Pool Gate Solution: Positive Force Gate Closing System

The Positive Force Gate Closing System is based on an overhead concealed door closer whose arm can travel in both directions. Locksmiths have installed these hydraulic closers for over 40 years.


Positive Force Gate Closing System also has weld-on kits for round (chain link) and square tube fence/gate applications.

A square tube metal fence has top and bottom channels (horizontals) and pickets (verticals) located to provide a maximum four inches opening. Depending upon the supplier, many of these fences and gates are available as separate components, enabling fence and gate installation without requiring a welder.

For this article, Positive Force Gate Closing System provided two five-foot tall fence sections with an opening for a three-foot wide gate. The fence and gate components were purchased from a big box hardware store. The supplied overhead concealed closer used in this installation is a Calibre CA3311 adjustable spring power ADA model with 105 degree back stop and no hold-open. The closer comes with a five-year limited manufacturer’s warranty.

Installing the bolt-on Positive Force Gate Closing System only requires hand tools. The closer housing, bottom pivot and the arm housing are secured to the fence and gate using supplied Tek screws. The gate to fence positioning is a one inch opening between the hinge side of the gate and the fence post. This is because the pivot requires one inch spacing. As an added benefit, this spacing provides a “no pinch” opening for small children placing their fingers or hands between the gate and the fence post. The latch side gate to fence spacing varies depending upon the latching mechanism. A gravity latch and striker bar mechanism will have a wider opening requirement than a lock or exit device.

The Positive Force Gate Closing System Bolt-on Kit is designed to be installed onto a square tube fence where the upper channel for both the fence and the gate are at the same height.

To install the closing system, slide the closer housing onto the top of the hinge side fence post. The housing rests against the fence top channel. The fence channel side of the housing is shorter and positions the closer at the correct height for the modified K-arm housing. If necessary, cut the fence post until the closer housing seats at the proper height.

Slide the modified K-arm housing onto the top of the gate’s hinge edge. Slide the pivot assembly onto the bottom of the gate’s hinge edge. Measure the gate’s length from the bottom of the pivot to the top of the housing. Add 1/8” to this measurement. This provides the spacing between the closer housing and the K-arm housing.

Once the closer housing is in position, measure this distance from the bottom of the closer housing to locate the pivot. Install the bottom pivot using the supplied Tek screws. Make certain the pivot is level.

Slide the gate onto the bottom pivot. Determine the distance between the top of the K-arm housing and the bottom of the closer housing. The gap should be 1/16” to 3/16”. This is sufficient clearance for the gate swing and leaves enough spindle in order to attach the arm.

Install the closer housing onto the fence post and the modified K-arm housing and pivot onto the gate using the supplied Tek screws.

Slide the closer into the housing and secure by installing the housing cap and the mounting screws.

Slide the end load K-arm into the housing with the flat side up. Secure the arm at the center of housing using the two top mount screws. The arm will be adjusted once the gate has been installed. The top screw closest to the hinge side should be tightened. This is because once the gate is mounted onto the fence post, this screw is no longer accessible.

Slide the gate onto the bottom pivot. Position the gate in the opening with the closer spindle sliding into the opening in the K-arm. Swing the gate approximately ninety degrees and install the arm block and secure using the two hex head mounting screws. Operate the gate several times.

Note: The gate should be plumb and have a one inch opening to the fence post.

The K-arm is secured within the gate housing by four screws. The screws are installed and adjusted from the exterior of the housing. The two side screws adjust the lateral positioning of the arm in order to have the gate stop at the desired location. Once lateral adjustment is complete, the two top screws are tightened to secure the arm in place.

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