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Maintenance and Service Instructions
collar so that it rotates in the opposite
direction the wheel would normally turn. If
bearings are rusted in place they will have to
be replaced along with the wheel and shaft.
8. Install bearings and sprocket loosely onto the
shaft. Models 424 & 530A: hub side away
from wheels. Model 742 has 3 bearings.
Wheel bearings should have hubs facing
away from wheel. Wheel shaft bearing
should have hub facing away from sprocket.
9. Bolt bearings into place.
10. Center the wheels between the wheel
opening and the housing. Lock the collars in
place and tighten set screws.
11. Align and tighten the sprocket (there are
double set screws stacked two in each hole)
use blue loctite with the key in place.
12. Replace the chain following procedures in
section "Chain Removal and Replacement.(see
page 17).
13. Adjust chain per section "Adjusting Chain
Tension" and replace drive guard. (see page
18).
Rear Wheel Removal and Replacement:
Models 424 & 530A
1. Make sure unit is on level ground and engine
is turned off.
2. Lower the rear wheel control handle to let the
aerator rest on the tines.
3. Turn the rear wheel depth/stability control
knob to adjust the rear wheels for minimum
depth clockwise (more stability).
4. Remove the axle nut. Pull the axle bolt, then
the wheel from the wheel carriage.
5. Install a new wheel with grease fitting facing
out, with seals carefully in place on the wheel
bushing.Insert axle bolt through wheel and
wheel lift frame. Use washer and lock nut,
tighten firmly.
6. Grease wheel bearings.
Rear Wheel Removal and Replacement:
Model 742
1. Make sure unit is on level ground and the
engine is shut off.
2. Lower the rear wheel control handle to let the
aerator rest on the tines.
3. Turn the rear wheel depth/stability control
knob to adjust the rear wheels for minimum
depth clockwise for more stability.
4. Remove the hairpin cotter pin. (see Figure 16)
5. Slide the wheel assembly off the machine.
(see Figure 16)
6. Install hairpin cotter pin into the axle when
removed to prevent loss.
Removable Wheel - Model 742 Only
Figure 16
TINE AND TINE SHAFT
Tine Replacement
1. Turn off engine and remove weights.
2. Fold handle on the 424 and 530A Models.
3. Place on workbench (Model 424 only) and
chock wheels.
3. Note direction of tine bolt. Reinstall the bolt
facing in the same direction on the Model
424 to avoid contact with weights.
4. Remove and replace tines by loosening stop
bolt. Remove retaining bolt and old tine, insert
new tine and fasten with retaining bolt in the
same direction as it was removed. When all
tines are replaced, tighten stop bolts.
NOTE: Replace worn lock nuts to insure that
bolts will hold tines in place.
Tine Shaft Bearing Removal and
Replacement
1. Turn off engine and remove weights.
2. Remove drive guard cover.
3. Fold handle for better access to tines (on
Models 424 & 530A only).
4. Elevate approximately 4", block and chock
rear wheels.
5. Manually cycle the drive chain for acess to
master link.
6. Turn chain idler adjustment screw counter
clockwise to loosen the chain.
7. Remove the master link and free rotor
sprocket.
19
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