8
TREK SERVICE INFORMATION August 2016
To Install The Bearings And Fork
1.
Apply a light coat of grease to the bearing contact surfaces of the frame and fork, and
steering axle.
2. With your hands, align the upper bearing and press it into the frame (Figure 6.2).
3. Align the lower bearing with the fork crown (Figure 6.3).
4. Apply a light coat of grease to the external threads of the steering axle and insert it
into the fork: hold the lower bearing and fork against the bottom of the head tube while
you pass the steering axle through the upper bearing, then the lower bearing, and then
thread the steering axle into the fork.
Note: Be careful not to mar the paint; don’t bump the fork against the frame during
insertion.
Figure 6.5. Steering lock bolt passes through lock washer
and into steering axle
5. Tighten the steering axle to 2 Nm (Figure 6.4).
Check that the fork rotates freely without any end play. Adjust with the steering axle
tension as necessary.
6. From under the fork crown, place the lock washer over the steering axle and thread the
steering axle lock bolt into the bottom of the steering axle (Figure 6.5). With an 8 mm
hex wrench, hold the top of the steering axle to prevent spinning while you tighten the
steering axle lock bolt to 6 Nm..
The steering lock bolt centers the steering axle, and when tightened locks the head
bearings adjustment.
Figure 6.3. Lower head bearing on fork crown
Figure 6.4. Steering axle passes through both bearings,
then threads into fork crown
Figure 6.2. Upper head bearing pressed into frame
