Maintenance
40 Owner’s Manual for MLT6SM/6SK Light Tower
• Verify the oil is correct for special operating condi-
tions such as a change in season or climate.
• DO NOT start the unit if the engine oil level is
below the ADD mark on the dipstick.
• Normal operating level is in the cross-hatch
pattern between the full and add markings on
the dipstick.
• Add oil only if the oil level is below the add
mark on the bottom of the cross-hatch pattern
on the dipstick. DO NOT OVERFILL the
crankcase.
• Check the fuel level.
• If the unit is connected to a remote start or transfer
switch, verify the remote switch is also off and
tagged.
NOTE: If the engine was run out of fuel or the fuel tank
was drained, it may be necessary to purge the fuel lines.
Refer to the engine operator’s manual supplied with the
unit.
Basic Maintenance Schedule
Refer to the original equipment manufacturer’s operating
manual for a complete list of maintenance requirements.
Failure to comply with the procedures as described in the
engine operator’s manual will nullify the warranty,
decrease performance, and cause equipment damage or
premature equipment failure. Maintenance records may
be required to complete a warranty request.
Use the schedule in the following table as a guide for reg-
ular maintenance intervals. For additional or replacement
copies of the engine operator’s manual, contact a GMP
ASD.
* Generac Mobile Products, LLC recommends that oil change intervals on the MLT6SM equipped with the Mitsubishi
L3E-W461ML Tier 4 engine be extended to 750 hours after initial break-in. The engine comes from the factory with
a larger sump that holds 5.5 qts (5.2 L) of engine oil. After the initial 50 hour break-in and oil change, the sump,
coupled with the larger oil filter, allows the engine to operate up to 750 hours between routine oil changes. Hot,
humid, or dusty conditions can shorten engine oil service life, regardless of suggested oil change intervals. Always
follow the recommendations of the OEM engine manual that was shipped with the unit for specific operating
instructions. If further technical assistance is required, contact Generac Mobile Products Technical Service at
1-800-926-9768.
Table 4-1. Basic Maintenance Schedule—MLT6SM (Mitsubishi)
Item Daily
First
50
Hours
Every
750
Hours
As
Required
Check oil level
Check coolant level
Check fuel level
Check tire pressure
Inspect wheel bearings
Inspect all electrical connections
Inspect radiator fins for debris; clean as required
Inspect light tower winch for proper operation
Replace engine oil and oil filter
*
Inspect and adjust belt and belt tension
*
Replace fuel filter
Inspect battery condition
Replace air cleaner element
Lubricate leveling jacks
Purge air from fuel system
Drain residual water from fuel filter
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