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Drive System
Maintenance
Checking the Tire Pressure
Service Interval: Every 50 hours
Check the pressure after every 50 operating hours or monthly,
whichever occurs first (Figure 72).
Maintain the air pressure in the front and rear tires. The
correct air pressure is 124 kPa (18 psi) in the rear tires and
172 kPa (25 psi) in the caster wheels. Uneven tire pressure
can cause an uneven cut. Check the tires when they are cold
to get the most accurate pressure reading.
Figure 72
Replacing the Caster Wheels
and Bearings
1. Obtain a new caster wheel assembly, cone bearings, and
bearing seals from your Authorized Toro Distributor.
2. Remove the locknut from the bolt holding the caster
wheel assembly between the caster fork (Figure 73).
1. Nut
2. Bearing spacer
3. Outer bearing seal
4. Cone bearing
5. Inner bearing seal
3. Grasp the caster wheel, and slide the bolt out of the
fork or pivot arm.
4. Discard the old caster wheel and bearings.
5. Assemble the caster wheel by pushing the cone
bearings and seals, packed with grease, into the wheel
hub, positioned as shown in Figure 73.
6. Slide the spacer into the wheel hub through the
bearings, captivating the spacer inside the wheel hub
with 2 bearing spacers.
Important: Ensure that the seal lips are not
folded inward.
7. Install the caster-wheel assembly between the castor
fork and secure it in place with the bolt and locknut.
8. Tighten the nut until the wheel no longer spins freely,
then back it off just until the wheel spins freely.
9. Attach a grease gun to the grease fitting on the
caster wheel and fill it with No. 2 general-purpose,
lithium-based grease.
52
Figure 73
6. Spacer
7. Caster wheel
8. Axle bolt
9. Caster fork
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