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TIE DOWN ENGINEERING • 255 Villanova Drive SW • Atlanta, GA 30336

www.tiedown.com (404) 344-0000 Fax (404) 349-0401

Installation Instructions and Service Manual

Model 80, 80-3/4 & 80E

Actuator* for

Trailer Brakes

8000 lbs Capacity

Part #47206/47207 - Drum Brake Ready

Part #47208/47209/47214 - Disc Brake Ready

Includes 8000# rated 2” Ball with 1” shank

*US Patent No. 6,375,211

MODEL 80 ACTUATOR INSTALLATION INSTRUCTIONS

IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION/ASSEMBLY PROCEDURE BEFORE INSTALLING YOUR

BRAKES AND ACTUATOR.

The Model 80 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. The built in dampening shock absorber retards the telescoping shock against

the hitch ball by depending on the brake fluid in the master cylinder. Low levels of brake fluid will signal the tow vehicle operator to add

brake fluid via coupler knocking.

Be sure to comply with regulations for brakes in your state. Brake laws sometimes are minimum standards and you may wish to add

additional brakes to your trailer to meet minimum Gross Vehicle Weight Ratings (GVWR).

Read your tow vehicle owner’s manual on towing capacity and other towing recommendations before installing brakes or this actuator.

The Model 80 Actuator is completely assembled and ready to bolt into place (Tongue sizes: 3”x3”, 3’x4” & 3”x5”).

1. Bolt the actuator to the tongue-using grade 5 bolts 1/2 inch in diameter, 4 inches long. Lightweight tongues, less than 10 gauge, require

spacer tubes inside the tongue for reinforcement. Attachment strength should equal or exceed 1-1/2 times trailer G.V.W.R.

2. Hydraulic brake lines should be installed on the trailer as described in the installation manual supplied with the brakes. Note: Some disc

brakes require the use of flexible brake lines at the connection POINT on the brake caliper. Follow brake manufacturer instructions.

3. Tie Down’s actuators feature a shock dampener that uses brake fluid from the master cylinder. The dampener must be primed before

bleeding or using trailer. To prime the dampener, fill the master cylinder with DOT 3 brake Fluid. Push the coupler into the housing and

slowly pull out 3 times, then refill master cylinder.

4. Use only DOT-3 brake fluid in the Model 80 actuator. Use a pressure type brake bleeder to bleed brakes. (This type of brake bleeder is

available at your local automotive jobber.) Follow manufacturer’s directions. Or, manually bleed the brakes using a heavy-duty flat blade

screwdriver inserted in the hole provided on top of the actuator near the front. Insert the screwdriver and use a pumping action to

activate the master cylinder in order to bleed the brakes. See page 8 for more details.

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. Use a loose end of hose from the bleeder valve submerged in a glass container of brake

fluid to observe bubbling (hose must be submerged into clean brake fluid to keep air from traveling back into the brake cylinder).

Loosen the bleeder screw located in the wheel cylinder one turn, the system is now open to the atmosphere. The bleeding operation for

that brake is complete when bubbling stops. Be sure to tighten bleeder screw securely.

030708,C178

Instruction # 15388

For Serial Numbers 16020 and above.

Summary of content (8 pages)

PAGE 1
Installation Instructions and Service Manual For Serial Numbers 16020 and above. Model 80, 80-3/4 & 80E Actuator* for Trailer Brakes 8000 lbs Capacity Part #47206/47207 - Drum Brake Ready Part #47208/47209/47214 - Disc Brake Ready Includes 8000# rated 2” Ball with 1” shank *US Patent No. 6,375,211 MODEL 80 ACTUATOR INSTALLATION INSTRUCTIONS IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION/ASSEMBLY PROCEDURE BEFORE INSTALLING YOUR BRAKES AND ACTUATOR.
PAGE 2
Each wheel cylinder must be bled 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 approximately 3/8” below the top of the reservoir and filler cap is securely in place. 5. Check with your state motor vehicle department for laws concerning minimum trailer brake requirements.
PAGE 3
6. 7. Actuator travel (shown by coupler roller path) over one inch indicates a need to adjust the brakes or add fluid to the reservoir or a need to bleed the brakes and check connections for leaks. Adjust per instructions found in brake installation manual. In general, back-off the adjusters on drum brakes from locked position, as required. Adjust Free-Backing brakes by rotating wheel in forward direction only. Failure to adjust may result in loss of braking.
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Model 80 & 80E Trailer Actuator Parts Diagram 10 Tie Down Engine erin Use On g ly DOT8 Fluid 8 9 11 1 13 1 7 8 12 6 5 1 4 2 2 Latch 3 Coupler 4 2 2 2 4 Ball Adjusting Nut Safety Lock Hole 2 2 Note: When the coupler is placed on the ball, the latch should close firmly. If it feels loose or too tight, the adjustment nut should be turned to correct the fit.
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Model 80, 80-3/4 & 80E Actuator Part List Item 1 2 3 4 5 6 7 8 9 10 11 12 13 Part # 47268 (Drum) 47260 (Disc*) 47261 47262 48801-1A 47263 50305 50302 50301 47206-1 47214-1 48822-1 47264 47265 48804 48845 11253A 11262 Description Master Cylinder Assembly - Includes all nuts, baffle, all seals, O-rings, gaskets & seals (*check valve removed) Latch Kit Assembly Latch Kit Assembly (for serial #'s 16020 and below) Coupler Housing Roller Kit includes: 1/2" X 4 Grade 5 Super Lube Bolts (2) 1/2" Hex Center Lo
PAGE 6
TIE DOWN ENGINEERING LIMITED WARRANTY Limited Warranty TIE DOWN ENGINEERING Inc (“TIE DOWN”) warrants its products to be free from defects in material an 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.
PAGE 7
THIS WARRANTY EXCLUDES ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR ANY PURPOSE. THIS WARRANTY DOES NOT COVER NOR EXTEND TO INCIDENTAL OR CONSEQUENTIAL DAMAGE. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
PAGE 8
Instructions for Bleeding Tie Downs Model 66, 70, 80 & 85 Actuators 1 Tie Down's actuators feature a shock dampener that uses brake fluid from the master cylinder. The dampener must be primed before bleeding or using trailer. To prime the dampener, fill the master cylinder with DOT 3 brake Fluid. Push the coupler into the housing and slowly pull out 3 times, then refill master cylinder. To pump master cylinder, insert a flat tip screwdriver into the round hole near the front of the actuator cover.