Servicing The Spark Plugs - Toro TX 420 Operator's Manual

2
3
4
5
Figure 40
1. Road wheel
2. Gasket
3. Bolt
4. Check the grease under the cap and around the gasket
(Fig 40). If it is dirty, gritty, or depleted, clean out all
of the grease, replace the gasket, and add new grease.
5. Ensure that the road wheel turns smoothly on the
bearing. If it is frozen, replace the road wheel as
described in the Road Wheel Kit Installation
Instructions or contact your Authorized Service Dealer
for repair.
6. Place the greased road wheel cap over the bolt head
(Fig 40).
7. Secure the road wheel cap with the snap ring (Fig 40).
8. Repeat steps 3 through 7 for the other road wheels.
9. Install each track guide to the traction unit frame using
the fasteners you removed previously. Torque the bolts
to 67 to 83 ft-lb (91 to 112 N⋅m).
10. Install the tracks; refer to Replacing the Tracks,
page 31.

Servicing the Spark Plugs

Check the spark plugs after every 200 operating hours.
Ensure that the air gap between the center and side
electrodes is correct before installing each spark plug. 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. Install new spark plugs if necessary.
Type: Champion Premium Gold 2071, RC12YC,
or equivalent. Air Gap: 0.030 inch (0.76 mm)
1
6
m–6776
4. Road wheel cap
5. Snap ring
6. Add grease under the cap
Removing the Spark Plug
1. Lower the loader arms, stop the engine, and remove
the key.
2. Open the hood; refer to Opening the Hood, page 24.
3. Pull the wires off of the spark plugs (Fig. 41).
4. Clean around the spark plugs.
5. Remove both spark plugs and metal washers.
2
Figure 41
1. Spark plug wire
Checking the Spark Plugs
1. Look at the center of both spark plugs (Fig. 42). 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 Never clean the spark plugs. Always
replace the spark plugs when they have a black coating,
worn electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Fig. 42).
3. Bend the side electrode (Fig. 42) if the gap is not
correct.
2
1
Figure 42
1. Center electrode insulator
2. Side electrode
33
s
1
m–5922
2. Spark plug
3
0.030 inch
(0.76 mm)
m–3215
3. Air gap (not to scale)