-04 BH20023, Rev 1 DOING OUR BEST TO PROVIDE YOU THE BEST MODEL 91 BRAKE ACTUATORS OWNER/OPERATOR MANUAL READ complete manual CAREFULLY BEFORE attempting operation. ASSEMBLY CALIBRATION OPERATION REPLACEMENT PARTS 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.
DEMCO MODEL DA91 ACTUATOR 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 towing vehicle hard and brakes on trailer are applied hard. Master cylinder push rod spring assembly protects system from hydraulic pressure overload.
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 is positioned as shown BRAKES ON BRAKES OFF DO NOT TOW TOWABLE BH21003 Replacement Part #BH21003 Qty.
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 A GRADE 2 lb-ft (N.m) GRADE 5 lb-ft (N.m) GRADE 8 lb-ft (N.
! 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 bolts provided with the product. If you are missing bolts, refer to your Operatorís Manual and obtain replacements from Demco, or use the exact size, grade, and number of bolts as specified.
WARNING DEMCO MODEL DA91 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.
5. Once bleeding is completed, refill master cylinder and attach cap (#17) securely. Replace emergency lever spring, lever guide, lock washers and 5/16" hex head bolts. 6. Test brakes by pulling emergency lever (#16) 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.
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.
DEMCO BRAKE PRODUCTS - LIMITED WARRANTY CONTINUED This warranty does not cover: a) normal wear and tear. b) road film or gravel damage to paint. c) paint. d) rust damage. e) any Demco brake product that has been loaded in excess of load capacity stated on identification label. f) Accessory parts, materials or components. Warrantor has a policy of continuous product improvement.
ACTUATOR PARTS BREAKDOWN 13 8 8 23 5398 Master Cylinder Repair Kit (drum) 17 **12 **10 (gasket 09153 included) **16 14 14 15 15 18 25 9 5482 Master Cylinder Repair Kit (disc) 11 26 (gasket 09153 included) not included 6 2î Ball Coupler RATED AT 6000# 4 20 9 7 22 28 21 2 5 4 29 5 19 24 28 2 19 27 1 9 3 5221 Coupler Repair Kit Optional Drop Tube Slider (OPTIONAL) FREE BACKING SOLENOID KIT PARTS BREAKDOWN 5404 (FIELD INSTALL) 5629 (FACTORY INSTALL) Model 91 ACTUATOR PARTS
OUTER CASE OPTIONS AND AVAILABLE HITCH CONFIGURATIONS 37 38 39 40 41 42 45 46 43 55 56 54 51 54 43 47 48 44 RATED AT 8000# 54 53 56 RATED AT 8000# 44 54 57 54 2 RATED AT 7000# 2 -5/16 RATED AT 8000# 54 56 56 52 2 RATED AT 7000# 2 -5/16 RATED AT 8000# 58 56 49 50 59 54 RATED AT 6000# ! 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.
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.
