Hardi AEON CENTURA TWIN FORCE Instruction Book page 166

6 - Maintenance
9. Check the brake drum diameter (K) and lining thickness (L). Replace if worn.
Max. wear rates on brake components:
• Max. drum diameter (K): 402 mm (Large drums)
• Min. lining thickness (L): 2.0 mm
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WARNING! Never exceed the specified minimum lining thickness (L) is the absolute minimum. Replace the parts, if
they would reach the above dimensions before the next service inspection.
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WARNING! It is necessary to renew brake linings or brake drums for both sides at the same time.
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ATTENTION! If removing the brake drum from the wheel hub, a hydraulic press is required to press the wheel studs
out.
10. Remove the clevis pin between the air diaphragm cylinder and the
brake cam lever.
11. Remove the cotter pin (G), castle nut (F) and the brake shoe anchor
bolt (H), and slide the brake shoes over the cam. Twist the pair of
brake shoes to remove the shoe return springs (I). Replace the
brake shoes, if the linings worn out.
12. Apply a small amount of copper paste on moving parts,
reassemble the brake shoes, and shoe return springs (I).
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WARNING! Do not get copper paste in contact with the brake
linings and drums.
13. Fit the shoe assembly with the anchor bolt (H) first. Then pull the
shoes away from each other and slide them over the cam
afterwards. Tighten the anchor bolt castle nut (F) again, and fit a
new cotter pin (G).
14. Check roller bearings for discolouration and wear. Replace if worn
or damaged.
15. Assemble drum (D) and bearings (E) using a new sealing ring (J).
16. Fill the hub and bearings with new grease, before fitting them to the wheel axle.
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WARNING! Do not get oil or grease in contact with the brake linings and drums.
17. Fit the castle nut (C). Rotate the brake drum (D) and tighten the castle nut (C), until feeling a slight rotation resistance.
18. Loosen the castle nut (C) again, until the first notch aligns with the cotter pin hole in the axle.
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ATTENTION! The shaft has a vertical and a horizontal cotter pin hole. Use the one first aligned with the notch when
loosening the castle nut.
19. Fit a new cotter pin (B) and bend it to keep it in place.
20. Fit the hub cap (A) to the hub. Slightly tighten the 6 bolts.
21. Adjust the brakes as described in "250 Hours Service - Adjustment of Wheel Brakes" on page 164.
22. Fit the wheel again and tighten the wheel nuts. See "Tightening Bolts and Nuts" on page 152 regarding torque wrench
setting. Tighten all bolts to half the specified torque at first, and then tighten to the specified torque.
23. Tighten again after 10 hours of work. Check the torque every day, until it is stabilised.
24. Repeat the steps for servicing the left wheel. Remember to place chocks on both sides of the right wheel.
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WARNING! If you do not feel very confident changing wheel bearings or brakes, then contact your HARDI dealer's
workshop.
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