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TM 5-1940-277-20
TM 1940-20/2
3-52. JUNCTION BOX UNIT 1 REPLACEMENT INSTRUCTIONS
TOOLS: 6 In. Crosstip Screwdriver
1 1/4 In. Open End Wrench
Adjustable Wrench
Nut Driver Set
PARTS/MATERIALS: Junction Box Unit 1
REMOVE
Switch master switch off (refer to paragraph 1-17).
1.
Open access panel under control console. (Refer to paragraph 3-154).
2.
3.
Using crosstip screwdriver, remove four screws (1) that secures junction box unit 1 cover to junction box (2) and
remove cover.
4.
At junction box unit 1 (2), use open end wrench and adjustable wrench to loosen and unscrew cable gland hex
nuts (3) where cable harnesses (4), (5), and power leads + and - (6) enters junction box unit 1 (2).
5.
Tag and remove switch panel unit 1 (7) cable leads (4) and (5) from quick disconnect receptacles (8).
Use nut driver to remove power leads + and - (6) from junction box terminals (9).
6.
7.
Carefully pull switch panel unit 1 (7) cable harnesses and power leads (6) from junction box unit 1 (2).
Use open end wrench and adjustable wrench to loosen end unscrew cable glands (10) where + and - power leads (11)
8.
from switch panel unit 2 (12) enters junction box unit 1 (2).
Use nut driver to remove switch panel unit 2 (12) + and - power leads (11) from junction box terminals (13) then
9.
remove power leads from junction box unit 1 (2).
10.
Label and disconnect three wiring harnesses (14) from quick disconnect receptacles (15).
11.
Use open end wrenches to loosen and remove hex nuts from cable harness glands (14) and tag and remove cable
harnesses (16) from junction box unit 1 (2).
12.
Label and disconnect four power leads (17) from terminals (13) and (9) in junction box unit 1 (2).
Using open end wrench and adjustable wrench to loosen and unscrew gland nut (18) where power leads (17) enters
13.
junction box unit 1 (2).
14.
Carefully remove power leads (17) from junction box unit 1 (2).
Using a boxed end wrench and crosstip screwdriver, remove four nuts (19), washers (20), and screws (21) that se-
15.
cure junction box unit 1 (2) to hinged access panel.
Remove junction box unit 1 (2) from hinged access panel.
16.
3-115


 


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