USER'S AND
MAINTENANCE
MANUAL
01/31/2020
Air Compressor : D185T4F-DB
Copyright © 2014, ROTAIR S.P.A. - All rights reserved. This manual is intellectual property of ROTAIR S.P.A.
Its full or partial reproduction is forbidden under any form, on any support and by any means, without the
written authorization by ROTAIR S.P.A.
8) Measure with an optical tachometer (Letter B in Figure 11.1-2) the RPM of the harmonic balancer,
focusing the optical beam on the reflective indicator (Letter A in Figure 11.1-2)
9) Compare the measured value with the specification in Section 2.3 (1700RPM)
10) Adjust RPM as described above to the value of idle speed indicated ± 2-3%
11) Tighten the 23 mm lock nut when the appropriate RPM is obtained (Letter A in Figure 11.1-1)
12) Close the hood
Figure 11.1-2 Reflective mark on the harmonic balancer
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