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TM 9-2320-360-20-1
WARNING
· Batteries must be disconnected before tightening any connections. Failure to
comply may result in injury to personnel.
· Jewelry can catch on equipment and cause injury or short across electrical
circuit and cause severe burns or electrical shock. Remove rings, bracelets,
watches, necklaces, and any other jewelry before working around HET Tractor.
ENGINE SPEED CONTROL SWITCH
TEST
NOTE
Engine must be running, PTO
control switch placed in the on
position, and engine speed
control switches in the HIGH
position to perform this test.
(1)
Place positive (+) probe of multimeter on wire
no 1154A at left ENGINE SPEED CONTROL
switch.
(2)
Place negative (-) probe of multimeter on
ground and look for 22-28 volts on multimeter.
(3)
Replace left ENGINE SPEED CONTROL
switch (para 7-92) if no voltage is measured.
Check wire no 1154A from left
ENGINE SPEED CONTROL
switch to HI IDLE SWITCH relay
for loose connections, damage,
and continuity test.
CONTINUITY TEST
(1)
Disconnect wiring from components at
Check wire no 1154B from right ENGINE SPEED CONTROL
each end of wire.
switch to HI IDLE SWITCH relay for loose connections,
(2) Set multimeter to ohms position.
damage, and continuity.
NOTE
A reading of infinity
indicates an open circuit
(3)
Connect multimeter leads to each end of
wire.
NOTE
A reading of other than
infinity indicates a
grounded wire.
(4)
Remove multimeter lead from one end of
wire and connect to chassis ground.
2-965
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