RUTHMAN Gusher 7550 Series User manual

Installation,
Operation, and
Maintenance Manual
7550 Series
Vertical Pumps
GUSHER PUMPS, INC.
115 Industrial Drive
Williamstown, KY 41097
PHONE: [phone]
FAX: [phone]
www.Gusher.com
MODELS
52 Heavy Duty, 53 Heavy Duty & 54 Heavy Duty
Power Frames

Table of Contents
WARRANTY ................................................................................................................................... 03
RECEIVING AND INSPECTION .................................................................................................... 03
INSTALLATION.............................................................................................................................. 04
PUMP POSITIONING ......................................................................................................... 04
PIPE CONNECTION........................................................................................................... 04
IMPELLER ADJUSTMENT ................................................................................................. 04
COUPLING ALIGNMENT ................................................................................................... 04
MAINTENANCE ............................................................................................................................. 06
LUBRICATION .................................................................................................................... 06
COUPLING ALIGNMENT ................................................................................................... 07
DISASSEMBLY.............................................................................................................................. 07
CHAIR AND DRIVE MOTOR .............................................................................................. 07
BARREL AND DRIVE MOTOR........................................................................................... 07
PUMP.................................................................................................................................. 07
REASSEMBLY ............................................................................................................................... 08
BEARING INSTALLATION ............................................................................................................ 08
TROUBLESHOOTING ................................................................................................................... 11
EXPLODED VIEWS........................................................................................................................ 12
52, 53 & 54V HEAVY DUTY POWER FRAME CENTERLINE MODELS ........................... 12
52, 53 & 54V HEAVY DUTY POWER FRAME NON-CENTERLINE MODELS .................. 13
MAINTENANCE HISTORY ............................................................................................................ 14
ENGINEERING DATA.................................................................................................................... 15
HEAD & PRESSURE FORMULA ....................................................................................... 15
NET POSITIVE SUCTION HEAD ....................................................................................... 15
PRESSURE EQUIVALENT TABLE .................................................................................... 15
FLOW EQUIVALENTS........................................................................................................ 15
VOLUME & WEIGHT EQUIVALENTS ................................................................................ 15
VACUUM PRESSURE EQUIVALENTS.............................................................................. 15
VISCOSITY CONVERSION TABLE ................................................................................... 16
MEASUREMENT CONVERSION CHART.......................................................................... 16
PIPE FRICTION CALCULATION........................................................................................ 17
NOZZLE DISCHARGE........................................................................................................ 18
This Installation, Operation, and Maintenance manual is designed to help you get the best performance
and longest life from your Gusher 7550 Series vertical end suction centrifugal pump.
If there are any questions regarding the pump or its applications which are not covered in this manual,
or in other literature accompanying this unit, please contact your Gusher distributor, or contact:
Gusher Pumps
115 Industrial Road
Williamstown, KY 41097
Phone: [phone]; Fax: [phone]
Email: [email protected]
www.Gusher.com
For information or technical assistance on the power source, contact the power source manufacturer’s
local dealer or representative.

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WARRANTY
Gusher Pumps, Inc. will replace or repair, within one year of shipment from our plant, any pump that, in
our judgment, has failed due to defects in materials or workmanship, provided the pump has been
properly installed and maintained and has not been subject to abuse.
These pumps must return to Gusher Pumps, Inc. with complete history of service for inspection and
warranty consideration.
Gusher Pumps, Inc. does not accept the responsibility for transportation to and from our plant.
Furthermore, we do not assume any responsibility for consequential damage or loss of production.
WARRANTY IS ONLY VALID WHEN GENUINE GUSHER PARTS ARE USED.
RECEIVING AND INSPECTION
The utmost care has been taken at the factory
to assure proper coupling alignment and
impeller adjustment. However, due to
circumstances beyond our control, YOU MUST
inspect the pump upon receipt and follow the
installation instructions completely before start-
up.
RECEIVING:
1. Rotate shaft by hand. If it does not rotate
freely:
A. Check impeller adjustment.
B. Check for bent coupling guard.
C. Check slinger.
D. Check for bent shaft.
2. Check for cracked or damaged parts. If
upon receipt, you find the pump damaged,
file a claim with the delivering carrier.
3. If drive motor has been supplied, check the
rpm and horsepower to be sure it is correct
as ordered.
4. Check the pump name tag to be sure you
have received the pump as ordered:
A. Model Number
B. Head in feet (Ft. Hd.)
C. Gallons per minute (gpm)
D. Construction:
a. All iron.
b. All iron with stainless steel shaft and
impeller.
c. All stainless steel.
5. If there is anything that appears to be
incorrect, call the factory immediately.

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INSTALLATION
After careful preliminary inspection, you may
proceed with the installation of the pump into
your system.
A. Lower the pump into tank, making sure the
mounting plate rests firmly on a proper
support structure. The cover plate must be
mounted level and remain at least 1” above
high liquid level at all times. Appropriate
shims may be used between the plate and
support structure to level cover plate.
B. Secure mounting plate by using hold-down
screws in all four corners. Again, care must
be taken to make sure plate is firm and
level. DO NOT force bowed plate level. Use
metal shims if necessary.
C. Making pipe connections:
1. Extreme care must be taken to support
piping without causing any strain on the
pump.
2. Install pipe hanger on the discharge
pipe so all piping weight is supported by
the hanger and not be the pump or the
casing.
3. Bolt holes must line-up without prying to
insert bolts.
4. When tightening flange bolts, pipe
flanges must not be forced together.
5. Check valve should be placed in
discharge line between gate valve and
pump discharge pipe to prevent liquid
from running back through the pump
and causing reverse rotation. This is
extremely important in applications with
intermittent duty where the pump may
be rotating backwards when service is
resumed. This will cause damage to the
pump and the drive motor.
6. Pressure gauge should be located at the
pump discharge, as all performance
data is taken at pump discharge.
7. If intake piping is used to pump the tank
down, it must also be supported
independently of the pump.
D. Once piping is installed, remove coupling
guard and rotate pump shaft by hand. Pump
should rotate freely at this point. If it does
not, check for:
1. Piping strain: without exception, piping
must not rest on pump in any manner.
(See 4, above for pipe connection info.)
2. Impeller adjustment-standard pump; for
high speed pump impeller adjustment,
contact factory. (Fig.1):
a. Disconnect coupling (#32) and
remove sleeve (#32a).
b. Loosen three locking screws (#57).
c. Loosen three adjusting screws
(#55).
d. Lightly tap shaft (#1) until impeller
bottoms on the intake flange.
e. Tighten three adjusting screws by
hand until they touch ball bearing
housing.
f. Tighten three adjusting screws just
up to the point where the shaft turns
freely; then tighten each screw an
additional ¼ turn.
g. Tighten locking screws (#57) and
jamb nuts (#56).
h. Rotate coupling by hand to be sure
impeller does not rub intake flange.
If impeller does rub, repeat steps a
through g.
i. Connect Coupling.
Fig. 1
3. Slinger adjustment: The slinger is set at
the factory and normally causes no
problems, but should be checked when
unit is inspected upon arrival at your
plant site and before unit is lowered into
position in your system.
E. Coupling alignment (Chair Mounted Model
ONLY): MUST BE CHECKED before and
after system start-up.
1. Check Parallel Alignment (Fig. 2) by
placing a straight- edge across the two
coupling flanges and measuring the
maximum offset at various points
around the periphery of the coupling. If

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the maximum offset exceeds .010”,
realign the coupling.
Fig. 2
2. Check Angular Alignment (Fig. 3) with
a micrometer or caliper. Measure from
the outside of the one flange to the
outside of the other at intervals around
the periphery of the coupling. Determine
the maximum and minimum dimensions.
DO NOT rotate. The difference between
the maximum and the minimum must
not exceed .010”. If a correction is
necessary, be sure to recheck the
parallel alignment.
Fig. 3
3. If coupling alignment is out, adjustment
can be made by the following steps:
a. Lateral Parallel Misalignment is
adjusted by loosening the four motor
retaining bolts (#49) (Fig. 4) after
which you loosen the lateral
adjusting screws (#58) (Fig. 5) on
the side of the motor that has to be
shifted and tighten the remaining
lateral adjustment screws until
lateral parallel alignment is
achieved. (Fig. 5) If misalignment is
out more than .020” see step e.
Fig. 4
b. Horizontal Parallel Misalignment
is adjusted by loosening the four
motor retaining bolts (#49) (Fig. 4)
after which you add or subtract
shims from between motor base and
motor support pads (#50) (Fig. 5). If
more than 0.1875” total shims are
required or alignment cannot be
achieved without any shims, see
step v. Tighten all screws before
operating pump.
c. Lateral Angular Misalignment is
adjusted by loosening the four motor
retaining bolts (#49) (Fig. 4)after
which you loosen the angular
alignment screws (#59) (Fig. 5) on
the side of motor that has to be
lowered and tighten the angular
alignment screws on side of motor
that has to be raised, until angular
alignment is achieved. (Fig. 5)
Tighten all screws before operating.
d. Horizontal Angular Misalignment
is adjusted by loosening the four
motor retaining bolts (#49) (Fig. 4)
after which you add or sub- tract
shims from between motor base and
motor support pads (#50) (Fig. 4).
Tighten all screws before operating
pump.
e. If lateral alignment and horizontal
parallel alignment cannot be
achieved with the above steps use
the following operation:
Loosen nuts or screws that hold
bearing housing to mounting
plate.

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Tap ball bearing housing with
lead hammer to move coupling
into alignment.
If unable to align coupling by
tapping the ball bearing housing
then insert a prybar between the
ball bearing housing and the
burned out hole in the mounting
plate and shift coupling into
alignment by prying housing
from one position to another as
required.
Tighten all screws before
operating pump.
Fig. 5
! NOTE !
DO NOT loosen the four motor screws
too much, as this will cause difficulty
when trying to align coupling. Motor
screws must be snug so a slight force
must be applied to move motor.
If an adjustment in either parallel or
angular alignment is required, you must
check both after adjustment is made.
Coupling alignment must be checked
after system has been operating for 300
hours. Then as a preventative
maintenance procedure, it should be
checked every 1200 hours of normal
operation. More severe duty operation
requires more frequent attention.
f. Electrical connections should
conform with state and local codes.
(It is advised to use approximately 4’
length of flexible conduit to facilitate
removal of chair, if repair is
required.)
Upon initial start-up, pumps may seem to run
tight and hot. This is caused by the breaking in
of oil seals and ball bearings. Pump will operate
normally after approximately 150 hours of
service.
Ball bearings should not run over 225°F. When
checking temperature, use a pyrometer.
MAINTENANCE
A. Lubrication: All 7550 pumps are grease-
lubricated. The initial grease lubrication is
done at the factory prior to shipment.
Additional lubrication should not be required
for approximately 1200 hours of operation if
run at 1750 rpm, or 600 hours if run at 3450
rpm.
A well-planned maintenance schedule can
only be devised after careful observation of
the pump for the first six months of
operation and the lubrication that has been
required. Each pump installation is unique
and requires a different lubrication schedule
compatible with that specific operation.
! NOTE !
DO NOT mix grease types as it will cause
bearing failure (e.g. lithium/oil base).
Use Chevron SRI #2 ball bearing grease, or
equivalent. If any other grease is used, the
initial fill grease must be purged from the
system prior to installing a suitable
alternative grease.

7
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! NOTE !
DO NOT OVER GREASE as it will cause
ball bearings to run hot.
Upon initial startup, bearings may seem to
run tight and hot. This is caused by the
breaking in of oil seals and ball bearings.
Pump will operated normally and bearing
temperatures should drop after
approximately 150 hours of service.
Bearings should not run over 225°F.
! CAUTION !
DO NOT LUBRICATE A PUMP IN
OPERATION. Shut down pump prior to
lubrication.
To lubricate:
A. Shut down pump.
B. Remove relief from back of ball
bearing housing.
C. Fill with grease until fresh grease
flows from opening.
D. If automatic lubrication system is
being used, reliefs must be placed in
the tapped hole (1/8” N.P.T.).
B. Coupling Alignment: This must be
checked before and after system start-
up; after 300 hours of operation; and
again after 1200 hours of operation.
Follow procedure given in Step F of the
INSTALLATION section of this manual.
Again, we recommend strongly that a
routine preventative maintenance
schedule be devised and followed to
achieve optimum life and performance
of the pump.
DISASSEMBLY
CHAIR AND DRIVE MOTOR
A. Disconnect electrical leads. During
installation it was advised to allow sufficient
flexible conduit (approximately 4 feet) to
allow removal without disconnection of
electrical leads.
B. Remove coupling guard.
C. Disconnect coupling.
D. Remove four motor retaining bolts. Motor
can now be removed from chair.
E. Break welds loose that hold discharge pipe
cover plate to mounting plate.
F. Remove bolts & nuts that hold discharge
pipe to impeller housing.
G. Remove discharge pipe.
On 52VHD Power Frame:
1. Remove bolts, nuts & washer that hold
chair to stem.
2. Remove chair from pump.
On 53VHD & 54VHD Power Frames:
1. Remove Intake Flange. (not applicable
on all models)
2. Remove impeller housing.
3. Remove impeller retaining nut.
4. Remove impeller retaining washer. (not
applicable on all models)
5. Remove impeller.
6. Remove impeller drive and tape it to the
hub of the impeller so it will not get lost.
7. Loosen set screws in slinger.
8. Remove stem plate. (not applicable on
all models)
9. Remove stem.
10. Remove power frame assembly from
chair.
BARREL AND DRIVE MOTOR
A. Disconnect electrical leads. During
installation it was advised to allow sufficient
flexible conduit (approximately 4 feet) to
allow removal without disconnection of
electrical leads.
B. Remove coupling guard.
C. Disconnect coupling.
D. Remove bolts that hold barrel to bearing
housing.
E. Remove barrel & motor from power frame.

8
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PUMP
! NOTE !
READ ALL instructions thoroughly before
beginning disassembly.
A. 52VHD Barrel Mount or Chair Mount
1. Follow Chair/Barrel and Drive Motor
instructions above.
2. Remove bolts nuts and washers that
hold discharge pipe to the impeller
housing. Remove bolts, nuts and
washers that hold mounting plate to
stem. Remove mounting plate
(barrel mount only).
3. Remove intake flange (not
applicable on all models)
4. Remove impeller housing.
5. Remove impeller retaining screw.
6. Remove impeller retaining washer.
7. Remove impeller.
8. Remove impeller drive key. Tape it
to the hub of the impeller so it will
not get lost.
9. Loosen set screw in slinger.
10. Remove stem plate. (not applicable
on all models)
11. Remove stem.
12. Remove ball bearing retainer.
13. Slide shaft, telescoping ball bearing
housing, ball bearing, grease and
radial bearing retainer and radial
bearing out of bearing housing as
one unit.
14. Remove ball bearing lock nut from
shaft.
15. Remove ball bearing from shaft.
16. Remove telescoping ball bearing
housing from shaft.
17. Remove oil seal from telescoping
ball bearing housing.
18. Remove grease and radial ball
bearing retainer and radial ball
bearing together from shaft.
19. Remove oil seal from ball bearing
housing.
a. Remove throttle bushing
retainer. (not applicable on all
models)
b. Remove throttle bushing.
B. 53VHD & 54VHD Chair Mount
1. Follow Chair and Drive Motor
instructions above.
2. Remove 3 bolts.
3. Slide shaft, ball bearing retainer, thrust
ball bearing and radial ball bearing out
of ball bearing housing as one unit.
4. Remove ball bearing retainer.
5. Slide telescoping ball bearing housing
down off of the thrust bearing.
6. Remove ball bearing housing from shaft.
7. Remove thrust ball bearing from shaft.
8. Slide telescoping ball bearing housing
off shaft.
9. Remove bearing and grease retainer
and radial ball bearing from shaft.
Remove both at the same time so as not
to damage retainer.
10. Remove oil seal from telescoping ball
bearing housing.
11. Remove oil seal from ball bearing
housing.
12. Remove throttle bushing retainer. (not
applicable on all models)
13. Remove throttle bushing.
C. 53VHD & 54VHD Barrel Mount
1. Follow Barrel Mount and Drive Motor
instructions above.
2. Break welds loose that hold discharge
pipe cover plate to mounting plate.
3. Remove bolts and nuts holding
discharge pipe to impeller housing.
4. Remove discharge pipe.
5. Remove intake flange. (not applicable
on all models)
6. Remove impeller housing.
7. Remove impeller retaining nut.
8. Remove impeller retaining washer. (not
applicable on all models)
9. Remove impeller.
10. Remove impeller drive key and tape it
to the hub of the impeller so it will not
get lost.
11. Loosen set screws in slinger.
12. Remove stem plate. (not applicable on
all models)
13. Remove stem.
14. Remove power frame from mounting
plate.
15. Remove 3 bolts.
16. Slide shaft, ball bearing retainer, thrust
ball bearing and radial ball bearing out
of ball bearing housing as one unit.
17. Remove ball bearing retainer.
18. Slide telescoping ball bearing housing
down off of the thrust bearing.

9

19. Remove ball bearing lock nut from shaft.
20. Remove thrust ball bearing from shaft.
21. Slide telescoping ball bearing housing
off shaft.
22. Remove bearing and grease retainer
and radial ball bearing from shaft.
Remove both at the same time so as not
to damage retainer.
23. Remove oil seal from telescoping ball
bearing housing.
24. Remove oil seal from ball bearing
housing.
25. Remove throttle bushing retainer. (not
applicable on all models)
26. Remove throttle bushing.
.
REASSEMBLY
To reassemble pump, reverse the disassembly
steps while making sure of the following:
1. For bearing installation see next section.
2. Check grease seals for wear. Replace if
worn.
3. Install retainer and telescoping ball bearing
housing on shaft. Before putting bearing on
shaft.
4. Install slinger on shaft while connecting
stem to bearing housing.
5. Check throttle bushing for wear. Replace if
worn.
! NOTE !
There are two different versions of throttle
bushings. One is a TEFLON TYPE that has a
retainer. The other is a CARBON TYPE that is
pressed in place.
6. Clearance between impeller and housing or
intake flange should not exceed .015”. To
adjust clearance see INSTALLATION,
section 5B (for SE models only).
! NOTE !
Certain models have an enclosed impeller.
These models are supplied with a carbon wear
ring that is press fitted into the intake flange.
Upon disassembly check the wear ring for
wear. Replace if worn.
BEARING INSTALLATION
! NOTE !
Begin by cleaning your work area thoroughly,
contaminants can cause bearing failures.
When a bearing is installed, the mounting force
should be applied against the ring, and only the
ring, which is being press-fitted. A bearing
should never be forced onto a shaft by pressure
or hammer blows applied to the other ring, nor
should the bearing be press-fitted into housing
by force applied to the inner ring.
Using an arbor press, the bearing may be laid
on a face block which contacts only the bearing
inner ring and which has a hole diameter
greater than the bearing bore (Fig. 6). The shaft
is pressed through the bearing until it is seated
firmly against the shaft shoulder.
Fig. 6
If the shaft is not too long, it can be supported
beneath the table of the arbor press and the
bearing pressed onto it by ram pressure against
a piece of soft metal tubing (Fig. 7). The tubing
must be clean, inside and out, and the diameter
of the tubing should be slightly greater than the
bearing journal. The end of the tubing should be

10
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square (with corners chamfered to avoid
flaking) and should contact only the bearing
inner ring. The shaft must be held in line with
the ram of the arbor press to avoid cocking the
bearing on the shaft seat.
Fig. 7
When an arbor press is not available, the
bearing can be driven onto the shaft seat by
light hammer blows against the end of the soft
metal tubing. These blows should be made
alternately against opposite sides of the tubing
face, and great care must be taken to avoid
cocking the bearing as it is driven onto the shaft
seat.
When a ball bearing is installed into the housing
it is normally a slip fit, however if force is
necessary to install bearing, the force should be
exerted on the outer ring of the bearing (Fig. 8).
Again the force must be applied evenly so as
not to cock the bearing in the bore.
Fig. 8