Automann 139.2833 Automatic Slack Adjuster 5.5" Arm 1-1/2" 28-Spline Meritor Type B

The Automann 139.2833 is a premium aftermarket automatic slack adjuster designed for heavy-duty commercial truck air brake systems. This Meritor Type B stroke-sensing slack adjuster features a 5-1/2-inch straight arm length with 1-1/2-inch diameter and 28-spline input for S-cam shaft connection.

Key Specifications:

• Spline Configuration: 1-1/2" diameter, 28-spline count
• Arm Length: 5.5 inches (straight type)
• Clevis Thread: 5/8"-18 thread pitch
• Type: Automatic, Meritor Type B
• Sensing Method: Stroke-sensing design
• Position: Universal (fits left or right)
• Material: Ductile nodular iron construction

Features & Benefits:

• Automatically maintains proper brake shoe-to-drum clearance
• Eliminates the need for manual adjustment
• Ensures consistent braking performance
• Factory lubricated and sealed drilled worm wheel
• Unhanded design for left or right side installation
• No external mounting bracket required
• Includes 179.YK5005 clevis kit

Direct Replacement For: Meritor R802447, R803049, R802445, R802649, R803047, R803053, A413275A1145, A353275A1145, A473275A1145; Euclid E-11418; Dayton 05-3631. This slack adjuster is compatible with Class 6 through Class 8 trucks and trailers equipped with Meritor drum brake foundations using 1-1/2" 28-spline S-cam shafts.

Installation Notes: Always replace slack adjusters in axle pairs. Verify spline count, spline diameter, arm length, and clevis thread size before ordering. Replace if pushrod stroke exceeds adjustment limits, visible cracks or corrosion appear, arm or splines are loose/worn, or adjuster fails to hold brake clearance after manual reset.