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Description
WILLIAMS CONTROLS WM388U1C3D Pneumatic Throttle Control Cylinder
Extends to position the throttle lever in response to air pressure. When system pressure is low, the fast-idle feature engages to maintain engine operation during warm-up.
Type: WM‑388 series single-acting pneumatic cylinder for engine throttle control. “U1C3D” variant includes integral fast-idle function
Integral Fast-Idle Cylinder: Automatically sets throttle to fast idle when air pressure is insufficient for normal operation
External Spring Requirement: To meet FMVSS‑124 compliance, an external spring must be installed aligned with the cylinder rod. Required spring forces: approx. 10 lb at idle and 72 lb at full throttle
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