7. W hen oil has drained completely , close the
drain v alv e .
8. R emo v e the drain hose ( Figure 26 ).
Note: Dispose of the used oil at a recycling
center .
9. Chang e the oil filter , if necessar y ( Figure 27 ).
10. Clean around the oil dipstic k and unscrew the
cap ( Figure 24 ).
11. Slo wly pour appro ximately 80% of the
specified oil into the filler tube ( Figure 24 ).
12. Chec k the oil lev el; refer to Chec king the Oil
Lev el in Engine Maintenance , pag e 23 .
13. Slo wly add additional oil to bring it to the full
mark.
Changing the Oil Filter (For Model
74420 only)
R e place the oil filter ev er y 100 hours or ev er y
other oil c hang e .
Note: Chang e the oil filter more often in dusty ,
dir ty conditions .
1. Drain the oil from the engine; refer to Changing
and Draining the Oil in Engine Maintenance ,
pag e 23 .
2. R emo v e the old filter and wipe the filter
adapter g ask et surface ( Figure 27 ).
3. Apply a thin coat of clean oil to the r ubber
g ask et on the re placement filter ( Figure 27 ).
Figure 27
1. Oil lter 3. Adapter
2. Gasket
4. Install the re placement oil filter to the filter
adapter . T ur n the oil filter cloc kwise until the
r ubber g ask et contacts the filter adapter; then
tighten the filter an additional 1/2 to 3/4 tur n
( Figure 27 ).
5. Fill the crankcase with the proper type of new
oil; refer to Changing and Draining the Oil in
Engine Maintenance , pag e 23 .
Servicing the Spark Plug
R e place the spark plug after ev er y 100 operating
hours . Mak e sure that the air g ap betw een the
center and side electrodes is cor rect before
installing the spark plug . Use a spark plug wrenc h
for remo ving and installing the spark plug(s) and a
g apping tool/feeler g aug e to c hec k and adjust the
air g ap . Install a new spark plug if necessar y .
T ype: Champion R C12Y C (or equi v alent)
Air Gap: 0.030 inc h (0.76 mm)
Removing the Spark Plug
1. Diseng ag e the blade control switc h, mo v e the
motion controls outw ard to the park position,
stop the engine , and remo v e the k ey .
2. Pull the wire off of the spark plug ( Figure 28 ).
Clean around the spark plug to prev ent dir t
from falling into the engine and potentially
causing damag e .
3. R emo v e the spark plug and metal w asher .
Figure 28
1. Spark plug 2. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug ( Figure 29 ).
If y ou see light bro wn or g ra y on the insulator ,
the engine is operating properly . A blac k
coating on the insulator usually means the air
cleaner is dir ty .
26
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