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  GEMCO Type H & HM Installation, Dimensions
     and Service Manual:
  Type H Brake System
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     (Type A/HM) Brake System
  Type A/H and A/HM General
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     Instructions
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  Type H to HM Conversion
     Instructions
 
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 GEMCO Type H & HM Installation, Dimensions and
 Service Manual:
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INSTRUCTIONS FOR CONVERTING
Type H to Type HM Brake System
 
  1. Install HM Releasing Cylinder and HM Brake Kit parts.

    2.  
  2. Install J-107154 HM Control Unit and J-45767 Parking Switch and Light.

    3.  
  3. Add hydraulic tubing and hose to connect HM control unit, HM releasing cylinder and existing brake actuator per piping diagram.

    4.  
  4. Refill FRB reservoir full using ONLY 21B Super Heavy Duty Brake Fluid, or equal.

    5.  
  5. Turn crane power ON.

    6.  
  6. Temporarily reposition brake pedal to permit at least 17" stroke.

    7.  
  7. Depress BPB bleeder push button. Step on control cylinder brake pedal through full stroke. Repeat this step at least 10 to 15 times. Keep FRB reservoir full while refilling brake system. This step will
          refill the pressure line from the control cylinder,
         to the HM control unit, to the brake actuating
         cylinder, to the FRB reservoir.
  1. To bleed line from HM control unit to HM releasing cylinder -

    2.  
    • Open bleeder screw at HM releasing cylinder on brake.

      •  
    • Use bleeder hose and glass jar or catch rag and step on brake pedal until clear fluid escapes. Close bleeder screw. Do not operate bleeder during this step.

      •  
    • This dead ended line should now be bled free of air.

     
  2. Refill FRB reservoir to within 1" of opening and replace filler cap and gasket.

    3.  
  3. Adjust brake per instructions.
  1. Install mounting bracket "A." Brake has three holes in base to mount bracket.

    2.  
  2. Replace original top lever arm with new lever arm furnished in brake kit. Reinstall pin "D" with existing spring hooks, new yoke, pin and link assembly, and new hydraulic actuating cylinder. Attach bottom of hydraulic actuating cylinder to brake shoe with pin "E." Reinstall adjusting nut "A" but do not tighten.

    3.  
  3. Thread tubular push rod on HM releasing cylinder into yoke. Do not tighten yoke until brake is readjusted.

    4.  
  4. Attach bottom of HM releasing cylinder to bracket "A" with J-9670 pin provided.

    5.  
  5. Insert cotter pins in the three pins and reinstall return springs.

    6.  
  6. Brake is now reassembled. It must be readjusted after all other system components are installed and the hydraulic system is refilled and bled.
CONVERTING 14x6 AND 18x8 BRAKES
  1. Install mounting bracket "A." Brake has three holes in base to mount bracket.

    2.  
  2. Loosen adjusting nut "A." Remove existing hydraulic actuator. Attach bottom of new actuator to brake shoe with pin "E."

    3.  
  3. Attach top of actuator, yoke, tie links, hinge pins, and top lever arm, as illustrated.

    4.  
  4. Thread tubular push rod into yoke. Do not tighten yoke.

    5.  
  5. Insert HM releasing cylinder shaft in yoke. Attach bottom of releasing cylinder to bracket "A."

    6.  
  6. Insert cotter pins at all hinge pins.

    7.  
  7. Brake is now reassembled. It must be readjusted after all other system components are installed and the hydraulic system is refilled and bled.
After brake system is completely reconnected, refilled with brake fluid, and thoroughly bled, step down hard on brake pedal. Green signal light should go "ON" indicating that parking brake is released. Release brake pedal. Brake shoes should now be free.
  1. Turn clamp nut "B" free and tighten adjusting nut "A" to clamp brake shoes firmly against brake wheel.

    2.  
  2. Back off adjusting nut "A" three turns and tighten clamp nut "B".

    3.  
  3. Both brake shoes should now be approximately 1/32" from the brake wheel. If both brake shoes are not an equal distance from the wheel, adjust self-centering mechanism at bottom of brake shoe arm.

    4.  
  4. With parking brake still fully released, sure that parking cylinder force does not bear against top brake lever. Adjust tubular recheck tubular push rod adjustment to be push rod to give indicated .010" clearance. Tighten Allen head set screw on yoke.
 There must be clearance as follows:
  1. The brake is now properly adjusted.

    2.  
  2. Check service brake and parking brake operation.