GORMAN-RUPP PUMPS GHC SERIES User manual

OM---04352---01
September 2, 1996
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
GHC SERIES
IRON AND STEEL
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.....................................
GENERAL INFORMATION PAGE B---1......................................................
PUMP MODEL DESIGNATION PAGE B---1..................................................
PREINSTALLATION INSPECTION PAGE B ---2................................................
STORAGE PA G E B --- 2....................................................................
Flushing PA G E B --- 2..................................................................
PUMP INSTALLATION PAGE B--- 3..........................................................
Lifting PA G E B --- 3.....................................................................
Po s i t io n i n g T h e P u m p PA G E B --- 3......................................................
Mounting PA G E B --- 3.................................................................
Piping PA G E B --- 3....................................................................
Gauges PA G E B --- 4...................................................................
Strainers PA G E B --- 4..................................................................
Sealing PA G E B --- 4...................................................................
Valves PA G E B --- 4....................................................................
Barrier Liquids for Dual Seals PAGE B---4................................................
ALIGNMENT PA G E B --- 5..................................................................
C o u p l e d D r i v e s PA G E B --- 5............................................................
V-Belt Drives PA G E B --- 5...............................................................
V-BELT TENSIONING PAGE B---6..........................................................
General Rules of Tensioning PAGE B---6.................................................
Tensioning Measurement PAGE B ---6...................................................
ELECTRICAL CONNECTIONS PAGE B---7...................................................
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 --- 3..................................................................
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...............................
PREVENTIVE MAINTENANCE PAGE D---4...................................................
PUMP MAINTENANCE AND REPAIR --- SECTION E PAGE E --- 1.................
PARTS KEY:
Typical GHC Pump Model PAGE E---3...................................................

TABLE OF CONTENTS
(continued)
ii
ASSEMBLED GHC PUMP MODEL ILLUSTRATIONS 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...................................................
Rotor Adjusting Sleeve (07) PAGE E---6.................................................
Coverplate Kit (11) PAGE E---6.........................................................
Head/Idler Kit (01) PAGE E---6..........................................................
Seal Removal (05) PAGE E---7..........................................................
Rotor/Shaft Removal (08) PAGE E---7...................................................
Foot Bracket Kit (06) PAGE E--- 7........................................................
Backhead Kit Removal (06) PAGE E---7..................................................
Housing Assembly (04) PAGE E---7.....................................................
PUMP REASSEMBLY PAGE E---8..........................................................
Cleaning and Inspection PAGE E---8....................................................
Bushing Preparation PAGE E---8........................................................
Housing Assembly (04) PAGE E---8.....................................................
Backhead Kit (06) PAGE E---9..........................................................
Rotor/Shaft Assembly (03) PAGE E---9..................................................
Seal Installation (05) PAGE E--- 9........................................................
H e a d / I d l e r K i t PA G E E --- 9..............................................................
Coverplate Kit (11) PAGE E---10........................................................
Foot Bracket Kit (08) PAGE E---10.......................................................
Rotor Adjusting Sleeve (07) PAGE E---10................................................
SETTING END CLEARANCE PAGE E---10...................................................
R E L I E F VA LV E D I S A S S E M B LY PA G E E --- 1 1.................................................
RELIEF VALVE REASSEMBLY PAGE E---12..................................................
Relief Valve Installation (10) PAGE E--- 13................................................
SEAL APPENDIX --- SECTION F PAGE F---1...................................
Standard Friction Drive And Optional 60A, 60B And 61J Mechanical Seals PAGE F---1.............
StandardLip(AndOptional65C)Seal PAGEF---3.............................................
Positive Drive (Option 60D) And Metal Bellows (Option 60F, 61K) Seals PAGE F---5................
Double Friction Drive (Options 60J And 60K) Seals PAGE F---8.................................
Cartridge (Options 60M, 60N, 60P And 61L) Seals PAGE F---11.................................
Balanced Seal (Option 60Q) PAGE F---13....................................................
Friction Drive Mechanical Seal With Flush (Options 60T And 60U) PAGE F---15...................

OM--04352GHC 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.

GHC SERIESOM--04352
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.

GHC SERIES OM--04352
PAGE A -- 1
SAFETY
SAFETY --- SECTION A
This information is specific to Gorman-Rupp GHC
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 that 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--04352 GHC 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.

GHC SERIES OM--04352
PAGE B -- 1
INSTALLATION
INSTALLATION --- SECTION B
GENERAL INFORMATION
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
usewithwater.Somemodelswhenfitted
with specific options may be used with wa-
ter; consult the factory.
PUMP MODEL DESIGNATION
Following is a description of the model numbering
system for Gorman-Rupp rotary gear pumps.
Rotary gear pump model numbers include design
style, port size, hydraulic size and construction
code.
Typical Pump Model
GHS 1 1/2 GF 32
Design
Style
Port
Size
Hydraulic
Size
Construction
Code
Design Style: Gorman-Rupp rotary gear pumps
are available in five basic designs:
SG M C --- M e d i u m D u t y --- C o m p a c t
SG M S --- M e d iu m D u t y
SG H C --- H e a v y D u t y --- C o m p a c t
SG H S --- H e a v y D u t y
SG H A --- A b r a s i v e D u t y
Port Size: Gorman-Rupp rotary gear pumps are
available in port sizes from 1 to 6 inches, depend-
ing on the design style. Consult your Gorman-
Rupp distributor or the factory for additional sizes.
Hydraulic Size: The first letter in the hydraulic size
is a rotor diameter code. The second letter indi-
cates tooth length.
Construction Code: Construction Codes for Gor-
man-Rupp rotary gear pumps are as follows:
Code Description
3 Iron w/Mechanical Seal(s)
4Ironw/PackingorLipSeal(s)
9 316 SST w/Mechanical Seal(s)
10 316 SST w/Packing or Lip Seal(s)
32 Steel w/Mechanical Seal(s)
38 Steel w/Packing or Lip Seal(s)
Theoretical Displacement: Table B-1 indicates
theoretical displacement values for each hydraulic
size.
NOTE
Actual capacities and recommended shaft speeds
vary according to application. Consult your Gor-
man-Rupp distributor or the factory for addtional in-
formation.

GHC SERIESOM--04352
PAGE B -- 2 INSTALLATION
Ta b l e B - 1 . T h e o r e t i c a l D i s p l a c e m e n t
Hydraulic
Size
Theoretical Displacement
Per Revolution
Gallons Centimeters3
DC 0.00568 21.486
DE 0.00704 26.646
GC 0.00967 36.619
GF 0.01405 53.186
GH 0.01915 72.479
GJ 0.02317 87.700
JG 0.03579 135.49
JJ 0.05159 195.28
JL 0.07078 267.94
JP 0.10078 381.48
NK 0.10665 403.71
NM 0.14173 536.51
NP 0.17681 669.31
RM 0.24030 909.65
RP 0.29979 1134.8
RR 0.35927 1360.0
RS 0.41876 1585.1
SR 0.65752 2489.0
SU 1.10240 4173.2
TU 1.91280 7240.7
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.
STORAGE
Due to the extreme close machining toler-
ances within rotary gear pumps, proper
storage before installation is essential to
prevent damage to the pump.
If the pump will not be immediately installed, follow
these procedures or damage to the pump will oc-
cur.
a. Do not flush the pump. Ensure that the port
plugs shipped with the pump remain in place
until piping is installed to help prevent dust or
other foreign objects from entering the pump.
b. Pumps that will not be installed for an ex-
tended period should be stored indoors if
possible. The factory-installed port plugs will
not ensure protection from excessive humid-
ity, splash water or rain. In very humid or wet
conditions, install air-tight plugs in the ports
and fill the pump completely with a lubricating
preservative liquid that is compatible with the
liquid to be pumped.
c. Pumps stored outdoors must be fully pre-
served as described above, completely cov-
ered with plastic or other water-tight material,
and the covering anchored to ensure that it
will not be blown off.
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.

GHC SERIES OM--04352
PAGE B -- 3
INSTALLATION
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
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 180_housing; if you have selected a 90_
housing port option, your port positions will be dif-
ferent.
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.
Begin piping layout at the pump, and work toward
the source of supply and the point of discharge. If
an obstacle is in the way of a suction or discharge
line, run the piping around the obstruction, not
over it. Running piping over an obstruction will
creat an air pocket which will make priming more
difficult.
If possible, slope the piping toward the pump so no
air or liquid is trapped in the piping. If a long hori-
zontal suction line is necessary, install the line be-
low the liquid level whenever possible in order to
keep the piping full of liquid. This will make priming
easier because the pump will not have to remove
as much air in the line.
Housing Position Std. 180_Pump
(3---9 O’clock) Housing Mounted Relief Valve
STD.
OPT.
Rotation Clockwise
Drive End Front End
Rotation Counter-clockwise
01A
Figure B-1. Typical Port Positions & Rotation

GHC SERIESOM--04352
PAGE B -- 4 INSTALLATION
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.
Gauges
Install a vacuum gauge in the suction line and a dis-
charge pressure gauge in the discharge line (both
should be as close as possible to the pump) to
monitor operation and assist in troubleshooting.
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.
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.
Barrier Liquids for Dual Mechanical Seals
Pumps equipped with dual (tandem) mechanical
seals require a barrier liquid to prevent contamina-
tion of the seal assembly by the liquid being
pumped. The barrier liquid must have the following
characteristics:
a. The barrier liquid must have sufficient lubricat-
ing characteristics, including an optimum vis-
cosity of 1 to 5 cSt at the temperature of the
liquid being pumped.
b. The barrier liquid must be compatible in all re-
spects with all pump and seal components to
which it will be exposed.
c. The barrier liquid must be compatible in all re-
spects with the liquid being pumped.
Pumps equipped with dual mechanical seals re-
quire the barrier liquid to be supplied at a continu-
ous pressure equivalent to the maximum dis-
charge pressure in order to avoid inboard seal face
separation. The maximum barrier liquid pressure
that can be applied depends primarily on the maxi-
mum seal design pressure (consult the factory).
Do not pressurize tandem seals. Pressurizing a
tandem seal will cause the seal faces to separate,
resulting in leakage and/or damage to the seal.
Refer to the appropriate section in Seal Appendix,
Section F for your specific seal option for operating
instructions for the barrier liquid reservoir kit.

GHC SERIES OM--04352
PAGE B -- 5
INSTALLATION
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.
V-Belt Drives
When using V-belt drives, the power source and
the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that they
are properly aligned (see Figure B-4). In drive sys-
tems using two or more belts, make certain that the
belts are a matched set; unmatched sets will cause
accelerated belt wear.
MISALIGNED:
SHAFTS
NOT P
A
R
A
LLEL
MISALIGNED:
SHAFTS
NOT IN LINE
ALIGNED: SHAFTS
PARALLEL AND
SHE
A
V
ES IN LINE
Figure B-4. V-belt Alignment
Tighten the belts in accordance with the belt man-
ufacturer’s instructions. If the belts are too loose
they will slip; if they are too tight, there will be ex-
cessive power loss and possible bearing failure.

GHC SERIESOM--04352
PAGE B -- 6 INSTALLATION
Select pulleys to match the proper speed ratio;
overspeeding the pump may damage both pump
and power source.
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.
V-BELT TENSIONING
General Rules of Tensioning
For new v-belts, check the tension after 5, 20 and
50 hours of operation and re-tension as required
(see the following procedure for measuring belt
tension). Thereafter, check and re-tension if re-
quired monthly or at 500 hour intervals, whichever
comes first.
Ideal v-belt tension is the lowest tension at which
the belt will not slip under peak load conditions. Do
not over-tension v-belts. Over-tensioning will short-
en both v-belt and bearing life. Under-tensioning
will cause belt slippage. Always keep belts free
from dirt, grease, oil and other foreign material
which may cause slippage.
Tension Measurement
Correct v-belt tension can be achieved using a v-
belt tension tester and Table B-2 or B-3. Use the
tables to find the v-belt size (cross-section), the
smallest sheave diameter, the belt type for your ap-
plication. The corresponding deflection force re-
quired for new or used belts is shown opposite the
RPM range of the pump.
Belt Span
Deflection
Figure B-5. Belt Tension Measurement
The ratio of deflection to belt span is 1:64 for both
ASA and metric units. Therefore, a belt with a span
of 64 inches would require a deflection of 1 inch at
the force shown on the Tables for your particular
application.
For example, if the span as measured in Figure B-5
is 32 inches (813 mm), the v-belt cross-section is C,
the smallest sheave diameter is 8 inches, the pump
speed is 1250 RPM, and the belts are uncogged
Yy-T type, then 11.5 lbs. of force on the tensioner
should show 1/2-inch (12,7 mm) of deflection.
A tension tester is available as an option from Gor-
man-Rupp (P/N 29513---001). Other tension test-
ers are available from your local belt/sheave dis-
tributor, and work on a similar principal.
To use the Gorman-Rupp tensioner, measure the
belt span as shown in Figure B-5. Position the bot-
tom of the large O-ring on the span scale of the ten-
sioner at the measured belt span. Set the small O-
ring on the deflection force scale to zero.
Place the tension tester squarely on the belt at the
center of the belt span. Apply force on the plunger,
perpendicular to the belt span, until the bottom of
the large O-ring is even with the top of the next belt,
or with the bottom of a straight edge laid across the
sheaves.
Read the force applied from the bottom of the small
O-ring on the deflection force scale. Compare this
forcewiththevalueshowninTableB-2orB-3and
adjust the tension accordingly. Note that the ten-
sion for new belts is higher than that for used
belts to allow for expected belt stretching. Do not
over-tension used belts to the higher deflection
forces shown for new belts.

GHC SERIES OM--04352
PAGE B -- 7
INSTALLATION
Cross
Section
Smallest
Sheave
Diameter
Range
R.P.M.
Range
Used
Belt
New
Belt
Used
Belt
New
Belt
Belt Deflection Force
Uncogged
Hy-T Belts &
Uncogged
Hy-T Torque
Te a m
Cogged
To r q u e -F l e x
&Machined
Edge torque
Te a m B e l ts
A,AX
3.0 - 3.6 1000-2500
2501-4000
3.7
2.8
5.5
4.2
4.1
3.4
6.1
5.0
3.8 - 4.8 1000-2500
2501-4000
4.5
3.8
6.8
5.7
5.0
4.3 7.4
6.4
5.0 - 7.0 1000-2500
2501-4000
5.4
4.7
8.0
7.0
5.7
5.1
9.4
7.4
B,BX
3.4 - 4.2 860-2500
2501-4000
4.9
4.2
7.2
6.2
4.4 - 5.6 860-2500
2501-4000
5.3
4.5
7.9
6.7
7.1
7.1
10.5
9.1
5.8 - 8.6 860-2500
2501-4000
6.3
6.0
9.4
8.9
8.5
7.3
12.6
10.9
C,CX
7.0 - 9.0 500-1740
1741-3000
11.5
9.4
17.0
13.8
14.7
11.9
21.8
17.5
9.5 - 16.0 500-1740
1741-3000
14.1
12.5
21.0
18.5
15.9
14.6
23.5
21.6
D
12.0 - 16.0 200-850
851-1500
11.5
9.4
17.0
13.8
14.7
11.9
21.8
17.5
18.0 - 20.0 200-850
851-1500
30.4
25.6
45.2
38.0
3V,
3VX
2.2 - 2.4 1000-2500
2501-4000
3.3
2.9
4.9
4.3
2.65 - 3.65 1000-2500
2501-4000
3.6
3.0
5.1
4.4
4.2
3.8
6.2
5.6
4.12 - 6.90 1000-2500
2501-4000
4.9
4.4
7.3
6.6
5.3
4.9
7.9
7.3
5V,
5VX
4.4 - 6.7
500-1749
1750-3000
3001-4000
10.2
8.8
5.6
15.2
13.2
8.5
7.1 - 10.9 500-1740
1741-3000
12.7
11.2
18.9
16.7
14.8
13.7
22.1
20.1
11.8 - 16.0 500-1740
1741-3000
15.5
14.6
23.4
21.8
17.1
16.8
25.5
25.0
8V
12.5 - 17.0 200-850
851-1500
33.0
26.8
49.3
39.9
200-850
851-1500
39.6
35.3
59.2
52.7
18.0 - 22.4
Cross
Section
Smallest
Sheave
Diameter
Range
R.P.M.
Range
Used
Belt
New
Belt
Used
Belt
New
Belt
Belt Deflection Force
Uncogged
Hy-T Belts &
Uncogged
Hy-T Torque
Te a m
Cogged
To r q u e -F l e x
&Machined
Edge torque
Te a m B e l ts
A,AX
75 - 90 1000-2500
2501-4000
1.7
1.3
2.5
1.9
1.9
1.5
2.8
2.3
91 - 120 1000-2500
2501-4000
2.0
1.7
3.1
2.6
2.3
2.0 3.4
2.9
125 - 175 1000-2500
2501-4000
2.4
2.1
3.6
3.2
2.6
2.3
4.3
3.4
B,BX
85 - 105 860-2500
2501-4000
2.2
1.9
3.3
2.8
106 - 140 860-2500
2501-4000
2.4
2.0
3.6
3.0
3.2
3.2
4.8
4.1
141 - 220 860-2500
2501-4000
2.9
2.7
4.3
4.0
3.9
3.3
5.7
4.9
C,CX
175 - 230 500-1740
1741-3000
5.2
4.3
7.7
6.3
6.7
5.4
9.9
7.9
231 - 400 500-1740
1741-3000
6.4
5.7
9.5
8.4
7.2
6.6
10.7
9.8
D
305 - 400 200-850
851-1500
11.3
9.6
16.8
14.2
401 - 510 200-850
851-1500
13.8
11.6
20.5
17.2
3V,
3VX
55 - 60 1000-2500
2501-4000
1.5
1.3
2.2
2.0
61 - 90 1000-2500
2501-4000
1.6
1.4
2.3
2.0
1.9
1.7
2.8
2.5
91 - 175 1000-2500
2501-4000
2.2
2.0
3.3
3.0
2.4
2.2
3.6
3.3
5V,
5VX
110 - 170
500-1749
1750-3000
3001-4000
4.6
4.0
2.5
6.9
6.0
3.9
171 - 1275 500-1740
1741-3000
5.8
5.1
8.6
7.6
6.7
6.2
10.0
9.1
276 - 400 500-1740
1741-3000
7.0
6.6
10.6
9.9
7.8
7.6
11.6
11.3
8V
315 - 430 200-850
851-1500
15.0
12.2
22.4
18.1
200-850
851-1500
18.0
16.0
26.8
23.9
431 - 570
TableB-2.SheaveDiameter (In.)
Deflection Force (Lbs.)
TableB-3.SheaveDiameter (Mm.)
Deflection Force (Kg.)
ELECTRICAL CONNECTIONS
Before connecting an electric motor to incoming
power, check that the electrical service available
matches the pump motor requirements stamped
on the motor nameplate.
The electrical power used to operate
this pump is high enough to cause inju-
ry or death. Obtain the services of a qu-

GHC SERIESOM--04352
PAGE B -- 8 INSTALLATION
alified electrician to make all electrical
connections.
Do not install and operate a non-explo-
sion proof motor in an explosive atmo-
sphere. Install, connect, and operate
the motor in accordance with The Na-
tional Electrical Code and all local
codes. If there is a conflict between the
instructions in the manual accompany-
ing the unit and The National Electrical
Code or the applicable local code, The
National or local code shall take prece-
dence.

GHC SERIES OM--04352
PAGE C -- 1
OPERATION
OPERATION --- SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
PUMP OPERATION
Never use a pressure relief valve to reg-
ulate liquid flow. Pressure relief valves
are designed as safety devices only.At-
tempting to regulate flow with a pres-
sure relief valve may cause the pump or
piping to explode, causing severe per-
sonal injury or death.
PRE-OPERATION
Make certain that all instructions in INSTALLA-
TION, Section B have been carried out.
The standard version of the pump is de-
signed to handle a wide range of light, me-
dium, and heavy viscosity liquids, depend-
ing on design and components. Do notop-
erate the pump with higher liquid tempera-
tures than what it was designed; otherwise,
pump components and operation may be
affected. For temperature range consult
The Gorman-Rupp Company.
Before Starting The Pump
Never operate the pump against a
closed suction or discharge valve. The
pump will overheat, and may rupture or
explode, causing personal injury or
death.
Open all valves in the suction and discharge lines,
and close all drain valves.
If your pump is equipped with a packing seal, loos-
en the gland nuts before starting the pump until the
packing gland may be moved slightly. If leakage
seems excessive after starting, wait until the pump
has run long enough to reach its normal operating
temperature before adjusting the gland nuts. Do
not over-tighten the gland nuts. Packing pumps
must leak slightly to cool and lubricate the shaft
and to allow the shaft to turn freely.
Consult the drive manufacturer’s operating manu-
al before attempting to start the drive.
In a suction lift application, fill the pump housing
with liquid to seal clearances and to lubricate the
pump.
Checking Pump Rotation
Correct rotation of your pump is shown on the
pump serial plate or direction arrow plate.
In applications with a single direction of
flow and a single pump-mounted pressure
relief valve, make certain that the drive unit
turns the pump in the correct direction of
rotation. Otherwise, the pump-mounted
pressure relief valve will not function.
Follow the drive unit manufacturer’s instructions,
jog the pump motor briefly, and check rotation.
If a 3-phase motor is being used and rotation is in-
correct, have a qualified electrician interchange
any two of the 3-phase wires to change the direc-
tion of rotation. If a 1-phase motor is being used
and rotation is incorrect, consult the motor man-
ufacturer’s literature.
STARTING
Start the drive unit as indicated in the manufactur-
er’s instructions and observe the suction and dis-
charge gauges. If the pump does not deliver liquid

OM--04352 GHC SERIES
PAGE C -- 2 OPERATION
within one minute, stop the drive unit. Do not oper-
ate the pump more than one minute without liquid
in it; dry operation will damage or destroy the
pump.
Although this pump is self-priming, never
operate it dry. Dry operation could cause
galling, seizing, damage to the seal or ex-
cessive wear of rotating parts.
Review the previous steps outlined in PRE-OP-
ERATION and review TROUBLESHOOTING,
Section D. If everything appears normal, add liquid
to the pump housing to assist priming and start the
driver again.
If the pump does not deliver liquid, stop the pump;
it may be necessary to vent the discharge line until
liquid begins to flow.
If the pump still does not deliver after consulting
TROUBLESHOOTING and venting the discharge
line, contact your local Gorman-Rupp Rotary Gear
Distributororthefactory.
OPERATION
NOTE
If the pump malfunctions or does not meet operat-
ing specifications, refer to TROUBLESHOOTING
--- S e c t i o n D .
A change in operating noise when liquid first enters
the pump is normal. After the pump is fully opera-
tional, monitor it for any unusual noises or vibra-
tion; if either occurs, shut the pump down immedi-
ately.
Liquid Temperature
Do not install the pump in a service with higher liq-
uid temperatures than what it was designed. Intro-
ducing hot liquid into a cold pump will expand
parts unevenly, causing excessive wear, pump fail-
ure, and operation may be affected. This thermal
shock can be reduced by gradually heating the liq-
uid being introduced into the pump. If it is not pos-
sible to heat the liquid, use heat tape and/or insula-
tion to heat the pump.
High temperature bushings as well as optional
jackets which may be used to heat or cool the
pump are available options for many models.
Overheating
Overheating can occur if the pump is operated with
valves in the suction or discharge lines closed. Op-
erating against closed valves could bring the liquid
to a boil, build pressure, and cause the pump to
rupture or explode. If overheating occurs, stop the
pump and allow it to completely cool before servic-
ing.
Do not remove plates, covers, gauges,
pipe plugs or fittings from an overheated
pump. Vapor pressure within the pump
can cause parts being disengaged to be
ejected with great force. Allow the pump to
completely cool before cooling.
Checking Gauges
Monitor vacuum and pressure gauge readings to
ensure that the pump is operating within normal
range and delivering full flow.
Strainer Check
If a strainer has been installed in the suction line,
monitor vacuum gauge readings to detect block-
age. Check the strainer if flow rate begins to drop.
Never introduce air or steam pressure
into the pump housing to remove a
blockage. This could result in personal
injury or damage to the equipment. If
backflushing is absolutely necessary,
limit liquid pressure input to 50% of the
maximum permissible operating pres-
sure shown in the pump performance
data.

GHC SERIES OM--04352
PAGE C -- 3
OPERATION
Leakage
No leakage should be visible at pump mating sur-
faces or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi-
mum efficiency.
If your pump is equipped with a packing seal, the
packing is lubricated by the liquid being pumped.
Some leakage around the packing seal is normal.
Packing pumps must leak slightly to cool and lu-
bricate the shaft and to allow the shaft to turn freely.
Wait until the pump has run long enough to reach
its normal operating temperature to adjust the
gland nuts. Adjust the nuts only tight enough to re-
duce excessive leakage.
PRESSURE RELIEF VALVE
ADJUSTMENT
Some pumps are not provided with a pressure re-
lief valve. A pressure relief valve must be installed
on the pump or in the discharge piping to ensure
safe operation. Otherwise, the pump may be dam-
aged and personnel injured.
If operating at high temperatures, allow the
pump to completely cool before attempt-
ing any adjustments.
Cracking Pressure
Cracking pressure is the pressure at which the
pressure relief valve first begins to open and by-
pass fluid. The nominal cracking pressure of the re-
lief valve provided with this pump is set at the facto-
ry and is indicated on the tag attached to the relief
valve.
If the nominal cracking pressure set at the factory
must be changed, see Table E-2 and instructions in
Section E - MAINTENANCE AND REPAIR.
Complete By-pass Pressure
Complete by-pass pressure is the maximum pres-
sure the pump will see when all the pumped fluid is
being by-passed through the pressure relief valve.
This pressure will vary depending on the cracking
pressure setting, liquid viscosity, and pump speed
(pump capacity).
To determine the complete by-pass pressure, refer
to the pump performance chart or consult the fac-
tory.
Do not remove the adjusting screw jam
nut; with the jam nut removed the relief
valve spring(s) can be compressed too
far for the valve to open. If the valve
does not open, excessive pressure can
develop, causing damage to the pump
and possible injury to personnel.
STOPPING
Ifthepumpwillbeoutofserviceforanextended
length of time, particularly when handling non-lu-
bricating liquids, drain the system and flush the
pump and piping with an oil-based preservative to
protect close-tolerance pump parts.
When handling liquids that solidify when at rest
(tar, glue, etc.), flush the pump and piping with an
approved solvent compatible with the pump com-
ponents and the liquids being pumped.

GHC SERIES OM--04352
PAGE D -- 1
TROUBLESHOOTING
TROUBLESHOOTING --- SECTION D
Review all SAFETY information in Section A.
Before attempting to open or service the
pump:
1. Familiarize yourself with this manual.
2. Allow the pump to completely cool if
overheated.
3. Check the temperature before open-
ing any covers, plates, or plugs.
4. Close the suction and discharge
valves.
5. Drain the pump.
TROUBLESHOOTING WITH GAUGES
Most pump or system malfunctions can be detected by installing vacuum suction and discharge pressure
gauges. Read the gauges and refer to the following information for interpretation of the gauge readings. For
additional troubleshooting procedures, see the TROUBLESHOOTING CHART.
Vacuum Gauges
HIGH READING
Suction valve closed, suction line blocked,
foot valve jammed, strainer blocked.
Liquid too viscous.
Lift too high.
Suction line undersized.
LOW READING
Air leak in suction line.
End of suction line not submerged.
Pump parts worn or defective.
End clearance too great.
No liquid in pump housing.
ERRATIC READING
Liquid overheated, vaporizing.
Liquid entering intermittently, suction air leak,
end of suction line not submerged.
Vibration from cavitation, misalignment, dam-
aged parts.
Pressure Gauges
HIGH READING
Liquid too viscous.
Discharge line undersized or too long.
Discharge valve partially closed.
Strainer blocked.
Relief valve pressure set too high.
Thermal changes in liquid.
LOW READING
Relief valve pressure set too low.
Internal valve not seating properly.
Pump bypass partially open.
End clearance too great.
Pump parts worn or defective.
ERRATIC READING
Cavitation.
Liquid entering intermittently, suction air leak,
end of suction line not submerged.
Drive misalignment causing vibration.

GHC SERIESOM--04352
PAGE D -- 2 TROUBLESHOOTING
TROUBLESHOOTING CHART
Shaft seal leaking; gaskets, O-rings
worn.
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP DOES
NOT DELIVER
RATED DIS-
CHARGE OR
CAPACITY
PUMP FAILS
TO PRIME OR
LOSES PRIME
Air leak in suction line; end of suction
line not submerged; foot valve blocked
or jammed; insufficient liquid in sump or
tank.
Check and correct as required.
Shaft seal leaking; gaskets, O-rings
worn.
Check vacuum gauge; disassemble
pump and replace faulty parts.
Leaking relief valve. Disassemble and repair.
Suction lift too high. See INSTALLATION, SECTION B and
check piping.
Suction strainer clogged. Check strainer.
Pump rotation incorrect. See OPERATION, SECTION C and
check rotation.
Pump speed too slow. Check driver speed.
Check and correct as required.
Readjust.
Suction or discharge lines blocked;
suction or discharge valves closed.
Check strainer, valves and piping.
Air leak in suction line; end of suction
line not submerged; foot valve blocked
or jammed; insufficient liquid in sump or
tank.
Check vacuum gauge; disassemble
pump and replace faulty parts.
Relief valve pressure set too low.
Housing dry. Add liquid to housing, see OPERATION,
SECTION C.
Rotating parts worn or damaged; im-
proper end clearance.
Replace defective parts; see SETTING
END CLEARANCE in Maintenance And
Repair, Section E.
Pump speed too slow. Check driver speed; check belts/coup-
lings.
PUMP REQUIRES
TOO MUCH
POWER
Pump speed too high. Reduce driver output.
Internal parts worn. Disassemble pump and inspect.
Discharge line undersized and/or too
long.
Increase size, decrease length.
Pump “starving” or liquid vapor-
izing in suction line.
Increase suction pipe size or reduce
length; position pump below liquid level.
Pump “starving” or liquid vaporizing
in suction line.
Increase suction pipe size or reduce
length; position pump below liquid level.
Insufficient end clearances. Readjust clearance; see SETTING END
CLEARANCE in Maintenance and Re-
pair, Section E.
Internal clearance too great. Check and readjust clearance if re-
quired; see SETTING END CLEAR-
ANCE in Maintenance and Repair, Sec-
tion E.