OM2049 2/13 Safety - Section 20
Page 20-5
PRECAUTIONS FOR MAINTENANCE
BEFORE PERFORMING MAINTENANCE
Stopping The Engine Before Service
• Before performing inspections or maintenance,
stop the machine on firm, flat ground. Lower the
dump body, place the directional control lever to
the PARK position (this will apply the parking
brake), and turn the key switch to the OFF
position and wait for the engine to stop.
• Wait two minutes after the engine has stopped,
and if no warning lights illuminate, then turn the
battery disconnect switches to the OFF position.
Verify that the disconnects are functioning.
• Place wheel chocks around the wheels to
prevent the truck from rolling.
• If the engine must be operated during
maintenance, always move the directional control
lever to the PARK position (this will apply the
parking brake). Always perform this work with two
people. One person must be in the operator's
seat to stop the engine if necessary. Never move
any controls not related to the task at hand during
these situations. Apply the propel lockout lever
(5, Figure 20-2) to prevent the truck from moving
if the engine must operate during maintenance.
When the propel lockout lever is in the OFF
position and LED light (8) is illuminated, the drive
system is locked out and the truck will not propel.
When the propel lockout lever is in the ON
position and LED light (7) is illuminated, the drive
system is active and the truck can be driven.
• When servicing the machine, use care not to
touch any moving parts. Never wear loose
clothing.
• When performing service with the dump body
raised, always place the dump lever in the HOLD
position, and apply the lock (if equipped). Install
the body-up safety cable securely.
Electrical Systems Isolation
• Isolation box (6, Figure 20-2) contains master
disconnect switch (3), starter disconnect switch
(4) and propel lockout lever (5). The isolation box
is located on top of the front bumper, on the left
hand side. Move both disconnect switches and
the propel lockout lever to the OFF position to
disable the 24VDC electrical system, starters and
the AC electric drive system. When the switches
and propel lockout lever are in the OFF position,
LED lights (8) will be illuminated. The battery
disconnect switches and propel lockout lever can
be padlocked in the OFF position to prevent
unauthorized truck operation. When the switches
and the propel lockout lever are in the ON
position, LED lights (7) will be illuminated. Refer
to the following table to ensure the correct
disconnect is used to isolate a desired circuit or
system.
NOTE: This is the recommended usage of the
battery disconnect and propel lockout switches.
Local regulations may be different.
Action Recommended
Isolation
24V Electrical
Troubleshooting
Starter Lockout
24V Electrical
Maintenance/Repair
Master Lockout
High Voltage/Propulsion
Troubleshooting
None
High Voltage
Maintenance/Repair
Master Lockout
Hydraulic Troubleshooting Propel Lockout
Hydraulic
Maintenance/Repair
Starter Lockout
Engine Troubleshooting Propel Lockout
Engine Repair Master Lockout
Mechanical Repair Starter Lockout
Weld Repair Master Lockout &
Alternator Isolation
Fueling Starter Lockout
Lube/General Maintenance Starter Lockout
Shift Change Walk Around Starter Lockout
Oil Sample Collection Propel Lockout
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