THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 14
Jun 1/03
2G14
24-30-00
(2) Cleaning and Inspection
(a) Clean the rotor, stator and bearings with a clean cloth. Do not clean these parts with
solvent.
(b) Rotate the front bearing on the drive end of the rotor shaft. Check for any scraping noise,
looseness, or roughness. Look for excessive lubricant leakage. If any of these conditions
exist, replace bearing.
(c) Inspect the rotor shaft rear bearing surface for roughness or severe chatter marks.
Replace the rotor assembly if the shaft is not smooth.
(d) Place the rear bearing on the slip-ring end of the rotor shaft and rotate the bearing. Make
the same check for noise, looseness, or roughness as was made for the front bearing.
Inspect the rollers and cage for damage. Replace the bearing if these conditions exist, or
if the lubricant is lost or contaminated.
(e) Check the pulley and fan for excessive looseness on the rotor shaft. Replace any pulley or
fan that is loose or bent out of shape.
(f) Check both the front and rear housings for cracks, particularly in the webbed areas, and
at the mounting ear. Replace damaged or cracked housings.
(g) Check all wire loads on both the stator and rotor assemblies for loose or broken soldered
connections and for burned insulation. Resolder poor connections. Replace parts that
show signs of burned insulation.
CAUTION: DO NOT TURN DOWN SLIP-RINGS BEYOND A MINIMUM DIAMETER OF
1.22 INCHES. IF THE RINGS ARE BADLY DAMAGED, REPLACE THE
ROTOR ASSEMBLY.
(h) Check the slip-rings (brush contacts) for nicks and surface roughness. Nicks and
scratches may be removed by turning down the slip rings.
(i) Replace brush assembly if brushes are worn beyond 5/16 inch minimum length.
(3) Rotor Continuity Test (Refer to Figure 13.)
(a) Separate front housing and rotor assembly from rear housing by removing four housing-
thru bolts and separating rear and front housings. Springs and brushes are not retained
by brush holder when housings are separated.
(b) Set the ohmmeter selector switch on resistance scale 1 and zero meter.
(c) Touch one lead of ohmmeter to each segment of the slip ring. The meter should read 3 to
5 ohms.
(d) Readings higher than 5 ohms indicate a damaged solder connection at the slip rings or a
broken wire.
(e) Readings lower than 3 ohms indicate a shorted wire or slip ring.
(f) Replace the rotor if repairs cannot be made.
(4) Rotor Ground Test (Refer to Figure 14.)
(a) Set the ohmmeter selector switch on 1000 scale and zero the meter.
(b) Touch one lead to the rotor shaft and the other lead to first slip ring then to the other. The
ohmmeter should read infinity (no needle movement) in both checks.
(c) If the meter shows a reading (needle moves) a short to ground exists. Check the soldered
connections at the slip rings to make sure they are secure and grounding against the rotor
shaft, or that excess solder is not grounding the rotor coil.
(d) Replace the rotor if repairs cannot be made.
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