Service Instruction No. 22
INSTALLATION AND SERVICE
INSTRUCTIONS
FOR
C SERIES PUMPS
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General Description
Models C2E, C2EN, C2F, and C2FA:
Model C2E and C2F pumps are sleeve bushing lip seal units designed for direct drive
service. Model C2E comes with the foot assembled to the pump. Model C2F is a flange mount
pump. Model C2FA pumps are similar to model C2F but are supplied without a seal. Model
C2EN pumps are sleeve and ball bearing units with a lip seal and mounting foot designed for
indirect (belt, chain, gear) drive.
The seal chamber on these pumps is vented to the suction side of the pumping zone.
Therefore, the pump must operate in the direction for which it is assembled.
All models are available in five sizes, ranging in capacity from 6 to 84 gpm with
differential pressures to 100 psi. The maximum discharge pressure capability is 100 psi.
Model C2B:
Model C2B is a flange mount pump with two sleeve type bushings and a mechanical
seal. The seal chamber on these pumps is vented to the suction side of the pumping zone.
Therefore, the pump must operate in the direction for which it is assembled. This pump is
available in five sizes, with capacities from 6 to 84 gpm and differential pressures to 150 psi.
The maximum discharge pressure capability is 300 psi. A mounting foot is optional.
Model C2G:
Model C2G is equipped with spring loaded V type graphite impregnated Teflon packing.
Model C2G pumps have the packing chamber vented to the suction side of the pumping zone.
Therefore, the pump must operate in the direction for which it is assembled. Model C2G is
available in five sizes, ranging in capacity from 6 to 84 gpm with differential pressures to 100
psi. The maximum discharge pressure capability is 125 psi.
Model CK1B:
Model CK1B pumps are equipped with a mechanical seal and incorporate heavy-duty
features, including special double bearing construction with an inboard double ball bearing and
an outboard roller bearing. This pump is available in five sizes, with capacities from 6 to 84 gpm
and differential pressures to 250 psi. The maximum discharge pressure capability is 300 psi. A
mounting foot is optional.
The seal chamber is vented to the suction side. Therefore, the pump must operate in the
direction for which it is assembled.
Model CC:
Model CC pumps are designed to mount directly to NEMA 56, 143TC or 145TC C
Face motors, with modifications available for mounting to metric C motors. They are
equipped with a mechanical seal and will pump equally well in either direction of rotation
(unless equipped with an internal relief valve).
These pumps are available in four sizes, with capacities from 6 to 30 gpm. They can
handle inlet pressures to 25 psi and differential pressures to 100 psi.
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The Pumping Principle
Tuthill C Series cast iron pumps employ
the internal gear pumping principle. There are
only two moving parts. Pumping action is
based on a rotor, idler gear, and crescentshaped partition cast integral with the cover.
Power applied to the rotor is transmitted to
the idler gear with which it meshes. The space
between the outside diameter of the idler and
the inside diameter of the rotor is sealed by
the crescent.
As the pump starts, the teeth come out of
mesh, increasing the volume. This creates a
partial vacuum, drawing the liquid into the
pump through the suction port.
The liquid fills the spaces between the
teeth of the idler and the rotor and is carried
past the crescent partition through the
pressure side of the pump.
When the teeth mesh on the pressure side,
the liquid is forced from the spaces and out
through the discharge port.
WARNING
Failure to follow these instructions could result in serious bodily injury or death.
These pumps should not be used for handling plain water, corrosive or abrasive liquids or
liquids not possessing adequate lubricity.
Do not attempt to work on any Tuthill pump installation before completing the steps below.
Disconnect the drive so that it cannot be started while work is being performed.
Review the Material Safety Data Sheet (MSDS) applicable to the liquid being pumped to
determine its characteristics and the precautions necessary to ensure safe handling.
Vent all pressure within the pump through the suction or discharge lines.
All Tuthill pumps contain residual 200 SSU lube oil from the factory production test.
Determine if this is compatible with the fluid you are pumping. If the fluid is incompatible, consult
the factory.
WARNING
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Most Tuthill C Series pumps are required to develop 25" mercury vacuum at 0 psi on
factory test. While these pumps will develop as high as 27" of vacuum, it is a sound engineering
practice to avoid extreme vacuum whenever possible. Select a pipe size to reduce line friction
loss to a minimum.
The pump should be located as close to the source of supply as conditions permit and if
possible, below the level of the liquid in the reservoir. When necessary to locate the pump in a
pit, provisions should be made to safeguard against flooding. Care must be taken to properly
support the suction and discharge piping so that no strain is put on the pump due to either
weight or expansion. Piping strain can result in misalignment, hot bearings, worn couplings, and
vibration. It is important that the piping used be clean and free of chips and scales.
Proper Installation
Unsatisfactory pump installations are usually characterized by poor suction conditions
for the specific liquid being handled. Suction conditions should be minimized to prevent
vaporization of the liquid. If vacuum conditions force the liquid to vaporize, cavitation will occur,
resulting in loss of capacity, premature wear and noisy operation.
When handling high viscosity liquids, the speed of the pump must be reduced and the
size of the lines increased to prevent cavitation.
Note:
Pipeline friction increases at a rapid rate with an increase in viscosity. For a given pump
and motor, larger pipelines are necessary to maintain the same pump pressure when changing
from a thin fluid to a thick one.
Most Tuthill C Series pumps are supplied with both ports on the same plane. Pumps with
this type of porting arrangement should always be installed with the ports facing upward to
insure proper priming. If it is necessary to install the pump with the ports pointing to either side,
it is recommended that the top port be the suction port. This will prevent gravity-induced
drainage of fluid through the suction port. When pipes are installed, an inverted "U" bend should
be incorporated into the suction line close to the pump for priming purposes.
Viewing the pump from the shaft end, the inlet port is on the right for clockwise rotation
and on the left for counter-clockwise rotation. On pumps with built in relief valves, the adjusting
screw of the valve must always be located on the suction side of the pump.
Pumps should be filled with oil at installation and should never be allowed to run dry.
Every pump installation should have a good foundation. Its structure should be
sufficiently strong to hold the pump rigid and to absorb any strain or shock that may be
encountered. The installation should be leveled, checked for proper piping alignment, and then
fastened securely.
Method of Drive
Direct drive through a traditional flexible coupling is recommended. (CC pumps are
direct driven by the motor shaft as an integral part of the pump.) However, do not expect the
flexible coupling to compensate for misalignment. Contact the coupling manufacturer to
determine the maximum amount of misalignment to which the coupling can be subjected.
All C Series pumps are directional (except CC Series without a relief valve). Rotation
must be specified at the time of order. The seal chamber communicates with the neutral zone
and therefore the seal/packing is subjected to approximately one half of the discharge pressure.
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All pump and motor units must be properly aligned during assembly and periodically
checked since misalignment may occur later due to abuse or other conditions. Pipe strain can
force the pump and motor shafts out of alignment. Therefore, all piping to the pump must be
properly supported. Do not allow the pump to act as a pipe support.
Provide for proper expansion of pipes when handling hot liquids. Allow pump to reach
operating temperature slowly. Rapid temperature change can result in damage to the cast iron
components.
Never align a pump and motor supplied with a pin type coupling without first removing
the pins. Never depend upon sight or feel. Use proper gauges when aligning the pump. Never
operate the pump without all guards in place.
Relief Valve Protection
All C Series models are positive displacement pumps. As the pump rotates, liquid is
positively delivered to the discharge side of the pump. If the discharge line is closed off,
pressure will increase until the drive stalls and/or fails, the pump breaks or ruptures, or the
piping bursts. To prevent this from happening, the use of a pressure relief valve is required. A
relief valve that directs the flow back to the supply tank is recommended.
The internal relief valve available on C Series pumps is designed for overpressure
protection only. It is not intended as a flow control device or for any similar use. Continuous
operation of the relief valve will result in excessive heat buildup within the pump cavity that
could cause serious internal damage. Make certain the adjusting screw of the relief valve is
located on the suction side of the pump.
Unless otherwise specified at the time of order, all C Series pumps with an internal relief
valve (except CC models) are supplied with the standard spring, with a range of 30-225 psi (10 200 psi in size 2 pumps), set to provide full bypass relief at 90 psi. The standard spring in CC
model pumps has a range of 0 -110 psi, set to provide full bypass relief at 100 psi.
To adjust the relief setting within the range of a given spring's capability:
• Remove the cap nut (model CC pumps only).
• With a small wrench, hold the adjusting screw steady.
• With a second wrench, loosen the locking nut by rotating counterclockwise.
• Throttle the outlet line until the differential pressure at the pump port reaches the desired
level.
• If the pressure fails to reach this level with the throttling valve closed, turn the adjusting
screw inward (clockwise) until the desired pressure is reached. (Adjusting clockwise
raises the pressure setting.)
• If the pressure reaches the desired level before the throttling valve is completely closed,
turn the adjusting screw outward (counterclockwise) until the desired pressure is
reached. (Adjusting counterclockwise lowers the pressure setting.)
• Retighten the nut to lock the setting in place.
• Replace the cap nut (model CC pumps only).
• Recheck the pressure gauge reading.
If an internal relief valve has not been supplied with the pump some other means of
protection must be utilized. These include in-line safety relief valves, pressure shutdown
switches or other similar devices.
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Strainer Protection
Strainers are used to remove contaminated particles from the fluid system and extend
pump life. Every pump should be protected from these particles by a strainer in the suction line.
Strainer size and mesh of screen are determined by the rate of flow and viscosity of the
fluid. Consult the strainer manufacturer for recommendations.
Never use a strainer with a built-in automatic by-pass on the suction line set to open
under 30" Hg. vacuum.
Install the strainer according to the designated direction of flow, locating it so that it is
accessible for servicing. Use a duplex type strainer when shutdown during service is not
possible.
Provide a vacuum gauge in the suction line for determining when the strainer requires
cleaning. Make certain strainer baskets are properly reinforced so as not to collapse under 30"
Hg. vacuum.
WARNING
All Tuthill pumps contain residual 200 SSU lube oil from the factory test. Determine if this is
compatible with the fluid you are pumping. If the fluid is incompatible, consult the factory.
If the pump is to operate at elevated temperatures, it should be brought up to operating
temperature gradually. Rapid or sudden introduction of liquid at an elevated temperature into
the cold liquid chamber of the pump could cause damage to the seal or other internal parts.
DO NOT RUN THE PUMP DRY. This could cause severe damage to the seal, bushing and/or
metal parts.
WARNING
Startup
Prior to starting the pump double check the following:
• Pressure and vacuum gauges should be installed as close as possible to the pump.
• Rotate pump shaft to ensure it turns freely without binding.
• Recheck alignment and ensure all guards are in place.
• Make sure piping is independently supported and no strain is being transmitted to the
pump.
• Make sure the safety relief valve is installed correctly.
• Check pump rotation.
• Open suction and discharge gate valves.
Check for any leaks once gate valves are open. After completing these checks the pump can be
started.
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WARNING
THE PUMP SHOULD NOT BE RUN DRY. If after approximately 60 seconds there is no
discharge of liquid, stop the pump and investigate the possible cause.
Failure to comply with this could cause severe damage to internal seals, bushings and/or metal
parts.
WARNING
Pump Performance Data
Size
Capacity (GPM) Size Capacity (GPM)
1C 3 CC009 9
2C 8 CC015 15
3C 17 CC020 20
4C 36 CC030 30
5C 61
6C 84
Based on pumping a fluid of 200
SSU viscosity at 50 psi and 1750
rpm
Based on pumping a fluid of 100
SSU viscosity at 50 psi and 1750
rpm
WARNING
Failure to follow these instructions could result in serious bodily injury or death.
Do not attempt to work on any Tuthill pump installation before completing the steps below.
Disconnect the drive so that it cannot be started while work is being performed.
Review the Material Safety Data Sheet (MSDS) applicable to the liquid being pumped to
determine its characteristics and the precautions necessary to ensure safe handling.
Vent all pressure within the pump through the suction or discharge lines.
All Tuthill pumps contain residual 200 SSU lube oil from the factory production test. Determine
if this is compatible with the fluid you are pumping. If the fluid is incompatible, consult the
factory.
WARNING
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Service – Specific Models
Model C2G
Lubrication:
Model C2G pumps are provided with a grease cup or grease gun fitting at the outer
bearing which also lubricates the packing. A good grade of medium cup grease, such as Fiske
Bros. Lubriplate #907, should be used. Apply until visible at the outer end of the packing gland.
If the pump is overheating, it may be due to lack of lubricant. Add lubricant as needed or at least
every 60 days or 500 hours of operation.
Repacking:
• Grip the pump firmly across the ports and secure the housing in a vise with the shaft
end up.
• Inspect the shaft at the flat and keyway area. Any burrs will interfere with removal of
the packing gland. Use a small, fine file if necessary.
• Remove the two packing gland screws at the shaft end and slide the packing gland
assembly off the shaft.
• Remove the old packing, packing retainer and spring.
• Inspect the shaft. If badly scored, the rotor must be replaced.
• Clean the packing chamber thoroughly. Carefully remove any sharp ridges from the
shaft end. This will eliminate possible damage to the lips of the packing and ease
installation.
• Replace the spring and packing retainer. Be certain that the spring is properly located
on the packing retainer and that the beveled surface of the packing retainer is facing
the shaft end of the pump.
• Install the V type packing rings. Rings should be installed separately and not in sets.
Three rings are required per pump. Exercise care when sliding the rings into place so
that the lips of the packing rings are stacked in line and positioned on the beveled
surface of the packing retainer ring.
• Replace the packing gland assembly and fasten it securely to the bracket assembly
with the packing gland screws. The tension of the spring is such that normal wear on
the packing is taken up automatically.
Models C2E, C2EN, C2F, and C2FA
Seal Replacement - Models C2E, C2EN and C2F:
• Grip the pump firmly across the ports and secure the housing in a vise with the shaft
end up.
• For model C2EN only: Loosen the setscrew on the collar of the outboard ball bearing.
While holding the pump shaft steady, turn the collar to loosen it. Remove the collar from
the shaft.
• Remove the gland cap screws and slide the seal gland off the shaft.
• Pry the seal from the housing cap and clean out the seal cavity with a cloth. Press the
new seal into the housing cap with the lip spring side facing the mounting face.
• Inspect the shaft. If badly scored at the seal area, the rotor must be replaced. Carefully
remove any sharp edges from the shaft and polish with crocus cloth or very fine
sandpaper. This will eliminate possible damage to the seal lip and ease installation.
• Install new O-ring into bracket if necessary.
• Apply a dab of petroleum jelly to the seal lip and install it over the shaft. (If the seal is
EPR, apply a silicon-based lubricant). The seal lip must retain its position on the shaft.
Work the seal gland up and down the shaft to make certain the seal lip slides freely.
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• Align the holes in the seal gland cap with the holes in the bracket and reinstall the
screws.
Model C2B
Seal Replacement:
• Grip the pump firmly across the ports and secure the housing in a vise with the shaft end
up.
• Remove any burrs or nicks on the shaft. Use a small, fine file if needed.
• Remove the seal gland cap screws.
• Slide the seal gland cap off the shaft.
• Remove the stationary seat of the seal from the seal gland.
• Slide the seal cartridge off the shaft.
• Polish the pump shaft with crocus cloth or very fine sandpaper and clean the seal
chamber thoroughly with a clean cloth. This will prevent damage to the new seal and
ease installation.
• Place the new seal cartridge on the shaft and slide into place.
• Install the new stationary seat into the seal gland.
• Place the bearing cap on the shaft and slide into place.
• Align the mounting holes and reinstall the seal gland cap screws.
Changing suction ports while maintaining shaft rotation
Models (includes pumps with reversing feature) C2F, C2FA, C2E, C2EN, C2G, C2B:
To maintain the same shaft rotation (clockwise or counterclockwise) and yet switch
suction and discharge ports please do the following.
• Looking at the pump from the shaft end with the ports up, note the location of the V
notch in the bracket. If at the top (12 o'clock), rotation is clockwise; if at the bottom (6
o'clock), counterclockwise.
• Remove the cover screws so that the bracket and cover move freely.
• Rotate the bracket and cover 180°.
• Align the mounting holes and reinstall the cover screws making sure the seal gland is
vented to the suction side of the pump.
V-Notch
• If outfitted with an internal relief valve (models C2FV, C2FAV, C2EV, C2ENV, C2GV,
and C2BV), the rotation cannot be changed in the field unless the cover/valve assembly
is also replaced.
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Changing shaft rotation while maintaining suction ports
Models C2F, C2FA, C2E, C2EN, C2G, C2B:
To maintain the same suction port and yet change shaft rotation from clockwise to
counter-clockwise or vice versa please do the following.
• Looking at the pump from the shaft end with the ports up, note the location of the V
notch in the bracket. If at the top (12 o'clock), rotation is clockwise; if at the bottom (6
o'clock), counterclockwise.
• Remove the cover screws so that the cover moves freely.
• Rotate the cover 180°.
• Align the mounting holes and reinstall the cover screws making sure the seal gland is
vented to the suction side of the pump.
V-Notch
Changing suction ports while changing shaft rotation
Models (includes pumps with reversing feature) C2F, C2FA, C2E, C2EN, C2G, C2B:
To change suctions ports and change shaft rotation (clockwise or counterclockwise)
please do the following.
• Looking at the pump from the shaft end with the ports up, note the location of the V
notch in the bracket. If at the top (12 o'clock), rotation is clockwise; if at the bottom (6
o'clock), counterclockwise.
V-Notch
Typical clockwise pump
Clockwise shaft rotation
Suction Discharge
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• Remove the cover screws so that the bracket moves freely.
• Rotate the bracket 180°.
• Align the mounting holes and reinstall the cover screws making sure the seal gland is
vented to the suction side of the pump.
• If outfitted with an internal relief valve (models C2FV, C2FAV, C2EV, C2ENV, C2GV,
and C2BV), the rotation cannot be changed in the field unless the cover/valve assembly
is also replaced.
Model CK1B
Seal Replacement:
• Remove the cover, idler assembly and cover gaskets.
• Place the pump, cover side down, on blocks set wide enough apart so that the rotor will
clear when pressed out.
• Remove the screws from the bearing housing and pull it off. The inner bearing sleeve
will remain pressed onto the rotor shaft.
• Press out the rotor from the shaft end. The inner bearing sleeve will pop off.
• Remove the seal from the rotor shaft.
• Remove the housing plug.
• Remove the stationary seat from the bearing housing.
• Inspect the rotor for scratches, burrs or gouges. Removal of the inner bearing sleeve will
frequently score the rotor shaft, necessitating replacement of the rotor.
• Inspect all internal parts for wear or damage. Replace any parts as needed.
• To reassemble the pump, first slide the washer and ball bearing over the rotor shaft.
• Replace the shims in the housing, using the same thickness as before.
• This step is extremely important. Insert the rotor with the washer and ball bearing into
the housing. The shims should allow enough clearance so that the rotor will turn freely.
The face of the housing should be even with the ends of the rotor teeth when gently
pressed. If there is not enough clearance the rotor will not turn freely, causing severe
scoring. There cannot be any metal-to-metal contact between the rotor and the housing.
• Replace the cover gaskets, idler assembly and cover.
• Lay the pump on the cover end. Replace the washer over the ball bearing on the rotor
shaft.
• Apply a dab of petroleum jelly over the rotor shaft. (If the seal is EPR, apply a siliconbased lubricant).
• Slide the replacement mechanical seal over the shaft and down until it seats against the
retaining ring.
• With the smooth face up, press the stationary seat into the bearing housing.
• Install the new lip seal into the housing plug.
• Slide the housing plug assembly over the shaft and press it into place.
• Replace the inner sleeve from the roller bearing. Press over the rotor shaft until it is flush
with the seal on the housing plug.
• Replace the bearing housing (still containing the roller bearing) on the rotor shaft.
• Test the pump by turning by hand. Use a small wrench on the shaft over the flat. The
pump will turn with some drag from seal tension, but there should be no binding or high
spots.
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Changing Rotation:
Looking at the pump from the shaft end with the ports up, locate the short vent plug
(painted red). This is the suction (inlet) side of the pump. If on the right, rotation is clockwise; if
on the left, counterclockwise. On the opposite side is a long vent plug. Remove both plugs and
interchange locations.
Location of short vent plug
for counter-clockwise
rotation.
Location of short
vent plug for
clockwise rotation.
Clockwise
Rotation
shown
Top View
If outfitted with an internal relief valve (model CK1BV), the rotation cannot be changed in the
field unless the cover/valve assembly is also replaced.
To change the location of the suction port on pumps supplied with Tuthill's unique automatic
reversing feature (model RCK1B), the following must be done in addition to the steps above:
• Remove the cover screws.
• Rotate the cover 180° so that the boss on the cover points to the new suction (inlet) port.
• Align the mounting holes and reinstall the cover screws.
Model CC
Disassembly and Seal Replacement:
• Remove the internal relief valve and gasket assembly (if so equipped) by loosening the
four screws holding it to the pump housing.
• Disconnect the pump from the motor by removing the four screws holding them
together. Using three of these screws as jackscrews in the threaded holes provided on
the pump flange, pull the pump from the motor. Save the key from the motor shaft.
• Mark the position of the cover in relation to the housing.
• Remove the cover screws, cover and idler.
• Remove the rotor by pressing on the hollow drive shaft with an arbor of approximately
1.375" (35 mm). With model CC009 pumps, the mechanical seal will remain in the
housing. With model CC015, CC020 and CC030 pumps, the rotating element of the seal
will come out with the rotor.
• For model CC009, remove the retaining ring in the bore of the motor mounting and the
mechanical seal.
• For models CC015, CC020 and CC030, remove the seal spring and rotating member
from the rotor and the seal seat from the housing.
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Inspection:
• Check the pump housing, rotor, idler gear, idler pin and cover for wear and chipped or
broken teeth. There must not be any deep scratches or grooves on the following:
ID surface of the housing
OD of the rotor
End face of the rotor
OD of the idler
Either face of the idler
Inside surfaces of the cover, including the crescent.
• Replace worn parts as needed.
Assembly of Pump:
• Place the idler onto the cover assembly.
• Position the gaskets on the cover.
Note: Gaskets are supplied with each pump so that proper internal end clearances are
maintained. The typical end clearance for CC model pumps is .003" to .005".
When pumping thinner viscosity fluids or a drop-off in capacity has occurred because of
excessive endplay of the rotor, removal of one or more of the cover gaskets may moderately
improve performance.
• Install the mechanical seal. For model CC009, insert the spring, rotating member and
seal seat into the seal bore cavity. Reinstall the retaining ring. For models CC015,
CC020 and CC030, place the spring and rotating member on the rotor and insert the
seal seat into the housing bore. A light lubricant will aid this procedure.
• Install the rotor. It should go in without much force.
• Replace the cover/idler/gasket assembly. Align the matching marks for proper location.
• Install the cover screws. Tighten gradually, alternating from a screw on one side to a
screw on the opposite side.
• Install the relief valve and gasket assembly, making sure the adjusting screw points to
the suction side of the pump.
• Check the end clearance.
• Reconnect the pump to the motor, making sure the key has been installed on the motor
shaft and the four screws are securely fastened.
Changing Rotation
Model CC pumps are bi-directional and will work equally well in either direction of
rotation with no modification.
If outfitted with an internal relief valve (model CCV), these pumps become rotational. To
change rotation:
• Remove the four screws holding the relief valve and gasket assembly to the housing.
• Rotate the relief valve and gasket assembly 180° so that the adjusting screw points to
the new suction side of the pump.
• Replace the four screws.
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WARNING
Failure to follow these instructions could result in serious bodily injury or death.
Do not attempt to work on any Tuthill pump installation before completing the steps below.
Disconnect the drive so that it cannot be started while work is being performed.
Review the Material Safety Data Sheet (MSDS) applicable to the liquid being pumped to
determine its characteristics and the precautions necessary to ensure safe handling.
Vent all pressure within the pump through the suction or discharge lines.
All Tuthill pump contain residual 200 SSU lube oil from the factory production test. Determine if
this is compatible with the fluid you are pumping. If the fluid is incompatible, consult the factory.
WARNING
Service - All Models Except CC
Disassembly of Pump:
The seal or packing must be removed before the pump can be disassembled.
• Mark the cover, housing and bracket for proper re-assembly.
• Remove the cover screws, cover, housing, idler and rotor from the bracket.
Inspection:
• Check the pump housing, rotor, idler gear, idler pin and cover for wear and chipped or
broken teeth. There must not be any deep scratches or grooves on the following:
ID surface of the housing
OD of the rotor
End face of the rotor
OD of the idler
Either face of the idler
Inside surfaces of the cover, including the crescent.
• Replace worn parts as needed.
• The rotor should be positioned in the housing or bracket and checked for clearance in
the bearing. The shaft must turn freely without any detectable side play. Any side play
will require replacement of the housing, bracket, rotor or all three parts.
Assembly of Pump
• Clean all parts thoroughly using great care to eliminate all dirt.
• Install the rotor in the pump bracket.
• Position the O-Rings in the O-Ring groove of the bracket and housing.
• Install the housing over the rotor head positioned on the bracket register.
• Place the idler gear on the pin in the cover assembly and position in the housing
register.
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• Align the matching marks for proper location.
• Install the cover screws. Tighten gradually, alternating from a screw on one side to a
screw on the opposite side.
• Install the packing or seal, following the instructions for the specific model in question.
Troubleshooting
No fluid is delivered:
• Power is not on.
• Net positive suction head available (NPSHA) is lower than required for the inlet
conditions and the vapor pressure of the liquid pumped. Calculate NPSHA and redesign
piping if necessary.
• Leaks in suction line or port passages. These can be detected by submerging the
pressure line from the discharge side of the pump into a pail of liquid where the air will
be seen in the form of bubbles.
• Direction of shaft rotation is incorrect.
• Pump shaft is not rotating. The coupling is defective or the tongue and groove are not
engaged.
• The relief valve setting is too low. Liquid is discharging through the by-pass port.
Capacity is too low:
• There are leaks in the suction line.
• Suction losses are too high. The suction lift is too great or the suction line too small or
too long. This can be detected by installing a vacuum gauge directly at the pump
suction. The maximum vacuum at the pump suction should never exceed 15" of
mercury. Vaporization caused by higher vacuums will generally result in capacity dropoff. Suction conditions must be redesigned.
• Pump speed is too slow.
• The strainer is too small or obstructed.
• The suction port or pipe is not immersed deeply enough in the liquid.
• Piping is improperly installed, permitting an air pocket to form in the pump.
Pump works spasmodically:
• Leaky suction line.
• Varying suction conditions.
• Air or vapor in the fluid.
Excessive power draw:
• Pressure too high.
• Liquid is more viscous than originally expected.
• Suction or discharge lines obstructed.
• Insufficient horsepower.
• Drive shaft and pump misaligned.
• Pump binding due to insufficient end clearance.
• Pump shaft is bent.
• Misalignment within the pump due to bad piping or poor installation, causing strain or
distortion.
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Pump is noisy:
• Pump is cavitating due to inadequate suction conditions.
• Misalignment of coupling.
• Coupling is set too close to pump.
• Vibration of pump due to worn or bent shaft.
• Air leaks on suction side of pump or air entrainment in the fluid.
Pump leaks:
• Cover bolts need tightening or o-rings are defective.
• Worn or defective seal.
Material Returns
If it becomes necessary to return a pump to the factory, a Return Goods Authorization
(RGA) must be obtained from either your local Authorized Distributor or our Chicago plant. No
RGA can be issued until a completed Material Safety Data Sheet (MSDS) has been forwarded
to our Chicago plant and return of the pump approved.
• Tuthill pumps are precision built and must be handled with care.
• Pumps must be drained of all fluid and the ports plugged to prevent foreign material from
getting into the pump.
• Pumps must be packaged securely to prevent damage while in transit.
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