Introduction; Models Included; Unit Identification; Serial Numbers - Northern Lights M773LW3 Operator's Manual

Servicing of marine engines and generator sets
presents unique problems. In many cases boats
cannot be moved to a repair facility. Marine engines
cannot be compared to the servicing of automobiles,
trucks or even farm equipment. Failures often occur
in remote areas far from competent assistance.
Marine engines are taxed far more severely than
auto or truck engines; therefore, maintenance sched-
ules must be adhered to more strictly.

MODELS INCLUDED

This manual covers the operating instructions for:
M773LW3 and M77LW3G marine generator
unit'application, block model, aspiration, and RPM:
Model numbers give the unit's application, block model, aspiration, and RPM
M
M - Northern Lights marine
generator set
Northern Lights marine generator set with a 773 engine, PX-309K2 generator end, AVR, US EPA Tier III.
=
M773LW3
M773LW3G =
Northern Lights marine diesel generator set with a 773 engine, PX-309K2 generator end, GEM series,
US EPA Tier III.
Updated 7-6-18

Introduction

Failures begin with minor problems that are over-
looked and become amplified when not corrected
during routine maintenance.
As operator, it is your obligation to learn about your
equipment and its proper maintenance. This is not a
comprehensive technical service manual. Nor will it
make the reader into an expert mechanic. Its aim is
to aid you in maintaining your unit properly.

Unit Identification

773
Model number of engine block
+
Bore Cylinders
77 mm 3

Serial Numbers

Your set has three serial numbers:
on the block,
2
Use the serial number on the generator set plate when ordering parts
or in correspondence. The generator set plate is found on the service
side of the generator and resembles the drawing in
OM773LW3 11/20
2
setsthe
L, W, G, 3
L - Long stroke
+
W - Auxiliary Winding in Generator
End
G - GEM series base frame
3 - US EPA Tier III compliant
an engine number stamped
1
a generator plate, and a generator set plate.
3
.
Figure 1