WRENCH 3699937 - Caterpillar

Measuring and Adjusting Actuation Calibration Reading
Allow the turbocharger to cool.
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Install Indicator GP (D). The indicator can be mounted to a loose turbocharger as shown above or mounted to the engine. It may be necessary to use 6V-6042 Indicator Point to mount the Indicator (D).
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Adjust the indicator (D) so that it is in-line with the actuator arm. This will ensure an accurate reading.
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Remove hose (1) from the actuator (2).
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Install hose (B) onto kit (A) by using clamp (C). Connect the opposite side of hose (B) onto actuator (2) by using clamp (C).
Close the air pressure regulator on kit (A).
Connect shop air to kit (A). Do not exceed the maximum inlet pressure for the regulator supplied in kit (A).
Slowly open the regulator on kit (A). Observe the actuator (2) extending the shaft. Close the regulator. Observe the actuator (2) retracting the shaft. Repeat this cycle three times. This will ensure an accurate reading.
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Turn on the knob on the air pressure regulator kit (A) and slowly increase the air pressure while you observe the dial indicator (D). Increase the air pressure until the travel of the actuator rod (2) is 1 mm (0.039 inch). Observe the pressure gauge and record the pressure reading. The actuator (2) should always travel 1 mm (0.039 inch) when the actuator (2) is set to the specified pressure in Table 28
Close the regulator.
Adjust actuator (2) as needed.
To increase the calibration setting, increase the preload on the actuator spring by screwing the rod end further toward the canister. Each half turn is an increase of 3.4 kPa (0.5 psi).
To decrease the calibration setting, decrease the preload on the actuator spring by unscrewing the rod end further away from the canister. Each half turn is a decrease of 3.4 kPa (0.5 psi).
Repeat step 8 through 11 until the actuator (2) is set to the spec in Table 28.