GORMAN-RUPP PUMPS GMS1 1/2 User manual

OM-07468-05
September 1, 2022
GORMAN‐RUPP PUMPS
www.grpumps.com
2022 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
ROTARY GEAR PUMP
MODELS
GMS SERIES PUMPS
GMS1 1/2GH3-B /S2

Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your pump model and serial number in the
spaces provided below. Your Gorman‐Rupp distributor
needs this information when you require parts or service.
Pump Model:
Serial Number:

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1...................................................
SAFETY - SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1.....................................
PUMP MODEL DESIGNATION PAGE B-1..................................................
PREINSTALLATION INSPECTION PAGE B-2................................................
STORAGE PAGE B-2....................................................................
Flushing PAGE B-2..................................................................
PUMP INSTALLATION PAGE B-3..........................................................
Lifting PAGE B-3.....................................................................
Positioning The Pump PAGE B-3......................................................
Mounting PAGE B-3.................................................................
Piping PAGE B-3....................................................................
Strainers PAGE B-4..................................................................
Gauges PAGE B-4...................................................................
Sealing PAGE B-4...................................................................
Valves PAGE B-4....................................................................
Barrier Liquids for Optional Double Lipseal PAGE B-4....................................
ALIGNMENT PAGE B-4..................................................................
Coupled Drives PAGE B-4............................................................
V‐Belt Drives PAGE B-5...............................................................
V‐BELT TENSIONING PAGE B-5..........................................................
General Rules of Tensioning PAGE B-5.................................................
Tension Measurement PAGE B-6......................................................
ELECTRICAL CONNECTIONS PAGE B-7...................................................
OPERATION - SECTION C PAGE C - 1.......................................
PUMP OPERATION PAGE C-1............................................................
PRE‐OPERATION PAGE C-1..............................................................
Before Starting The Pump PAGE C-1...................................................
Checking Pump Rotation PAGE C-1...................................................
STARTING PAGE C-1....................................................................
OPERATION PAGE C-2..................................................................
Liquid Temperature PAGE C-2.........................................................
Overheating PAGE C-2...............................................................
Checking Gauges PAGE C-2..........................................................
Strainer Check PAGE C-2.............................................................
Leakage PAGE C-2..................................................................
PRESSURE RELIEF VALVE ADJUSTMENT PAGE C-3........................................
Cracking Pressure PAGE C-3.........................................................
Complete By‐Pass Pressure PAGE C-3.................................................
STOPPING PAGE C-3....................................................................
TROUBLESHOOTING - SECTION D PAGE D - 1...............................
TROUBLESHOOTING WITH GAUGES PAGE D-1............................................
TROUBLESHOOTING CHART PAGE D-2...................................................
PREVENTIVE MAINTENANCE PAGE D-3...................................................

TABLE OF CONTENTS
(continued)
ii
PUMP MAINTENANCE AND REPAIR - SECTION E PAGE E - 1.................
PARTS KEY:
Typical GMS D, G, J And N Pump Models PAGE E-3.....................................
Typical GMS R Pump Model PAGE E-5.................................................
PUMP DISASSEMBLY PAGE E-6..........................................................
Preparing for Disassembly PAGE E-7..................................................
Pressure Relief Valve (10) PAGE E-7...................................................
Foot Bracket Kit (08) PAGE E-7........................................................
Head/Idler Kit (01/02) PAGE E-7.......................................................
Gland Removal (04N) PAGE E-7.......................................................
Backhead Removal (06) PAGE E-8....................................................
Rotor/Shaft Removal (03) PAGE E-8...................................................
Seal Removal (05) PAGE E-8..........................................................
Housing Assembly (04) PAGE E-8.....................................................
PUMP REASSEMBLY PAGE E-8..........................................................
Cleaning and Inspection PAGE E-8....................................................
Bushing Preparation PAGE E-9........................................................
Housing Assembly (04) PAGE E-9.....................................................
Backhead Kit (06) PAGE E-9..........................................................
Rotor/Shaft Assembly (03) PAGE E-9..................................................
Head/Idler Kit (01/02) PAGE E-10......................................................
Seal Installation (05) PAGE E-10.......................................................
Gland Installation (04N) PAGE E-10....................................................
Foot Bracket Kit (08) PAGE E-10.......................................................
SETTING END CLEARANCE PAGE E-10...................................................
RELIEF VALVE DISASSEMBLY PAGE E-11.................................................
RELIEF VALVE REASSEMBLY PAGE E-12..................................................
Relief Valve (10) Installation PAGE E-13................................................
SEAL APPENDIX - SECTION F PAGE F-1.....................................
Standard Friction Drive And Optional 60A And 61J Mech. Seals PAGE F-1......................
Lip Seal Option 65A PAGE F-3............................................................
Positive Drive (Option 60D) Seal PAGE F-5..................................................
Standard Packing Seal (Option 65) PAGE F-7...............................................
O‐RING APPENDIX - SECTION G PAGE G-1..................................
JACKETED HEAD/BACKHEAD APPENDIX - SECTION H ………………….PAGE H-1
Inlet and Outlet Location …… .PAGE H-1...................................................

OM-04386GMS SERIES
PAGE I-1INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp Rotary
Gear Pump. This manual is designed to help you
achieve the best performance and longest life from
your Gorman‐Rupp Rotary Gear pump. Read this
manual carefully to learn how to safely install, op
erate and repair your pump. Failure to do so could
result in personal injury or damage to the pump.
This manual will alert personnel to known proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel. However,
this manual cannot possibly provide detailed in
structions and precautions for each specific ap
plication or for every situation that might occur dur
ing maintenance of the unit. Therefore, it is the re
sponsibility of the owner, installer and/or mainte
nance personnel to ensure that applications and/
or maintenance procedures not addressed in this
manual are performed only after establishing that
neither personal safety nor pump integrity are
compromised by such applications or procedures.
In addition to this manual, a separate Parts List is
shipped with the pump. Refer to the Parts List when
ordering parts. If your pump is furnished with a
drive unit, refer to the drive unit manufacturer's in
stallation and operation instructions in the litera
ture accompanying the pump.
These pumps can transfer a wide range of light,
medium, and heavy viscosity liquids, depending
on design and components. Some models are
not recommended for use with water; others
when fitted with specific options, may be used
with water; consult the factory.
If there are any questions regarding the pump or
drive unit which are not covered in this manual or
in other literature accompanying this unit, please
contact your Gorman‐Rupp distributor or the Gor
man‐Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
WARRANTY INFORMATION
The warranty provided with your pump is part of
Gorman‐Rupp's support program for customers
who operate and maintain their equipment as de
scribed in this and the other accompanying litera
ture. Please note that should the equipment be
abused or modified to change its performance be
yond the original factory specifications, the war
ranty will become void and any claim will be de
nied.
The following are used to alert personnel to proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel:
Immediate hazards which will result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product or
property damage. These instructions de
scribe the requirements and the possible
damage which could result from failure to
follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.