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Figure 4.1 – Oil Dipstick and Fill
4.2 CHANGING THE ENGINE OIL AND FILTER
4.2.1 Engine Oil Recommendations
Use oil of API Service Class SG, SH or SJ. The
recommended oil grade for the engine is
SAE 15W-40.
NOTE:
The unit is supplied with “break-in” oil. See the
“Service Schedule,” Section 4.12 (Page 19), for
the first required oil change.
Any attempt to crank or start the engine before
it has been properly serviced with the recom-
mended oil may result in an engine failure.
4.2.2 Oil and Filter Change Procedure
To change the oil and filter, proceed as follows:
Refer to the “Service Schedule,” (Section 4.12, Page 19)
for engine oil and filter change frequencies.
Drain the oil while the engine is still warm from run-
ning. This means, warm up the engine, shut it down
and drain it immediately as follows:
1. Remove the oil drain hose from its retaining clip,
located on the generator base frame.
2. Loosen and remove the oil drain hose cap, located
on the base frame end of the hose. Drain the oil
completely into a suitable container.
3. When all of the oil has drained, install and tighten
the oil drain hose cap.
4. Turn the oil filter (Generac part number
0A37970001, Figure 4.2) counterclockwise and
remove it. Properly dispose of the old filter.
Figure 4.2 – Oil Filter
5. Apply a light coating of engine oil to the seal of
new oil filter. Install the filter and tighten by hand
only. DO NOT OVERTIGHTEN.
6. Remove the oil fill cap (Figure 4.1). Add the recom-
mended oil (see Section 4.2.1). DO NOT FILL
ABOVE THE DIPSTICK “FULL” MARK. Crankcase
oil capacity is 4.5 U.S. quarts (4.25 L).
After refilling the crankcase with oil, always
check the oil level on the dipstick. Never
operate the engine with the oil level below the
“Add” mark on the dipstick. Doing this could
damage the engine.
7. Start the engine and check for oil leaks.
8. Check the oil level after checking for leaks to
ensure that the oil is filled to the proper level.
4.3 CHANGING THE ENGINE AIR CLEANER
To replace the engine air cleaner, (Generac part num-
ber 0A4637, simply remove the air cleaner cover and
replace the air filter making sure it is positioned
properly before reattaching the cover. (See Figure
4.3, page 16)
!
OIL FILTER
TO BASE
OIL DRAIN HOSE
!
OIL FILL CAP
OIL DIPSTICK
Section 4 — Maintenance
Guardian Liquid-cooled 40 kW Generator
Generac
®
Power Systems, Inc. 15