12 Generac®Power Systems, Inc.
Section 3 – Maintenance
PRIMEPACT 55G and 55LP Recreational Vehicle Generators

Figure 3.2 — Engine Oil Filter

3.3 MAINTAINING THE ENGINEAIR CLEANER

3.3.1 CLEANING TH E FOAM PRECLEANER

Clean and re-oil the foam precleaner every three
months or every 25 hours of operation, whichever
occurs first. Service the foam precleaner more fre-
quently if operating the generator in extremely dusty
or dirty conditions. Use the following procedure
(Figure 3.3):
1. Turn the knob counterclockwise to loosen.
2. Remove the cover, foam precleaner and paper fil-
ter.
3. Remove the foam precleaner from the cover.
4. Wash the foam precleaner in liquid detergent and
water.
5. Wrap the foam precleaner in a clean cloth and
gently squeeze it dry.
6. Saturate the foam precleaner in clean engine oil.
Gently squeeze it in a clean cloth to remove
excess oil and to distribute oil (DO NOT TWIST).
7. Install the foam precleaner into the cover, fol-
lowed by the paper filter. Tabs at edges of paper
filter must lock into slots on cover.
8. Install the cover, foam precleaner and paper filter.
9. Replace knob to retain the filter in place.

Figure 3.3 – Engine Air Cleaner

3.4 CLEAN AIR INTAKE SCREEN
Clean all foreign material from the air intake screen
(Figure 3.4) at least once every 100 hours of opera-
tion. Clean more often if necessary.
Inspect the area around the generator exhaust muf-
fler periodically and remove all grass, leaves, dirt,
etc., from this area.

Figure 3.4 – Cleaning Air Intake

3.5 CHECKING THE ENGINE SPARK PLUG
Clean the spark plug and reset the spark plug gap
every 100 hours of operation.
1. Clean the area around the base of the spark plug
to keep dirt and debris out of the engine. Clean by
scraping or washing using a wire brush and com-
mercial solvent. Do not blast the spark plug to
clean.
2. Remove the spark plug and check the condition.
Replace the spark plug if worn or if reuse is ques-
tionable.
3. Check the spark plug gap using a wire feeler
gauge. Adjust the gap to 0.030 inch (0.76 mm)
by carefully bending the ground electrode
(Figure 3.5).

Figure 3.5 – Setting the Spark Plug Gap

Sparking can occur if the wire terminal does
not fit firmly on the spark plug terminal end. If
necessary, re-form the wire terminal to obtain a
tight fit.
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PAPER
FILTER
FOAM
PRE-CLEANER
COVER
KNOB