Adjusting Chain Tension; Inspection; Adjustment; Wheels - Bluebird B742 Operator's & Parts Manual

Maintenance and Service Instructions
Figure 14

Adjusting Chain Tension

1. Turn engine off.
2. Remove drive guard, loosen lock nut on idler
adjustment bolt.
3. Turn idler adjustment bolt to adjust tension to
allow 1/8" to 1/4" movement at the center
point between the wheel sprocket and the
rotor sprocket (see Figures 14 and 15).
4. Tighten lock nut.
NOTE: BlueBird recommends the replacement
of sprockets when replacing drive chain.
Figure 15
HANDLE - MODEL 424 and 530A ONLY

Inspection

1. The handle cam lock must lock shut under
moderately heavy hand pressure. Handle
frame should be tightly secured to the aerator
body.
2. Check the cam rod lock nut. If it turns freely by
hand when cam is released, the locking
strength of the nut has been relieved and the
nut must be replaced to maintain the security
of the Iock.

Adjustment

With the handle in the operating position, slowly
tighten the cam rod lock nut (1/4 turn at a time)
until the cam handle locks with moderately heavy
hand pressure.
IMPORTANT: excessive adjustment of the lock
nut will damage the cam rod. ALWAYS replace a
free spinning nut to avoid unwanted loosening of
the handle. For smooth operation of the cam,
apply a small amount of grease on the cam edge.

WHEELS

1. Turn off engine and empty all fuel from the fuel
tank.
2. Remove weights and drive guard.
3. Loosen the Iock nut on adjustment screw to
Ioosen the chain. Remove master link and
chain.
4. Tip the front end up to let the aerator rest on its
handle. The front wheel will be approximately 1
foot off the ground.
Secure handle to prevent aerator from
tipping.
5. Remove the wheel shaft bearing bolts (4 on the
424 and 530A and 6 on the 742).
6. Remove the wheel axle assembly.

Drive Wheel Shaft Removal and Replacement

7. Pull sprocket and bearing from shaft. NOTE:
Sprocket is double set screwed. To remove
the bearings, you must first remove the collar
by loosening the set screw, then insert pin
punch into the hole next to the set screw and,
using a hammer, with moderate striking, hit
18
CAUTION!