Onan Motor Generator Maintenance - GMC 1977 motorhome Operating Manual

Test Procedure
1 . Push "test" button. The circuit breaker
should move to the center position which indi-
cates that power to the protected circuit is dis-
continued.
2 . To restore power, push the circuit breaker
to OFF position before resetting circuit breaker .
CAUTION
if
circuit
breaker does not
pop up
when
the
test bvtton
is .
pushed, a toss
of
ground-#au'It
pratertea~i
is ind
eated*ad
o potentially
lethal 0u;rtion
_exists. Do
not use. Have_
served
by
a
qualified
electrition .
ONAN MOTOR GENERATOR
MAINTENANCE
SERVICE INTERVALS
For service intervals refer to the Maintenance
Schedule folder.
CHECKING OIL LEVEL
Check the oil level daily, or at least every
eight hours of operating time. Check more often
on a new unit as oil consumption is generally
higher until piston rings seat properly.
CAUTION
Motor Generator crankcase is pressur-
ized during operation. Do not remove
oil frller cap and dipstick white
unit
is
running .
CHANGING OIL
Initial oil change should be made after the
first 25 hours of operation; change every 100
hours after that. If operating in extremely dusty
or cold weather conditions, change oil more fre-
quently .
The 6KW Model has an oil capacity of 4
quarts; 4 1
/2
quarts if replacing oil filter .
Do not mix brands or grades of motor oil . Use
a good quality oil with the designation SE/CC.
If necessary to add oil between changes, use the
same brand and grade of oil .
Use the following chart as a guide for the
proper oil according to temperature ranges :
9 7
Onan Motor Generator (Right Side View)
TEMPERATURE RECOMMENDED OIL
SAE 30 Above 30°F. (-1.1°C)
0°F (-17.8°C.) to
SAE 5W30 or 1OW40
30°F. (-1 .1°C .)
BelowO°F . (-17.8°C.) SAE 5W30
NOTE : Fill engine with oil through dipstick tube .
The oil drain plug is located on the bottom
side of the engine oil base . Unit must be pulled
out on its slide rail to gain access.
OIL FILTER
Change the crankcase oil filter at least every
200 hours . The filter is located on the right side
of the unit (facing the compartment) . Remove
by turning counterclockwise with a filter wrench .
Before installing new filter, coat the gasket on
the filter's base with a light film of new oil.
Install by turning clockwise until a light friction
is noted, then torn an additional 1 /a to 1
/2
turn.
CAUTION
Do not over-tighten fitter as damage
may occur to rubber gasket which wiR_
cause filter to leak . Be sure-to install-
seating ring -around filters this
ring
is an'
air seal to prevent pooling stir loss .
_
FUEL PUMP FILTER ELEMENT
Every 400 hours drain the fuel pump and
check filter element. Remove fuel pump mount-