Bontrager 231793 Front hubs- Loose ball, Remove the axle, Clean and inspect the parts

Seal not seated

Bearings in bearing cup

Shell shield

Fig. 8A

Fig. 6A

Fig. 7A

Fig. 5A

Front hubs- Loose ball

Bontrager Superstock, Superstock Disc, Select ATB, Select ATB Disc, Select Road, and Select Hybrid front wheels;

plus Bontrager Comp II front hub Recommended tools 13mm cone wrench

17mm cone wrench Small slot screwdriver Hammer (soft faced)

	DISASSEMBLY
	Hub parts and names are referenced on next page.
	Remove the axle
	1. Remove external seals
Fig. 1A
	(Fig. 2A) with a screwdriver. Be
External seal
	careful not to tear or mar the
	rubber.
	2. On one side (either) of the
	hub place a 13mm cone wrench
	on the ball cone. Place a 17mm
	cone wrench on the end nut (Fig.
	3A). Loosen the end nut.
	3. Remove the end nut,
	washer, and ball cone from the
Fig. 2A	axle (Fig. 4A).
	4. Slide the axle, with the
	other end nut, washer, and ball
	cone still attached, out of the
	hub (Fig. 4A).

5. Gently insert a thin screwdriver blade under the shell shield (Fig. 5A) and lift to remove the shield from the hub. Pry off the shell shields from both sides of the hub.

Fig. 3A	6. If inspection
Axle	shows it necessary,
	remove the other end
	nut and ball cone.

End nut

Washer

Ball cone

Fig. 4A

Clean and inspect the parts

1.Use solvent to completely remove all old grease and debris from the hub, axle, and axle parts.

2.Inspect the bearing running surfaces of both the ball cones and the ball cups (inside the hub). Replace any cones. If the cups are worn, replace the hub shell.

Lubricate bearings and threads

1.Lubricate the threads on the axle with Wrench Force™ synthetic grease, or a similar product.

2.Place a bead of grease all the way around each ball cup, sufficient to hold the balls.

ASSEMBLY

1.Place eleven 3/16” balls in the ball cup on one side of the hub.

2.Place the shell shield, with its sharp edges facing out (Fig. 6A), into the hub. The shell shield is a press fit, so must be tapped lightly to fully seat. Lay a cone wrench over the shell shield and

tap the wrench with a hammer (Fig. 7A) to protect the shield and ensure that it is flush with the shell.

3.Repeat Assembly steps 1-2 for the other side of the hub.

4.Tighten the end nut

against the ball cone on the axle. Hold the ball cone with a 13mm cone wrench on the axle flats

while turning the end nut with a 17mm cone wrench.

5.Insert the axle through the hub from either side.

6.Thread the ball cone, wash- er, and end nut onto the axle in that order. The serrated surface of the end nut faces out.

7.Hold the ball cone with a 13mm cone wrench and tighten the end nut with a 17mm cone

wrench.

8.Check the bearing adjust- ment by turning the axle with your fingers. The axle should spin smoothly without binding or feeling gritty. There should be no lateral play of the axle in the hub. Readjust the hub as necessary, and re-lock the end nut.

9.Install the external seals,

and apply grease where the seals contact the hub shell and axle parts. Make sure the seals prop-

erly seal against both the end nut and the hub shell. There should be a smooth transition from seal to sealing surface. An improperly installed seal (Fig. 8A) will allow rapid con- tamination of the bearings.

After completing assembly of the hub, check its function by spinning the axle with your fingers. It should rotate freely without irregular friction. A small amount of lateral play is acceptable if the play is eliminated when the wheel is installed with the quick release properly closed.

2 2003 Bontrager Service Manual