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CHAPTER 1 GENERAL INFORMATION AND OPERATING INSTRUCTIONS
NMC-WOLLARD
2021 Truax Blvd. Eau Claire, WI 54703 ● P: 715-835-3151● F: 715-835-6625 ● www.nmc-wollard.com
TML-704H Maintenance Lift Manual No. 310547
1 DESCRIPTION
• For operation from REMOTE switch on platform, keyswitch SW1 on
instrument panel must rst be in "RUN" position. Power then ows as
described above through REMOTE switch to energize fuel solenoid.
• When REMOTE switch is positioned to "START", CR8 contact closes and
applies power to wire #12, owing through LS-N1 and CRP contact to starter
relay.
Engine Run Circuit
The diesel engine is controlled by a solenoid-operated fuel pump and
gasoline engines are controlled by an ignition coil/distributor system. The fuel
shutdown solenoid on a diesel engine is an integral part of the engine.
• As described in Start Circuit operation above, the fuel solenoid is
energized if:
SW1 is in "RUN" or "START" position.
LS-N2 or LS-ST contacts are closed (i.e. gearshift is in neutral or stabilizers
are retracted).
REMOTE switch is in "RUN" or "START" position.
• If stabilizers are lowered while engine is in gear, or if an attempt is made
to put transmission in gear while stabilizers are not fully retracted, the fuel
solenoid will be de-energized, and the engine will stop. "Retract
Stabilizers" indicator lamp PL7 on instrument panel will be illuminated at
this time.
• If the REMOTE switch is turned o, the fuel solenoid will be de-energized,
stopping the engine. At the same time, remote lockout relay CR8 will be
de-energized, and CR8 contact will open to disable engine starter by
instrument panel keyswitch SW1. "Remote Switch O" indicator lamp
PL8 on instrument panel will be illuminated at this time.
Battery Recharging and Monitoring System
The battery is recharged by an engine-driven alternator/regulator system. A
red indicator light ("Low Volts") on the instrument panel warns of an alternator
system malfunction, and a 33-ohm resistor across the light provides start-up
current to the alternator.
Power is fed to the "Low Volts" light through SW1 contact when the key
switch is in the "Run" or "Start" position. Initially, with the engine stopped,
current ows through the bypass resistor RES 1, the light PL1, and the diode
(rectier) REC 1 into the alternator eld. This provides the initial excitation
to the alternator when the engine rst starts. With the engine running, the
alternator quickly builds up its own voltage and feeds the eld internally.
The voltage on the eld terminal then rises to system voltage, current stops
owing through the light and resistor, and the light extinguishes.
SEPTEMBER 01, 2015
Property of American Airlines
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