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Woodward PSG Governor operating and Workshop service Book
BULLETIN 37013A
PSG GOVERNOR
OPERATING AND SERVICE MANUAL
BULLETIN 37013A
Section Title Page
SECTION I/GENERAL INFORMATION AND INSTALLATION
Section Title Page
Parts Cleaning 17
Introduction 2 Parts Check 17
General Information 2 Parts Repair 18
Overspeed 2 Assembly 18
Installation 2 Testing 24
Speed Adjustment 2
Speed Droop 3 SECTION IV/REPLACEABLE PARTS
Initial Operation and Adjustment 3 Introduction 25
Storage 3 Replacement Parts Information 25
Illustrated Parts Breakdown 25
SECTION II/PRINCIPLES OF OPERATION
I ntroduction 5 SECTION V/AUXILIARY EQUIPMENT
Operation 5 Introduction 29
Spring Driven-Oil Damped Ballhead 29
SECTION III/MAINTENANCE Torsion Spring 32
Introduction 8 Pneumatic Speed Setting 32
Troubleshooting 8 Speed Adjusting Motor 40
Speed Droop Adjustment 14 Externally Adjusted Speed Droop 42
Removal of Governor from Engine 15 Internal Return Spring 44
Tools for Disassembly & Assembly 15 Temperature Compensated Needle Valve 49
Disassembly of Governor 15 Fuel Rod 49
LIST OF ILLUSTRATIONS
Figure Title Page Figure Title Page
1-1 External Features of Basic PSG 1 3-16 Buffer System Assembly 20
1-2 Outline Drawing, Basic PSG 4 3-17 Power Piston Assembly 20
2-1 Cutaway Schematic, Basic PSG 6 3-18 Ballhead Installation 20
2-2 Schematic Diagram, PSG with 3-19 Thrust Bearing & Speeder
External Return Spring 7 Spring Parts 20
3-1 Droop Adjustment 14 3-20 Thrust Bearing & Spring Seat Assembly 21
3-2 Assembly Tools 15 3-21 Spring Seat Adjustment 21
3-3 Terminal Shaft Removal 16 3-22 Centering the Pilot Valve Plunger 21
3-4 Speeder Spring Removal 16 3-23 Torquing Lock Nut 21
3-5 Pilot Valve Disassembly 16 3-24 Centering Pilot Valve Plunger 22
3-6 Removal of Ballhead 17 3-25 Speeder Spring Installation 22
3-7 Check Valve Assembly 18 3-26 Terminal Lever & Terminal Shaft
3-8 Honing Idler Gear 18 Parts Layout 22
3-9 Honing Pilot Valve Bushing Gear 19 3-27 Droop Bracket Assembly 22
3-10 Plugs Inserted for CCW Rotation 19 3-28 Setting Zero Droop 22
3-11 Plugs Inserted for CW Rotation 19 3-29 Speed Adjusting Parts Layout 22
3-12 Pilot Valve Bushing Assembly 19 3-30 Speed Adjusting & Floating
3-13 Compensating Bushing Assembly 19 Lever Assembly 23
3-14 Seating Retaining Ring 19 3-31 Bending Spring Wire Pin 23
3-15 Base to Case Assembly 20 3-32 Seal Installation 23
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