Cushman 306-11 Anti Hop Kit with Jake Brake
The Cushman 306-11 Jake Brake Gear Retention Kit can be assembled to the transfer case without the necessity of removing the unit from the truck. It will fit all units with serial number 1291 and up. Prior to the beginning the installation, locate the airline to the original high/low shift cylinder located on front face of the transfer case housing. This line will be the source of the signal pressure for the new valve. Also, locate a source of continuous system air pressure for the new cylinder. DO NOT use pressure from any of the brake system. The kit includes ' inch tubing for signal pressure and 3/8 inch tubing for actuation pressure.
Block the vehicle securely and release the air pressure in the vehicle operating system NOT the brake system. Located the shift rod housing hole cover (75) located on the rear face of the housing slightly below the input. The next step REQUIRES EXTREME CAUTION. Since the cap is under shift spring pressure, use extreme care in its removal. Unscrew the cap. Leave the shift return spring in place. Installation is best accomplished with the shift on the low side.
Apply the sealing washer (2) to the shift cylinder adapter and install the adapter taking care to index the shift shaft into the adapter during installation. Install piston (5) on extension shaft (1) using SHCS (8) and lock washer (21). Lightly oil o-ring (9) and install it on the piston. Insert the completed piston into the adapter. Lightly coat the inner surface of the cylinder (3) with oil and install it over the piston and sealing ring and retain it with '-20 SHCS.
Mount the shift signal relay valve and plumb the new shift cylinder as shown on the plumbing diagram using the supplied tubing.
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