Model LP850 Actuator Owners Manual
Installation Instructions and Service Manual Model LP850 Actuator* for Trailer Brakes 8,500 lbs. Capacity Disc Brake Ready *US Patent No.
MODEL LP850 ACTUATOR INSTALLATION INSTRUCTIONS IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION/ ASSEMBLY PROCEDURE BEFORE INSTALLING YOUR BRAKES AND ACTUATOR. The Model LP850 works by the “surge” or “push” of the trailer toward the tow vehicle. This automatically synchronizes the trailer brakes with the tow vehicle axle brakes. When the trailer pushes against the tow vehicle, the actuator telescopes together and applies the force to the master cylinder, supplying hydraulic pressure to the brakes.
3. Check with your state motor vehicle department for laws concerning minimum trailer brake requirements. Some states may require brakes on all axles. 4. Road test trailer a short distance to activate the actuator several times. Check fluid level again. Remember, low brake fluid levels will result in hitch ball knocking and loss of breaking power. 5. When testing is completed, make sure master cylinder is filled to 3/8” below the top of the reservoir and filler cap is securely in place.
7. Any control devices that restrict operation of the actuator cannot be used. This includes certain sway control devices. The actuator must be free to telescope in response to braking requirements. 8. Equalizing or weight distributing hitches may be used, allow six to eight inches free chain length. DANGER: Tongue weight beyond rating limits will interfere with performance of actuator, and braking system, and the tow vehicle. 9. The actuator is designed for use with Free-Backing trailer brakes.
WARNING Actuator and brakes should always be flushed with fresh water after using trailer in corrosive conditions. This includes salt water, fertilizers and other corrosive materials. Before storing trailer remove brakes and clean thoroughly. It is also wise to repack the bearings at the same time. Failure to properly and adequately maintain the actuator could cause serious damage, injury or death.
WARNING A loose fit between the coupler and hitch ball can cause the actuator and hitch ball to separate, causing serious damage, injury or death. Check coupler every time prior to towing and at each stop on long trips. Always make certain that coupler latch safety pin is securely installed into coupler latch. WARNING Brake laws sometimes are minimum standards and you may wish to add additional brakes to your trailer.
Bleeding Instructions for Model LP850 Bleeding Tools Required: 5/8” Socket Wrench 5/8” Wrench 7/16” Wrench 3/8” Wrench Adjustable Pliers (standard and large size) Hammer Block of wood To bleed master cylinder and brakes, install bleeder hose on first wheel cylinder to be bled; if tandem axle trailer, bleed closest axle first, and the closest brake on that axle first.
Typical Brake Line Placement Brake Line Connector Connector Actuator End Bleeder Connector Front - Trailer Rear - Coupler Bleeding access hole is located on the drivers side in the middle of the Actuator To pump master cylinder, insert a flat tip screwdriver into the round hole on “LEFT” (Drivers side) of the actuator cover. (see right). Standing in front on the actuator, place one hand on the E-Stop Release witch is located under the coupler housing.
Emergency Stop Release Press the E-stop upward, (to release) at the same time move the screwdriver forward and back to pump the master cylinder. While holding the E-Stop, pump the master cylinder 4 to 5 times. On the 5th pump hold that position and check for bubbles in the brake lines. While pressing the E-stop release, pump the master cylinder with your right hand 4 to 5 times.
The bleeding operation for that brake is complete when bubbling stops. Be sure to tighten bleeder screw securely. Each wheel cylinder must be bleed until all air is out of the lines. Replenish the brake fluid during the bleeding process so the level does not fall below half full level in the master cylinder reservoir. When bleeding and testing is completed, make sure master cylinder is filled to 3/8” below the top of the reservoir and filler cap is securely in place.
Model LP850 Replacement Parts 8,500 lbs.
1A & 4 1A 1B 1A Item # Part # 1A 70436K 1B 11286 2 50314 3 50313 4 48986A 5 70431LK 6 70432K Description Disc Brake Master Cylinder Kit, Includes: master cylinder, filling cap, top and bottom slide plates, pins with retaining rings Disc Brake Solenoid - used with Disc Brake Actuators Safety Cable with stainless steel pin Emergency Stop Cable (E-stop/Breakaway) Master Cylinder Fill Cap with internal bladder, 2.
TIE DOWN ENGINEERING LIMITED WARRANTY Limited Warranty TIE DOWN ENGINEERING (“TIE DOWN”) warrants its products to be free from defects in material and workmanship for one year from date of delivery to the original purchaser when properly installed, used and maintained by the purchaser. This warranty does not apply to damage or loss caused by any or all of the following circumstances or conditions: • Damage caused during installation.
To Obtain Technical Assistance: To enable TIE DOWN to respond to a request for assistance or evaluation of customer or user operating difficulty, please provide at a minimum the following information by calling 1-800-241-1806: • Model number, serial number and all other data on the specific component which appears to be involved in the difficulty. • The date and from whom you purchased your TIE DOWN product.
TIE DOWN ENGINEERING 255 Villanova Drive SW, Atlanta, GA 30336 (404) 344-0000 • Fax (404) 349-0401 © 2014 TIE DOWN ENGINEERING, ALL RIGHTS RESERVED Instruction Manual #08215 052114,C1345 Model LP850 Actuator Owners Manual
