Introduction; Models Included; Model Numbers; Serial Numbers - Northern Lights NL773LW4 Operator's Manual

Servicing of industrial engines and generator sets
presents unique problems. Generator sets cannot be
compared to the servicing of automobiles, trucks or
even farm equipment. Failures often occur in remote
areas far from competent assistance.
Industrial engines are often taxed far more severely
than auto or truck engines; therefore, maintenance
schedules must be adhered to more strictly.
Failures begin with minor problems that are

MODELS INCLUDED

This manual covers the operating instructions for:
NL773LW4 & NL773LW4E industrial generator sets.
Model numbers give the unit's application, block model, aspiration, and RPM:
NL
NL = Northern Lights industrial
generator set
=
Northern Lights industrial generator set with a
NL773LW4
773 engine and PX-309K2 generator end, Tier IV.
Figure 1: Generator set serial number plate.

Introduction

overlooked 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

Model Numbers

773
Model number of engine block
+
Bore Cylinders
77 mm

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
ONL773LW4 5/21
2
L = long stroke engine
+
W = auxiliary generator set
3
winding
E = Electronic controls
4 = meets US EPA Tier IV
emissions
=
NL773LW4E
an engine number stamped
1
a generator plate, and a generator set plate.
3
L, W, E, 4
Northern Lights industrial
generator set with a 773 engine
and PX-309K2 generator end,
Electronic,Tier IV.
.
Figure 1