Demco DA66B User Manual

DOING OUR BEST TO PROVIDE YOU THE BEST

DA66B

BRAKE ACTUATOR

OPERATORS MANUAL

11-05

BH20030, Rev 0

ASSEMBLY
CALIBRATION
OPERATION
REPLACEMENT PARTS

READ complete manual CAREFULLY

BEFORE attempting operation.

DEMCO • Dethmers Mfg. Co. • 4010 320th St. • P.O. Box 189 • Boyden, IA 51234

PH: [phone] • Toll Free: 1-800-543-3626 • FAX: [phone]

www.demco-products.com

Page 1

DEMCO MODEL DA66B ACTUATOR

Model DA66B is a hydraulic 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 towing vehicle hard and brakes on trailer are applied hard.
Master cylinder push rod spring assembly protects system from hydraulic pressure
overload.

WARNING: To Prevent Serious Injury or Death

• 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.

Table of Contents

General information ............................................................................................................ 2

Warranty Registration....................................................................................................... 3-4

Safety, Signal Words .......................................................................................................... 5

Equipment Safety Guidelines ............................................................................................. 6

Safety Sign Locations......................................................................................................... 7

Safety Sign Care ................................................................................................................8

Remember ......................................................................................................................... 8

Before Operation ................................................................................................................9

During Operation ............................................................................................................. 9-10

Following Operation........................................................................................................... 11

Highway and Transport Operations ................................................................................. 11-12

Performing Maintenance ................................................................................................... 12

Bolt Torque ........................................................................................................................13

DA66B Brake Actuator Parts Breakdown and Parts List................................................. 14-15

Actuator Installation and Maintenance............................................................................ 16-17

Demco Brake Products Limited Warranty ..........................................................................18

Demco Brake Products Limited Warranty Cont. ................................................................ 19

Page 2

Ag ❍

Warranty Registration

RV ❍
Rental ❍

Dethmers Manufacturing Company
4010 320th Street • Box 189 • Boyden, Iowa 51234
Toll Free 800-54DEMCO (800-543-3626) • FAX [phone]
www.demco-products.com

Very

Satisfied

Satisfied

Dissatisfied

How satisfied are you with our product? ❍❍❍❍

How satisfied are you with the dealership/distributor sales staff? ❍❍❍❍
Dealer/Distributor Name

City

State

How satisfied are you with the company sales staff? ❍❍❍❍

How satisfied are you with the delivery? ❍❍❍❍

Did you have any contact with a Demco Representative? YES NO
If YES, how satisfied were you? ❍❍❍❍

I would recommend this product to my family and friends. YES NO

Brakes ❍
Marine ❍

Very

Dissatisfied

Would you purchase again from DEMCO? YES NO

Since taking delivery, have you been contacted by the dealer? YES NO

Did you have any problems with this DEMCO product? YES NO
If YES, are you satisfied with the company’s resolution of your problem? ❍❍❍❍

Why did you purchase this product?

Please list the specific source of information prompting this purchase.

After purchasing this product, do you see any needed product improvement? If yes, what improvement?

What other products would you like to see DEMCO offer?

Comments

Owner’s Name: Mailing Address:

City: State: Zip Code:

Model#:
Serial #:
Purchase Date:

Owner’s Signature:

Please return to DETHMERS MFG. CO. By FAX or tri-folding this form to the backside, it is pre-addressed.

Page 3

Dethmers Manufacturing Company
4010 320th Street, Box 189
Boyden, Iowa 51234

Postage

Page 4

SAFETY

TAKE NOTE! THIS SAFETY ALERT SYMBOL FOUND THROUGHOUT THIS
MANUAL IS USED TO CALL YOUR ATTENTION TO INSTRUCTIONS INVOLVING
YOUR PERSONAL SAFETY AND SAFETY OF OTHERS. FAILURE TO FOLLOW
THESE INSTRUCTIONS CAN RESULT IN INJURY OR DEATH.

THIS SYMBOL MEANS

ATTENTION

BECOME ALERT

YOUR SAFETY IS INVOLVED!

SIGNAL WORDS

Note use following signal words DANGER,
WARNING, and CAUTION with safety messages.

Appropriate signal word for each has been selected
using following guidelines:

DANGER:

Indicates an imminently hazardous situation that,
if not avoided, will result in death or serious injury.
This signal word is to be limited to most extreme
situations typically for machine components which,
for functional purposes, cannot be guarded.

WARNING:

Indicates a potentially hazardous situation that, if
not avoided, could result in death or serious injury,
and includes hazards that are exposed when
guards are removed. It may also be used to alert
against unsafe practices.

CAUTION:

Indicates a potentially hazardous situation that, if
not avoided, may result in minor or moderate injury.
It may also be used to alert against unsafe
practices.

If you have questions not answered in this manual, require additional copies, or if your manual is damaged,
please contact your dealer or Dethmers Mfg. Co., P.O. Box 189, 4010 320th Street, Boyden, IA 51234
ph: [phone] or [phone] Toll Free: 1-800-543-3626 Fax: [phone]

http://www.demco-products.com

Page 5

SAFETY...YOU CAN LIVE WITH IT

EQUIPMENT SAFETY GUIDELINES

Every year many accidents occur which could have been avoided by a few seconds of
thought and a more careful approach to handling equipment. You the operator, can avoid
many accidents by observing and following precautions in this section. To avoid personal
injury, study the following precautions and insist those working with you, or you yourself,
follow them.

In order to provide a better view, certain illustrations in this manual may show an assembly
with a safety shield removed. However, equipment should never be operated in this condition.
Keep all shields in place. If shield removal becomes necessary for repairs, replace shield
prior to use.

Replace any caution, warning, danger or instruction safety decal that is not readable or is
missing. Location of such decals is indicated in this booklet.

Do not attempt to operate this equipment under the influence of alcohol or drugs.

Review safety instructions with all users.

Operator should be a responsible adult.

ASSEMBLE THIS UNIT UNTIL THEY HAVE DEVELOPED A THOROUGH UNDERSTANDING OF
SAFETY PRECAUTIONS AND HOW IT WORKS.

Do not paint over, remove, or deface any safety signs or warning decals on your equipment.
Observe all safety signs and practice instructions on them.

Never exceed limits of a piece of machinery. If its ability to do a job, or to do so safely is in
question-DON'T TRY IT.

DO NOT ALLOW PERSONS TO OPERATE OR

Page 6