PAGE 2.1 - 12 OPERATION MARK IV HD J2 TAMPER
REVISED 10 - 2020 CONTROLS BULLETIN 5082505
2.1
2.1.2 Controls - Exterior
(7) Batteries - See Figure 2.1-5
The Batteries are located inside of the Battery Compartment on the left side of the machine.
Important: Two 12 volt batteries are connected in series to provide a 24 volt electrical system.
(8) Master Disconnect Switch - See Figure 2.1-5
The Master Disconnect Switch is located inside of the Battery Compartment on the left side of
the machine. To turn on the machine's electrical system, rotate the switch clockwise to the On
position. To shut off the machine's electrical system, rotate the switch counter-clockwise to the
Off position.
a. Important: Never turn the Master Disconnect Switch OFF when the engine is
running. The voltage regulator, alternator, and/or other electrical system components
could be damaged.
b. The Strobe Light located on the top of the cab roof will turn on or off with the Master
Disconnect Switch.
(9) - DEF Purge Cycle Indicator - Earlier Models Only - See Figure 2.1-5
The Diesel Exhaust Fluid (DEF) Purge Cycle Indicator is located inside of the Battery
Compartment on the left side of the machine. When the engine is shutdown, the Purge Cycle
will operate for approximately two (2) minutes to clear the DEF line (as it is susceptible to
freezing) and to ensure proper storage of the engine Electronic Control Module (ECM) power-
down information. After the Purge Cycle is completed, the engine ECM will shutdown. The
Purge Cycle Indicator will illuminate during the Purge Cycle and shut off after the Purge Cycle is
completed.
a. Important: DO NOT shut off the Master Disconnect Switch when the Purge Cycle
Indicator is illuminated.
The DEF Purge Cycle Indicator was removed on later models and is no longer present. The
engine Electronic Control Module (ECM) is wired such that power is supplied to the ECM
regardless of the Master Disconnect Switch position.
(10) Air Coupler Option - See Figure 2.1-6
The Air Coupler is located on the left side of the machine next to the left front wheel. The air
coupler can be used to operate air tools and other air equipment, or to pressurize the air system
to release the brake actuators on the machine or towing.
(11) Air System Vent / Drain Cable - See Figure 2.1-6
The air system vent / drain cable is used to depressurize the air system and/or to drain the
reservoir of moisture. Pull and hold the cable until all pressure has escaped or until all moisture
has drained. Release the cable to re-pressurize the air system.
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