User manual HALDEX L30037 SERVICE MANUAL

[. . . ] The adjustment regulator rotates through the normal clearance angle and the brake is released. If lining wear has taken place the adjustment regulator advances the clutch wheel reducing the excess clearance during the release stroke. S-ABA Identification Part Number: 409-20_ _ _ = S-ABA Brake Adjuster Serial Number: First 3 digits = Day of year built Last 2 digits = Year of build The Part No. P/N40920002 would be our adjuster part number 409-20002. Part Number P/N40920002 Serial Number S/N26802 1 Typical Applications Steer Axle Figures 1 and 2 show typical brackets for automatic brake adjuster applications on steer axle brake assemblies. Refer to pages 4 and 5 for detailed installation procedures. Figure 1 Steer axle with clamp bracket and flat anchor stud Figure 2 Steer axle with strap bracket Drive Axle Figures 3 and 4 show typical brackets for automatic brake adjuster applications on drive axle brake assemblies. [. . . ] Check the following: Component Cause Action Camshaft Camshaft bushings Camshaft bushings Air chamber return springs Air chamber push rod Air system Shoe return springs Automatic brake adjuster Binding Excessive movement Binding shaft Broken, weak, missing Binding on chamber housing Not exhausting completely Broken, weak, missing Unknown Automatic brake adjuster Unknown Remove, replace, lubricate camshaft Remove and replace cam bushings per OEM specs Lubricate camshaft bushings or replace Replace chamber Check adjuster for proper shimming and air chamber position for proper adjuster arm length Check for cause of air problem and repair Replace springs Check automatic brake adjuster for proper installation. Refer to Installation Instructions on pages 4 & 5. Refer to Automatic Brake Adjuster Checking Procedures and Operational Check on pages 9 & 10. Free Stroke Below the Range If the free stroke is less than 3/8", a dragging brake can occur. Check the following: Component Cause Action Wheel bearing Automatic brake adjuster Out of adjustment Unknown Automatic brake adjuster Unknown Readjust per OEM specs Check automatic brake adjuster for proper control arm position. Refer to Installation Instructions on pages 4 & 5. Refer to Automatic Brake Adjuster Checking Procedures and Operational Check on pages 9 & 10. Free Stroke = B minus A Applied Stroke = C minus A (Fully Retracted) (Drum Contact Using a Lever) (Brake Application at 90-100 PSI reservoir pressure. ) A B C Figure 13 Stroke Measurements (taken from face of air chamber to center of clevis pin) 8 Automatic Brake Adjuster Checking Procedures If the brake adjuster is not maintaining the proper applied stroke, before removing the brake adjuster, check the condition of the foundation brake (see pages 7 & 8). If rotation of the adjustment hex is not observed, refer to Foundation Brake Operational Check and Troubleshooting Procedures on pages 7 & 8. If foundation brake assembly checks out okay and hex still does not turn, check control arm and mounting bracket for possible worn, bent or broken components. If the control arm and mounting bracket check out okay, replace the adjuster and hardware per Installation Instructions on pages 4 & 5. 9 Off Vehicle Inspection Component Adjuster not functioning properly Cause Low clutch torque Action Place adjuster arm in vise. Rotate the 7/16" adjustment hex counterclockwise one full turn to check de-adjustment torque. After control arm stops rotating, a minimum of 13 ft. will be required and a ratcheting sound will occur. Replace brake adjuster if the torque is less than 13 ft. or no de-adjustment ratcheting sound is present. Rotate the control arm counterclockwise until the control arm rotates to an INTERNAL STOP. If the arm slips freely, replace the brake adjuster. lbs. , scribe a line on the adjustment hex. Manually pull the brake adjuster control arm clockwise then push back counterclockwise. The hex will move in a clockwise direction when the control arm of the brake adjuster is pushed back counterclockwise. If adjuster has passed the above checks, re-install adjuster on vehicle, with new hardware. Control Arm slippage Unknown Worn/missing control arm wear bushing, and anchor stud pin, if applicable. Typical Parts Identification and Location Anchor Bracket Anchor Stud Pin Anchor Bracket Control Arm (Single Bend) Wear Bushing Anchor Stud Pin Adjustment Hex Nut Wear Bushing Control Arm 10 Torque Specifications Note: Tighten all fasteners to manufacturer's recommendations unless otherwise specified below. Flat Anchor Stud Pin Torque to 40-50 ft. when installed Round Anchor Stud Pin with Fabricated Ring Clamp Torque to 15-20 ft. when installed Round Anchor Stud Pin with Slide Nut Torque to 15-20 ft. [. . . ] Normal wear items like anchor stud pins and wear bushings are available. Refer to the Haldex Parts and Cross Reference Guide, L00090. Otherwise, contact Haldex Technical Assistance for the appropriate bracket kit at 1-800-643-2374. No. Completely check out foundation brake and adjuster to determine cause of problem. [. . . ]