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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
  6 x 3 and 8 x 3 Type H Brake
  10 x 4, 14 x 6 and 18 x 8
     Type H Brake
  Control Cylinder and Pedal
     (including dimensions)
  Fluid Reservoir/Bleeder
     Assembly (incl. dimensions)
  Piping and Wiring Diagram -
     One Brake System
  Piping and Wiring Diagram -
     Two Brake System
  Tubing Installation
     SERVICE
  6 x 3 and 8 x 3 Type H Brakes
  10 x 4, 14 x 6 and 18 x 8
     Type H Brakes
  Control Cylinders
  Fluid Reservoir/Bleeders
 
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 GEMCO Type H & HM Installation, Dimensions and
 Service Manual:
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SERVICING INSTRUCTIONS
 6 x 3 and 8 x 3 Type H Brakes
  

 
BRAKE RELINING INSTRUCTIONS

Replace brake lining when it is worn to 3/16" thick.
 
Remove clamp nut 16 and adjusting nut 15 and anti-drag hinge pin 11. Open the brake arms and remove the lining bolts and nuts and lining
 
* Use new J387 lining bolt and nuts when replacing the lining. Reassemble hinge pin 11 and nuts 15 & 16.
 

BRAKE ADJUSTMENT
The brake is adjusted with clamp nut 16 loose. Turn adjusting nut 15 wrench tight, with brake lining clamped against the wheel. Then back off adjusting nut two and one half turns and tighten clamp nut. This provides approximately 1/32" brake wheel-to-lining clearance.
TYPE H HYDRAULIC ACTUATOR
REMOVAL AND SERVICE
 
Loosen and remove clamp nut 16 and adjusting nut 15. Tap out hinge pin 8 and remove cylinder from brake.
 
To disassemble cylinder, slide cylinder cover 22 off the body. Unscrew connecting rod 17, being careful that return spring 18 does not force cylinder and connecting rod apart. Remove return spring, spring guide 20, pin guide 23, piston 24, cup 25 and spring 26. Replace complete J7841 actuator, 17-26, if cylinder walls are scratched or pitted. If rebuilding actuator, discard items 21, 24, 25, and 26. Wash remaining parts in denatured isopropyl alcohol. Before reassembly dip all parts in Super Heavy Duty Brake Fluid. Reassemble in reverse order.
ANTI-DRAG
ASSEMBLY
SERVICE
  
The anti-drag assembly, 10-13, maintains 1/32" clearance between the attached shoe and
lining and the brake-wheel, regardless of lining wear. If the brake is adjusted correctly, the opposite lining clearance is 1/32" and the brake cannot drag.
 
The anti-drag assembly is prelubricated and no maintenance is required.
 
If service is necessary, J105190 Anti-Drag Kit is available, which includes a 9414 retractor spring assembly 10, 9429 pin 11, 9428 anti-drag housing 12, and 9423 pin 13.
 

 
Cross-section drawing of hydraulic actuator assembly.
 
* As of January 1993 brake assemblies and replacement shoes have bonded linings. These bonded
shoes can be rebonded. Additionally rivet type replacement linings can still be purchased for use
with old style rivet shoes/linings.