J&M 375ST - Manual (Page 19)

16
2.0 Service 2.0 Service
2.5 Wheel Bearings
The wheel bearings need to be cleaned, inspected, and repacked every 12 months or 12,000 miles. Use a number
2 wheel bearing grease to repack the bearings.
Bearing Inspection and Service:
1. Jack up Speed Tender.
2. Remove wheel lug-nuts.
3. Remove wheel from hub.
4. Remove grease cap.
NOTE: Be careful not to dent or cut a hole in grease cap.
5. Remove the cotter pin, nut, and washer.
6. Wiggle the hub to take the outer wheel bearing out.
7. Pull hub assembly straight off the axle. If you want to reuse the grease seal, (which is not recommended),
be careful to support the weight of the hub so that the end of the axle does not ruin the rubber part of the
grease seal.
8. To remove the inner bearing, you must remove the grease seal.
9. Remove inner bearing.
10. Wash all grease and oil from the bearing cone using a suitable solvent. Dry the bearing with a clean, lint-
free cloth and inspect each roller completely. If any pitting, scalding, or corrosion is present, then
the bearing must be replaced. The bearing cups inside the hub must be inspected.
NOTE: Bearings must always be replaced in sets of a cone and a cup (See bearing cup replacement
on following page.)
11. Repack inner bearing with new grease.
A. Place a moderate amount of grease in the palm of one hand.
B. Hold the inner bearing, large side down, in your other hand
C. Using the edge of the bearing like an ice-cream scoop, work it in until you see fresh grease
come out of the top side of the bearing.
D. Rotate 1/8 of a turn and repeat until the whole bearing is full of fresh grease.
12. Place the inner bearing in the back of the wheel hub and add a liberal dose of grease.
13. Position the new wheel seal in its recess and lightly set it with a hammer.
NOTE: Be careful to not deform the metal part of the seal.
14. Slide the hub assembly onto the spindle and push it back into position.
15. Grease the outer bearings by hand. (See step 11)
16. Slide it and the spindle washer onto the spindle and into the hub recess.
17. Install and bottom out the spindle nut, then back it off 1/4 turn.
18. Reinstall the spindle nut and replace the cotter pin with a new one.
NOTE: If the castle nut does not line up with the hole in the spindle, then loosen the nut
slightly until it does.
19. Pack the bearing cap with fresh grease and lightly drive it into the hub recess with a hammer.
20. Reinstall the wheel onto the hub and torque the wheel lug-nuts.
NOTE: See wheel nut/bolt torque requirements located in section 2.4.
Bearing cup replacement:
1. Place the hub on a flat work surface with the cup to be replaced on the bottom side.
2. Using a brass drift punch, carefully tap around the small diameter end of the cup to drive it out.
3. After cleaning the hub bore area, replace the cup by tapping it with the brass drift punch. Be sure the cup
is seated all the way up against the retaining shoulder in the hub.