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1-04
BH20023, Rev 1
DOING OUR BEST TO PROVIDE YOU THE BEST
MODEL 91
BRAKE ACTUATORS
OWNER/OPERATOR MANUAL
ASSEMBLY
READ complete manual CAREFULLY
CALIBRATION
BEFORE attempting operation.
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.com
Page 1
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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. WARNING: To Prevent Serious Injury or De
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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. 1 Page 3
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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 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 (
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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 miss- ing bolts, refer to your Operatorís Manual and ob- tain replacements from Demco, or use the exact size, grade, and number of bolts as specified. Us- ing the wrong size, grade, or number of bolts will reduce the weight rating of the coupler and could cause s
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DEMCO MODEL DA91 BRAKE ACTUATOR To Prevent Serious Injury Or Death: 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. Model DA91 brake actuator has a
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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. To adjust brakes, release emergency lever from locked position, set each wh
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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 mat
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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 identifica- tion label. f) 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
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ACTUATOR PARTS BREAKDOWN 13 8 8 23 17 5398 Master Cylinder **12 Repair Kit (drum) 18 **10 14 14 (gasket 09153 included) 15 15 **16 25 9 5482 Master Cylinder Repair Kit (disc) 11 26 (gasket 09153 included) 20 6 9 not included 7 2î Ball Coupler RATED AT 6000# 22 28 4 21 2 5 4 5 19 29 24 2 28 19 27 1 9 See Page 19 for additional Slider 3 5221 Tube and Outer Case options Optional Drop Tube Coupler Repair Kit Slider (OPTIONAL) FREE BACKING Model 91 ACTUATOR PARTS LIST SOLENOID KIT PARTS BREAK- REF. N
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OUTER CASE OPTIONS AND AVAILABLE HITCH CONFIGURATIONS 37 38 39 40 41 42 45 46 55 56 54 43 51 54 43 48 53 47 44 54 54 52 56 2 RATED AT 7000# 2 RATED AT 7000# 44 RATED AT 8000# RATED AT 8000# 2 RATED AT 8000# 2 RATED AT 8000# 54 54 56 56 58 57 56 49 50 59 54 54 RATED AT 6000# 2 RATED AT 8000# 2 RATED AT 8000# PARTS LIST WARNING: TO AVOID PERSONAL INJURY OR REF. PROPERTY DAMAGE, OBSERVE THE FOLLOWING NO. PART NO. QTY. DESCRIPTION 37. 11101-?? 1 Outer Case w/ no m
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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 Page 12
