Piper SARATOGA PA-32-301 Maintenance Manual page 139

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
5. Check the belt and pulley alignment of the compressor and or alternator by the followin method
A. A datum line must be established for checking belt and pulley alignment. A nominal dimension
must be established between the forward edge of the compressor belt and theforward machined surface of the
ring gear. This dimension should be taken at the ring gear assembly where the belt is in its sheave. The amount
of misalignment can then be determined at the other pulley sheaves by using a stiff straightedge of sufficient
length to extend from the front of the ring gear to the component sheaves.
- NOTE-
Insure adequate ring gear surface contact to provide a solid basefor
the straightedge.
B. Obtain a basic measurement from the top of the ring gear by measuring the width of the starter
ring gear plus the dimension from the forward machined surface of the ring gear to the forward edge of the
compressor drive belt. (Refer to Figure 21-12.)
C. The check and adjustments of the compressor and or alternator drive belts require different
procedure,. Refer to following appropriate instructions.
6 Compressor Belt Alignment: (Refer to Figure 21-12.)
A
Place the straightedge against the right forward side of the ring gear and measure belt alignment
at compressor sheave (Point-B).
B. Measure belt alignment at the compressor idler pulley (Point-A). The belt misalignment at
Point-A should be half the misalignment of Point-B and the dimension at the top of the ring gear and in the
same direction fore and aft.
C If at Point-A nominal misalignment is not within + - .030 of an inch. as obtained from Step B.
add or remove shims as required. Belt alignment should be made as close to nominal as shims will allow
Alternator Belt Alignment (Refer to Figure 21-12.)
A With the alternator belt installed, align the idler pulley in the belt plane by adding or removing
shims. P N 62833-82 as required.
ADJUSTMENT OF DRIVE BELT TENSION.
The adjustment of the compressor and or alternator drive belts is very important to obtain lone belt lite
and proper component operation
I.
Adjust new compressor belt to 120 pounds span tension and new alternator belt to 90-100 pound
span tension. When using the plastic type alternator belt adjust the tension at 65-70 lbs. for new belt. Use a
calibrated belt tension gauge.
-NOTE
-
The higher tension specified for a new belt is to compensate or the
initial stretch that takes place as soon as it is operated These higher
tension values should not be applied to belts which previously have
been used. See tensions noted below for used belts.
2. Install engine baffles if removed and install engine cowling.
21-58-06
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