Tuthill M-D Pneumatics 9000 Series User manual

Tuthill
Mechanical Vacuum Boosters
Mechanical Vacuum Boosters
Models
9012 9027
9016 9036
9020
31/35/90/92 Series - Vertical Flow
33/37/91/93 Series - Horizontal Flow
OPERATOR’S MANUAL
Manual 2001 Rev B p/n 2001
WARNING: Do Not Operate Before Reading Manual
Operator’s Manual: Tuthill Mechanical Vacuum Boosters
Copyright © 2020 Tuthill Springeld
All rights reserved. Product information and specications subject to change.
Tuthill Springeld | tuthillvacuumblower.com | 800.825.6937

2
TABLE OF CONTENTS
SECTION PAGE
1. INTRODUCTION 3
1.1 APPLICABLE DOCUMENTATION 3
1.2 SCOPE OF MANUAL 3
2. CONVENTIONS AND DATA PLATE 3
2.1 GRAPHIC CONVENTIONS IN MANUAL 3
2.2 DATA PLATE 4
3. LIFTING 5
4. DESCRIPTION 5
4.1 FLOW DIRECTION BY ROTATION 6
4.2 SPECIFICATIONS 6
5. INSTALLATION 7
5.1 GENERAL 7
5.1.1 LOCATION 9
5.1.2 FOUNDATION 9
5.1.3 BOOSTER AIR INTAKE 9
5.1.4 SOFT FOOT 10
5.2 SAFETY 10
5.3 LUBRICATION 11
5.3.1 FILLING PROCEDURE 12
5.3.2 FREQUENTLY ASKED QUESTIONS REGARDING LUBRICATION 12
5.3.3 HAZARDS ASSOCIATED WITH BREAKDOWN OR IGNITION OF LUBRICATION 13
5.3.4 LUBRICATION – INTEGRAL PRESSURE (31, 33, 35, 37 SERIES) 13
5.3.5 OIL FILTER 13
5.3.6 OIL PRESSURE ADJUSTMENT 13
5.3.7 OIL COOLER 14
5.4 PIPING CONNECTIONS 14
5.4.1 BLOCKAGE OR RESTRICTION 14
5.5 MOTOR DRIVES 15
5.5.1 DIRECT COUPLED 15
5.5.2 V-BELTS 15
5.5.3 V-BELT TROUBLESHOOTING 17
5.6 MOTOR AND ELECTRICAL CONNECTIONS 17
6. OPERATION 18
6.1 GENERAL 18
6.2 START-UP CHECKLIST 19
6.3 STARTING 19
6.4 OPERATING 19
6.5 STOPPING 20
6.6 WATER INJECTED VACUUM BOOSTERS 20
6.6.1 OPERATION 20
6.6.2 SHUTDOWN 21
6.7 RECOMMENDED SHUTDOWN PROCEDURE TO MINIMIZE RISK OF FREEZING OR CORROSION 21
7. MAINTENANCE 22
7.1 GENERAL 22
7.2 REGULAR MAINTENANCE 22
7.3 SPARE PARTS 23
7.4 FACTORY SERVICE & REPAIR 23
7.5 LONG TERM STORAGE 24
8. DISASSEMBLY AND ASSEMBLY 25
8.1 DISASSEMBLY 25
8.1.1 FREE END DISASSEMBLY 25
8.1.2 GEAR END DISASSEMBLY 25
8.1.3 END PLATE AND ROTOR DISASSEMBLY 26
8.2 ASSEMBLY 26
8.2.1 PREPARATION OF END PLATES 26
8.2.2 GEAR END ASSEMBLY 26
8.2.3 FREE END ASSEMBLY 27
8.2.4 ADJUSTING INTERLOBE CLEARANCE 28
8.2.5 COMPLETE DRIVE END ASSEMBLY 28
9. TROUBLESHOOTING 30
10. ASSEMBLY CLEARANCES 31
11. TORQUE CHART 31
12. RECOMMENDED LUBRICANTS 32
13. SPECIAL TOOL DRAWINGS 34
14. PARTS LISTS AND ASSEMBLY DRAWINGS 35
16. WARRANTY — BLOWER PRODUCTS 42
17. OPERATING DATA FORM / PRODUCT REGISTRATION 43

3
1. INTRODUCTION
CONGRATULATIONS on your purchase of a new Mechanical Vacuum Booster from Tuthill Springeld.
Please examine the booster for shipping damage, and if any damage is found, report it immediately to the
carrier. If the booster is to be installed at a later date make sure it is stored in a clean, dry location and
rotated regularly. Make sure covers are kept on all openings. If booster is stored outdoors be sure to protect
it from weather and corrosion.
This manual covers the installation, operation and maintenance of 9000 Series mechanical vacuum
boosters. The boosters are manufactured for either a vertical ow or a horizontal ow. Most in-eld drive
conversions can be readily accomplished by changing the location of a few external parts.
Mechanical Vacuum Boosters are built to exacting standards and if properly installed and maintained
will provide many years of reliable service. We urge you to take time to read and follow every step of these
instructions when installing and maintaining your booster. We have tried to make these instructions as
straightforward as possible. We realize getting any new piece of equipment up and running in as little time
as possible is imperative to production.
NOTE
Record the blower model and serial numbers of your machine in the
OPERATING DATA form on the inside back cover of this manual. You will
save time and expense by including this reference identication on any
replacement part orders, or if you require service or application assistance.
1.1 APPLICABLE DOCUMENTATION
The applicable documents associated with this manual are:
• 2006/42/CE – Machinery Directive
• EN 1012-2:1996 - Compressors and vacuum pumps - Safety Requirements - Part 2: Vacuum Pumps
1.2 SCOPE OF MANUAL
The scope of this manual and the Declaration of Incorporation includes the bare shaft mechanical vacuum
booster.
2. CONVENTIONS AND DATA PLATE
2.1 GRAPHIC CONVENTIONS IN MANUAL
This manual is the result of a risk assessment according the applicable documents referenced in section
1.1. The following are hazard levels are referenced within this manual:
DANGER
Indicates an immediate hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING
Indicates that a physical injury or damage to health or property, if not
avoided, could occur.
CAUTION
Indicates that a potential hazard may occur which, if not avoided, could
result in minor or moderate injury.

4
NOTE
Indicates a statement of information which, if not avoided, could cause
damage to the product.
CAUTION
Read manual before operation or bodily harm may result. Attention should
be given to the safety related sections of this manual.
2.2 DATA PLATE
WARNINGWARNING CAUTION CAUTION
http://www.tuthill.com
Hearing protection
re
q
uired.
Do not touch hot
surfaces.
ASUehtniedaM7396-528)008(
READ INSTRUCTION MANUAL BEFORE OPERATION OR BODILY HARM MAY RESULT
Keep body & clothing away
from machine openings.
Do not operate without
g
uards in
p
lace.
REBMUNLAIRESREBMUNLEDOM
Tuthill Vacuum & Blower Systems
4840 West Kearney Street
Springfield, Missouri USA 65803
YEARMAWP
MAX RPM
General Operation and Symbols on Data Plate - The following information is contained on the data plate:
WARNING
Keep body & clothing away from machine.
During operation, keep body and clothing away from inlet and outlet of the
booster.
WARNING
Do not operate without guards in place.
CAUTION
Hearing protection is required while the booster is in operation. Noise
levels may reach as high as 81 dBA.
CAUTION
Do not touch hot surfaces.
The upper limit of the booster operation is 375° F (190° C). Do not touch
the booster while it is in operation and assure booster is cool when not in
operation.
MODEL NUMBER: This identies the specic model of the booster.
SERIAL NUMBER: Each booster has a unique serial number. This number is to be used with any
service issues and with any contact with the manufacturer.
YEAR: This states the year that the booster was manufactured.
RPM: This states the maximum RPM that the booster can be operated.

5
3. LIFTING
WARNING
The booster must be handled using an appropriate device such as a fork
truck or appropriate lifting device. See Table 1 for approximate weights.
Care should be taken to assure booster does not over-turn during handling
and installation.
4. DESCRIPTION
NOTE
Refer to specic data sheets for ow capacities and vacuum capacities.
NOTE
Refer to diagrams in this manual for proper rotation and orientation in inlet
and discharge.
Tuthill Springeld model 9000 mechanical vacuum boosters are positive displacement type units, whose
pumping capacity is determined by size, operating speed, and differential pressure conditions. Vacuum
boosters employ rotors rotating in opposite directions within a housing closed at the ends by end plates.
Effective sealing of the inlet to the discharge is accomplished through the use of very small operating
clearances. The resulting absence of moving contact eliminates the need for any internal lubrication.
Clearances between the rotors during rotation are maintained by a pair of accurately machined helical
timing gears, mounted on the two shafts extended outside the air chamber. The intermeshing rotary lobes
are designed to rotate and trap air or gas between each rotor and the housing. As the rotor lobes rotate
past the edge of the suction port, the trapped air or gas is essentially at suction pressure and temperature.
Since the booster is a constant volume device, the trapped air remains at suction pressure until the leading
rotor lobe opens into the discharge port. The close clearances between the rotors inhibit back slippage of
the trapped volume from between the rotors and the trapped volume is forced into the discharge piping.
Compression occurs not internal to the booster, but by the amount of restriction, either downstream of the
booster discharge port, or upstream of the booster inlet port.
Figure 1 illustrates that the air moves not between the rotors but between the rotors and the side of the
housing. Also, the machine is bi-directional, meaning that the direction of rotation of the booster can make
either side the inlet or discharge. See also the Flow Direction by Rotation section on page 6.
No attempt should ever be made
to control capacity by means
of a throttle valve in the intake
or discharge piping. This will
increase the power load on the
drive system, increase operating
temperatures, and can overload
and/or seriously damage the
booster. Likewise, if a possibility
exists that ow to the booster
inlet may be cut off during normal
operation of a process, then an
adequate vacuum relief valve
must be installed near the booster.
A pressure type relief valve in the Figure 1 - Illustration of general operation principle
INLET INLET INLET
DISCHARGE DISCHARGE DISCHARGE

6
discharge line near the booster is also strongly recommended for protection against cutoff or blocking in
this line. Check valves should also be used on every booster when more than one booster is connected to
a discharge line. This is for both safety and operating conditions.
Vacuum boosters must be protected by cut-in switches or with bypass valving to limit differential pressure
across the booster.
When a belt drive is employed, booster speed, if necessary, can usually be adjusted to obtain desired
capacity by changing the diameter of one or both sheaves, or by using a vari-speed motor pulley. In a
direct coupled arrangement, a variable speed motor or transmission is required, or excess air or gas may
be blown off through a manually controlled unloading valve and silencer. Gas units can use bypasses, but
some applications may require additional cooling. If there is a large volume of high pressure air or gas
downstream of the booster, a check valve in the piping downstream of the booster will protect the booster
from overspeeding in a backward direction upon shutdown.
Consult your Tuthill Springeld sales professional if questions arise.
4.1 FLOW DIRECTION BY ROTATION
INTAKE
INTAKE
DISCHARGE INTAKE
DISCHARGE
DISCHARGE
INTAKE DISCHARGE
INTAKE
DISCHARGE
RIGHT DRIVE
CW ROTATION
LEFT DRIVE
CW ROTATION
LEFT DRIVE
CCW ROTATION
RIGHT DRIVE
CCW ROTATION
TOP DRIVE
CW ROTATION
TOP DRIVE
CCW ROTATION
BOTTOM DRIVE
CW ROTATION
BOTTOM DRIVE
CCW ROTATION
DISCHARGEINTAKE INTAKE
INTAKEDISCHARGE DISCHARGE
Figure 2 - Flow Direction by Rotation
4.2 SPECIFICATIONS
TABLE 1 — SPECIFICATIONS
MODEL
APPROXIMATE OIL CAPACITY
GALLONS / LITERS PORT
SIZE
IN / MM
MAX
RPM
APPROXIMATE WEIGHT
LBS. / KG
VERTICAL FLOW HORIZONTAL FLOW
VERTICAL FLOW
90 / 92 / 92 / 93
HORIZONTAL FLOW
31 / 33 / 33 / 37
9012
7.9 / 30* 4.8 / 18*
10 / 250
2400
1610 / 730 1630 / 740
9016 12 / 300 1730 / 785 1750 / 795
9020 12 / 300 1980 / 900 2000 / 910
9027 14 / 350 2210 / 1000 2230 / 1010
9036 16 / 400 2510 / 1140 2530 / 1150
Maximum discharge temperature is 375°F (190°C). Maximum temperature is based on a 70°F (21°C) inlet temperature. For inlet
temperatures below 70°F (21°C), maximum allowable temperature rise across the vacuum booster should also never exceed
305° F (169°C).
* Integral Lube units require up to 2 additional gallons. To permit continued satisfactory performance, a
vacuum booster must be operated within certain approved limiting conditions. The manufacturer’s warranty
is, of course, also contingent on such operation. Maximum limits for pressure, temperature and speed are
specified here for various booster sizes when operated under the standard atmospheric conditions. Do not
exceed any one of these limits.

7
EXAMPLE: Seldom does the operation of a vacuum booster result in pressure differentials large enough
to strain the booster drive train (bearings, gears and seals). Typically in vacuum boosting, the maximum
allowable temperature limit (the limit is a function of the temperature rise as well as the inlet temperature)
for any particular booster may occur well before the maximum speed or allowable power rating is reached.
Temperature rise then becomes the limiting condition. In other words, the operating limit is always to be
determined by the maximum rating reached first, and it can be any one of the three: temperature, speed,
or horsepower.
NOTE
Specially ordered blowers with nonstandard construction, or with rotor end
clearances greater than shown within the Assembly Clearances table, will
not have the operating limits specied here. Contact your Tuthill Springeld
sales representative for specic information.
NOTE
Special attention must be paid when a vacuum booster has a higher than
standard ambient suction temperature. Special recommendations for
operating parameters and/or additional cooling may be recommended.
Consult the factory or local representative for appropriate information.
Deep vacuum requires instrumentation much more sensitive than standard thermometers and mercury
type pressure or vacuum gauges. At operation pressures less than 100 Torr (mmHg), low-deadband cut-in
switches and low-mass thermocouples should be utilized and positioned such that the sensor is connected
to the inlet and discharge connections of the vacuum booster. NPT connections are provided at each of the
inlet and discharge ports for this purpose. Standard temperature switches, because of their higher mass, do
not have reaction times fast enough to adequately protect the vacuum booster. Likewise, standard vacuum
switches are not recommended for cut-in switches as vacuum boosting typically requires a very accurate
cut-in point. A tachometer will enable periodic checks of operating speed.
NOTE
Maximum discharge temperature is 375° F (190° C). Maximum temperature
is based on a 70° F (21° C) inlet temperature. For inlet temperatures below
70° F (21° C), maximum allowable temperature rise across the vacuum
booster should also never exceed 305° F (169° C).
NOTE
Do not exceed maximum RPM or discharge temperature as stated above
5. INSTALLATION
5.1 GENERAL
DANGER
The booster is not intended to be used with explosive products or in
explosive environments.
DANGER
It is the responsibility of the installer to assure that proper guarding is in
place and compliant with all applicable regulatory requirements.

8
WARNING
The bare shaft booster can generate excessive noise. Methods to reduce
the noise levels by installing inlet and outlet silencers will be required. Even
with inlet and outlet silencers, hearing protection will be required.
WARNING
Customers are warned to provide adequate protection, warning and safety
equipment necessary to protect personnel against hazards in the installation
and operation of this equipment in the system or facility.
WARNING
Table 1 states the maximum operating speed in RPM (rotations per minute)
and maximum temperature. Do not exceed these limits. The installation of
the booster shall take these critical operating parameters into account and
adequate control features implemented.
WARNING
Upon completion of the installation, and before applying power, rotate the
drive shaft by hand. It must move freely. If it does not, look for uneven
mounting, piping strain, excessive belt tension or coupling misalignment or
any other cause of binding. If booster is removed and still does not move
freely, check inside the booster housing for foreign material.
NOTE
Remove the protective covers from the shaft and inspect for damage.
Carefully check to ensure that no transit damage has been sustained. If damage has occurred from
shipment a claim must be led with the carrier immediately; preserve the shipping container for inspection
by the carrier.
NOTE
In the event that your unit sustains damage while being shipped to your
facility, do not return it to the factory without rst obtaining shipping
instructions from us.
Protective covers and plugs should not be removed until the connection is being made. Mount the booster
on a at, level surface. We recommend a baseplate that is a rigid, solidly supported, and structurally
sound. Shim under the legs where necessary so that each leg of the booster supports an equal share of the
booster weight. This is necessary to prevent eventual twisting of the booster. Make sure feet rest evenly on
the mounting surface before fastening down. Twisting or cramping the booster in mounting will cause rotor
contact and binding during operation, resulting in a condition called “soft foot”. (See the Soft Foot section
of this manual for further details and preventative measures.)
A unit that is factory mounted on a base, should not require the above adjustments. However, since
the assembly can become twisted in shipping or installation, checking for soft foot should be done after
installation of the base. Shims may be needed for alignment. Loosen the foot hold-down screws to check
foot contact with the mounting surface. The base should be mounted on a solid foundation or heavy ooring,
using shims as necessary at bolting points to prevent warping the assembly. (Also refer to the Foundation
section.)
Transmission of small operating vibrations to a support structure may be objectionable in some cases. Use
of vibration isolators or vibration absorbing materials can be effective in overcoming this problem. To avoid
casing distortion, the treatment used should be applied under the common motor/booster base or mounting
plate, rather than directly under the feet alone.

9
Piping should be accurately squared with the booster and supported independently. Stress imparted from
incorrectly aligned piping or mounting will create problems with bearing and seal life, possibly leading to
premature internal contact. The booster should sit stress free and evenly on its supporting surface. Care
should be taken to evenly tighten the mounting bolts to not impart undue stress into the booster. Stress can
be checked in a free state with feeler stock or veried on a previously installed blower with the aid of a dial
indicator. Less than .002” (.05 mm) spring or gap should be found.
A booster may be driven by direct-coupling to the driver or by V-belt drive, to obtain other speeds within
approved range. (See the Motor Drives section for more information.)
Boosters from Tuthill Springeld are internally and externally treated after factory assembly and testing
to protect against rusting in normal atmospheric conditions prior to installation. The maximum period of
internal protection is considered to be up to 6 months under average conditions, provided closing plugs
and seals are not removed. Protection against chemical or salt water atmosphere is not provided. Avoid
opening the booster until ready to begin installation, as protection will be quickly lost due to evaporation.
(For recommended preparations for long term storage (longer than 6 months), please see the Long Term
Storage section in this manual.)
5.1.1 LOCATION
Install your booster in a room or outdoor area that supplies adequate space and lighting for routine
maintenance. Indoor installation areas should be well ventilated and kept as cool as possible, because
operating the unit at elevated temperatures can result in nuisance overload or temperature shutdowns. An
unprotected outdoor installation is only satisfactory when correct lubrication for expected temperatures is
provided, as per the Recommended Lubricants section in this manual.
5.1.2 FOUNDATION
Your booster does not need a special foundation, however it does require a solid, level oor and adequate
frame support. Bolt the booster to the oor and seal any cracks.
5.1.3 BOOSTER AIR INTAKE
To minimize maintenance, supply your booster with the cleanest air possible. It is important that the air
does not contain any ammable or toxic gases, as the booster will concentrate these gases. This could
result in damage to the unit and surrounding property, lead to personal injury or death. Do not block or
restrict the opening or the booster and/or motor may overheat and fail.
Do not use boosters on explosive or hazardous gases. Each size booster has limits on pressure differential,
running speed, and discharge temperature. These limits must not be exceeded. Consult Table 1 for details
pertaining to the allowable performance criteria.
If it is necessary to take air from a remote source, such as in a vacuum application, the piping should be
at least the same diameter of the booster inlet. For distances greater than 20 feet (6 m) the pipe diameter
should be enlarged to reduce inlet restriction. Excessive restriction will reduce the efciency of the booster
and elevate its discharge temperature. The piping used should also be corrosion resistant, and free of
scale and dirt. The inlet should be covered to keep out precipitation, insects, and small animals. Vacuum
kits are available.

10
5.1.4 SOFT FOOT
Soft foot is a condition in which one of the booster feet does not sit
at on the base. Usually, this is due to irregularities in the surface
to which the booster is mounted. When you tighten the bolt on the
foot, the booster will distort slightly, but enough to cause problems
with bearing and seal life, and premature internal contact between
the rotors and the housing.
1. Place booster on base.
2. Check each foot for gaps between foot and base (soft foot),
shim as necessary to ll gap within .002” (.05 mm) Below are
shown the two most common types of soft foot conditions. If
either type is present, and measures more than .003” (.076
mm), the booster may fail prematurely.
3. Tighten all bolts.
4. Mount a dial indicator on base contacting one foot at 12
o’clock position.
5. Loosen bolt on that foot. Observe indicator travel and add
shims as needed to reduce “spring” to less than .002” (.05
mm). Repeat steps 4 and 5 on remaining feet.
5.2 SAFETY
Tuthill Springeld recommends the use of relief valves to protect against excessive pressure or vacuum
conditions. These valves should be tested at initial start-up to be sure they are properly adjusted to relieve
at or below the maximum pressure differential rating of the booster.
DANGER
It is the responsibility of the installer to assure that proper guarding is in
place and compliant with all applicable regulatory requirements.
DANGER
Internal and external rotating parts of the booster and driving equipment
can produce serious physical injuries. The booster should never be run with
the inlet or discharge piping removed. If it becomes necessary to inspect
the rotating parts of the booster or to change V-belts, be absolutely sure
that all power to the motor controls has been shut off, the motor controls are
locked out, and properly tagged before proceeding.
DANGER
Assure that properly sized vacuum breaks/relief valves are used on the inlet
side of the booster. Also assure that properly sized pressure relief valves
are used on the outlet of the booster. The sizing shall be such to assure
that the proper ow can be achieved without exceeding the rated vacuum
and pressure ratings.
DANGER
Blower housing and associated piping or accessories may become hot
enough to cause major skin burns on contact.
Figure 3 - Illustrations of Soft Foot
ANGULAR
SOFT FOOT
PARALLEL
SOFT FOOT

11
WARNING
Use lock out/tag out procedures to disable the electrical energy source
before any service or work is done on the booster.
WARNING
Avoid extended exposure in close proximity to machinery with high intensity
noise levels. Wear adequate ear protection.
NOTE
Use proper care and good procedures in handling, lifting, installing,
operating, and maintaining the equipment.
5.3 LUBRICATION
Every booster from Tuthill Springeld is factory tested; oil drained and shipped dry to its installation point.
Both oil reservoirs must be lled to the proper level before operation. In addition to the splash lubrication,
booster series incorporating pressure lubrication with a integral oil pump, pressure relief valve, lter and
oil-to-coolant heat exchanger. Before starting the booster, ll oil sumps as shown below within the Filling
Procedure section. Tuthill Springeld approved mineral-based, synthetic and food grade lubricants are
listed on page 32.
Select a suitable low vapor pressure lubrication for high vacuum service such as Tuthill Pneulube Synthetic
oil. For higher pressure, 1 torr or more, a good grade of turbine lubricating oil may be used. It should have
a viscosity of approximately ISO 100 @ 100°F (38°C). Also refer to the Recommended Lubricants page
within this manual.
Add vacuum oil to the blower in the quantity shown within the Specications Table. The oil level must be
maintained within the notched area of the sight glass. Lower drive units have “bull’s eye” type oil level
gauges. Maintain oil levels at the center of the glass.
WARNING
Never attempt to change or add lubrication while the booster is running.
Failure to heed this warning could result in damage to the equipment or
personal injury.
WARNING
Properly dispose of the spent lubricants. Refer to the manufacturer of the
lubricant and any regulations to assure proper and safe disposal.
WARNING
Do not start the booster until you are sure oil has been put in the gear
housing and rear cover. Operation of the booster without proper lubrication
will cause the booster to fail and void the warranty.
NOTE
Refer to Table 1 for oil capacities.

12
5.3.1 FILLING PROCEDURE
See Figure 4. Recommended lubricants are shown on page 32.
1. Remove large hex head ll plug from back (non-drive) end cover.
2. SLOWLY pour oil through ll until oil appears in the oil sight glass. Bring oil level to center of sight glass.
3. Verify oil level is at proper level in BOTH gear end and drive end sight glasses.
4. Replace and secure ll plug that was removed in step 1.
The end cover oil reservoirs are connected together internally by passageways cast into the rotor housing.
To change oil, drain from the one-inch square head plug located in bottom of cover, or the on-half inch plug
in the oil pump cover.
Oil levels should be checked frequently. Booster must be shut down to properly check oil level.
SIDE
DRIVE END
NON-DRIVE END
OIL
COOLER
3/4 NPT
COOLING
WATER
CONNECTIONS
(INLET OR OUTLET
CAN BE EITHER PORT)
1 NPT OIL
TEMPERATURE
CONNECTION
1/2 NPT
OIL
PRESSURE
CONNECTION
MAGNETIC
DRAIN
PLUG
OIL PRESSURE
GAUGE
OIL
LEVEL
SIGHT
GAUGE
RELIEF
VALVE
OIL FILTER
OIL
FILL
PLUG
MAGNETIC
DRAIN PLUG
COOLING
WATER
INLET
3/8 NPT
COOLING
WATER
OUTLET
3/8 NPT
Figure 4 - Location of oil fill, drain plugs, level gauges and cooling connections
5.3.2 FREQUENTLY ASKED QUESTIONS REGARDING LUBRICATION
What is the functional detriment if the “wrong oil” is used?
The lubricant is selected based on bearing and gear speed, and operating temperature. Too light
of a lubricant increases wear by not separating the sliding surfaces and it will not remove the heat
adequately. If the lubricant is too thick, the drag in the bearings is increased causing them to run hotter.
Since it is thicker, it will not ow as readily into the gears and it will reduce the available backlash.
Lubricants at our conditions are incompressible.
What is the functional detriment if the oil is not serviced?
If the lubricant is not serviced at the proper interval the shearing action in the bearing and the gears will
begin to take their toll and the lubricant will thicken, making matters worse. The unit will run hotter and
the wear on running surfaces will increase. Generally, the lubricant will appear dirtier, this is actually
material rubbed off the unit’s components. The discoloration comes from overheating the additive
package. An indicator of the breakdown of a lubricant is the increase in the TAN (Total Acid Number),
and a change in the base viscosity of ten percent.
Several things are happening as the lubricant goes through the unit. First, it is absorbing frictional
energy in the form of heat. This heat has to be dissipated through either surface contact with cooler
materials, or in a rest volume of lubricant. While reducing the friction, the lubricant is also going through
a shearing process and the molecular structure is broken down.
The result is that the lubricant will begin to thicken because of the shorter molecular chains and the drop
out of additive packages. The thickened lubricant will cause more drag, increasing the friction and heat,
and further degrading the lubricant.
Operation of the booster (environment, run time, speed, and pressure) has a direct effect on duty
cycles. Our published cycles are based on worst-case conditions.

13
5.3.3 HAZARDS ASSOCIATED WITH BREAKDOWN OR IGNITION OF LUBRICATION
DANGER
There is a risk associated with the lubrication media breaking down and
resulting in a hazardous uid or vapor. There may also be a hazard
associated with the ignition of the lubrication media. Refer to the lubrication
manufacture’s applicable instruction for safety precautions.
5.3.4 LUBRICATION – INTEGRAL PRESSURE (31, 33, 35, 37 series)
5.3.5 OIL FILTER
The oil lter is a self-contained,
spin-on type. Change the oil lter
element with every oil change.
Filters (see table at right) are
available from Tuthill Vacuum and
Blower Systems in Springeld,
Missouri, or from any authorized
distributor or service center.
CAUTION
Factory supplied lters are engineered to provide the proper restriction in
the oil lubrication system. Using lters other than those available from Tuthill
Springeld may result in lubrication problems and possibly unwarrantable
damage to the booster.
5.3.6 OIL PRESSURE ADJUSTMENT
The oil pressure on each unit has been preset at the factory during
the load testing. Generally the oil pressure should not require
adjustment once the unit is installed and in operation. Some
adjustment may be required due to the speed and oil temperature.
The oil pump itself has no adjustment, however, the oil by-pass
relief valve located in the oil feed line after the oil lter can be used
for the same purpose.
To adjust the unit to the proper oil pressure, remove the hex cap
shown in the image to the right. Loosen the lock nut and turn the
set screw clockwise to increase the pressure or counterclockwise to
decrease the pressure. Tighten lock nut and replace cap before reading oil pressure. Oil pressure may vary
between 5 psig and 30 psig. The unit’s oil system can operate satisfactorily at 1 psig, if necessary, and still
have sufcient ow. Always allow unit to reach operating temperature before adjusting the oil pressure to
the proper range. Set the oil pressure to 15 psig (103 kPa).
NOTE
All boosters have a composite (vacuum/pressure) oil gauge. This gauge
may show negative pressure or vacuum readings due to the evacuation
of the end covers, even though positive oil pressure exists. For example:
if the booster is operating at 29 in. Hg vacuum (assume 29 in. Hg vacuum
in oil chamber) and the pressure gauge is reading 4 in. Hg vacuum, the oil
pressure is actually at 25 in Hg or approximately 12 psi positive pressure.
OIL FILTERS
SERIES 31/33/35/37
The following oil lters are recommended:
FRAM PUROLATOR
PH 13 PER 5
PH 20 PER 26
PH 37 PER 40
Figure 5 - Pressure Relief Valve
REMOVE
HEX CAP
TO ADJUST
OUT
IN

14
5.3.7 OIL COOLER
The supply line to the cooler can be connected to either hole. The uid owing through the heat exchanger
should be sufcient to keep the oil temperature to the optimum operating range of 150-180 °F (65-80 °C).
This temperature will insure proper lubrication of the bearings and seals. 1.5 to 2 GPM (5 to 7.5 L/min) of
60° F (15° C) water is generally sufcient. Actual water usage will depend on the booster operating condition.
WARNING
If the unit is to be located outside or in a building where ambient temperatures
can fall below freezing, then care must be taken to ensure the water or
liquid used for cooling does not freeze and damage the booster. Oil cooler
must be drained of liquid during downtime unless a re-circulating unit using
a glycol mixture has been installed.
5.4 PIPING CONNECTIONS
WARNING
Pipe loading on the booster should be negligible as pipe loading can cause
distortion of the booster. Use proper supports and pipe hangers to assure
that there is no loading.
NOTE
Remove the protective covers from the inlet and outlet ports and inspect for
dirt and foreign material.
Manifolding should be no smaller than the pump connections in order to minimize restrictions to gas ow.
Accurately align the mating anges to the inlet and discharge manifolding to prevent distortion of the booster
housing. Temporarily t a ne wire mesh lter at the suction port if solid particles are likely to be entrained
into the air stream and remove the lter when particles no longer appear. This is especially desirable on
new installations and when manifolds have been welded. The manifolding to and from the booster should
be tted with exible connections to isolate vibrations, absorb expansion and contraction due to thermal
change, and to absorb misalignment differences. If the booster is to be water cooled, connect a clean
supply to the ¼” NPT connection on the seal adapter housing adjacent to the drive shaft. The drain line will
be connected on the bottom of the non-drive end reservoir, see Figure 4 for connection locations. Care
should be taken to not over tighten or loosen the bushing for the cooling coil connection. The bushing
should be held in place as additional tting and plumbing is performed.
HAZARDS ASSOCIATED WITH HAZARDOUS PROCESS FLUIDS
DANGER
It shall be the responsibility of the installer to ensure that piping is adequate,
sealing between pipe joints is adequate for the process uids and proper
process and pressure protection devices are in place. It is also the
responsibility of the installer to assure that process gasses are not vented
in a manner that would be hazardous.
Refer to the manufacturer of the process media to assure that proper safety
precautions are in place.
5.4.1 BLOCKAGE OR RESTRICTION
WARNING
Damage to the booster could occur if there is blockage in the inlet or outlet
ports or piping. Care should be taken when installing the booster to assure
that there are no foreign objects or restrictions in the ports or piping.

15
5.5 MOTOR DRIVES
Two drive connections commonly used are direct drive and V-belt drive.
5.5.1 DIRECT COUPLED
When installing the motor directly to the booster, align shafts to coupling in accordance with the coupling
manufacturer’s instructions. Boosters shipped with motor directly coupled and mounted on a common base
have been aligned prior to shipment and normally no further alignment is necessary. However, alignment
should be checked and adjustments made if necessary prior to starting the unit.
Coupling halves must correctly t the booster and drive shafts so that only light tapping is required to install
each half. The two shafts must be accurately aligned, A direct coupled booster and motor must be aligned
with the two shafts not having more than .005” (.13 mm) T.I.R. (Total Indicator Reading). Face must be
aligned within .002” (.05 mm) .
Proper gap between coupling halves must be established according to coupling manufacturers instructions
with the motor armature. This will minimize the change for end thrust on the booster shaft. All direct coupled
base mounted units must be re-aligned and greased after eld installation.
5.5.2 V-BELTS
If the motor and booster are V-belt connected, the sheaves on both motor and booster shafts, should be as
close to the shaft bearings as possible. Booster Sheave is not more than 1/4” (6.5 mm) from the booster
drive end cover. The drive sheave is as close to the driver bearing as possible. Care should be taken when
installing sheaves on the booster and motor shafts. The face of the should be accurately in line to minimize
belt wear.
Adjust the belt tension to the to the manufactures specications using a belt tension tester. New belts should
be checked for proper tension after 24 hours of run time. When manufacturer data is not available industry
guidelines are 1/64 inch deection for each inch of span at 8 to 10 pounds of force in the center of the belt.
Insufcient tensioning is often indicated by slipping (squealing) at start up. Belt dressing should not be
used on V-belts. Sheaves and V-belts should remain free of oil and grease. Tension should be removed
from belts if the drive is to be inactive for an extended period of time. For more specic information consult
the drive manufacturer. In a v-belt drive, the booster sheave must t its shaft accurately, run true, and be
mounted as close to the bearing housing as possible to minimize bearing loads.
A tight or driving t will force the drive shaft out of its normal position and cause internal damage. A loose
t will result in shaft damage or breaking. The motor sheave must also t correctly and be properly aligned
with the booster sheave.
Adjust motor position on its sliding base so that belt tension is in accordance with drive manufacturer’s
instructions. Avoid excessive belt tension at all times. Recheck tension after the rst ten hours of operation
and periodically thereafter to avoid slippage and loss of booster speed.
Check booster after installation and before applying power by rotating the drive shaft by hand. If it does
not rotate freely, look for uneven mounting, piping strain, excessive belt tension, or coupling misalignment.
Check booster at this time to insure oil was added to the reservoirs.

16
SETTING V-BELT TENSION
Proper belt tension is essential to long booster
life. The following diagrams and procedures
are provided to aid in eld adjusting V-belts
(when booster is so equipped) for maximum
performance. A visual inspection of the V-belt
drive should yield the appearance shown in
Figure 6.
Factors outside the control of the belt tensioning
system used on an individual booster package
assembly may contribute to decreased belt life,
such as environmental factors, and quality of the
belts installed. This can cause wear of the belts
beyond the ability of the tensioning system to
compensate.
As such, it is recommended to check belt tension
monthly and make any manual adjustments
found necessary.
1. Turn off and lock out power.
2. Remove the fasteners from the belt guard (if
equipped)
3. Remove the belt guard.
4. Check and adjust the belt tension as necessary. It should be 1/64” deection per inch of span (0.157
mm) deection per centimeter of span) between sheaves, with 8-10 lbs. (3.6-4.5 kg) force applied at
center point of the top section of belt.
5. Install the belt guard, making sure that all drive components are free of contact with the guard.
6. Install belt guard fasteners removed in step 2.
7. Unlock the power and start your booster.
8. Resume normal operation.
Too Tight
Slight Bow Too Loose
20/64” = 5/16” (8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Too Tight
Slight Bow Too Loose
20/64” = 5/16” (8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Figure 6 - General appearance of a V-Belt drive
Figure 7 - Setting of proper tension for a V-Belt drive

17
5.5.3 V-BELT TROUBLESHOOTING
PROBLEM POSSIBLE CAUSES SOLUTION
Belts slip (sidewalls glazed) Not enough tension Replace belts; apply proper tension
Drive squeals
Shock load Apply proper tension
Not enough arc of contact Increase center distance
Heavy starting load Increase belt tension
Belt(s) turned over
Broken cord caused by prying on sheave Replace set of belts and install correctly
Overloaded drive Redesign drive
Impulse loads Apply proper tension
Misalignment of sheave and shaft Realign drive
Worn sheave grooves Replace sheaves
Excessive belt vibration
Check drive design
Check equipment for solid mounting
Consider use of banded belts
Mismatched belts New belts installed with old belts Replace belts in matched sets only
Breakage of belt(s)
Shock loads Apply proper tension; recheck drive
Heavy starting loads Apply proper tension; recheck drive
Use compensator starting
Belt pried over sheaves Replace set of belts correctly
Foreign objects in drives Provide drive guard
Rapid belt wear
Sheave grooves worn Replace sheaves
Sheave diameter too small Redesign drive
Mismatched belts Replace with matched belts
Drive overloaded Redesign drive
Belt slips Increase tension
Sheaves misaligned Align sheaves
Oil or heat condition Eliminate oil. Ventilate drive.
5.6 MOTOR AND ELECTRICAL CONNECTIONS
WARNING
The motor and connections shall be protected to assure that product and
environmental condensation does not come in contact with the electrical
connections.
NOTE
It is the responsibility of the installer to assure that the motor is in compliance
with the latest edition of IEC 60204-1 and all electrical connections
performed per IEC 60204-1, this includes over current protection.
Wire the motor and other electrical devices such as solenoid valves and temperature switch to the proper
voltage and amperage as indicated on the nameplate of each component being wired. Turn the booster by
hand after wiring is completed to determine that there are no obstructions and if the booster turns freely;
then momentarily start the booster to check the direction of rotation. Figure 2 shows direction of air ow in
relation to rotor rotation. The air ow direction can be reversed by reversing the appropriate motor leads.

18
6. OPERATION
6.1 GENERAL
DANGER
The booster is not intended to be used with explosive products or in
explosive environments.
WARNING
Do not operate without guards in place.
WARNING
Maximum operating speed: Table 1 states the maximum operating speed
in RPM (rotations per minute) and maximum temperature. Do not exceed
these limits.
Before starting the booster for the rst time under power, recheck the installation thoroughly to reduce the
likelihood of troubles. Use the following check list as a guide, but also consider any other special conditions
in your installation.
1. Be certain no bolts, rags, or dirt have been left in booster.
2. Be certain that inlet piping is free of debris. If an open outdoor air intake is used, be sure the opening is
clean and protected by an inlet lter. This also applies to indoor use.
3. If installation is not recent, check booster leveling, drive alignment, belt tension, and tightness of all
mounting bolts.
4. Be certain the proper volume of oil is in the oil reservoir chambers.
5. Be certain the driving motor is properly lubricated, and that it is connected through suitable electrical
overload devices.
6. With electrical power off and locked out to prevent accidental starting, rotate booster shaft several times
by hand to make sure booster is rotating freely. Unevenness or tight spots is an indication of a problem
that should be corrected before progressing.
7. Check motor rotation by momentarily pushing the start button and check ow direction of the booster.
Reverse the motor connections if ow is in the wrong direction.
Initial operation should be carried out under “no load” conditions by opening all valves and venting the
discharge to atmosphere, if possible. Then start motor briey, listen for unusual noises, and check that the
booster coasts freely to a stop. If no problem appears, repeat this check, and let the motor run a little longer.
If any questions exist, investigate before proceeding further.
Assuming all tests are satisfactory, the booster will now be ready for continuous full load operation. During
the rst several days, make periodic checks to determine that all conditions remain acceptable and steady.
These checks may be particularly important if the booster is part of a process system where conditions
may vary. At the rst opportunity, stop the booster and clean or remove inlet lter. Also, recheck leveling,
coupling alignment or belt tension, and mountlng bolts for tightness.

19
6.2 START-UP CHECKLIST
We recommend that these startup procedures be followed in sequence and checked off ( ) in the
boxes provided in any of the following cases:
• During initial installation
• After any shutdown period
• After maintenance work has been performed
• After booster has been moved to a new location
DATES CHECKED:
Check the unit for proper lubrication. Proper oil level cannot be over-emphasized.
Refer to the Lubrication section. Please see Recommended Lubricants for information
on acceptable lubricants for your product.
Check V-belt drive for proper belt alignment and tension.
Carefully turn the rotors by hand to be certain they do not bind.
WARNING
Disconnect power. Make certain power is off and locked out before touching
any rotating element of the booster, motor, or drive components.
“Bump” the unit with the motor to check rotation (counter-clockwise [CCW] when
facing shaft) and to be certain it turns freely and smoothly.
Start the unit and operate it for 30 minutes at no load. During this time, feel the
cylinder for hot spots. If minor hot spots occur, refer to the Troubleshooting chart.
Apply the load and observe the operation of the unit for one hour.
If minor malfunctions occur, discontinue operation and refer to the Troubleshooting
chart.
6.3 STARTING
Check the oil for proper level at both ends of the booster. Add or drain oil as necessary to bring the oil to
the correct level. See Figure 4. Too much oil, particularly on the gear end, can result in excessive heat
generation. Too little oil will possibly result in failure of the timing gears, bearings, and mechanical seals.
Start the backing pump. When pressure is reduced sufciently, start booster pump. A pressure switch can
be installed to start the booster at a predetermined pressure. If the booster is water cooled turn on the
cooling water when the booster is started. Adjust the water ow so that the discharge water temperature is
no more than lukewarm (70° to 80° F [21° to 26° C]).
6.4 OPERATING
The upper temperature limit for booster pump operation is 375° F (190° C) measured in the exhaust gas
stream with a low mass thermocouple. When this temperature limit switch is installed, as the temperature
exceeds the predetermined temperature, the booster motor will stop and cannot be restarted until the
temperature drops below the trip setting of the temperature switch.
DANGER
The booster is not intended to be used with explosive products or in
explosive environments.

20
WARNING
Physical harm may occur if human body parts are in contact or exposed to
the process vacuum. Assure that all connections are protected from human
contact.
WARNING
If rated vacuum or pressure levels are exceeded, process uids will migrate
to other parts of the booster and system.
CAUTION
Do not touch hot surfaces.
The upper limit of the booster operation is 375° F (190° C). Do not touch
the booster while it is in operation and assure booster is cool when not in
operation.
CAUTION
Use of a thermowell insulates the thermocouple. Invalid and delayed
readings will result. This can result in ineffective protection devices.
NOTE
The upper limits are not intended for continuous operation. Consult with
factory for detailed information assistance.
6.5 STOPPING
CAUTION
Venting the booster to pressures above cut-in while running can damage
the pump.
Stop the booster by turning off the motor. Isolate the booster from the vacuum system and vent the booster
to atmosphere. Turn off the cooling water if water cooled. Stop the backing pump. Refer to component
instruction manual.
6.6 WATER INJECTED VACUUM BOOSTERS
Water injected into the inlet of a booster operating on vacuum service will cool the booster. The water
absorbs the heat of compression as it passes through the unit along with the air/gas being compressed.
A booster cooled in this manner can operate safely at higher vacuums or higher inlet temperatures than a
normally uncooled unit.
The amount of water required depends on the inlet air/gas temperature, inlet vacuum, water temperature,
and the maximum discharge temperature desired. Check with the factory or sales representative for
additional guidance.
6.6.1 OPERATION
1. Check oil level in sight glass of booster and assure all ttings are tight.
2. Check the water injection system to assure water is available.
3. Operate the booster dry for a few minutes at no load to check correct rotation and smooth operation.
4. Turn water on and adjust ow as recommended for the individual booster. Assure water discharges
freely from the outlet piping.
5. Apply vacuum and observe operation at the desired inlet condition.