Service Manual 73
Page 2 of 32
Table of Contents
Introduction Page 2
General Description/Pumping Principle Page 3
Modular Design Page 3
GlobalGear Models Page 4
Installation Page 5
Simple Efficiency Improvement Page 6
Packing Adjustment Page 6
Lubrication Requirements Page 7
Recommended Lubricants Page 7
Parts Interchangeability Page 8
Inspection / Repair Page 9
Pump Disassembly - Partial Page 9
Drive Module Remova ; Page 10
Drive Module Installation Page 11
Cover / Idler Gear Installation Page 12
Relief Valve Installation Page 12
In-Line Seal / Packing Replacement Page 13
Torque requirements-Mounting hardware Page 13
Pump Disassembly – Complete Page 17
Pump Assembly Page 20
Idler Bushing Installation Page 20
Bracket Bushing Installation Page 21
Packing Installation Page 22
In-Board Mechanical Seal Installation Page 23
Out-Board Mechanical Seal Installation Page 23
Drive Module Rebuild / Installation Page 25
Cover / Idler Gear Installation Page 26
Relief Valve Installation Page 26
End Clearance Adjustment Page 27
Relief Valve Disassembly Page 29
Relief Valve Assembly Page 29
Pressure Adjustment of Relief Valve Page 29
Troubleshooting Page 30
Material Returns Page 32
Introduction
The GG Series pumps have been designed and manufactured to provide years of service under
normal operating conditions.
Illustrations used in this manual are for reference purposes only. Consult the factory or an
authorized Tuthill distributor for proper part identification.
When ordering replacement parts, provide as much detail as possible to ensure correct parts are
provided. Details should include the full model number (18 digits), serial number, name of part,
part number (if known) and part material.
Service Manual # 73 for the GG Series pumps is available at www.tuthillpump.com
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