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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
Chassis and Lift Platform Systems
A single harness on the main chassis interconnects the instrument panel and
engine package with all other electrical components, lighting, and
accessories. All components installed are of standard automotive type for
easy procurement and replacement. All components that are not weatherproof
are adequately protected from the elements.
A second wiring system interconnects the platform control switches and
lighting and accessories.
Power Distribution and Control Circuits
Power for all vehicle control and lighting circuits is supplied to the engine
from the positive battery cable connection on the engine starter. At
this point, the power circuit is divided into two circuits:
Wire #10 (through 30-ampere fuse, 2FU feeds the instrument panel
keyswitch.
Wire #7 (through a 50-ampere circuit breaker, CB1) feeds the ECU to glow
plugs (diesel engines only).
At the instrument panel, power is fed through the keyswitch to the
"RUN-START" circuits. The keyswitch is a 3-position
conventional anti-restart automotive rotary switch with "OFF-RUN-START"
positions. The "START" position is mechanically interlocked so that the
keyswitch must be turned to "OFF" before the starter may be re-engaged.
Each of these circuits is in turn divided as necessary and all are fused in
accordance to wire size and circuit load.
Engine Start Circuit
The solenoid on the engine starter is energized through a heavy-duty starter
relay, which is then activated by either one of the key switches (in operator's
station or on platform) and interlocked with the transmission neutral switch.
• When SW1 keyswitch is turned to RUN position, power is fed through "R"
contact on line 17 to the run and warning light circuits.
• If either LS-N2 or LS-ST (or both) contacts are closed, and REMOTE switch
is in "RUN" position, power ows through to wire #16 to energize coil of
Remote Lockout relay CR8 and, for diesel engines, the fuel solenoid.
• CR8 contact closes, enabling operation of start circuit.
• When SW1 is turned to "Start", power ows through "S" contact, through
CR8 contact, transmission neutral switch LS-N1 and start protection relay
CRP contact to energize starter relay CR1.
• CR1 contact closes, energizing starter solenoid to operate starter motor.
• When engine is running and alternator starts to generate voltage, relay CRP
coil is energized and contact CRP opens. This prevents any further
operation of starter relay by either ignition switch. Note however, that CRP
coil will not be energized until starter has been disengaged.
SEPTEMBER 01, 2015
Property of American Airlines
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