THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 34
Jun 1/03
2D22
21-50-00
(b) Alignment (See Figure 13.)
Check and adjust compressor belt and pulley alignment as follows:
CAUTION: VERIFY THE STRAIGHTEDGE HAS SOLID CONTACT WITH THE
SURFACE OF THE RING GEAR TO ENSURE TRUE READINGS.
1 Establish a datum line for checking belt and pulley alignment by clamping a
straightedge to the forward machined edge of the ring gear.
2 Obtain the nominal compressor belt offset at the ring gear. Measure the dimension
from the forward edge of the compressor belt (in its ring gear sheave) to the forward
machined surface of the ring gear.
3 Measure actual compressor belt offset at the compressor sheave (Point-B). Measure
the dimension from the forward edge of the compressor belt (in its compressor
sheave) to the aft surface of the straightedge.
NOTE: If the compressor sheave offset is extreme, it may be adjusted by adding (or
removing) shims between the compressor mounting ears and the
compressor mounting bracket as described in Compressor, Installation,
above. If zero offset is not obtainable, note the measured offset.
4
Measure actual compressor belt offset at the compressor idler pulley (Point-A).
Measure the dimension from the forward edge of the compressor belt (in its idler
sheave) to the aft surface of the straightedge. Belt offset at Point-A should be
approximately half the offset (if any) measured at Point-B.
NOTE: Compressor Idler Pulley (Point A) offset is adjusted by adding (or removing)
shims (LYC. P/N 76534 - 1.130 IN. OD x .410 IN. ID x .005 IN. THK) between
the compressor mounting ears and the compressor belt adjusting bracket
until the idler pulley is in (or as close as shims will allow to) the belt plane.
The nominal idler pulley offset at Point A will be approximately one-half the
measured compressor sheave offset at Point B.
(c) Adjusting Drive Belt Tension (Compressor and/or Alternator)
CA
UTION: THE HIGHER TENSION SPECIFIED FOR A NEW BELT IS TO
COMPENSATE FOR INITIAL STRETCH AT FIRST OPERATION. DO NOT
APPLY HIGHER TENSION VALUES TO USED BELTS.
1 Compressor or Alternator Belts - use a calibrated belt tension gauge to adjust a new
belt to 90-120 pounds of static tension. Run in for 15 minutes. If tension falls below
50 lbs., re-tension to 70 lbs.
2 Install engine baffles if removed. Install engine cowling.
CAUTION: IF AIR CONDITIONER IS OPERATED ON THE GROUND FOR
SERVICING, CLEAR TEST AREA OF ANY LOOSE OBJECTS LYING
ON RAMP. ENSURE THAT A QUALIFIED PERSON IS AT THE
AIRPLANE CONTROLS.
3 Run engine 15 minutes at 1200 rpm.
4 Shut down engine, remove engine cowling, and check both belt tensions.
5 Check tension every 100 hours or annual inspection, whichever comes first.
6
Check all idler and bracket bolts for safety. Install engine cowling.
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