DoorKing 9555 Maximum Security Slide Gate Operator

The DoorKing 9555 is a Class III and Class IV maximum security slide gate operator rated for gates up to 15,000 lbs (6,803 kg) and 160 ft (48 m) in length. Powered by a 5 HP motor through a 10:1 continuous oil bath gearbox with an included magnetic brake, the 9555 is specified for government facilities, military installations, airports, seaports, correctional facilities, border access points, and high-security industrial perimeters where Class III or IV operation is required, gate weight falls within its rated capacity, and manual gate operation during a power failure is an operational requirement. Class III and IV are restricted-access commercial and industrial classifications. This operator is not for residential or general public-serving applications.

10:1 Gearbox with Included Magnetic Brake

The 9555's defining characteristic is its 10:1 gearbox paired with an included magnetic brake. Unlike the 9550's 30:1 fail-secure configuration, the 9555 can be back-driven with mechanical assistance once power is removed. The magnetic brake holds the gate securely during normal powered operation; the 10:1 ratio allows controlled manual override when emergency response, maintenance access, or operational continuity during an outage requires it. This is the correct specification when facility protocols require the ability to move the gate without a mechanical disconnect procedure during a power interruption.

Gate weight capacity is 15,000 lbs on three-phase power and 9,000 lbs on single-phase — power configuration must be confirmed against gate weight during specification.

#100 Roller Chain Drive

The 9555 drives the gate with #100 high-tensile steel roller chain, providing a direct mechanical linkage that will not slip and is unaffected by ice, water, dirt, oil, or grease. The unit ships with 20 ft of #100 roller chain and chain brackets. A chain tray kit (p/n 2601-270) is available in 10-ft sections and is recommended for gates exceeding 20 ft.

Electrical and Control

The 9555 accepts 208, 230, or 460 VAC single or three-phase input. Adjustable solid-state variable speed control delivers slow-start and slow-stop operation at 1–2 ft/sec. Anti-tailgating, adjustable partial open, and selectable stop/reverse loop functions are standard. Limit switches are direct-driven internally and cannot be tampered with from outside the housing. Two 115 VAC outlets and two plug-in loop detector ports (DKS detectors only) are integrated. Built-in diagnostics check for specific fault conditions at the operator.

Gate Tracker Reporting

The 9555 includes Gate Tracker output compatible with DKS 1833, 1835, 1837, and 1838 access control systems (2358 expansion board required) for centralized operator data logging across multi-gate facilities.

The 9555 is ETL Listed by Intertek, Made in the USA, and backed by a 5-year limited warranty. Operating range: 10°F to 140°F (-12°C to 62°C).

For pricing or project specifications: 713-330-3333 or Jay@GateOperator.net.

9555 vs 9550 — Which Model?

Both the 9555 and 9550 run a 5 HP motor rated for gates up to 15,000 lbs and 160 ft. The gearbox is the decision point. The 9550 uses a 30:1 gearbox in a fail-secure configuration — the gate cannot be moved without a mechanical disconnect when power is removed, the right choice when maintaining a closed perimeter during any power condition is a hard requirement. The 9555 uses a 10:1 gearbox with an included magnetic brake and can be back-driven with mechanical assistance after power loss — correct when emergency or maintenance personnel need the ability to manually operate the gate during an outage without a disconnect procedure.