LiftMaster K75-19977 Arm Kit for Commercial Slide and Door Operators

LiftMaster K75-19977 Arm Kit for Commercial Slide and Door Operators

The LiftMaster K75-19977 Arm Kit is a complete OEM replacement assembly engineered for commercial slide gates and jackshaft door operators. It includes the arm mechanism, spring, chain, mounting hardware, and safety cable needed for a direct, bolt-on swap. Designed to match LiftMaster factory specifications, it restores smooth, precise arm movement and maintains operator performance without requiring custom fabrication.

Key Features

• OEM-Matched Fit – Built to LiftMaster specifications for exact alignment and secure installation.
• Complete Hardware Set – Arm, chain, spring, cable, bolts, and nuts included for a ready-to-install kit.
• Wide Model Compatibility – Works with SL575GL, HJ, DJ, DHJ, and J industrial-duty operators.
• Commercial Application Ready – Supports gate and door systems in warehouses, parking facilities, and perimeter security sites.

Technical Specifications

• Part Number: K75-19977
• Compatible Models: SL575GL, HJ, DJ, DHJ, J
• Mounting Style: Direct bolt-on
• Included Components: Arm assembly, chain, spring, cable, bolts, nuts, washers

Conclusion

For facility managers, security contractors, or property owners maintaining LiftMaster commercial operators, the K75-19977 Arm Kit offers a factory-grade replacement that fits right and keeps your system operating as intended. Always confirm your model number before purchase.