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: (712) 725-2311 • Toll Free: 1-800-543-3626 • FAX: 1-800-845-6420
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 800-845-6420
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: (712) 725-2311 or (712) 725-2302 Toll Free: 1-800-543-3626 Fax: (712) 725-2380
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
SAFETY SIGN LOCATIONS
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.
DRUM BRAKES
This decal is located in the
position shown on both
sides of the actuator. The
replacement part number
for two decals is BH21004.
DISC BRAKES
Preset
Fasteners
DO NOT adjust
without
factory
specifications.
ATTENTION
This brake actuator is
specially designed for
This decal is located in the
position shown on both
sides of the actuator. The
replacement part number
for one decal is BD21001.
Page 7
use with disc brakes
ONLY.
Any replacement of
this unit MUST be of
thesame design.
REV 1 BD21001
SAFETY SIGN CARE
• Keep safety signs clean and legible at all times.
• Replace safety signs that are missing or have become illegible.
• Replacement parts that displayed a safety sign should also display safety sign.
• Safety signs are available from your distributor, dealer parts department, or factory.
How to install safety signs:
• Be sure that installation area is clean and dry.
• Decide on exact position before you remove backing paper.
• Remove smallest portion of split backing paper.
• Align decal over specified area and carefully press small portion with exposed sticky
backing in place.
• Slowly peel back remaining paper and carefully smooth remaining portion of decal into
place.
• Small air pockets can be pierced with a pin and smoothed out using piece of decal
backing paper.
REMEMBER
Your best assurance against accidents is a careful and responsible operator. If there is any
portion of this manual or function you do not understand, contact your local authorized dealer
or manufacturer.
Page 8
BEFORE OPERATION:
• Carefully review and follow the installation instructions on page 16 of this manual.
• Carefully study and understand this manual.
• Always wear protective clothing and substantial shoes.
• Give equipment a visual inspection for any loose bolts, worn parts, or cracked welds, and
make necessary repairs. Follow maintenance safety instructions included in this manual.
• Be sure there are no tools lying on or in equipment.
• Do not use equipment until you are sure that area is clear, especially around children and
animals.
• Don't hurry learning process or take equipment for granted. Ease into it and become familiar
with your new equipment.
• Practice operation of your equipment and its attachments. Completely familiarize yourself
and other operators with its operation before using.
• Make sure that brakes are evenly adjusted.
• Make sure tow rating on vehicle is high enough for what it is towing. Refer to your towing
vehicle Owners Manual.
• Do not allow anyone to stand between tongue or hitch and towing vehicle when
backing up to equipment.
• Securely attach to towing vehicle. Use appropriately sized hitch ball and/or hitch pin with a
mechanical retainer and attach safety chains.
• Criss cross chains under tongue and secure to draw bar cage, mounting loops,
or bumper frame.
DURING OPERATION
• SAFETY CHAINS If equipment is going to be transported on a public highway, safety
chains should be obtained and installed. Always follow state and local regulations
regarding safety chains and auxiliary lighting when towing equipment on a public highway.
Be sure to check with local law enforcement agencies for your own particular regulations.
Only safety chains (not an elastic or nylon/plastic tow straps) should be used to retain
connection between towing and towed equipment in event of separation of primary
attaching system.
• Install safety chains by criss crossing chains under tongue and secure to draw bar cage,
mounting loops, or bumper frame.
Page 9
• Beware of bystanders, PARTICULARLY CHILDREN! Always look around to make sure it is
safe to start engine of towing vehicle or move equipment. This is particularly important with higher
noise levels, as you may not hear people shouting.
• NO PASSENGERS ALLOWED- Do not carry passengers anywhere on or in equipment.
• Do not clean, lubricate, or adjust your equipment while it is moving.
• When halting operation, even periodically, set towing vehicles parking brake, shut off engine,
and remove the ignition key.
• Be extra careful when using on inclines.
• OPERATE TOWING UNIT CAUTIOUSLY. REDUCE SPEED TO ALLOW FOR ADDITIONAL
WEIGHT OF TOWED UNIT.
• Avoid loose gravel, rocks, and holes, they can be dangerous for equipment operation or movement.
• Allow for overall length when making turns.
• Keep all bystanders and pets clear of work area.
• Operate towing vehicle from operators seat only.
• Never leave running equipment attachments unattended.
• As a precaution, always recheck hardware on equipment following every 100 hours or 50 miles.
Correct all problems. Follow maintenance safety procedures.
Page 10
FOLLOWING OPERATION
• Following operation, or when unhitching, stop towing vehicle, set brakes,
shut off the engine and remove ignition key.
• Store unit in an area away from human activity.
• Do not permit children to play on or around stored unit.
• Make sure all parked units are on a hard, level surface and engage all safety devices.
• Wheel chocks may be needed to prevent unit from rolling.
HIGHWAY AND TRANSPORT OPERATIONS
• Adopt safe driving practices:
- Always drive at a safe speed relative to local conditions and ensure that your speed is low
enough for an emergency stop.
- Reduce speed prior to turns to avoid risk of overturning.
- Always keep towing vehicle in gear to provide engine braking when going downhill. Do not
coast.
- Do not drink and drive!
• Comply with state and local laws governing highway safety on public roads.
• Use approved accessory lighting, flags and necessary warning devices to protect operators of
other vehicles on highway during transport. Various safety lights and devices are available
from your dealer.
• Local laws should be checked for all highway lighting and marking requirements.
• Plan your route to avoid heavy traffic.
• Be a safe and courteous driver. Always yield to oncoming traffic in all situations, including narrow
bridges, intersections, etc.
• Be observant of bridge loading ratings. Do not cross bridges rated lower than the gross weight
at which you are operating.
Page 11
• Watch for obstructions overhead and side to side while transporting.
• Always operate equipment in a position to provide maximum visibility at all times. Make
allowances for increased length and weight of equipment when making turns and/or stopping.
PERFORMING MAINTENANCE
• Carefully review and follow the maintenance instructions on page 17 of this manual.
• Good maintenance is your responsibility. Poor maintenance is an invitation to trouble.
• Make sure there is plenty of ventilation. Never operate engine of towing vehicle in
a closed building. Exhaust fumes may cause asphyxiation.
• Before working on this unit, stop towing vehicle, set parking brakes, shut off engine
and remove ignition key.
• Be certain all moving parts and attachments have come to a complete stop before
attempting to perform maintenance.
• Always use safety supports and block wheels. Never use a jack to support unit.
• Always use proper tools or equipment for job at hand.
• Use extreme caution when making adjustments.
• Follow torque chart in this manual when tightening bolts and nuts.
• Openings in skin and minor cuts are susceptible to infection from brake fluid.
Without immediate medical treatment, serious infection and reactions can occur.
• Replace all shields and guards after servicing and before moving.
• After servicing, be sure all tools, parts and service equipment are removed.
• Do not allow grease or oil to build up on the actuator.
• When replacing bolts, refer to owners manual.
• Refer to bolt torque chart for head identification marking.
• Where replacement parts are necessary for periodic maintenance and servicing,
genuine factory replacement parts must be used to restore your equipment to original
specifications. Manufacturer is not responsible for damages resulting from use of unapproved parts or accessories.
• If equipment has been altered in any way from original design, manufacturer does
not accept any liability for injury or warranty.
• A fire extinguisher and first aid kit should be kept readily accessible while performing
maintenance on this equipment
Page 12
BOLT TORQUE
TORQUE DATA FOR STANDARD NUTS, BOLTS, AND CAPSCREWS.
Tighten all bolts to torques specified in chart unless otherwise noted. Check tightness of bolts
periodically, using bolt chart as guide. Replace hardware with same grade bolt.
NOTE: Unless otherwise specified, high-strength Grade 5 hex bolts are used throughout assembly
of equipment.
Bolt Torque for Standard bolts *
Torque Specifications
Torque figures indicated are valid for
non-greased or non-oiled threads and
heads unless otherwise specified.
Therefore, do not grease or oil bolts or
capscrews unless otherwise specified
in this manual. When using locking
elements, increase torque values
by 5%.
* GRADE or CLASS value for bolts
and capscrews are identified by their
head markings.
GRADE 2 GRADE 5 GRADE 8
“A” lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
1/4” 6 (8) 9 (12) 12 (16)
5/16” 10 (13) 18 (25) 25 (35)
3/8” 20 (27) 30 (40) 45 (60)
7/16” 30 (40) 50 (70) 80 (110)
1/2” 45 (60) 75 (100) 115 (155)
9/16” 70 (95) 115 (155) 165 (220)
5/8” 95 (130) 150 (200) 225 (300)
3/4” 165 (225) 290 (390) 400 (540)
7/8” 170 (230) 420 (570) 650 (880)
1” 225 (300) 630 (850) 970 (1310)
Bolt Torque for Metric bolts *
CLASS 8.8 CLASS 9.8 CLASS 10.9
“A” lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
6 9 (13) 10 (14) 13 (17)
7 15 (21) 18 (24) 21 (29)
8 23 (31) 25 (34) 31 (42)
10 45 (61) 50 (68) 61 (83)
12 78 (106) 88 (118) 106 (144)
14 125 (169) 140 (189) 170 (230)
16 194 (263) 216 (293) 263 (357)
18 268 (363) -- -- 364 (493)
20 378 (513) -- -- 515 (689)
22 516 (699) -- -- 702 (952)
24 654 (886) -- -- 890 (1206)
GRADE-2 GRADE-5 GRADE-8
CLASS 8.8 CLASS 9.8 CLASS 10.9
8.8
Page 13
9.8
10.9
26
8605001 DRUM BRAKE
ACTUATOR PARTS
Do not tighten these bolts. They are
factory torqued and must remain loose
enough to allow free coupler movement.
13
25
5398 Master Cylinder Repair Kit
(gasket 09153 included)
not included
for
6000 lb.
coupler
5696
Coupler Repair Kit
19
19
22
20
18
23
27
25
10
6
6
12
11
14
21
7
7
1
4
17
9
15
16
8
28
3
2
ACTUATOR PARTS LIST
REF.
NO. PART NO. QTY. DESCRIPTION
1. 12190-95 1 6000# 2" Lever Lock Coupler
2. SB23278 2 Roller
3. 12151 2 Front Roller Spacer
4. 02166 1 3/8”-16UNC X 2-3/7” Hex Head Bolt (gr.5)
5. 07176 1 3/8”-16UNC Stover Lock Nut
6. 05684 2 1/2"-13UNC x 4-7/16" Hex Head Bolt (gr.5)
7. 02178 2 1/2"-13UNC Nylon Insert Lock Nut
8. 12193 1 Push Rod Assembly
9. 05692 1 Damper/ Shock
10. 12103 2 Rear Roller Spacer
11. *05951 1 Emergency Lever
12. 12201-95 1 Front Cover
13. *12200 1 28” Cable with S-Hook & J-Hook
14. SB10555 2 Replacement S-Hook ONLY
15. 05960 2 5/16"-18UNC x 1/2" Self-Tapping Screw
16. 05424 2 5/16" External Tooth Lock Washer
17. *05693-95 1 Emergency Lever Spring
18. 03876 1 Master Cylinder Cap w/ Diaphragm & O-ring
19. **00618 4 1/4-20UNC x 2.00" Hex Head Bolt
20. **00057 4 1/4” Spring Lock Washer
21. 12191-95 1 Outer Case
22. **09153 1 Replacement Master Cyl. Gasket ONLY
23. **10616 1 Master Cylinder (Not sold separately)
5650 - Master Cylinder Drum Kit(incl. items w/
24. SB12098 1 Orifice
25. 05687 1 Master Cylinder Protective Boot
26. BH21004 1 Safety Decal (See Page 6)
27. **00062 4 1/4-20UNC Nut
28. 02384 2 1/2” X 14 Gage Machine Washer
- 5400- Emergency Lever Replacement Kit (incl. items w/*)
- 5398 - Master Cylinder Repair Kit w/ gasket
- 5696 - Coupler Repair Kit (lever lock)
Please order replacement parts by PART NO. and DESCRIPTION.
Page 14
24
27
**)
29
8605101 DISC BRAKE
ACTUATOR PARTS
26
Do not tighten these bolts. They are
factory torqued and must remain loose
enough to allow free coupler movement.
25
5482 Master Cylinder Repair Kit
(gasket 09153 included)
not included
for
6000 lb.
coupler
13
12
18
19
20
10
19
28
25
6
6
ACTUATOR PARTS LIST
11
14
21
7
7
1
4
REF.
NO. PART NO. QTY. DESCRIPTION
15
16
17
8
9
2830
3
2
1. 12190-95 1 6000# 2" Lever Lock Coupler
2. SB23278 2 Roller
3. 12151 2 Front Roller Spacer
4. 02166 1 3/8”-16UNC X 2-3/7” Hex Head Bolt (gr.5)
5. 07176 1 3/8”-16UNC Stover Lock Nut
6. 05684 2 1/2"-13UNC x 4-7/16" Hex Head Bolt (gr.5)
7. 02178 2 1/2"-13UNC Nylon Insert Lock Nut
8. 12193 1 Push Rod Assembly
9. 05692 1 Damper/ Shock
10. 12103 2 Rear Roller Spacer
11. *05951 1 Emergency Lever
12. 12201-95 1 Front Cover
13. *12200 1 28” Cable with S-Hook & J-Hook
14. SB10555 2 Replacement S-Hook ONLY
15. 05960 2 5/16"-18UNC x 1/2" Self-Tapping Screw
16. 05424 2 5/16" External Tooth Lock Washer
17. *05693-95 1 Emergency Lever Spring
18. 03876 1 Master Cylinder Cap w/ Diaphragm & O-ring
19. **00618 4 1/4-20UNC x 2.00" Hex Head Bolt
20. **00057 4 1/4” Spring Lock Washer
21. 12191-95 1 Outer Case
22. **09153 1 Replacement Master Cyl. Gasket ONLY
23. **11190 1 Master Cylinder (Not sold separately)
- 5672 - Master Cylinder Disc Kit (incl. items w/
24. 11993 1 Inline Blocking Solenoid
25. 05687 1 Master Cylinder Protective Boot
26. BH21004 1 Safety Decal (See Page 7)
27. **00062 4 1/4-20UNC Nut
28. 11674-95 1 Solenoid Cover
29. BD21001 2 Disc Brakes Decal (See Page 7)
30. 02384 2 1/2” X 14 Gage Machine Washer
31. 07283 1 10mm Flat washer
22
27
31
23
24
27
**)
5696
Coupler Repair Kit
- 5400- Emergency Lever Replacement Kit (incl. items w/*)
- 5482 - Master Cylinder Repair Kit w/ gasket
- 5696 - Coupler Repair Kit (lever lock)
Please order replacement parts by PART NO. and DESCRIPTION.
Page 15
DEMCO MODEL DA66B BRAKE ACTUATOR
WARNING
• Review all of the 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 which could cause severe property damage,
personal injury or death.
WARNING
CAUTION
To Prevent Serious Injury Or Death:
To avoid personal injury or death, do not exceed lowest of (1) the rated
capacity of Model DA66B actuator, or (2) rated capacity of ball and hitch
being used, or (3) trailer's Gross Vehicle Weight Rating (GVWR).
Model DA66B brake actuator has a maximum load rating of 6000 lbs.
GVWR and 600 lbs. tongue load.
To avoid personal injury or death Do not weld on the outer case without
disassembling actuator. The excessive heat may cause the actuator not
to function properly
INSTALLATION
The Model DA66B is completely assembled and ready to bolt into place.
1. Bolt the actuator to 3" square tongue with two 1/2" x 4-1/2" bolts Gr.5 and 1/2" nylon insert lock nuts.
Thin wall tongues require 3/4" O.D. x 11 gauge wall tubing as spacers inside the tongue. Tighten
bolts to 75 - 80 ft. lbs. torque. Make sure coupler is free to telescope inside of outer case.
2. Connect and tighten all brake lines.
3. Fill the Master Cylinder (#23) with DOT 3 or 4 brake fluid.
4. Bleed the brake system using a pressure-type brake bleeder or manually, as follows:
a. Remove the two Self-Tapping Screws (#15) and Lock Washers (#16) that hold the flat
Emergency Lever Spring (#17). Remove the Emergency Lever Spring. Using short strokes, pull
forward on the Emergency Lever (#11), pumping the Master Cylinder until the brake fluid within
the Master Cylinder stops bubbling.
b. Attach a bleeder hose to the bleeder valve on one of the wheels and submerge the other end
of the hose into a clean, transparent container partially filled with brake fluid. Loosen the bleeder
valveone turn and, watching the hose in the transparent container, use the Emergency Lever
to pump the Master Cylinder as long as air bubbles continue to leave the hose. When the
bubbles stop, close the bleeder valve, move to the next wheel, and repeat the process until all
the brakes have been bled. (Note: Check the fluid level in the Master Cylinder frequently while
bleeding the brakes (every 4 or 5 strokes). Refill as necessary to keep the level above half full.)
Page 16
5. Once bleeding is completed, refill master cylinder to within 1/2” of top. and attach cap (#18)
securely. Replace emergency lever spring, lever guide, lock washers and 5/16" hex head
bolts. Wipe up any excess brake fluid immediately to prevent paint damage.
6. Test brakes by pulling emergency lever (#11) forward until it locks into its second notch
position. (Lever should be approximately straight up.) Attempt to rotate wheels in a forward
direction. If any wheels rotate, brakes must be adjusted. To adjust brakes, release
emergency lever from locked position, set each wheels brake adjustment up 2 or 3 notches
(per instructions in appropriate brake cluster manual). Repeat test procedure as necessary.
MAINTENANCE
1. Frequently check brake fluid level. (Fluid must be approved, clean and uncontaminated.)
2. Make sure actuator mounting bolts are secure, and coupler is free to telescope inside outer case.
3. Inspect actuator, replace bent, worn or damaged parts.
4. Be constantly aware of systems braking quality, make periodic checks as described in brakes owners
manual. Consult certified brake specialist to make necessary adjustments or repairs. Failure to do so
could result in loss of braking.
SERVICING THE EMERGENCY LEVER
If emergency lever (#11) of actuator is applied, it can be disengaged by using a screwdriver to lift
upward on front of flat emergency lever spring (#17) while pulling lever forward until released.
A thorough inspection of emergency lever, emergency lever spring, and cable with S-hooks is required.
Damaged parts must be replaced as follows:
a. Using two wrenches, loosen brake line from fitting (#24) at back of master cylinder (#23). Take
care not to allow fitting to become loose in master cylinder.
b. Remove cable S-hook (#14) from emergency lever (#11).
c. Remove two bolts (#15) and emergency lever spring (#17).
d. Press pushrod assembly (#8) rearward to allow emergency lever (#11) to pass by and remove it
through cross slot in top of outer case (#21).
e. To install new emergency lever, press pushrod assembly rearward and hold it there, while putting
emergency lever through cross slot in top of outer case. Emergency lever should overlap front of
pushplate when assembled properly.
f. Install new emergency lever spring (#17) with bend upward, using two new self tapping bolts
(#15).
g. Install emergency cable with S-hook (#13) by inserting S-hook through hole in emergency lever
(#11) and squeezing hook shut.
h. Tighten fitting (#24) and brake line. Make sure to use two wrenches, so fitting isn’t overtightened
in master cylinder.
i. Add brake fluid if necessary and bleed brake system as described per instructions 4-6 in
the installation instructions.
Page 17
DEMCO BRAKE PRODUCTS - LIMITED WARRANTY
1. Extent and Duration of this Warranty:
Your Demco brake product is warranted to be free from defects in materials and workmanship under normal use
and service for a period of one year after date of purchase by original owner when properly installed, used and
maintained by purchaser.
When this Demco brake product is used as part of complete Demco braking system (actuators, brake lines, and
back plates), Demco warrants system to be free from defects in materials and workmanship for two years when
properly installed, used, and maintained by purchaser.
Any part of Demco brake system found to be defective in materials or workmanship will be repaired or replaced at
manufacturers option without charge for parts or labor to original owner.
2.
3.
Manufacturer and Warrantor of Brake Actuator:
Dethmers Manufacturing Co.
4010 320th Street
P.O. Box 189
Boyden, IA 51234
(712) 725-2311
Repair or Replacement Procedure:
If your Demco brake product develops a defect during warranty period, promptly notify Dethmers Manufacturing
Co. customer service department. Until such notice is received, warrantor will not be responsible for any repair or
replacement.
Upon receipt of timely notice from you, warrantor will have a choice of options in replacing any part it determines
to be defective:
a) Warrantor may require you at your own expense to deliver or ship part to its factory or authorized
dealer. Any defective part will be repaired or replaced and returned to you or your authorized dealer
free of charge. Any part returned to warrantor and found not to be defective will be returned to you
freight collect with explanation.
b) Warrantor may ship a new part to dealer to be exchanged free of charge for defective
part returned by you.
c) Warrantor may ship or deliver a replacement part to you at your address.
4. Limitations on Warranty Coverage:
Coverage under this warranty will be effective only when a copy of original invoice, showing date and location of
purchase, accompanies any claim for warranty.
Warrantor has no liability whatsoever and this warranty is null and void if any Demco brake product has been
misassembled or subjected to damage or neglect, negligence, misuse, accident or operated in any way contrary
to operating and maintenance instructions as specified in Demco owners manual for that product.
This warranty does not cover any product that has been altered or modified so as to affect the product’s
operation, performance or durability, or that has been modified to change intended use of product.
In addition, warranty does not extend to repairs made necessary by abnormal use, damage, unreasonable
use including failure to provide reasonable and necessary maintenance, or by use of parts, accessories or
other equipment which are incompatible with Demco brake products or affect its operation, performance
or durability.
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DEMCO BRAKE PRODUCTS - LIMITED WARRANTY CONTINUED
This warranty does not cover:
1) normal wear and tear.
2) road film or gravel damage to paint.
3) paint.
4) rust damage.
5) any Demco brake product that has been loaded in excess of load capacity stated on identification
label.
6) Accessory parts, materials or components.
Warrantor has a policy of continuous product improvement. We reserve the right to change or
improve design of any Demco brake product, including but not limited to state of the art changes,
without assuming any obligation to modify any product previously manufactured.Warrantor
assumes no responsibility to owner for loss of use of product, loss of time, inconvenience or
other damage consequential or otherwise, including, but not limited to expense for gasoline,
expense of transporting product to dealer and expense of returning product, mechanics travel
time, telephone, telegram, fax, overnight delivery, or postage charges, road service/towing
charges, rental during time warranty repairs are being performed, travel, lodging, loss or damage
to personal property or loss of revenue or earnings.
5. Limitations of Implied Warranties:
All implied warranties, if any, expire and terminate upon expiration of this warranty. Some states
do not allow limitation on how long an implied warranty lasts, so this limitation may not apply to
you.
6. Limitation of Consequential Damages:
Warrantor’s responsibility under this warranty extends solely to repair or replacement of your
Demco brake product and its component parts. Warrantor does not assume responsibility for, nor
shall it be liable for, any special, incidental or consequential damages. Some states do not allow
exclusion or limitation of incidental or consequential damages, so above exclusion or limitation
may not apply to you.
7. Purchasers Rights:
This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
8. Exclusive Warranty:
This is the only express warranty made by Dethmers Manufacturing Co. on your Demco product
and no agent, employee, or other person is allowed to change or add to this warranty.This war
ranty extends solely to repair or replacement of your Demco brake product and its component
parts. Warrantor does not assume any liability or responsibility not expressly covered by this
limited warranty.This warranty supersedes all prior warranties, written or implied.
DISCLAIMER
No other express warranty has been made or will be made on behalf of warrantor with respect to
Demco brake product or its instruction, operation, repair or replacement.Warrantor shall not be
responsible for damage, loss or damage to personal property, whether direct or indirect, and
whether arising in contract or tort.
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DETHMERS MFG. COMPANY
P.O. BOX 189
4010 320th St., BOYDEN, IA. 51234
PH: (712) 725-2311 FAX: (712) 725-2380
TOLL FREE: 1-800-54DEMCO (1-800-543-3626)
www.demco-products.com
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