Tuthill M-D Pneumatics Qube 400 User manual

M-D Pneumatics™
Rotary Positive Displacement
Air Blower System
Qube™
Models
400
800
1600
OPERATOR’S MANUAL
Manual 2011 0112 ENG
Tuthill Vacuum & Blower Systems tuthillvacuumblower.com 800.825.6937
WARNING: Do Not Operate Before Reading Manual
Operator’s Manual: Tuthill Qube Rotary Positive Displacement Air Blower System

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 THIS MANUAL 3
2.2 DATA PLATE 4
3. DESCRIPTION 5
4. INSTALLATION 6
4.1 UNPACKING AND HANDLING 7
4.2 STORAGE 7
4.3 LOCATION 7
4.3.1 LEVELING 8
4.3.2 FOUNDATION 8
4.4 SAFETY 8
4.5 COOLING AIR INTAKE AND DISCHARGE 8
4.6 MOTOR AND ELECTRICAL CONNECTIONS 9
4.7 PIPING 10
4.8 LUBRICATION 12
4.8.1 OIL FILL INSTRUCTIONS 12
4.8.2 FREQUENTLY ASKED QUESTIONS REGARDING LUBRICATION 13
5. OPERATION 14
5.1 START-UP CHECKLIST 15
5.2 STOPPING 15
5.3 PRESSURE RELIEF VALVE 15
5.4 ACCESSORIES 16
5.4.1 NOISE CONTROL ENCLOSURE 16
5.4.2 INTEGRAL SILENCER/BASE 16
5.4.3 COOLING FAN 16
5.4.4 AIR FILTER RESTRICTION GAUGE 17
5.4.5 DISCHARGE PRESSURE GAUGE 17
5.4.6 CHECK VALVE 17
6. MAINTENANCE 18
6.1 OIL INDICATOR, FILL AND DRAIN 18
6.2 AIR FILTER 18
6.3 V-BELTS 19
6.4 PREVENTATIVE MAINTENANCE 20
6.5 LONG TERM STORAGE 20
7. TROUBLESHOOTING 21
8. RECOMMENDED LUBRICANTS 22
9. PARTS LISTS AND DRAWINGS 24
10. DECLARATION OF CONFORMITY 33
11. WARRANTY — BLOWER PRODUCTS 34
12. OPERATING DATA FORM / PRODUCT REGISTRATION 35

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1. INTRODUCTION
CONGRATULATIONS on your purchase of a new Tuthill Qube™ Rotary Positive Displacement Air
Blower Package from Tuthill Vacuum & Blower Systems. Please examine for shipping damage, and if
any damage is found, report it immediately to the carrier. If the blower is to be installed at a later date make
sure it is stored in a clean, dry location and the blower rotated regularly. Make sure covers are kept on all
openings. If blower is stored outdoors be sure to protect it from weather and corrosion.
Qube blower systems 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 system. We have tried to make these instructions as straightforward
as possible, as we realize getting any new piece of equipment up and running in as little time as possible
is imperative to production.
Additional manuals may ship with your Qube that provide detailed operation and maintenance instructions
for the Tuthill blower and the electric motor included with your Qube. We urge you to read and understand
all operation and maintenance instructions prior to startup.
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 1012-1:1996 - Compressors and vacuum pumps - Safety Requirements - Part 1: Compressors
1.2 SCOPE OF MANUAL
The scope of this manual and the Declaration of Conformity, if supplied, includes the bare shaft rotary
positive displacement blower.
2. CONVENTIONS AND DATA PLATE
2.1 GRAPHIC CONVENTIONS IN THIS 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.

4
CAUTION
Indicates that a potential hazard may occur which, if not avoided, could
result in minor or moderate injury.
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
General Operation and Symbols on Data Plate:
MODEL NUMBER: This identies the specic model and designation of the package.
SERIAL NUMBER: Each package has a unique serial number. This number is to be used with
any service issues and with any contact with the manufacturer.
MAWP: This states the maximum allowable working pressure (MAWP) of the package.
BLOWER SHAFT SPEED: This is the shaft speed of the blower (airend).
YEAR BUILT: This states the year that the package was manufactured.
MOTOR SIZE: This is the size of the motor in horsepower (HP) and kilowatt (kW).

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This label is placed on the front of the machine. The covers (doors) shall
not be opened while the machine is in operation. Proper lock-out, tag-
out procedures should be followed.
This label is placed at the process outlet. The outlet can approach
temperatures as high as 400° F (204° C).
This label is placed at the process outlet. High pressure and ow exist
at the process outlet with exposure to pressure relief valve.
3. DESCRIPTION
TABLE 1 — SPECIFICATIONS
MODEL MAX. RPM
MAWP
psi / bar
APPROXIMATE WEIGHT
LBS. / KG
WITHOUT MOTOR WITH MOTOR
400 4800 18 / 1241 824 / 374 1599 / 726
800 4000 18 / 1241 2550 / 1157 3550 / 1611
1600 3200 18 / 1241 3202 / 1453 5202 / 2360
For additional bare shaft blower information, refer to the appropriate bare shaft blower manual.
NOTE
Maximum ambient temperature is 104° F (40° C)

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To permit continued satisfactory performance, a blower 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 blower sizes when operated under the
standard atmospheric conditions. Do not exceed any one of these limits.
NOTE
Special attention must be paid when a blower 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.
4. INSTALLATION
DANGER
The blower is not intended to be used with explosive products or in explosive
environments.The blower is not intended to be used in applications that
include hazardous gases.
The blower is not intended to be used in applications that include hazardous
gases.
DANGER
It is the responsibility of the installer to assure that proper guarding is in
place and compliant with all applicable regulatory requirements.
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
The Specications Table (Table 1) states the maximum operating speed
in RPM (rotations per minute), the maximum pressure. Do not exceed
these limits. The installation of the blower shall take these critical operating
parameters into account and adequate control features implemented.
WARNING
Pipe loading on the blower should be negligible as pipe loading can cause
distortion of the blower. Use proper supports and pipe hangers to assure
that there is no loading.
CAUTION
Upon completion of the installation, and before operation, assure the proper
rotation of the blower and that the blower rotates freely. If the blower does
not rotate freely, look for uneven mounting, piping strain, excessive belt
tension or any other cause of binding. If blower is removed and still does
not move freely, check inside the blower housing for foreign material.
CAUTION
Must check to see if the cooling fan rotates freely and has no contact with
the shroud. If there is contact, fan adjustment must be made.

7
NOTE
The blower package must be handled using an appropriate device such
as a fork truck. See the Specications Table (Table 1) for approximate
weights. Care should be taken to assure blower does not over-turn during
handling and installation.
4.1 UNPACKING AND HANDLING
Your Qube was shipped from Tuthill Vacuum
& Blower Systems in perfect and undamaged
condition. Occasionally, damage will occur during
shipping. Be sure to carefully inspect your Qube
for shipping damage, and if any damage is found,
report it immediately to the carrier who will assist
you with ling a freight damage claim.
To move your Qube to its installation site we
recommend that you leave it on its shipping skid if
possible. If not, the forks should extend the width of
your Qube and padding should be placed between
your Qube and the fork truck boom.
If it is necessary to lift your Qube with a crane, we recommend the use of spreader bar and chains. The
spreader bar should be greater than the width of your Qube and padding should be placed on the edges of
the enclosure to prevent chain damage.
Remove shipping braces from below motor mounting plate.
4.2 STORAGE
In some cases it may be necessary to store your Qube for extended periods of time before placing the unit
in operation. When this is required do the following:
1. Cover and seal all machine openings to prevent t he entrance of water and dirt.
2. Cover all openings of open dripproof motors to prevent the entrance of rodents.
3. We do not recommend outside storage, but if it is the only alternative, be sure to drain all traps and
attendant piping if the storage conditions can reach below 36° F (2° C).
4. Cover with a waterproof tarpaulin that can be easily removed for in storage maintenance.
5. While in storage hand rotate the blower and motor every two to three months to prevent at spots on
the bearings that will lead to premature failure.
6. At the end of the storage period, follow the unpacking and startup procedures. If stored for more
eighteen months you should contact Tuthill Vacuum & Blower Systems before placing your Qube into
service.
4.3 LOCATION
Install your Qube in a room or outdoor area that supplies adequate space and lighting for routine maintenance.
The installation area should also be well ventilated and kept as cool as possible. This is important because
operating at elevated temperatures can result in nuisance overload or temperature shutdowns.
Figure 1 - Proper handling and lifting procedure
(Qube 800 shown)
Remove fork truck pocket covers prior to lifting.
Replace fork truck pocket covers once installed.
FORKLIFT
CONTROL
PANEL
SIDE
PADDING
SPREADER BAR
AND CHAINS

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4.3.1 LEVELING
The Qube blower system should be placed on a level, even, at, vibration-less surface to avoid equipment
damage. The Qube blower system shall be level to 1/8” per 10 feet (this equates to a leveling tool with an
accuracy of at least 0.001”/in., readily available levels have accuracy of 0.0005”/in.). Level the unit and
adjust with shims as required.
NOTE
An un-level unit can result in improper oil level and catastrophic failure of
the unit.
4.3.2 FOUNDATION
Your Qube blower system does not need a special foundation, however it does require a solid, level oor
and adequate frame support. Bolt the blower system to the oor and seal any cracks around the perimeter.
4.4 SAFETY
DANGER
Assure that properly sized pressure relief valves and vacuum breaks/relief
valves are used on the inlet and outlet side of the blower.
WARNING
Use lock out/tag out procedures to disable the electrical energy source
before any service or work is done on the blower.
4.5 COOLING AIR INTAKE AND DISCHARGE
To minimize maintenance, supply your blower with the cleanest air possible. It is important that the air does
not contain any ammable or toxic gases, as the blower will concentrate these gases. This could result in
damage to the unit and surrounding property and lead to personal injury or death. The louvered area in the
rear of the Qube enclosure provides blower air intake (on atmospheric inlet systems) and air intake for the
cooling fan. Do not block or restrict this opening or the blower and/or motor may overheat and fail.
The supply air for the cooling fan is provided through the blower air intake louvers, located on the lower
side of the Qube enclosure. Do not block or restrict this opening or the blower and/or motor may overheat
and fail.
Likewise, the cooling air discharge, located on the upper side of the Qube enclosure, must be free from
restriction or blockage. Any ducting or louvering must not exceed .25 inches of water column (60 Pa) static
head. Excessive restriction to the discharge cooling air will cause the blower and/or motor to operate at
elevated temperatures, possibly resulting in overheating and failure. Ducting of cooling air to the unit is not
generally recommended.
WARNING
Do not use air blowers on explosive or hazardous gases. Each size
blower has limits on pressure differential, running speed, and discharge
temperature. These limits must not be exceeded. Consult the manual
of the blower model being used for details pertaining to the allowable
performance criteria.

9
If it is necessary to take air from a remote source, such as in a vacuum application, a vacuum kit will be
necessary. The piping should be at least the same diameter of the blower 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 blower 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.
4.6 MOTOR AND ELECTRICAL CONNECTIONS
All electrical wiring should be performed by a qualied and licensed electrician in compliance with NEC and
IEC standards and local codes as applicable. Be sure to investigate the local requirements before installing
your Qube. For the Drive Motor, refer to the data plate on the drive motor for wiring details. The power
supply should be adequate and free of parasitic loads that will cause an undervoltage condition during the
operation of the blower. Otherwise, nuisance electrical shutdowns will result.
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.

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4.7 PIPING
The intake and discharge
connections on your Qube are
large enough to handle maximum
volume with minimum friction
loss. If remote blower air intake
is used, be certain all external
intake piping is internally clean
before connecting to your Qube.
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.
CAUTION
The piping shall be the same size as the discharge connection on the blower
package. Smaller connections can cause higher discharge pressure.
FRONT VIEW
FRONT VIEW
QUBE 1600
QUBE 800
QUBE 400
FRONT VIEW END VIEW BACK VIEW
TOP VIEW
TOP VIEW
TOP VIEW ISOMETRIC VIEW
ISOMETRIC VIEW
ISOMETRIC VIEW
END VIEW BACK VIEW
END VIEW BACK VIEW
PRESSURE
OR OPTIONAL
VACUUM
GAUGE
OIL
LEVEL
OIL
LEVEL
DISCHARGE
CONNECTIO
N
OPENING FOR
OPTIONAL REMOTE
BLOWER AIR INTAKE
PRV
OPENING
INLET
EXHAUST
INLET FILTER
RESTRICTION
GAUGE
PRESSURE
OR OPTIONAL
VACUUM
GAUGE
INLET FILTER
RESTRICTION
GAUGE
FORK LIFT
POCKET
COVER
FORK LIFT
POCKETS
PRESSURE
OR OPTIONAL
VACUUM
GAUGE
OIL
LEVEL
INLET FILTER
RESTRICTION
GAUGE
PRESSURE
RELIEF
VALVE
DISCHARGE
CHECK
VALVE
PRESSURE
RELIEF
VALVE
DISCHARGE
CHECK
VALVE
DISCHARGE
CONNECTION
BLOWER
AIR
INLET
CABINET
AIR
EXHAUST
12”
(304 mm)
TO
WALL
24”
(609 mm)
TO
WALL
24”
(609 mm)
TO
WALL
36” (914 mm) MIN.
VERTICAL CLEARANCE
FOR HOT EXHAUST AIR
CABINET
AIR
INLET
CABINET
AIR
EXHAUST CABINET
AIR
INLET
BLOWER
AIR
DISCHARGE
FORK LIFT
POCKET
COVER
OPTIONAL
OPENING FOR
REMOTE BLOWER
AIR INTAKE
Figure 2 - Locations of Qube Connections and Features

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NOTE
Damage to the blower could occur if there is blockage in the inlet or outlet
ports or piping. Care should be taken when install the blower to assure that
there are no foreign objects or restrictions in the ports or piping.
NOTE
Vacuum discharge must be piped away for sound/temperature requirements.
Tuthill recommends placing a 16-mesh wire screen backed with hardware cloth at the remote inlet connection
of your Qube for the rst 50 hours of use, until the system is clean. Clean the screen after a few hours of
operation and discard of it once the system is clean. It is important to dispose of the screen at this time, as
it will eventually deteriorate and small pieces going into the blower can cause serious damage.
A ex connector at the intake (if piped away) and discharge connections shall always be used.
NOTE
Failure to use ex connectors at the intake and discharge connectors will
cause stress at these location and could cause connection and equipment
failures.
External piping at the intake and discharge connections shall be fully supported.
NOTE
Failure to properly support the pipe at the intake and discharge connections
will result in stress in these locations and could result in the unit being un-
level.
Figure 3 - Vacuum Package Installation
NOISE LEVELS ARE BASED ON RADIANT NOISE FROM THE ENCLOSURE. INLET (VACUUM) AND DISCHARGE PIPING WILL REQUIRE
INSULATION AND A SILENCER FOR LOCAL VENTING. ALL DEVICES IN AIR SYSTEM WILL BE ACOUSTICALLY INSULATED.
NOISE LEVELS ARE BASED ON THE UNIT BEING INSTALLED ON A SOLID SURFACE. ADDITIONAL INSULATION IS REQUIRED IF THE
UNIT IS ELEVATED.
A > = 20 FEET (6.09 METRES)
B > = 20 FEET (6.09 METRES)
FLEX
CONNECTORS
ACCOUSTICALLY
INSULATED INLET PIPE
ACCOUSTICALLY
INSULATED OUTLET PIPE
DISCHARGE SILENCER
(IF LOCALLY VENTED)
ACOUSTICALLY
INSULATED
INLET FILTER
A
B
AIRFLOW
AIRFLOW

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4.8 LUBRICATION
DANGER
There is a risk associated with the lubrication media breaking down and
resulting in a hazardous uid or vapour. 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.
WARNING
Never attempt to change or add oil while the blower is in operation. Failure
to comply with this warning could result in damage to the equipment and
serious personal injury. Oil must be checked while the blower is NOT
running.
WARNING
Properly dispose of the spent lubricants. Refer to the manufacturer of the
lubricant and any regulations to assure proper and safe disposal.
CAUTION
Do not start the blower until you are sure oil has been put in the gear
housing and front cover. Operation of the blower without proper lubrication
will cause the blower to fail and void the warranty.
4.8.1 OIL FILL INSTRUCTIONS
NOTE
Do not start up the blower until you are certain that it has been properly and
fully lubricated.
NOTE
Only check oil level when the machine is shut-down.
Before starting the unit, ll oil reservoir as instructed below. (see Figure 4 for
reference)
1. Pre-measure oil capacity for blower.
2. Remove oil ll cap
3. Pour oil through ll hole until oil appears in the oil level safety indicator.
4. Slowly bring oil level up to the center of the indicator.
5. Allow at least 10 minutes for the oil level to equalize and add or remove as
required.
6. Reinstall oil ll cap.
NOTE
It is important to maintain the proper oil level in the blower. Severe damage
can occur if the blower is overlled.
MODEL
OIL
QUARTS
LITERS
Qube 400 0.75 – 1
0.71 – 0.95
Qube 800 2 – 2.5
1.9 – 2.4
Qube 1600 5 – 6
4.7 – 5.7

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OIL DRAIN
OIL FILL RESERVOIR
MODEL 800 SHOWN
OIL LEVEL
INDICATOR*
OIL DRAIN
OIL FILL RESERVOIR
QUBE 400 QUBE 800 AND 1600
OIL LEVEL
INDICATOR*
* Fill reservoir with
proper oil grade, allow
reservoir to drain, and
repeat process until
proper oil level is
maintained between
high and low oil level
indication.
Figure 4 - Oil Fill Diagrams
4.8.2 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.

14
5. OPERATION
WARNING
Do not operate without guards in place.
WARNING
Maximum operating speed: Table 1 states the maximum operating speed in
RPM (rotations per minute), the maximum pressure differential, maximum
vacuum and maximum temperature rise. Do not exceed these limits.
WARNING
Physical harm may occur if human body parts are in contact or exposed to
the process pressures or vacuum. Assure that all connections are protected
from human contact.
WARNING
If rated pressure or vacuum levels are exceeded, process uids will migrate
to other parts of the blower and system.
CAUTION
Do not touch hot surfaces.The upper limit of the blower operation is 445º F
(229º C). Do not touch the blower while it is in operation and assure blower
is cool when not in operation.
CAUTION
Do not stop the blower if there are high outlet pressures in the outlet piping.
Unload the outlet piping prior to shutting down the blower.
CAUTION
Hearing protection is required while the blower is in operation. Noise levels
may exceed 75 dBA.
NOTE
The upper limits are not intended for continuous operation. Consult with
factory for detailed information assistance.

15
5.1 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 blower 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 blower, 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.
5.2 STOPPING
CAUTION
Do not stop the blower if there are high outlet pressures in the outlet piping.
Unload the outlet piping prior to shutting down the blower.
5.3 PRESSURE RELIEF VALVE
Your Qube includes a pressure relief valve (or PRV) to prevent over-
pressurizing of the blower, silencer, check valve, and discharge piping.
The pressure relief valve is a high ow, reliable spring based piston
type with adjustable pressure rating.
The pressure relief valve will open any time the operating pressure
of the blower reaches the set pressure of the valve. It is important to
note that the opening of the relief valve is an indication that something
is wrong in the downstream piping system, from a closed isolation
valve to a buildup of material in a discharge pipe, or some other type
of obstruction. If the valve opens, indicated by a popping sound and
the rush of air escaping, you should shut down your Qube immediately
and determine the cause of obstruction in the discharge piping. Do not
simply tighten the valve to the point that the valve stops making noise. Figure 5 - Pressure Relief
Valve Detail
VALVE
ADJUSTMENT
STEM
FLOW

16
The recommended setting for the pressure relief valve is 10% greater than the operating gauge pressure of
the blower, but not less than 1 PSIG (7 kPa) above the operating gauge pressure of the blower. The valve
is set to the proper pressure at the factory, however changes can occur during shipment so it is important
that the valve be tested at initial start-up. Setting adjustments may also be necessary when you move your
Qube, or if there is a change in process parameters.
If you need to adjust the pressure relief valve setting, follow the procedure shown below:
1. Turn off and lock out power to your Qube.
2. Avoid overtightening of valve during installation.
3. Vacuum setting may be varied approx + or - 10% of original setting by removing hood and running
pressure screw in or out as desired.
NOTE
Retighten locknut after each adjustment
4. Valve may be cleaned by removing disc and cleaning seat surface with a soft cloth. Seating surface
may be lapped in case of leakage by using a ne grit compound.
5. Install Qube enclosure panels and secure the 1/4-turn fasteners.
6. Unlock the power and start your Qube.
NOTE
As with all standard manufactured discharge silencers supplied with rotary
positive displacement blowers, the discharge silencer included with your
Qube is of a design that is not ASME code stamped. Local jurisdictions
may require any pressure vessel that can experience pressure greater
than 14.9 PSIG (1027 mbar g) to be ASME code stamped. Consult your
insurance carrier if operation above 14.9 PSIG (1027 mbar g) is required.
Please note, this does not apply to Qube 400 as it has an integral silencer.
5.4 ACCESSORIES
(In addition to the following, other accessories are available, please consult factory).
5.4.1 NOISE CONTROL ENCLOSURE
Qube includes a fabricated and insulated sheet steel noise control enclosure designed for the reduction of
noise that emanates from the blower and the electric motor.
5.4.2 INTEGRAL SILENCER/BASE
Tuthill has incorporated the discharge silencer into the base to reduce the package size. It also enhances
the structural integrity of the base. It has a reactive type silencer that utilizes multiple passes and paths to
create sound losses through out-of-phase cancellation of sound waves. NOTE: This applies to Qube 800 &
1600 Only as Qube 400 has an integral blower silencer.
5.4.3 COOLING FAN
Each Qube system is supplied with an axial ow fan driven on the blower shaft, to exhaust heat from the
enclosure.

17
5.4.4 AIR FILTER RESTRICTION GAUGE
The air lter restriction gauge included with your Qube is a direct reading gauge designed specically for
use with dry air lters with atmospheric intake. As the lter deteriorates, air inow will decrease creating
increased vacuum between the air lter and the blower. This vacuum is monitored by the air lter restriction
gauge, which gives a visual indication of the lter condition.
This feature is particularly useful for blowers operated in dusty environments. Unlike traditional pop-up or
latch-up type indicators, the air lter restriction gauge gives constant readout in meaningful terms of the
changing condition of your lter.
5.4.5 DISCHARGE PRESSURE GAUGE
The discharge pressure gauge included with your Qube is a diaphragm actuated, direct reading 2 inch
(50 mm) dial gauge. The mechanism is enclosed in a steel case that is coated to resist corrosion. A
polycarbonate, break-resistant lens and stainless steel bezel protect the gauge from exterior damage.
Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber.
A built-in pulsation dampener stabilizes the indicating needle and is removable for cleaning.
5.4.6 CHECK VALVE
Your Qube includes a discharge swing type check valve designed for minimum pressure loss and positive
closure on shutdown. The Qube check valve is a low-loss, swing type check valve. Its ‘T’ pattern design
allows for easy maintenance if necessary.
Swing check valves can fail to operate if not properly maintained. Frequently check for damaged, loose,
or missing parts. With power off and locked out, hand operate valve to insure springs are in good working
order and the apper seats properly without restriction. Repair or replace valve if problems are encountered.
The valve can be removed by removing four screws from sheet metal shroud. Then remove four bolts from
check valve housing assembly.
CAUTION
NEVER inspect the valve with your Qube running. This can result in severe
damage or injury.
NOTE
We recommend that you inspect the valve monthly by removing the
inspection cap and examining the internal workings. Check for wear and
hang-up of the apper mechanism. If apper drags across body or is
restricted in movement, remove valve from service and repair. Apply anti-
seize compound to entire mating surface between cap and body to aid
removal during subsequent inspections.
NOTE
Orientation of the check valve is critical. Inspection cap must be located
at the valve top, and the valve direction arrow must be pointed toward the
Qube discharge pipe connection and away from the blower. Pointing the
check valve direction arrow toward the blower will starve the blower inlet
and cause immediate failure.

18
6. MAINTENANCE
DANGER
The blower and parts may contain hazardous media. Assure that blower
and parts are evacuated of hazardous media prior to servicing.
CAUTION
The electrical service must be isolated and de-energized prior to
maintenance. Apply appropriate procedures to assure electrical supply is
de-energized and cannot be inadvertently energized during maintenance.
Assure piping and product is isolated prior to maintenance of blower. Apply
appropriate procedures to assure piping and product is isolated and that
inadvertent opening of valves cannot occur during maintenance.
CAUTION
During routine maintenance, inspect and assure that guards are in place
and secure.
NOTE
Current regulations require Material Safety Data Sheet to be completed and
forwarded to Tuthill Corporation on any unit being returned for any reason
which has been handling or involved with hazardous gases or materials.
This is for the protection of the employees of Tuthill Corporation who are
required to perform service on this equipment. Failure to do so will result
in service delays.
6.1 OIL INDICATOR, FILL AND DRAIN
The Qube oil can be completely serviced from the front of the machine, see Figure 4. An indicator is
provided to show minimum and maximum oil levels. The oil can be drained by removing the drain cap. Oil
can be added via the clear plastic reservoir. Check oil level only when the machine is shut-down.
6.2 AIR FILTER
Your Qube is equipped with an air lter (except closed-loop systems) designed for minimum pressure loss
and proper ltration of atmospheric inlet air. The air lter element is a disposable pleated paper, radial n
type. We recommend regular replacement of the lter when pressure loss exceeds 15 inches (38 cm) of
water column pressure loss.
Optional lter elements (felt, wire mesh, polyester) are available, consult factory.
NOTE
DO NOT USE COMPRESSED AIR TO CLEAN THE FILTER ELEMENT.
This can result in damage to the lter media and reduce its ltration
effectiveness. NEVER operate your Qube without adequate inlet air
ltration or unwarrantable damage to the blower can occur.
Remove and replace lter element as follows:
1. Turn off and lock out power to your Qube.
2. Remove top panel door. (5/16” hex head wrench required).
3. Remove the lter retainer housing nut and washer.
4. Remove the lter cover housing off the threaded stud.
5. Remove the element off the lter base plate.

19
6. Clean inside of lter base plate and housing as necessary, taking care not to sweep any debris into the
blower intake piping.
7. Place a new or cleaned element on the lter base plate.
8. Install lter retainer housing with the nut and washer that were removed in step 3.
9. Install Qube enclosure top panel and secure the quarter-turn fasteners.
10. Unlock the power and start your Qube.
6.3 V-BELTS
Qube incorporates an innovative, automatic V-belt tensioning system combining motor mass and spring
tension to maintain a constant and appropriate force on the V-belts, lengthening belt life. (See Figure 6)
Additionally, the automatic V-belt tension system provides for even tension on the belts throughout the
operating life of the belts, reducing wear on the belts, shafts and bearings. A visual inspection of the V-belt
drive should yield the appearance shown in Figure 7.
The Qube also has a visual
indicator for the belt tension
and is set at the factory;
however, this setting may
have changed in transit,
necessitating adjustment.
When the belt is properly
tensioned the visual indicator
(pin) is at the top position. As
the belts stretch the indicator
moves downward. When the
pin reaches the lower most
position the belt tension
should be readjusted such
that the indicator is again in
the bottom position.
It is recommended to check
belt tension monthly and make
any manual adjustments
found necessary:
1. Turn off and lock out
power to your Qube.
2. Turn top latches and
open top panel of the
enclosure.
3. Remove front door by
removing (2) bolts and
lifting door.
4. If visual indicator pin has
not reached the bottom of
the indicator slot, then the
belt(s) is (are) properly
tensioned and no
adjustments are required.
If the visual indicator pin
has reached the top of
the indicator slot then
the belt(s) needs to be
re-tensioned by following
the remaining steps.
Figure 6 - Auto Belt Tension System and visual indicator
SEE
A AND B
AT RIGHT
THE BELT IS
PROPERLY TENSIONED
WHEN THE INDICATOR
IS AT THE TOP.
WHEN THE
INDICATOR IS AT THE
BOTTOM, TIGHTEN
WHERE INDICATED.
THE BELT IS
TENSIONED WHEN
INDICATOR IS AT THE
BOTTOM
SEE A AND B AT RIGHT
SEE A AND B AT RIGHT
SEE B AT RIGHT
SEE B AT RIGHT
WHEN INDICATOR IS AT
TOP, TIGHTEN WHERE
INDICATED AND MOVE
INDICATOR DOWN
THE BELT IS TENSIONED
WHEN INDICATOR IS AT
THE BOTTOM
WHEN INDICATOR IS
AT TOP, TIGHTEN
WHERE INDICATED
TIGHTEN
HERE
TIGHTEN
HERE
TIGHTEN
HERE
DETAIL A
QUBE 800
QUBE 1600
QUBE 400
DETAIL B
DETAIL ADETAIL B
DETAIL ADETAIL B

20
5. Turn the bottom nuts to tension the belt(s)
while holding the top nuts. This action
moves the indicator upward. Continue
tightening the bottom nuts until the indicator
pin is again at the top of the indicator slot.
6. Replace/close and latch the front panel/
doors. Lower the top panel and latch.
7. Unlock the power and start your Qube.
8. Resume normal operation.
6.4 PREVENTATIVE MAINTENANCE
A good maintenance program will add years of
service to your blower. A newly installed blower
should be checked frequently during the rst
month of operation, especially lubrication. Check
oil level in both the drive end and gear end of
the blower and add oil as needed. Complete
oil changes are recommended every 1000
operating hours, or more frequently depending
on the type of oil and oil operating temperature.
The following is recommended as a minimum
maintenance program.
DAILY WEEKLY MONTHLY
1. Check and maintain oil level,
and add oil as necessary.
2. Check for unusual noise or
vibration (See Troubleshooting)
1. Clean all air filters. A
clogged air filter can seriously
affect the efficiency of the
blower and cause overheating
and oil increased oil usage.
Replace if necessary.
1. Inspect the entire system for leaks.
2. Inspect condition of oil and change if necessary.
3. Check drive belt tension and tighten if
necessary.
4. Inspect check valve.
6.5 LONG TERM STORAGE
Any time the blower will be stored for an extended period of time, you should take make sure that it is
protected from corrosion by following these steps:
1. Spray the interior (lobes, housing and end plates) with rust preventative. This should be repeated as
conditions dictate and at least on a yearly basis.
2. Fill both end covers completely full of oil.
3. Firmly attach a very prominent tag stating that the end covers are full of oil and must be drained and
relled to proper levels prior to startup.
4. Apply a rust preventative grease to the drive shaft.
5. Spray all exposed surfaces, including the inlet and discharge anges, with rust preventative.
6. Seal inlet, discharge and vent openings. It is not recommended that the unit be set in place, piped to
the system, and allowed to remain idle for a prolonged amount of time. If any component is left open
to the atmosphere, the rust preventative will escape and lose its effectiveness.
7. During storage, ensure that the blower does not experience excessive vibration.
8. Attach a desiccant bag to either of the covers to prevent condensation from occurring inside the blower.
Make sure any desiccant bag (or bags) is so attached to the covers that they will be removed before
startup of the blower.
9. Store the blower in an air conditioned and heated building if at all possible. At least insure as dry
conditions as possible.
10. If possible, rotate the drive shaft by hand at least monthly in order to prevent seals from setting in one
position.
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 7 - General appearance of a V-Belt drive
Figure 8 - Setting of proper tension for a V-Belt drive