Tuthill AC Quick guide

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Tuthill Pump Group
12500 South Pulaski Road
Alsip, IL 60803
USA
o708.389.2500
f708.388.0869
Service Instruction No. 22
Rev. 3 04/08
INSTALLATION AND SERVICE
INSTRUCTIONS
C SERIES PUMPS

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General Description
Model AC
Model AC pumps are available in six sizes, ranging in capacity from 2 to 84 gpm with
differential pressures to 100 psi. The maximum discharge pressure capability is 125 psi.
They have an integrally cast mounting foot and are supplied in four different mounting
styles. This pump is suitable for driving at direct motor speeds and will pump equally well
in either direction of rotation (unless supplied with an internal relief valve). It is equipped
with a sleeve bushing, aluminum packing and an adjustable packing gland.
Model C1G
Model C1G is similar to model AC except that it is equipped with spring loaded V type
leather packing. Model C1G 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 C1G is available in six sizes, ranging in capacity from 2 to 84 gpm with
differential pressures to 100 psi. The maximum discharge pressure capability is 125 psi.
Like the model AC, these pumps are available in four different mounting styles.
Models C1E, C1EN, CIF and C1FA
Model C1E and C1F pumps are sleeve bushing lip seal units designed for direct drive
service. Model C1E has an integral foot mount. Model C1F is a flange mount pump. Model
C1FA pumps are similar to model C1F but are supplied without a seal. Model C1EN
pumps are sleeve and ball bearing units with a lip seal and integral 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 C1B
Model C1B is a flange mount pump with two sleeve type bushings and a mechanical seal.
It is bi-rotational, unless equipped with an internal relief valve. 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 CKIB
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.

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Model CC
Model CC pumps are designed to mount directly to NEMA 56 143 TC or 145 TC 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 and can handle
inlet pressures to 25 psi and differential pressures to 100 psi.
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 crescent-shaped 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.

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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.
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.

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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.
Model AC, C1B and CC pumps can be driven in either direction of rotation, unless
outfitted with an internal relief valve. All other C Series pumps are directional. 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.
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.

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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, bushings and/or
metal parts.
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.

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•Open suction and discharge gate valves.
•Check for any leaks once gate valves are open. After completing these checks
the pump can be started.
CAUTION!
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.
Pump Performance Data
Size Capacity (gpm)
CC009 9
CC015 15
CC020 20
CC030 30
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.
Size
1C
2C
3C
4C
5C
6C
Capacity (gpm)
3
8
17
36
61
84

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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 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.
Service - Specific Models
Model AC
Lubrication
Model AC 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 #930 AAA, 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 opposite side of the housing in a vise
with the shaft end up.
•Remove the lock wire and packing gland screws.
•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.
•Slide the packing gland off the shaft.
•Remove the old packing from the bracket.
•Inspect the shaft. If the shaft is too badly worn or scored at the packing area,
the rotor must be replaced.

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•Position the new packing over the shaft and slide into the bracket.
•Install the packing gland and the screws. Take care when tightening up the
packing gland screws so as not to cause undue pressure in the stuffing box.
Pull up firmly on the packing gland screws, back off to finger tight and lock the
screws in place with the lock wire.
Aluminum packing is the standard in models 1AC through 6AC.Following is a table of packing
sizes:
Size ID OD Length
1 1/2" 55/64" 5/8"
2 5/8" 59/64" 3/4"
3 & 4 3/4" 1 1/8" 3/4"
5 & 6 1" 1 1/2" 1 1/2"
Changing Rotation
Model AC pumps in sizes 1 through 6 are bi-directional and will work equally well in
either direction of rotation with no modification.
If outfitted with an internal relief valve (model ACV), these pumps become rotational.
Rotation cannot be changed in the field unless the cover/valve assembly is replaced.
To change the location of the suction port on pumps supplied with Tuthill's unique
automatic reversing feature (model RAC):
• 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 C1G
Lubrication
Model C1G 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 #930 AAA, 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.