Figure 22
3. Install a new air filter and the air filter cover.
Changing the Engine Oil
Service Interval: After the first 5 hours—Change the
engine oil.
Every 50 hours—Change the engine
oil.
Run the engine a few minutes before changing the oil
to warm it. Warm oil flows better and carries more
contaminants.
1. Perform the pre-maintenance procedures; refer to
Preparing for Maintenance.
2. Remove the dipstick (Figure 6).
3. Tip the mower onto its side, with the air filter up,
to drain the used oil out through the oil fill tube
(Figure 23).
Figure 23
4. Slowly pour oil into the oil fill tube until the oil
level reaches the Full line on the dipstick (Figure 6).
Do not overfill. (Max. fill: 0.59 l, type: SAE 30W
detergent oil with an API service classification of SF,
SG, SH, SJ, SL, or higher.)
5. Install the dipstick securely.
6. Dispose of the used oil properly at a local recycling
center.
Charging the Battery
Service Interval: Every 25 hours—Charge the battery
for 24 hours (model 20638 only).
Model 20638 only
Always use the charger in a sheltered area and charge the
battery at room temperature (22° C) whenever possible.
1. Connect the charger to the mower wire harness
located below the ignition key (Figure 24).
2. Plug the charger into a wall outlet.
Note: When the battery no longer holds a charge,
recycle or dispose of the lead-acid battery according
to local codes.
Replacing the Fuse
Model 20638 only
If the battery does not charge or the engine does not run
with the electric starter, the fuse may be blown. Replace
it with a 40-amp plug-in type fuse. Refer to Installing
the Fuse.
12
Figure 24