Product Selector   Gemco 1997 Gate Hoist Lmt Swtch Gemco Stamping Press Control Gemco 1980 Micro-Adjust Cams Gemco 1980S Limit Switch Manual Gemco 2000 Rotary Limit Switches Gemco 3001 Adjustable Couplings Brake Systems Application Guide Model CB/TM Brakes Manual Model ET Shoe Brakes Manual Model H Shoe Brakes Manual Model H Brake Parts Manual   GEMCO Type H & HM Installation, Dimensions      and Service Manual:   Type H Brake System   Type HM Brake System   General   Brake Dimensions   Air-Over-Hydraulic (Type A/H)      Brake System   Air-Over-Hydraulic Parking      (Type A/HM) Brake System   Type A/H and A/HM General      Information   General Troubleshooting                 NOTE: Installation and service   information for control cylinder,   fluid reservoir bleeder, and   pushbutton illustrated under   Type H brake systems also   apply to Type HM systems.      INSTALLATION   6 x 3 and 8 x 3 Type HM      Brakes   10 x 4, 14 x 6 and 18 x 8      Type HM Brake   Type HM Parking Brake      Control Unit (Incl. J45767      switch & light)   Wiring Diagram Type HM      Parking Control Unit   Piping Diagram One Brake,      6 x 3 and 8 x 3 Type HM   Piping Diagram Two Brakes,      6 x 3 and 8 x 3 Type HM   Piping Diagram One Brake,      10 x 4, 14 x 6 and 18 x 8      Type HM      SERVICE   6 x 3 and 8 x 3 Type HM   10 x 4, 14 x 6 and 18 x 8      Type HM Brake   Servicing 10", 14" and 18"      Type HM Park Release      Cylinders

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INSTALLATION INSTRUCTIONS Type HM Parking Brake Control Unit J107206
HOW THE CONTROL UNIT WORKS Type HM brake system. Fluid is forced through the control unit to the brake cylinders. Fluid displaced to the service cylinders applies the service brakes and fluid displaced to the parking brake release cylinders releases the parking brake. When pressure at the control unit inlet port is relieved, the service brakes release; but the fluid in the lines to the releasing cylinders is trapped by the energized check valve in this control unit. When sufficient pressure (400 psi) is built up and trapped in the releasing cylinders, the pressure switch in this control unit closes. This energizes the signal light in the cab and permits the drive motor to be started. When power to this control unit is interrupted, pressure is relieved from the releasing cylinders and the parking brakes are automatically applied by spring force.	Normal brake operation with this control unit energized tests the proper operation of the control unit. Any visible fluid leaks will prevent proper operation and must be repaired to prevent the parking brakes from applying when a good magnetic check valve is energized. The coil used in the check valve is factory preconnected for 230VDC operation. The coil leads must be reconnected at the terminal board for operation at 115V, 50/60 Hz. The rectifier converts 115VAC to 115VDC coil voltage when connected for AC operation. This same rectifier protects the coils from high voltage as is sometimes generated when 230VDC power is interrupted.   INSTALLATIONS Mount the control unit on the bridge on a rigid vertical surface. On single brake systems, locate the unit near the brake. On 6" and 8" double brake systems, locate the unit midway between the two brakes.
PARKING SWITCH AND LIGHT J45767 The parking switch provides operator control of the magnetic check valve in the HM control unit.   The green signal light is controlled by the pressure switch in the control unit. The signal light assembly uses a standard 115V bulb. A resistor is included for 230V.   Install the parking switch and light in the cab, convenient to the operator. Connect electrical units per applicable diagram.