Aircraft Alternator
Maintenence Manual
24-30-01 ES1031
Page: 3-8 Rev. A: 11 Aug. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
3.3 Alternator Drive Coupling Troubleshooting
A. The alternator drive coupling is provided by the airframe or engine manufacturer and
those manufacturers normally issue instructions regarding maintenance and installation.
The alternator drive coupling is fundamental to the operation of Hartzell Engine
Technologies (HET) gear driven alternator. Observe the following information when
installing and using the drive coupling:
B. If an alternator is determined to be at fault, note that the gear coupling is considered a
part of the engine installation and should be removed from the alternator and properly
installed on the replacement unit.
(1) Check for any and all service information from the engine, airframe and the drive
coupling manufacturer concerning the installation, inspection, and replacement of
the drive coupling.
(2) Check the general condition of the drive coupling (this requires removal of the
alternator).
(3) Check the shaft nut and cotter pin for damage. (Damage to these parts will
indicate interference with internal engine parts.) If damaged, determine cause and
correct the issue.
(4) Using the manufacturer’s service information, check the condition of the gear teeth
and the elastomer insert. If damaged, replace or overhaul the drive coupling.
(5) Whenever the alternator is overhauled, HET recommends that the drive coupling
be replaced. If the alternator cannot be overhauled or repaired and is being
replaced, the coupling should also be replaced.
(6) To further aid inspection, Continental Motors includes drive coupling service
information in the appropriate engine manuals and also in service bulletins. (Refer to
CMI SB11-3 and/or SB95-3B for drive coupling service information.)
3.4 Alternator Belt Troubleshooting
A.
Although the alternator belt is provided by the airframe or engine manufacturer and
those manufacturers normally issue manuals or instructions regarding their maintenance,
the belt is fundamental to the operation of Hartzell Engine Technologies LLC (HET)
prevent mis-diagnosis of what may seem to be an alternator fault.
B. Hartzell Engine Technologies new or overhauled alternators using belt drives are
designed for two basic types of belts via custom pulley installations. The most
common type is the single smooth V belt (large and small width) and the Poly-V
belts (either type) is to transfer rotational energy produced by the engine to various
accessories that are needed for the aircraft.
C. The belt system or “drive” may be simple, running from the engine drive sheave to
an alternator or it might be complex in not only running the alternator, but including
troubleshooting will provide insight into both sound and visual inspection practices to
identify a belt condition before moving on to the alternator or other component.
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