4/15 BH20022, Rev 15 Page 1
DEMCO MODEL DA10 ACTUATOR Model DA10 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.
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 warning: Note use following signal words DANGER, WARNING, and Indicates a potentially hazardous situation that, if not avoided, CAUTION with safety messages.
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. This decal positioned as shown BRAKES ON BRAKES OFF DO NOT TOW TOWABLE BH21003 Part # BH21003 Safety sign care • Keep safety signs clean and legible at all times.
Before operation: • 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.
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.
• 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.
WARNING: To Avoid Personal Injury or Property Damage, Observe THE Following Instructions: The weight rating of the coupler is dependent on the correct bolts being used. You must use the exact size, grade and number of bolts specified in the manual. Mounting hardware can be obtained from Demco, trailer parts distributors or fastener supplier.
Free Backing Solenoid Kit Options Drill the hole using a 5/32” bit. Hole location is .900” right of top left corner and .900” down from top of master cylinder. Tap hole with 10-32 NF tap. 32 35 KIT #5750 PARTS LIST FIELD INSTALL BYPASS REF. PART NO. NO. QTY. DESCRIPTION 31. 04594 - EPDM Black Tubing 32. 05561 1 Bypass Solenoid Valve 33. 11674-95 1 Solenoid Cover 34. 10373 1 Brass Fitting Str. .2 HB x 10-32 NF 35. 10374 2 Crimp Clamp 36. 10375 1 Straight Nipple 1/8” MPT x 1/8” MPT 37.
MODEL DA10 ACTUATOR PARTS BREAKDOWN Item Part # Description Qty 18 5650 Composite Master Cyl. Kit (drum brakes) 1 1 00057 Washer, .25 Spring Lock 4 - 5672 Composite Master Cyl. Kit (disc brakes) - 2 00062 Nut .25nc Hex 4 - 5783 1.25” Bore Aluminum Master Cyl. Kit Disc 4 00618 Bolt, .25 Nc X 2.00 Hex Head Gr.
OUTER CASE OPTIONS AND AVAILABLE HITCH CONFIGURATIONS 33 WARNING: To Avoid 34 35 Personal Injury or Property Damage, Observe THE Following Instructions: The weight rating of the coupler is dependent on the correct bolts being used. You must use the exact size, grade and number of bolts specified in the manual. Mounting hardware can be obtained from Demco, trailer parts distributors or fastener suppliers.
BC20020 REV 0 eZ-Latch Coupler Operation 2" & 2 5/16" Couplers (4) 5/8" Grade 5 Bolts are required with channel mounted 2" & 2 5/16" couplers (1) eZ-Latch couplers do not require users to lift the handle for the coupler to engage the ball. Position the ball in the center of the ball socket or slightly forward, then begin to lower the coupler with the jack on the trailer.
• • • WARNING DEMCO MODEL DA10 BRAKE ACTUATOR To Prevent Serious Injury Or Death: 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.
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 (#10) while pulling lever forward until released. A thorough inspection of emergency lever, emergency lever spring, and safety cable is required. Damaged parts must be replaced as follows: A.
Rue Ring Installation To install Rue Ring, place straight wire of Rue Ring through hole in pin as shown in illustrations ( Figure B 1- 2) Next, using a pliers, twist end of Rue Ring so the straight wire crosses over top of the bent wire. ( Figure B 3) Figure B illustration 4 shows removal of Rue Ring. Uncross wires, then while lifting the bent wire, pull on loop end of the Rue Ring to remove from pin. Figure A Figure B Install into hole. Pin installed. Bent leg behind straight leg.
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 Go online to www.demco-products.com for Demco warranty policies & product registration.
