INSTALLATIONS INSTRUCTIONS
10 x 4, 14 x 6 And 18 x 8 Type HM Brake Assemblies
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Before installing this brake, note the following features:
- This brake is suitable for floor mounting only.
- The brake shoes are adjusted by nut A and clamped by nut B.
- A shoe-centering plug is at the base of the shoe arm opposite the brake actuators.
- An Allen head set screw clamps the tubular push rod in the yoke.
- Index hole C is in the center of the brake base.
- The brake assembly is completely adjusted after inspection at the factory.
- Spring force of the parking cylinder applies the 10x4 HM brake, and adjusting nut A must be loosened to slip the brake over the wheel. Spring force of the parking cylinder on 14x6 and 18x8 HM brakes has been temporarily relieved by disconnecting the parking cylinder at the bottom bracket.
- Do not alter the centering adjustment or the tubular push rod adjustment, nor attach the parking cylinder to the bottom bracket on 14" and 18" brakes until "Final Adjustment" steps.
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| BRAKE INSTALLATION |
FINAL BRAKE ADJUSTMENT |
- Install the brake wheel.
- 10x4 Brake. Loosen adjusting nut A enough to slip the brake over the wheel. Sip brake over wheel and tighten nut A until shoes are clamped firmly against the wheel. Note that the shoes will clamp the wheel before nut A reaches original position because the parking cylinder is extended. Additional tightening is not necessary at this time.
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- After brake system is completely connected, filled with brake fluid and thoroughly bled, operate system to fully compress the parking cylinder. (a) On HM manual cab-operated systems, step down hard on brake pedal and turn parking switch unlil Green light is "ON." Release brake pedal. Green light should stay "ON." (b) On AHM-HRC air-powered cab-controlled systems, turn parking switch until Green light is "ON." (c) On AHM-ERC remote-controlled systems,
power "ON" will automatically compress parking cylinder. Parking cylinder should remain fully compressed during steps 2-7.
- Install pin to connect parking cylinder to bottom bracket on 14" and 18" brakes.
- Turn clamp nut B free and tighten adjusting nut A to clamp brake shoes firmly against the brake wheel.
- Back off adjusting nut A three turns and tighten clamp nut B.
- Both brake shoes should now be approximately 1/32" from the brake wheel. If both shoes are not an equal distance from the wheel, adjust self-centering mechanism. (See item C above.)
- With parking brake still fully released, recheck tubular push rod adjustment to be sure that parking cylinder force does not bear against the top brake lever. There must be clearance as follows:
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14x6 and 18x8 Brakes. Free parking cylinder from bottom bracelet to eliminate all application force. Slip brake over wheel. Loosen clamp nut B
and tighten nut A until shoes are clamped firmly against the wheel. Do not attach the parking cylinder to the bottom bracket until "Final Brake Adjustment" steps.
Final adjustments and inspections are made after the brake is hydraulically operational. The brake should remain firmly clamed against the wheel
throughout the remaining installation steps.
- Level brake base by plumbing center of brake wheel shaft to index hole C in the base of the brake.
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- Add shims between the brake base and support. Bolt brake base to support.
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If necessary, loosen set screw and adjust tubular push rod to give indicated .010" clearance and tighten set screw. |
- Using F-17 copper gasket seal, screw short threaded end of armored hoses into both actuating cylinder ports and in parking cylinder port. Do not remove bleeder screw and adaptor from the second port on the parking cylinder unless a second brake is being used. See piping diagram. Wrench tighten hoses to provide leak-proof seals.
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- Use mounting bracelets, lock washers and jam nuts provide to attach free end of hose to rigid support. Allow hose to slack to permit movement of actuator.
- The base is now ready to be piped into hydraulic system.
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- The brake is now properly adjusted. Check service brake and parking brake operation.
Follow above insiructions when readjustment is necessary to compensate for lining wear. |