Generac Power Systems MAGNUM MMG75D User Manual

Maintenance
38 MMG75D-100D Operating Manual 33701 C
• Verify the oil level daily. See the engine operator’s manual for the proper viscosity grade of oil, including
special operating conditions 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.
• Verify the fuel level.
• If the unit is connected to a remote start or transfer switch, make sure 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 bleed the fuel lines. See
the engine operator’s manual supplied with the unit for more information.
BASIC MAINTENANCE SCHEDULE
See the original equipment manufacturer’s operating manual for a complete list of mainte-
nance requirements. Failure to comply with the procedures as described in the engine
operator 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 regular maintenance intervals.
Table 4: Basic Maintenance Schedule
Item Daily
100
Hrs.
(Break-
In
Period
Only)
Every
250
Hrs.
Every
500
Hrs./12
Month
s
Every
1000
Hrs.
Every
3000
Hrs./36
Months
As
Require
d
Check Oil Level 
Check Coolant Level 
Check Fuel Level 
Check Tire Pressure 
Check All Electrical Connections 
Inspect Radiator Fins For Debris, Clean As
Required

Check Fuel Filter/Water Separator Bowl 
Check Air Cleaner Filter Minder Gauge *
Perform Visual Walkaround Inspection 
Check Oil Vapor Recirculation System/Non-
Return Valve

Change Engine Oil and Replace Oil Filter **
Replace Oil Vapor Recirculation Filter 
Service Battery 
Replace Fuel Filter Elements 
Check Engine Mounts 
Check Air Intake Hoses, Connections, and
System

Check Engine Electrical Ground Connection 

Generac Power Systems MAGNUM MMG75D Specifications

General

Brand	Generac Power Systems
Model	MAGNUM MMG75D
Category	Portable Generator
Language	English