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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 placed in the
HIGH position to perform this
test.
(1)
Place positive (+) probe of multimeter on wire
no 1154B at right ENGINE SPEED CONTROL
switch.
(2)
Place negative (-) probe of multimeter on
ground and look for 22-28 volts on multimeter.
(3)
Replace right ENGINE SPEED CONTROL
switch (para 7-92) if no voltage is measured.
HIGH IDLE SWITCH RELAY TEST
NOTE
Engine must be running, PTO
control switch placed in the on
position, and engine speed
control switches placed in the
HIGH position to perform this test.
(1)
Place positive (+) probe of multimeter on wire no
1590 at HI IDLE SWITCH relay.
(2)
Place negative (-) probe of multimeter on ground
and look for 22-28 volts on multimeter.
(3)
Replace HI IDLE SWITCH relay (para 7-27) if no
voltage is measured.
CONTINUITY TEST
(1)
Disconnect wiring from components at each
end of wire.
(2)
Set multimeter to ohms position.
NOTE
Check wire no 1590 from HI IDLE
A reading of infinity
SWITCH relay to DDEC HI IDLE relay
indicates an open circuit.
for loose connections or damage.
(3)
Connect multimeter leads to each end of
wire and check multimeter for continuity.
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.
2-967
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