1000 Hours Service - Wheel Bearings And Brakes - Hardi COMMANDER DELTA FORCE Instruction Book

6 - Maintenance

1000 Hours Service - Wheel Bearings and Brakes

Check the condition of the bearings and brake wear parts in the following way:
1. Place chocks in front of and behind the left wheel. Jack up the right
wheel to be serviced.
2. Support the trailer with axle stands or strong trestles.
3. Remove the wheel.
4. Unscrew the 6 bolts and remove the hub cap (A), cotter pin (B) and
castle nut (C).
5. Pull off the brake drum (D). Use a wheel puller if necessary.
6. Vacuum the brake drum (D) for brake dust, or rinse it with water.
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DANGER! Brake dust can cause severe health injuries! Avoid
inhalation of brake dust! Wear a dust mask when servicing the brakes. Do not clean brakes with compressed air! Use
a vacuum cleaner or rinse with water to avoid brake dust being blown around.
7. Rinse the remaining parts on the brake carrier plate with water and wipe them off.
8. Remove roller bearings (E), clean all parts with a degrease detergent and wipe them.
9. Check the brake drum diameter and lining thickness. Replace if worn.
Max. wear rates on brake components:
• Max. drum diameter: 302 mm (Small drums)
• Max. drum diameter: 402 mm (Large drums)
• Min. lining thickness: 2.0 mm
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WARNING! The specified minimum thickness is the absolute minimum, which must never be exceeded. Replace the
parts, if they would reach the above dimensions before the next service inspection.
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WARNING! Renewal of brake linings or brake drums must be done for both sides at the same time.
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ATTENTION! If the brake drum must be removed 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 are worn.
12. Apply a small amount of copper paste on moving parts and
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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