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TM 5-4930-233-14
TM 4930-14/1
Table 2-1. OPERATOR'S CONTROLS - CONTINUED
CONTROL OR
KEY
INDICATOR
FUNCTION
25
JACK CRANKING HANDLE
Extends or retracts jack.
26
AIR TANK DRAIN
Drains moisture and air pressure from air brake
system.
27
AIR BRAKE COUPLERS
Connects trailer air brake system to that of the
towing vehicle.
28
ELECTRICAL CONNECTORS
Connects trailer electrical system
24 VOLT AND 12 VOLT
to the towing vehicle.
29
SAFETY CHAINS
Provides a safety factor when the trailer is
attached to the towing vehicle.
30
PARKING BRAKE AIR
Protects parking brake system
SUPPLY VALVE
from excessive pressure build up.
2-6
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