Johnson Controls D-3153-104 Stop Screw Kit

For veteran field technicians managing pneumatic control systems, the Johnson Controls D-3153-104 is the essential stop screw kit required to calibrate the power stroke on D-3153 pneumatic actuators. Whether you are performing a piston damper actuator repair or setting up new HVAC pneumatic controls, this kit allows for precise mechanical travel limitation when dampers must maintain a minimum air circulation point. The assembly includes two heavy-duty 1/4-20 x 3" stop screws and two matching 1/4-20 hex nuts, providing the necessary hardware to prevent over-stroking and ensure long-term stability of the linkage. Designed for high-duty cycle industrial environments, these components integrate directly into the actuator housing. By utilizing this actuator stroke adjustment kit, contractors can fine-tune damper positioning to meet strict ventilation requirements without relying on external brackets or improvised field fixes. This is a direct OEM replacement part, ensuring thread compatibility and material integrity for safety-critical damper applications.

• Stroke Limitation: Specialized design for limiting the power stroke on D-3153 and D-3246 actuators to guarantee minimum outdoor air intake.
• OEM Precision: Includes two 1/4-20 x 3-inch screws and hex nuts for a perfect fit into factory-tapped housing holes.
• Contractor Reliability: Eliminates the need for unreliable field-fabricated stops, ensuring consistent damper actuator travel.
• Simplified Calibration: Facilitates easy mechanical adjustments to the power stroke using standard 7/16-inch or adjustable wrenches.

What is the primary function of the D-3153-104 stop screw kit?
This kit is used to mechanically limit the extension of the actuator piston, which is critical in applications where a damper must remain partially open to ensure a minimum percentage of air circulation even when the controller signal is at zero.

Is this kit compatible with other Johnson Controls pneumatic actuators?
While primarily designed for the D-3153 series, this kit is also technically compatible with the D-3246 series actuators, as they share the same housing thread specifications for stroke adjustment.

How do I install these screws for proper stroke reduction?
Technicians should thread the hex nuts onto the screws, apply air pressure to fully stroke the actuator, and then thread the screws into the housing until they contact the internal piston. You then adjust the nuts to the desired stroke reduction distance and lock them against the housing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.