Changing Spark Plugs; Greasing The Tractor - Toro Wheel Horse 520xi Operator's Manual

5. Install the replacement oil filter to the filter adapter.
Turn the oil filter clockwise until the rubber gasket
contacts the filter adapter, then tighten the filter an
additional 1/2 turn (Fig. 29).
6. Fill the crankcase with the correct type of new oil;
refer to Changing Oil, page 23, steps 9 through 11.
7. Dispose of the used oil filter at a certified recycling
center.

Changing Spark Plugs

Change the spark plugs after every 200 operating hours.
Make sure the air gap between the center and side
electrodes is correct before installing the spark plugs. Use
a spark plug wrench for removing and installing the spark
plugs and a gapping tool/feeler gauge to check and adjust
the air gap.
Type: Champion RC-12YC (or equivalent)
Air Gap: 0.030" (0.76 mm)
Removing the Spark Plug
1. Disengage the PTO, set the parking brake, lower the
attachment lift, stop the engine, and remove the
ignition key.
2. Open the hood.
3. Pull the wires off the spark plugs (Fig. 30).
4. Clean around the spark plugs to prevent dirt from
falling into the engine and potentially causing damage.
5. Remove the spark plugs and metal washers.
2
1
Figure 30
1. Spark plug wire
m–3246
2. Spark plug
24
Checking the Spark Plugs
1. Look at the center of the spark plugs (Fig. 31).
If you see light brown or gray on the insulator, the
engine is operating properly. A black coating on the
insulator usually means the air cleaner is dirty.
Important Do not clean the spark plugs. Always
replace a spark plug when it has a black coating, worn
electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Fig. 31) and bend the side electrode, if the gap is not
correct.
2
1
Figure 31
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plugs and metal washers.
2. Ensure that the air gap is set correctly.
3. Tighten the spark plugs to 18 to 22 ft-lb (24.4 to
29.8 Nm).
4. Push the wires onto the spark plugs (Fig. 30).
5. Close the hood.

Greasing the Tractor

Grease the machine after every 50 operating hours or
yearly, whichever occurs first. Grease more frequently
when operating conditions are extremely dusty or sandy.
Grease Type: General-purpose grease.
3
0.030"
(0.76 mm)
m–3215
3. Air gap (not to scale)
s