SAE J1817:2018 pdf free

SAE J1817:2018 pdf free.Long-Stroke Air-Brake Actuator Marking
Long-stroke air-brake actuators have pushrod stroke capabilities in excess of standard stroke actuator designs. As some of these actuators are nearly identical in exterior appearance to the standard actuators, a unique marking system is needed for the purpose of identification by mechanics, inspectors, and others in the field. This marking will help assure both types of actuators are serviced correctly and that brakes are adjusted properly. Unique long-stroke actuator components are not interchangeable between actuator manufacturers nor standard actuator components.
There are four (4) methods described as follows, for differentiating long-stroke from standard stroke actuators. All long-stroke actuators must have a letter code marking per 5.1.1 and 76.2 mm (3.00 inches) long-stroke actuators must use square inlet ports per 5.1.2. AlI long stroke actuators should incorporate at least one (1) of the other two (2) methods per 5.1.3 and 5.1.4.
Marking on spring housing or service side pressure housing in accordance with SAE J2899 with letter code corresponding to air brake actuator rated stroke (see Figure 1).
AlI 76.2 mm (3.00 inches) long-stroke actuators shall have square inlet ports. The top port of the service actuators shall have a square embossment that is clearly visible and cannot be obscured by paint or square port can be used (see Figures 1 and 2).
Service instructions should be embossed or stamped on spring brake center sections or service side pressure caps. These instructions will instruct that long-stroke diaphragms are required for replacement. Numerical values shall be in mm and inches (see Figures 1 and 2).
A tag (typically trapezoidal) shall be secured to the service side clamp band bolts or attached/affixed to the actuator by a suitable means. The actuators rated stroke shall be embossed or otherwise readable within the trapezoidal area with numerical values in millimeters and inches. For actuators without clamp bands, the same information is to be provided in a highly visible alternative directly on the actuator (see Figures 1 and 2).SAE J1817 pdf free download.