GORMAN-RUPP PUMPS GMS Series User manual

OM---04386---01
September 2, 1996
Rev. A 05-22-97
TVXY
THE GORMAN-RUPP COMPANY MANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
Copyright by the Gorman-Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
ROTARY GEAR PUMPS
MODELS
GMS SERIES
PUMPS

TABLE OF CONTENTS
i
INTRODUCTION PAGE I --- 1...................................................
S A F E T Y --- S E C T I O N A PA G E A --- 1............................................
I N S T A L L A T I O N --- S E C T I O N B PA G E B --- 1.....................................
PREINSTALLATION INSPECTION PAGE B---1................................................
Flushing PA G E B --- 1..................................................................
PUMP INSTALLATION PAGE B--- 1..........................................................
Lifting PA G E B --- 2.....................................................................
Po s i t io n i n g T h e P u m p PA G E B --- 2......................................................
Mounting PA G E B --- 2.................................................................
Piping PA G E B --- 2....................................................................
Strainers PA G E B --- 2..................................................................
Gauges PA G E B --- 3...................................................................
Sealing PA G E B --- 3...................................................................
Valves PA G E B --- 3....................................................................
ALIGNMENT PA G E B --- 3..................................................................
C o u p l e d D r i v e s PA G E B --- 3............................................................
O P E R A T I O N --- S E C T I O N C PA G E C --- 1.......................................
P U M P O P E R A T I O N PA G E C --- 1............................................................
PRE-OPERATION PAGE C---1..............................................................
Before Starting The Pump PAGE C---1...................................................
Checking Pump Rotation PAGE C---1...................................................
STARTING PA G E C --- 1....................................................................
OPERATION PA G E C --- 2..................................................................
L i q u i d Te m p e r a t u r e PA G E C --- 2.........................................................
Overheating PA G E C --- 2...............................................................
Checking Gauges PAGE C---2..........................................................
Strainer Check PAGE C---2.............................................................
Leakage PA G E C --- 2..................................................................
PRESSURE RELIEF VALVE ADJUSTMENT PAGE C---3........................................
Cracking Pressure PAGE C---3.........................................................
Complete By-Pass Pressure PAGE C---3.................................................
STOPPING PA G E C --- 3....................................................................
T R O U B L E S H O O T I N G --- S E C T I O N D PA G E D --- 1...............................
PUMP MAINTENANCE AND REPAIR --- SECTION E PAGE E --- 1.................
PARTS KEY:
Typical GMS Pump Model PAGE E---3...................................................
ASSEMBLED GMS PUMP MODEL ILLUSTRATION PAGE E---4.................................
P U M P D I S A S S E M B LY PA G E E --- 5..........................................................
Pressure Relief Valve (10) PAGE E--- 5...................................................
Foot Bracket Kit (08) PAGE E ---6........................................................
Coverplate Kit (11) PAGE E---6.........................................................
Head Kit (01) PA G E E --- 6..............................................................
Idler Assembly (02) PAGE E--- 6.........................................................

TABLE OF CONTENTS
(continued)
ii
Backhead Kit Removal (06) PAGE E---6..................................................
Rotor/Shaft Removal (03) PAGE E---7...................................................
Seal Removal (05) PAGE E---7..........................................................
Housing Assembly (04) PAGE E ---7.....................................................
PUMP REASSEMBLY PAGE E---7..........................................................
Cleaning and Inspection PAGE E---7....................................................
Bushing Preparation PAGE E---7........................................................
Housing Assembly (04) PAGE E ---8.....................................................
Rotor/Shaft Assembly (03) PAGE E---8..................................................
Idler Assembly (02) PAGE E--- 8.........................................................
Head Kit (01) PA G E E --- 9..............................................................
Coverplate Kit (11) PAGE E---9.........................................................
Seal Installation (05) PAGE E--- 9........................................................
Backhead Kit (06) PAGE E---9..........................................................
Foot Bracket Kit (08) PAGE E ---9........................................................
SETTING END CLEARANCE PAGE E ---9....................................................
R E L I E F VA LV E D I S A S S E M B LY PA G E E --- 1 0.................................................
RELIEF VALVE REASSEMBLY PAGE E---11..................................................
Relief Valve (10) Installation PAGE E--- 12................................................
SEAL APPENDIX --- SECTION F PAGE F ---1...................................
Standard Type 21 And Optional 60A And 61J Mechanical Seals PAGE F---1......................
Standard Lip And Optional 65A And 65C Seal PAGE F---3......................................
Modified Type 9 (Option 60D) Seal PAGE F---5................................................

OM--04386GMS SERIES
PAGE I -- 1
INTRODUCTION
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 installation and oper-
ation instructions in the literature 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
or:
Gorman-Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
RECORDING MODEL AND
SERIAL NUMBERS
Please record the 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:
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.

GMS SERIESOM--04386
PAGE I -- 2 INTRODUCTION
The following are used to alert personnel to procedures 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.

GMS SERIES OM--04386
PAGE A -- 1
SAFETY
SAFETY --- SECTION A
This information is specific to Gorman-Rupp GMS
Series Rotary Gear Pumps. It applies throughout
this manual and any manual or literature ac-
companying the pump.
In addition to this manual, see the separate litera-
ture covering the drive unit used to operate this
pump.
Pumps and related equipment must be in-
stalled and operated according to all na-
tional, local and industry standards.
This manual will alert personnel to
known procedures which require spe-
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel. How-
ever, this manual cannot possibly pro-
vide detailed instructions and precau-
tions for each specific application or for
every situation that might occur during
maintenance of the unit. Therefore, it is
the responsibility of the owner, installer
and/or maintenance personnel to en-
sure that applications and/or mainte-
nance procedures not addressed in this
manual are performed only after estab-
lishing that neither personal safety nor
pump integrity are compromised by
such applications or procedures.
Before attempting to install, operate, or
service this pump, familiarize yourself
with this manual, and with all other liter-
ature shipped with the pump. Unfamil-
iarity with all aspects of pump operation
covered in this manual could lead to de-
struction of equipment, injury, or death.
The standard version of this pump is de-
signed to handle a wide range of light,
medium, and heavy viscosity liquid, de-
pending on design and components,
and a range of temperatures when fitted
with different seals. Do not apply at
higher temperatures than the seal will
handle. Do not attempt to pump liquids
which may damage the pump or endan-
ger personnel as a result of pump fail-
ure; consult the factory for chemical
compatibility.
If the pump and motor are furnished
mounted on a base, make certain that all
lifting devices have adequate capacity.
If chains or cables are used in lifting,
make certain that they are positioned so
as not to damage components, and so
that the load will be balanced.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are secure before op-
eration. Loose connections can result in
damage to the equipment and serious
injury to personnel.
Never operate the pump without a pres-
sure relief valve installed on the pump
or in the discharge piping. Make certain
that pump-mounted pressure relief

OM--04386 GMS SERIES
PAGE A -- 2 SAFETY
valves are installed with their adjusting
ends toward the suction port.Ifbi-rota-
tional operation is required, a pressure
relief device must be provided for both
directions of flow. Operation without a
pressure relief valve or with an improp-
erly installed relief valve could cause
the pump to explode, resulting in seri-
ous injury or death to personnel.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man-
ual.
2. Lock out incoming power to the
drive unit to ensure that the pump
will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Close the discharge and suction
valve (if used).
An overheated pump can cause severe
burns and injury. If overheating occurs:
1. Stop the pump immediately.
2. Allow the pump to completely cool.
3. Refer to the instructions in this
manual before restarting the
pump.
Do not remove plates, covers, gauges,
pipe plugs or fittings from an over-
heated pump. Vapor pressure within the
pump can cause parts being disen-
gaged to be ejected with great force. Al-
low the pump to completely cool before
servicing.
Do not operate this pump without
guards in place over the rotating parts.
Exposed rotating parts can catch cloth-
ing, fingers or tools, causing severe in-
jury to personnel.

GMS SERIES OM--04386
PAGE B -- 1
INSTALLATION
INSTALLATION --- SECTION B
Review all SAFETY information in Section A.
Pumps and related equipment must be in-
stalled and operated according to all na-
tional, local and industry standards.
Since pump installations are seldom identical, this
section is intended only to summarize general rec-
ommendations and practices required to inspect,
position, and arrange the pump and piping. If there
are any questions concerning your specific instal-
lation, contact your Gorman-Rupp distributor or
the Gorman-Rupp Company.
Most of the information applies to a flooded suction
installation where liquid is supplied under pres-
sure.
If the pump is positioned above the liquid in a static
lift installation, information such as mounting, pip-
ing configuration and priming must be tailored to
specific conditions.
Thesepumpsarenotrecommendedfor
use with water. Some models when fitted
with specific options may be used with wa-
ter; consult the factory.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be-
fore shipment from the factory. Before installation,
check for damage which may have occurred dur-
ing shipment. Check as follows:
a. Inspect the pump assembly for cracks, dents,
damaged threads, and other obvious dam-
age.
b. Check for loose attaching hardware. Since
gaskets tend to shrink after drying, check for
loose hardware at the mating surfaces.
c. Carefully read all tags, decals, and markings
on the pump assembly, and perform all duties
indicated.
Flushing
Clean piping is essential because of close-
tolerance moving parts in this pump. Flush
all dirt, grit, weld beads or scale from the
suction piping before installing the pump.
Damage to the pump because of debris in
the suction line is not covered by the pump
warranty.
Before shipment, the pump may have been tested
using a petroleum-based preservative. If flushing is
required, do not do so until just before installation;
the test oil protects close-tolerance pump parts
from corrosion.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from flame, sparks, and
excessive heat. Read and follow all pre-
cautions printed on solvent containers.
To flush the pump, use an approved solvent com-
patible with the liquid being pumped. Make cer-
tain that the solvent will not attack pump com-
ponents, particularly seals and gaskets.
PUMP INSTALLATION
Pump dimensions are shown in the separate
Pump Specification Bulletin.
Never operate the pump without a pres-
sure relief valve installed on the pump
or in the discharge piping. Make certain
that pump-mounted pressure relief

GHC SERIESOM--04352
PAGE B -- 2 INSTALLATION
valves are installed with their adjusting
ends toward the suction port.Ifbi-rota-
tional operation is required, a pressure
relief device must be provided for both
directions of flow. Operation without a
pressure relief valve or with an improp-
erly installed relief valve could cause
the pump to explode, resulting in seri-
ous injury or death to personnel.
Lifting
Remove suction and discharge hose and piping
before attempting to lift the pump. Use liftingequip-
ment with a capacity of at least five times the total
weight of the equipment being lifted.
Positioning The Pump
Locate the pump as close as possible to the liquid
being pumped. Locating the pump below the liq-
uid source will help self-priming and reduce the
possibility of cavitation.
Mounting
The pump may be shipped alone, mounted on a
base, or with pump and motor mounted on a base.
Install the pump and motor on a base before
mounting the base on a foundation.
Mount the base on a foundation that will provide
permanent, rigid support for the pump, and will be
heavy enough to absorb any vibration, strain or
shock.
Piping
Before establishing suction and discharge lines,
determine pump port positions and rotation. Fig-
ure B-1 shows typical port positions for the stan-
dard 90_housing; if you have selected a 180_
housing port option, your port positions will be dif-
ferent.
Begin piping layout at the pump, and work toward
the source of supply and the point of discharge.
Either hose or rigid pipe may be used to make con-
nections. If rigid piping is used, install expansion
joints to protect the pump from vibration and ther-
mal expansion in the piping. Do not use expansion
joints or flexible connectors to adjust misaligned
piping.
Housing Position Std. 90_Pump
(3---12 O’clock) Head Mounted Relief Valve
STD.
OPT.
Rotation Clockwise
Drive End
Rotation Counter-clockwise
1A
D
S
S
Front End
S
D
D
D
S
Figure B-1. Typical Port Positions & Rotation
The discharge and suction lines must be inde-
pendently supported to avoid vibration and strain
on the pump. For maximum pumping capacity,
keep the lines as short and straight as possible. El-
bows and fittings used in the lines increase friction
losses; minimize their use. Reducers used in suc-
tion lines should be the eccentric type installed
with the flat part uppermost to avoid creating air
pockets.
Before tightening a connection or flange, align it
exactly with the pump port. Never pull a pipe line
into place by tightening the flange bolts and/or
couplings.
Strainers
Because of the close-tolerance moving parts of
this pump, it is recommended that a strainer be in-
stalled in the suction line. The strainer should be
large enough to prevent excessive vacuum, and
capable of operating under high vacuum without
collapsing. The net open area of the strainer
screen depends on liquid viscosity and desired
flow rate; in any case, the sum of the area of all the
holes in the screen should be three to five times the
area of the suction pipe.

GMS SERIES OM--04386
PAGE B -- 3
INSTALLATION
Gauges
To monitor operation and assist in troubleshooting,
a vacuum gauge and a pressure gauge should be
installed on the pump.
Sealing
Even a slight leak will affect priming, head, and ca-
pacity, especially in a suction lift application. Seal
all piping joints, valves and gauges with pipe dope
or teflon tape. The sealing material should be com-
patible with the liquid being pumped.
Valves
To avoid air pockets, install piping valves with the
stem horizontal.
To prevent leakage during shutdown, install a shut-
off valve in the discharge line, particularly on a
flooded suction application. Shutoff valves are not
recommended for suction lines.
It is not recommended that a foot valve be installed
at the end of the suction line. If desired to install a
foot valve, consult the factory.
When handling very hot or cold liquids, install a
pressure relief valve in any part of the system that
can be valved off or isolated; this will protect piping
against damage from liquid thermal expansion or
contraction from temperature changes during
shutdown.
ALIGNMENT
Make certain that power to the drive unit
is disconnected before attempting to
connect the pump drive; otherwise, per-
sonal injury may result.
NOTE
See ROTATION in Section C before mounting the
pump on the base.
Coupled Drives
When using couplings, the axis of the power
source must be aligned to the axis of the pump
shaft in both the horizontal and vertical planes.
Most couplings require a specific gap or clearance
between the driving and the driven shafts. Refer to
the coupling manufacturer’s service literature.
Align spider insert type couplings by using calipers
to measure the dimensions on the circumference
of the outer ends of the coupling hub every 90_.
The coupling is in alignment when the hub ends
are the same distance apart at all points (see Fig-
ure B-2).
Figure B-2. Spider-type Couplings
Align non-spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90_. The coupling is in alignment when the
hubs are the same distance apart at all points (see
Figure B-3).
Figure B-3.Aligning Non-Spider Type Coupling
Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
side. When the straightedge rests evenly on both
halves of the coupling, the coupling is in horizontal
parallel alignment. If the coupling is misaligned,
use a feeler gauge between the coupling and the
straightedge to measure the amount of misalign-
ment.