Overhauling the front wheel
Wheel bearings
Before checking the dimensions, check for wear on wheel hub bearings. Check for wear by hand after cleaning and degreasing the bearings in their seats.
Turn the inner ring.
Check the amount of radial and axial play. Excessive play will cause vibration and make the bike unstable and these parts will have to be replaced.
To remove the bearings (10) and the sealing rings (11) from the wheel hub follow the instructions below.
Position a drift (A) against the inner ring of the bearing (10).
Tap with a hammer until removing the bearing (10).
Apply the drift at different points to facilitate the removal.
Important
Once removed, the used bearings and sealing rings must not be refitted.
Before fitting new bearings, check that the seat is clean and free from scoring and damage.
Grease the bearing seat and then push the new bearing into its seat.
Using a tubular drift (B) that only bears on the outer ring of the bearing (10) to drive the latter fully into its seat.
Use the same method to install the sealing rings (11).
Ensure that spacer (12) is fitted between the two wheel hub bearings.
Note
Wheels must be rebalanced after repair, maintenance and overhaul operations.
Inspecting the wheel shaft
Check the wheel shaft for straightness.
Turn the shaft on a reference surface and measure maximum distortion using a feeler gauge.
Overhauling the wheel rim
After you have checked the bearings, check the rim as follows.
Visually inspect the rim for cracks, scoring and deformation: change the rim if damaged.
Insert the shaft in the wheel and position it on two fixed reference blocks.
Using a dial gauge, measure rim runout and out-of-round with respect to the shaft axis.
If the values measured are not within the tolerance limits, replace the wheel.