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INSTALLATION INSTRUCTIONS Type HM Parking Control Unit Wiring Diagram

FRB Fluid Reservoir/Bleeder (On Crane) TERM Transient Suppressor and Rectifier Module must be connected in circuit at all times. The module will protect the solenoid check valve coils by suppressing voltage surges that can occur in DC power supplies. The module operates as a full wave rectifier when the power supply is 115VAC. SCV Solenoid Check Valve. Subpart of J107206 HM Control Unit (*) PBL Parking Brake Light. Subpart of J45767 switch and light in cab. Connect as shown for 230V power supply. Use 115V terminal if 115V power supply used. MPR Motor Pilot Relay. Supplied by customer. Connect contacts to prevent drive motor operation until hydraulic pressure switch is closed.

(*) NOTE:	HM control unit is pre-wired for 230V DC operation. If the power supply is 115VAC, the solenoid coil must be re-wired as shown above.
BPB	Bleeder Pushbutton. J10008 in cab.
PBS	Parking Brake Switch. Sub part of J45767 Switch and Light Assembly. Connect "Normally Closed" terminals so that the TSRM and solenoid check valve are energized to keep the parking brake off when the selector switch is in the "OFF" position and the parking brake is on when the switch is in the "ON" position. If a "2 station" system is used, use two switch and light assemblies and connect the N.C. and N.O. contacts as a SPDT switch. Block out "OFF" and "ON" legends.
PS	Pressure Switch. Subpart of J107206 HM Control Unit. B and C contacts are preconnected for Normally Open switch operation. Switch must be adjusted so that contacts close at 400 psi and open at 320 psi hydraulic pressure.