Specifications

Page 2
DEMCO MODEL DA91 ACTUATOR
Table of Contents
General information ..................................................................................... 2
Warranty Policy & Registration .................................................................... 2
Safety, Signal Words and Equipment Safety Guidelines ............................. 3
Safety Sign Locations & Safety Sign Care .................................................. 4
Before Operation ......................................................................................... 5
During Operation ......................................................................................... 5
Following Operation ..................................................................................... 6
Highway and Transport Operations ............................................................. 6
Performing Maintenance .............................................................................6-7
Bolt Torque ................................................................................................... 7
Actuator Parts Breakdown and Parts List .................................................... 8
Actuator Kits and Options ............................................................................ 9
Bolt Weight Rating Warning ........................................................................ 10
Welding ....................................................................................................... 10
Outer Case Options and Available Hitch Configurations Breakdown ......... 10
Outer Case Options and Available Hitch Configurations ............................ 11
eZ-Latch Coupler Operations ..................................................................... 12
Actuator Installation and Maintenance ....................................................... 14
Rue Ring Installation .................................................................................. 15
Model DA91 is a heavy duty surge brake actuator for trailers with two or four wheels.
When brakes are applied on the towing vehicle, forward inertia of trailer toward
towing vehicle applies brakes on trailer in direct relation to manner brakes are applied
on towing vehicle. Brake pressure applied on tow vehicle will cause equal response
on trailer brakes. Master cylinder push rod spring assembly protects system from
hydraulic pressure overload.
• Review 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.
WARNING: To Prevent Serious Injury or Death
All Demco actuators and brake assemblies are
compatible with DOT 3 or 4 brake fluid.
WARRANTY POLICY & REGISTRATION
Go online to www.demco-products.com to review Demco warranty policies and register your Demco product.