BLOCKlNG DIODE REPLACEMENT INSTRUCTIONS

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BLOCKING DIODE TEST-cont

TM-5-1940-277-20 Boat Bridge Erection Twin Jet Aluminum Hull MODEL USCSBMK1 (1940-01-105-5728) MODEL USCSBMK2 (1940-01-218-9165) Manual

REPLACE

TM 5-1940-277-20

TM 1940-20/2

3-109. BLOCKlNG DIODE REPLACEMENT INSTRUCTIONS

TOOLS: 1/2 inch Socket with 2 inch extension

Ratchet with 3/8 inch drive

9/32 inch Open End Wrench

1/2 inch Open End Wrench

11 mm Socket

Ratchet

PARTS/MATERIALS: Diode

NI Spray Electrical Sealer

Disconnect batteries. Both sets of batteries must be disconnected during parts

replacement. Severe burns or shock may result.

NOTE

Area between control box and blocking diode is very close. Only tool combination to re-

move diode is 3/8 inch drive ratchet and socket. Any other tool requires removal of con-

trol box.

REMOVE:

Open and secure battery hatch (refer to paragraph 3-154).

Disconnect batteries (refer to paragraph 3-89).

Using 11 mm socket and ratchet remove nuts (1), washers (2) and wires (3) from three terminals.

Using 1/2 inch socket with 2 inch extension, ratchet, 3/8 inch drive and 1/2 inch wrench remove bolts (6), nuts (7)

and washers (8) securing blocking diode to bracket.

Using 9/32 inch wrench loosen bracket clamp nut (4) behind diode until diode can be moved.

Move diode (5) up and out of bracket (9).

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