenna Carriage Assembly. Refer to figure 5-

CAUTION

When antenna is lowered, be sure

(1) Remove two stop bolts (25), nuts (21),

that side of antenna that faces tower

and lockwashers (22) from horizontal tracks (18) of

does not have protruding elements

elevator assembly.

that would interfere with elevator

(2) Detach carriage assembly (24) from

motion.

elevator assembly (17) by removing six bolts (20), nuts

(21), lockwashers (22), and square beveled washers

(4) The antenna may be lowered with

(23).

elements protruding from the three sides that do not

(3) Have two persons roll carriage assembly

face tower. Detach all elements from side facing tower

(24) off horizontal tracks (18) of elevator assembly and

that would interfere with elevator motion. Refer to TM

disengage roller assemblies (16).

32-5985-201-15. Scaffold winch may be used to lower

antenna elements to ground.

5-13