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DEMCO MODEL DA66B BRAKE ACTUATOR
INSTALLATION
The Model DA66B is completely assembled and ready to bolt into place.
1. Bolt the actuator to 3" square tongue with two 1/2" x 4-1/2" bolts Gr.5 and 1/2" nylon insert lock nuts.
Thin wall tongues require 3/4" O.D. x 11 gauge wall tubing as spacers inside the tongue. Tighten
bolts to 75 - 80 ft. lbs. torque. Make sure coupler is free to telescope inside of outer case.
2. Connect and tighten all brake lines.
3. Fill the Master Cylinder (#23) with DOT 3 or 4 brake fluid.
4. Bleed the brake system using a pressure-type brake bleeder or manually, as follows:
a. Remove the two Self-Tapping Screws (#15) and Lock Washers (#16) that hold the flat
Emergency Lever Spring (#17). Remove the Emergency Lever Spring. Using short strokes, pull
forward on the Emergency Lever (#11), pumping the Master Cylinder until the brake fluid within
the Master Cylinder stops bubbling.
b. Attach a bleeder hose to the bleeder valve on one of the wheels and submerge the other end
of the hose into a clean, transparent container partially filled with brake fluid. Loosen the bleeder
valveone turn and, watching the hose in the transparent container, use the Emergency Lever
to pump the Master Cylinder as long as air bubbles continue to leave the hose. When the
bubbles stop, close the bleeder valve, move to the next wheel, and repeat the process until all
the brakes have been bled. (Note: Check the fluid level in the Master Cylinder frequently while
bleeding the brakes (every 4 or 5 strokes). Refill as necessary to keep the level above half full.)
• Review all of the following instructions before installation and use of hydraulic brake
actuator.
• Dealers or Distributors must review these instructions with ultimate user.
• Failure to follow these instructions, or failure to properly maintain braking system after
installation, can result in loss of braking action which could cause severe property damage,
personal injury or death.
To Prevent Serious Injury Or Death:
To avoid personal injury or death Do not weld on the outer case without
disassembling actuator. The excessive heat may cause the actuator not
to function properly
To avoid personal injury or death, do not exceed lowest of (1) the rated
capacity of Model DA66B actuator, or (2) rated capacity of ball and hitch
being used, or (3) trailer's Gross Vehicle Weight Rating (GVWR).
Model DA66B brake actuator has a maximum load rating of 6000 lbs.
GVWR and 600 lbs. tongue load.
WARNING
WARNING
CAUTION