Onan MJA Series Service Manual page 3

1
INTRODUCTION
Tbis manual contains information for proper maintenance,
servicing and overhaul of MJA, MJB, and MJC series
electric generating plants.
It
doesn't include installation
and operation instructions. Unless otherwise stated, these
instructions apply to all standard plants of the MJA, MJB,
and MJC series. Some details may not apply to special
models with modification specified by the purchaser. How­
i.
ever, by using the instructions and recommendations given
in tbis manual as a general guide" the MJA, MJB, or MJC
generating plant can be properly maintained and repaired.
You will, of course, be using
tbis
manual primarily for
reference when servicing MJA, MJB, and MJe generat­
ing plants.
Tbis
is what it was designed for. But, inaddi­
tion, ONAN recommends that you study the whole manual.
It
will help to acquaint you with the plants you'll be work­
ing on and save time later on in servicing.
,If
possible, use a parts catalog with the service man:ual.
The parts catalog will give you a good picture of assembly
and disassembly and help identify plant components. Since
the fir st and most important part of repair work is correct
diagnosis of the trouble, trouble-shooting charts are in­
cludedtbroughout
tbis
manual to aid diagnosis. Because of
the variety of engines, generators, and controls discussed
in tbis manual, some sections don't apply to all models.
If
. a section or paraf'.'aph applies only to certain models, tbis
is statedat the
bf
j.nningof the section. Check tbis before
beginning repair ­
)
Throughout
./
this manual, the flywheel en4 of the engine will
be called the "Front" and the fuelpump'side designated the
"Left Side" .