— Note —
The spring tension is 32 to 40 ounces with new brushes This tension is measured with a spring scale hooked under the brush spring near the brush and the reading is taken at right angles to the line of force exerted by the brush spring.
3. Check the position of the pinion to be sure the unit will mesh properly with the flywheel ring gear.   See Chart 8002 for specifications.
BENCH TESTS.
1.
After the starting motor is reassembled, it should be tested to see that no load current at a certain voltage is within specification as given in Chart 8002. To make this test, connect as shown in Figure 80-5.  If current is too high, check the bearing alignment and end play to make sure there is no binding or interference. Two or three sharp raps on the frame with a rawhide hammer will often help to align the bearings and free the armature.

2.
If no difficulty is indicated in the above test, a stall torque test may be made to see if the starting motor is producing its rated cranking power.  Make test connections as shown in Figure 80-6.

3.  
If torque and current are not within specifications, check the seating of the brushes and internal connections for high resistance. If these checks are made and found to be in good order, replace frame and field assembly and retest starter.

STARTING MOTOR CONTROL CIRCUIT.
1.
Inspect the control circuit wiring between the battery, solenoid and manual starting switch for breaks, poor connections and faulty insulation.  Tighten all ground connections and make sure solenoid is firmly mounted and makes a good ground connection.

2.
Check the voltage loss across the switch contacts during normal starting.   If loss is in excess of 0.2 volts per 100 amps, the solenoid should be replaced.

3.
If solenoid fails to operate when the manual starting switch is turned on, or if it fails to release when the manual starting switch is released, it should be replaced.

80-10-00 Page 80-13 Issued: April 1, 1997

STARTING MOTOR SERVICE TEST SPECIFICATIONS.
Prestolite specifications for installed, standard equipment, 12 volt starting motors are as follows:
CHART 8002. STARTING MOTOR SPECIFICATIONS
Motor Model MZ-4220/2 Min. Brush Tension 32 oz. Max. Brush Tension 40 oz. No-Load Test (77° F) Volt 10 Max. Amps 75 Min. R.P.M. 2000 Stall Torque 
Amps 560 Min. Torque, Ft. Lbs. 38.0 Approx. Volts 4.0 Pinion Position* Drive at rest 1.748 in. - 1.855 in. Drive extended 2.388 in. - 2.495 in. *This dimension is measured from the centerline of the mounting hole nearest the drive end head to the edge of the pinion. 

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AIRPLANE MAINTENANCE MANUAL
CARD 4 OF 4

PA-44-180

(SN 4496001 AND UP)

THE NEW PIPER AIRCRAFT, INC.

PART NUMBER 761-892 REVISED: FEBRUARY 28, 2002

THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

Published by
Technical Publications

. The New Piper Aircraft, Inc.
2926 Piper Drive
Vero Beach, Florida  32960
U.S.A.

Member General Aviation Manufacturers Association
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

AEROFICHE REVISION STATUS
Revisions to this Maintenance Manual (P/N 761-892) issued April 1, 1997 are as follows:
Revision Publication Date Aerofiche Card Effectivity

ORG970401 April 1, 1997 1, 2, 3, and 4 PR020228* February 28, 2002 1, 3, and 4
* PARTIAL REVISION OF MAINTENANCE MANUAL 761-892
Revisions appear in Aerofiche Cards 1, 3, and 4. Accordingly, discard your existing Aerofiche Cards 1, 3, and 4 and replace them with these dated 02/28/02.
Consult the Customer Service Information Aerofiche (P/N 1753-755) for current revision dates for this manual.
Aerofiche Effectivity Page 1 Revised: February 28, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

THIS PAGE INTENTIONALLY BLANK

Aerofiche Effectivity Page 2 Revised: February 28, 2002
4A4
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

INTRODUCTION 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER SECTION  SUBJECT  GRID NO.  EFFECTIVITY 

Introduction A7 1R0202 Instructions for Continued Airworthiness A7 A0202 General A7 A0202 Effectivity A8 A0202 Serial Number Explanation A8 Assignment of Subject Material A8 A0202 Pagination A8 A0202 Aerofiche Effectivity A9 1R0202 Identifying Revised Material A9 1R0202 Indexing A9 A0202 Warnings, Cautions, and Notes A10 1R0202 Supplementary Publications A10 A0202 PIPER Publications A10 1R0202 Vendor Publications A10 1R0202 Chapter/Section Index Guide A13 1R0202
　
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