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  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
 		     INSTALLATION
  Type A/HM-ERC Panel
     J100650 - J100661,
     J103650 - J103661
  Type A/HM-HRC Panel
     J100330 - J100341,
     J103330 - J103341
  Type A/HM-ARC Panel
     J10440 - J104411,
     J104424 - J104435
 
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 GEMCO Type H & HM Installation, Dimensions and
 Service Manual:
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INSTALLATION INSTRUCTIONS
Type A/HM-ARC Panel
 
THESE INSTRUCTIONS COVER INSTALLATION OF THE FOLLOWING PANEL ASSEMBLIES:
Power Supply
380, 460 or 575V, 50/60 Hz AC
230VDC
Service
Pressure
Cluster
Air Hydraulic Ratio
8 x 1
5 x 1
8 x 1
5 x 1
No. of
service
pressure
clusters		 1*
2**
2*		 33" x 45" Panel
Assembly Only
(No Enclosure)
J104400
J104402
J104404
J104401
J104403
J104405
J104406
J104408
J104410
J104407
J104409
J104411
1*
2**
2*		 Panel Assy. Mounted
lnside 36 x 48 x 18
Enclosure
J104424
J104426
J104428
J104425
J104427
J104429
J104430
J104432
J104434
J104431
J104433
J104435
* Also Includes 1 - 8 x 1 ratio parking brake release pressure cluster below service cluster.
** Also Includes 2 - 8 x 1 ratio parking brake release pressure clusters below service clusters.

A/HM-ARC PANEL PIPING DIAGRAM
Mount the panel on a rigid vertical support, low enough for the 1/2" air line from the compressor to slope down to the air reservoir. This permits moisture to drain to the reservoir where it can be automatically ejected by the moisture valve.
 
Pipe and wire the panel into the system per applicable connection diagrams.
 
After the brake system is completely piped and wired, turn power ON. Check preset air pressures:
 
  1. Compressor supply pressure at gauge A must range from 75-90 psi. This pressure is controlled by 1PS N.C. pressure switch.

    2.  
  2. Emergency pressure step (ON when ESV solenoid valve is deenergized) is factory set at 40 psi by regulator in front of gauge B.
  1. Abnormally low compressor supply pressure is signalled by 2PS N.O. pressure switch, which must close on 60 psi increasing pressure and open on 50 psi decreasing pressure.
SPECIAL BLEEDING AND PRESSURE ADJUSTMENT INSTRUCTIONS
FOR A/HM-ARC SYSTEM
  1. Fill fluid reservoir/bleeder(s) and pressure cluster(s). Bleed the service brake circuit by holding BPB service brake bleeder pushbutton in and stroking the service brake pressure cluster(s) by repeatedly pushing BFP brake filling pushbutton. Bleed the parking brake circuit by holding BPB parking brake bleeder pushbutton in and stroking the parking brake pressure cluster(s) by repeatediy pushing the BCV bleed control valve.

    2.  
  2. After the brake system is bled and brakes are adjusted, operate brake system. Operation should
 be precise, without noticeable time delay. Check operation of emergency brake stop by disconnecting power. The crane should come to a quick stop without abnormal hook swing. Adjust emergency brake pressure at gauge B if necessary. Note: twenty seconds after high pressure step application, the protection valve control pressure is reduced, causing the valve to exhaust parking brake release pressure. Parking brakes are spring applied. High pressure step is then exhausted from the service brake pressure cluster(s).
AC WIRING DIAGRAM
TYPE A/HM-ARC AIR/HYDRAULIC
PREWIRED CONTROL PANEL
DC WIRING DIAGRAM
TYPE A/HM-ARC AIR/HYDRAULIC
PREWIRED CONTROL PANEL
Note: Standard AC Panels Are Designed For 460V Operation.
1PS - N.C. Compressor Start-Stop Switch (80/65 PSI)
2PS - N.O. System Pressure Switch (60/50 PSI)
BPB - Bleeder Pushbutton
BPB - Service Brake Filling Pushbutton