Generac Power Systems 4270-0 - Manual (Page 15)

Section 3 - Maintenance
QUIETPACT" 75D Recreational Vehicle Generator
MAINTENANCE
Figure 3.2 - Engine Air Filter
See the “Service Schedule,” Section 3.13 (Page 16), for
recommended air cleaner maintenance.
3.4 SPARK ARRESTOR MUFFLER
The exhaust muffler supplied with the QUIETPACT™
75D is a spark arrestor type. Generac exhaust muf­
flers for recreational vehicle generators do not have a
spark arrestor screen, but are of the more efficient
“toroid” or “swirl” type. To remove carbon and com­
bustion deposits from the muffler, proceed as follows
(see Figure 3.3):
1. Locate the unit above a non-combustable sur­
face and ensure that the generator exhaust pip­
ing is cool.
2. Remove the two screws holding the spark
arrestor access plate to the rear floor pan.
3. Remove the spark arrestor access plate and gasket.
4.
Remove the hex pipe cap from the end of the
spark arrestor cleanout pipe.
5. Thread on a 3/8” NPT pipe coupling and pipe
nipple to extend the cleanout pipe at least 10
inches (250 mm) below the rear floor pan; addi­
tional piping may be added to direct the muffler
exhaust away from the cooling air discharge flow
beneath the unit.
6. Start and run the engine for approximately 15
minutes.
7. Shut down the engine and allow the piping to
cool.
8. Remove the 3/8” NPT coupling and piping.
9. Apply a graphite-base anti-seize compound to the
cleanout pipe threads.
10. Reinstall the hex pipe cap, spark arrestor access
plate, gasket and two screws.
-A
WARNING
A~
A
The exhaust system of this product gets extreme­
ly hot and remains hot after shutdown. High
grass, weeds, brush, leaves, etc. must remain
clear of the exhaust. Such materials may ignite
and burn from the heat of the exhaust system.
A
------- -ik WARNING ik----------------
Be sure to reinstall the the hex pipe cap tightly to
the spark arrestor cleanout pipe. Vibration could
cause a loose cap to fall out, resulting in hot
engine exhaust being drawn through the centrifu­
gal cooling fan and out beneath the unit. This
could result in damage to the generator or dis­
charge of hot exhaust sparks beneath the unit.
Figure 3.3
-
Spark Arrestor
Muffler Maintenance
3.5 CLEANING THE GENERATOR
Keep your generator as clean and as dry as possi­
ble. Dirt and moisture that accumulate on internal
generator windings have an adverse effect on insu­
lation resistance.
Periodically, clean the generator’s exterior surfaces.
A soft brush may be used to loosen caked-on dirt.
You can use a vacuum system or dry, low pressure
air to remove any accumulations of dirt. The gener­
ator is housed inside an all-weather enclosure;
clean the enclosure with a soft, damp cloth or
sponge and water.
Once each year, have the generator cleaned and
inspected by a Generac Authorized Service Dealer.
Service technicians will use dry, low pressure air to
clean internal windings. Parts inside the control
console should be cleaned and inspected at this
time as well.
Finally, have the insulation resistance of stator and
rotor windings checked. If insulation resistances are
excessively low, the generator may require drying.
-----------ik CAUTION ik--------------------------
Do NOT use a forceful spray of water to clean
the generator. Water will enter the generator
interior and cause problems, and may also
contaminate the generator fuel system.
Generac® Power Systems, Inc. 1 3