3-8. DUPLEX AIR GAGE (cont)
If duplex air gage (7) is removed from the locomotive, test by the following:
Use a deadweight tester and test duplex air gage (7) at half scale and full scale. Compare amount of
weight applied to the reading shown on gage.
Adjust pointer as follows:
Use a puller and remove pointer.
Apply 30 psi (207 kPa) test pressure and install pointer.
Set pointer on the 30-psi (207 kPa) mark on the dial. Check calibration over the entire scale.
Recheck duplex air gage (7) for accuracy.
If duplex air gage is not accurate, further repair is required. Send duplex air gage to a calibration facility.