Demco DA20 User Manual

Dethmers Manufacturing CompanyDethmers Manufacturing Company

Dethmers Manufacturing Company

Dethmers Manufacturing CompanyDethmers Manufacturing Company

DOING OUR BEST TO PROVIDE YOU THE BEST

DA20

ACTUATOR

OPERATORS MANUAL

3-23-01

BH20001, Rev 5

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

www.demco-products.com

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NOTES

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DEMCO MODEL DA20 ACTUATOR

Model DA20 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 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 ............................................................................................................3

Safety , Signal W ords ..........................................................................................................4

Equipment Safety Guidelines .............................................................................................5

Safety Sign Locations.........................................................................................................6

Safety Sign Care ................................................................................................................7

Remember .........................................................................................................................7

Before Operation ................................................................................................................8

During Operation .............................................................................................................. 8-9

Following Operation...........................................................................................................10

Highway and Transport Operations ................................................................................ 10-1 1

Performing Maintenance ................................................................................................... 11

Bolt T orque ........................................................................................................................12

DA20 Parts Breakdown and Parts List ..............................................................................13

DA 20 Outer Case Options ................................................................................................14

Actuator Installation and Maintenance............................................................................ 15-16

Demco Brake Products Limited Warranty..........................................................................17

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

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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

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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. DO NOT ALLOW PERSONS TO OPERATE OR

ASSEMBLE THIS UNIT UNTIL THEY HA VE DEVELOPED A THOROUGH UNDERST ANDING 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.

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SAFETY SIGN LOCATIONS

BRAKES ON

DO NOT TOW

BRAKES OFF

TOWABLE

10/99 BH21003

Types of safety sign and locations on equipment are shown in illustration below. Good safety
requires that you familiarize yourself with various safety signs, type of warning, and area or
particular function related to that area, that requires your SAFETY AWARENESS.

This decal positioned as shown

Part # BH21003

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