Woodward TQ-125 Guide

Application Note 01300
(Revision NEW, 9/2000)
Original Instructions
TQ-125
Linkage Installation and Adjustment
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TQ-125 Linkage Installation & Adjustment Application Note 01300
2 Woodward
TQ-125
Linkage Installation and Adjustment
General
The linkage kit for the TQ-125 generally consists of the following parts: two rod
ends, a terminal lever, a length of threaded rod, and the associated hardware to
attach these items between the TQ-125 and the prime mover fuel control.
Linkage Compatibility
Match the actuator's direction of rotation with the fuel control's direction of
increased fuel. The TQ-125 has a counterclockwise rotation as viewed from the
shaft end for an increase fuel condition.
The linkage for diesel engine applications should be linear, and matched to the
TQ-125. The TQ-125 has a 60° shaft rotation. Carbureted engines will require a
carburetor compensating (non-linear) linkage. Incorrect linearity matching can
cause stable operation at some fuel settings but oscillation at other fuel settings.
Manually stroke the fuel control linkage from stop to stop as if the actuator were
moving it. The linkage should not bind or have play in it. Lubricate or replace
linkage or fuel control parts as required.
Make sure the actuator is capable of moving the fuel control to maximum and
minimum limits. Let the fuel control limit actuator travel. Set the linkage so the
actuator is just above minimum when the fuel control is at its minimum stop and
so the actuator is just below maximum when the fuel control is at its maximum
stop.
A positive shutdown device, such as a spring, is required to ensure shutdown
upon loss of signal to the TQ-125.
Any unauthorized modifications to or use of this equipment outside
its specified mechanical, electrical, or other operating limits may
cause personal injury and/or property damage, including damage to
the equipment. Any such unauthorized modifications: (i) constitute
"misuse" and/or "negligence" within the meaning of the product
warranty thereby excluding warranty coverage for any resulting
damage, and (ii) invalidate product certifications or listings.

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