BENDIX TCH-005-013 User's Manual
Contents
1. Technical Bulletin Bulletin No TCH 005 013b Effective Date 9 12 2011 Cancels TCH 005 013a dated 9 7 07 Page 1 of 1 Subject Brake Actuator Push Rod Qualifications for Use with Bendix ASA 5 and Bendix Versajust Slack Adjusters This Bulletin updates Bendix Commercial Vehicle Systems LLC guidelines for push rods used with Bendix ASA 5 and Bendix Versajust automatic slack adjusters Both these slack adjusters adjust the clearance between the brake linings and the drums during a brake application and require push rods with the following specifications to be used 1 For push rods up to eight 8 inches in length must be made with steel with strength that meets or exceeds SAE 1078 or equivalent grade based on the yield strength of the material See dimension A shown below Push rod length A is measured from the bottom of the actuator to the end of the push rod This dimension is taken with the spring brakes released or caged 2 Without exception in cases where longer push rods are necessary they must be made from steel with strength that meets or exceeds SAE 1035 or equivalent grade based on the yield strength of the material In these cases the push rod must be a minimum of 0 625 inch in diameter and only partially threaded i e Only threaded the first three to four inches at the end of the rod Diameter A WARNING Brake actuator push rods that do not meet these recommendations can be perman2. ently deformed by the forces generated during a braking application Bent brake actuator push rods may negatively affect the braking performance at the wheel end If you have further questions contact your Bendix Account Manager or call 1 800 AIR BRAKE Reference Materials See the following Bendix Service Data sheets available from the document library at www bendix com or from the Literature Center at the web site SD 05 1269 Bendix ASA 5 Automatic Slack Adjuster Bend SD 05 4630 Bendix Versajust Automatic Slack Adjuster SD 02 4525 Bendix EverSure Spring Brake bast 2011 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 9 11 All Rights Reserved
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