Tuthill KINNEY KMBD Series Operating instructions

KINNEY® KMBD™ SERIES
Manual 1814-3
Mechanical Vacuum Boosters
Models 200 240 400 540 720 850 1600 2000 2700
INSTALLATION
OPERATION
MAINTENANCE
REPAIR MANUAL
WARNING
DO NOT OPERATE
BEFORE READING MANUAL
07/2014
Tuthill Vacuum & Blower Systems
4840 West Kearney Street
Springfield, Missouri USA 65803-8702
o 417.865.8715 800.825.6937 f 417.865.2950
www.tuthillvacuumblower.com

2
SAFETY INSTRUCTIONS
1. Do not operate before reading the enclosed instruction
manual.
2. Use adequate protection, warning and safety equipment
necessary to protect against hazards involved in installation
and operation of this equipment.
NOTICE
1. The safety instruction tags shown below were attached to
your unit prior to shipment. Do not remove, paint over or
obscure in any manner.
2. Failure to heed these warnings could result in serious
bodily injury to the personnel operating and maintaining
this equipment.
SAFETY WARNINGS
• Keep hands and clothing away from rotating machinery, inlet and discharge openings.
• Booster and drive mounting bolts must be secured.
• Drive belts and coupling guards must be in place.
• Noise level may require ear protection.
• Booster heat can cause burns if touched.
TUTHILL VACUUM AND BLOWER SYSTEMS — SPRINGFIELD, MO USA
SAFETY PRECAUTIONS
For equipment covered specifically or indirectly in this instruction book, it is important that all personnel observe safety precautions
to minimize the chances of injury. Among many considerations, the following should particularly be noted:
• Booster casing and associated piping or accessories may become hot enough to cause major skin burns on contact.
• Internal and external rotating parts of the booster and driving equipment can produce serious physical injuries. Do not reach
into any opening in the booster while it is operating, or while subject to accidental starting. Cover external moving parts with
adequate guards.
• Disconnect power before doing any work, and avoid bypassing or rendering inoperative any safety or protective devices.
• If booster is operated with piping disconnected, place a strong, coarse screen over the inlet and avoid standing in discharge air
stream.
• Avoid extended exposure in close proximity to machinery with high intensity noise levels.
• Use proper care and good procedures in handling, lifting, installing, operating, and maintaining the equipment.
• Other potential hazards to safety may also be associated with operation of this equipment. All personnel working in or passing
through the area should be warned by signs and trained to exercise adequate general safety precautions.
• Hearing protection may be required depending on silencing capabilities.
IMPORTANT
In order to assure you of the full benefits of our product warranty, please complete, tear out and return the warranty registration card
located on the back cover of this manual, or you can register your product online at:
http://www.tuthillvacuumblower.com/index.cfm/contact-us/product-registration/
WARNING
Keep body and
clothing away from
machine openings.
WARNING
Hearing
Protection
Required
CAUTION
Do not
operate without
guards in place.
CAUTION
Do not
touch hot
surfaces.

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TABLE OF CONTENTS
SECTION PAGE
SAFETY PRECAUTIONS 2
INTRODUCTION 4
DESCRIPTION 4
INSTALLATION 4
GENERAL 4
SAFETY 4
LUBRICATION 5
PIPING CONNECTIONS 5
COOLING WATER SPECIFICATIONS 6
MOTOR DRIVES 6
DIRECT COUPLED 6
V-BELTS 6
ELECTRICAL CONNECTIONS 7
OPERATION 7
STARTING 7
OPERATING 7
STOPPING 7
MAINTENANCE 8
GENERAL 8
SPARE PARTS 8
REPAIR SERVICE 8
DISASSEMBLY AND ASSEMBLY INSTRUCTIONS 8-12
DISASSEMBLY — KMBD-200, 400 8
ASSEMBLY — KMBD-200, 400 9
GENERAL 9
DISASSEMBLY — KMBD-540, 720, 850, 1600, 2000, 2700 11
ASSEMBLY — KMBD-540, 720, 850, 1600, 2000, 2700 12
GENERAL 12
FREQUENTLY ASKED QUESTIONS 15
CLEARANCES 16
TORQUE CHART 16
BYPASS MODELS - KMBD-400BP & KMBD-720 BP 17
DRAWINGS AND PARTS LISTS 18-26
KMBD-200 AND KMBD-300 PARTS LIST 18
KMBD-540 AND KMBD-720 PARTS LIST 19
KMBD-850, 1600, 2000, AND 2700 PARTS LIST 20
ASSEMBLY PRINTS FOR KMBD-200 AND 400 CUTAWAY VIEW 21
ASSEMBLY PRINTS FOR KMBD-200 AND 400 SIDE AND END VIEWS 22
ASSEMBLY PRINTS FOR KMBD-540 AND KMBD-570 CUTAWAY VIEW 23
ASSEMBLY PRINTS FOR KMBD-540 AND KMBD-570 SIDE AND END VIEWS 24
ASSEMBLY PRINTS FOR KMBD-850, 1600, 2000, AND 2700 CUTAWAY VIEW 25
ASSEMBLY PRINTS FOR KMBD-850, 1600, 2000, AND 2700 SIDE AND END VIEWS 26
WARRANTY – VACUUM PRODUCTS 30

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INTRODUCTION
CONGRATULATIONS on your purchase of a new Mechanical Vacuum Booster from Tuthill Vacuum & Blower Systems. 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.
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 blower. 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.
WARNING: Serious injury can result from operating or repairing this machine
without first reading the service manual and taking adequate safety precautions.
IMPORTANT: Record the booster 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 identification on any replacement part
orders, or if you require service or application assistance.
This manual covers the installation, operation, and maintenance of the Tuthill
Vacuum & Blower Systems Mechanical Vacuum Boosters listed in Table 1.
DESCRIPTION
The Mechanical Vacuum Boosters manufactured by Tuthill Vacuum & Blower
Systems are lobe type, positive displacement units, designed with extra heavy shafts
and bearings to permit high power input. They incorporate a unique rotor profile in
which all gas joints or mating surfaces are sealed vacuum tight. Unit construction
consists of two figure-eight shaped rotors enclosed in a precision machined housing
supported at each end by precision bearings. The power drive turns the drive rotor
directly and rotates the driven rotor by means of specially forged, heat treated,
crowned and ground precision helical gears. Efficient and effective vacuum pumping
is accomplished by trapping a volume of gas at the booster inlet and between each
rotor and the booster housing. This volume of gas is quickly and cleanly evacuated
by the fast revolving rotors which carry the air to the exhaust side of the booster
where the air is then discharged to the backing pump.
INSTALLATION
GENERAL
Carefully check to ensure that no transit damage has been sustained. If damage has
occurred from shipment a claim must be filed with the carrier immediately; preserve
the shipping container for inspection by the carrier. Do not return the booster to the
factory without first obtaining shipping instructions from us.
Remove protective covers and plugs only as connections are made. Mount the booster on a flat, level surface of sufficient rigidity.
Shim under the legs where necessary so as to have each leg of the booster support a proportional share of the booster weight. This
is necessary to prevent eventual twisting of the booster.
SAFETY
Booster housing and associated piping or accessories may become hot enough to cause major skin burns on contact. 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.
Avoid extended exposure in close proximity to machinery with high intensity noise levels. Wear adequate ear protection. Use proper
care and good procedures in handling, lifting, installing, operating, and maintaining the equipment.
LUBRICATION
TABLE 1
KMBD
MODELS
200, 400,
540, 720,
850, 1600,
2000 &
3000
(1)
MECHANICAL
SEAL
(2)
SLINGER
SEAL
(1) Interconnecting cooling water between drive
shaft bearing housing and the two oil reservoirs.
Mechanical seals are used throughout.
(2) Water cooled only at drive shaft bearing
housing. Rotor seals are slinger type and a
mechanical seal on the drive shaft.
Figure 1 - Illustration of flow
direction in a vacuum booster

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TABLE 2 — SPECIFICATIONS
KMBD
MODEL
APPROXIMATE OIL CAPACITY
QUARTS / LITERS PORT SIZE
INCH / MM
MAX.
RPM
APPROXIMATE WEIGHT
LBS. / KG
VERTICAL HORIZONTAL VERTICAL HORIZONTAL
400
400BP 1 / 0.95 0.5 / 0.47 4 / 100 2 / 51
3600
195 / 90
400 / 180
180 / 90
N/A
540
720
720BP
1.5 / 1.42 1 / 0.95
4 / 100
4 / 100
2.5 / 63.5
260 / 120
300 / 135
560 / 255
240 / 110
280 / 130
N/A
850
1600
2000
2700
4 / 3.79 2.5 / 2.37
**
6 / 150
10 / 250
430 / 195
580 / 265
685 / 310
790 / 360
450 / 205
540 / 245
645 / 295
750 / 340
** Horizontal flow units are available with 6” (150 mm) ports on inlet and discharge as standard.
Vertical flow units have 6” (150 mm) on top and 3” (80 mm) on bottom.
Kinney KV-100 oil is recommended for use on boosters with typical vacuum applications. Consult Tuthill Vacuum & Blower Systems
about oils for use where hazardous or chemically active materials may be present. NOTE: See “Frequently Asked Questions” on
page 15 for additional information regarding lubrication.
Add vacuum oil to the booster in the quantity shown in Table 2. The oil level must be maintained within the notched area of the sight
glass. See Figure 2. Lower drive units (horizontal flow) have “bull’s eye” type oil level gauges. Maintain oil levels at the center of the
glass. Oil may not be added while booster is operating. Oil reservoirs are under vacuum.
PIPING CONNECTIONS
Manifolding should be no smaller than the pump connections in order to minimize restrictions to gas flow. Accurately align the mating
flanges to the inlet and discharge manifolding to prevent distortion of the booster housing. Temporarily fit a fine wire mesh filter at the
suction port if solid particles are likely to be entrained into the air stream and remove the filter 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 fitted with flexible 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 3 for
connection locations.
The partly water-cooled slinger version has cooling water to the seal adapter housing only. The cooling coils and interconnecting
water line are omitted and the interconnecting line leading from the seal adapter housing is led to the drain.
Figure 2 - Location of oil fill, drain and level plugs and level gauges
OIL FILL
(1) EACH END PLATE HORIZONTAL FLOW
OIL LEVEL GAUGE
(1) EACH END PLATE
FILL TO CENTER OF GAUGE
OIL LEVEL GAUGE
(1) EACH END PLATE
FILL TO CENTER OF GAUGE
OIL FILL
(1) EACH END COVER
OIL FILL
(1) EACH END COVER
ALTERNATE OIL
LEVEL PLUG
(2) EACH END PLATE
MAGNETIC OIL
DRAIN PLUG
(1) EACH END PLATE
MAGNETIC OIL
DRAIN PLUG
(1) EACH END PLATE
OIL LEVEL SIGHT GAUGE
(1) EACH END PLATE
MAINTAIN OIL LEVEL
WITHIN NOTCHED AREA
ENLARGE VIEW
OF SIGHT GAUGES
MAX
MIN
MAX
MIN
MAINTAIN OIL LEVEL
WITHIN NOTCHED AREA
MAINTAIN OIL LEVEL
WITHIN NOTCHED AREA
*KMBD MODELS 200 & 300 ARE
SIMILAR EXCEPT THE SIGHT
GAUGES ARE INVERTED
SOME HORIZONTAL FLOW BOOSTERS
MAY HAVE BULLSEYE SIGHT GAUGES.
MAINTAIN OIL LEVEL WITHIN NOTCHED AREA
VERTICAL FLOW HORIZONTAL FLOW
KMBD MODELS 540, 720, 850, 1600, 2000, 2700*

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The air-cooled configuration requires no cooling water. However,
cooling water can be circulated through the seal adapter housing
on most models without modification to the booster. Cooling the
bearing housing will prolong the life of the mechanical seal therein.
An on-off valve should be provided on the incoming line and a
regulating valve located in the drain line. The drain line should
terminate at an open drain to enable the operator to better
regulate the water flow.
Units that will operate with continuous discharge gas temperatures
of 250° F (121° C) or more must be connected to a water
(liquid) supply in order to maintain reasonable oil temperatures.
Generally a water flow of ½ to 1 GPM (1.9 - 3.8 L/min) is sufficient
to maintain oil temperatures below 150° F (65° C).
WARNING: If 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. Booster must be drained of
liquid during downtime unless a recirculating unit using a glycol
mixture has been installed.
NOTE: Units are never shipped from the manufacturer with liquid
in the coiling coils.
COOLING WATER SPECIFICATIONS
Flow rate: Less than 2 GPM (7.6 L/min) total for both end plates.
Maximum Pressure: 100 PSIG (6.895 bar G)
MOTOR DRIVES
Two drive connections commonly used are direct drive and V-belt
drive.
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.
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. Properly align the sheaves. V-belts should
be replaced in matched sets and the sheaves should be positioned
so as to allow the belts to be placed in the grooves without rolling
them onto the sheaves. The following tensioning steps can be
safely followed for all belt types, cross sections, number of belts
per drive, or type of construction.
1. With belts properly in their grooves adjust the sheaves until all slack has been taken up.
2. Start the drive and continue to tension the V-belt(s) until only a slight bow on the slack side of the drive appears while operating
under load conditions.
3. After 24 to 48 hours of operation the belts will seat in the sheave grooves. Further tensioning is then necessary as described in
Step 2. Insufficient 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
IN
OUT
COOLING
COILS
CAUTION:
INCOMING WATER PRESSURE
MUST NOT EXCEED 100 PSIG.
SEAL
ADAPTER
HOUSING
INTERCONNECTING
LINES
Figure 3 - Cooling Water Piping Harness
Figure 4 - Cooling Connections Types & Configurations

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for an extended period of time. For
more specific information consult
the drive manufacturer.
ELECTRICAL CONNECTIONS
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 5 shows direction of
air flow in relation to rotor rotation. The
air flow direction can be reversed by
reversing the appropriate motor leads.
OPERATION
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 2. 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 sufficiently, 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 flow so that the discharge water
temperature is no more than lukewarm (70° to 80° F [21° to 26° C]).
OPERATING
The upper temperature limits for booster pump operation are between 350° to 375° F (175° to 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.
NOTE: These upper limits are not for continuous operation. Consult with factory for detailed information or assistance.
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.
MAINTENANCE
GENERAL
Scheduled maintenance consists of changing lubricating oil every 250 to 1500 hours of operation. Change the oil more frequently if
Figure 5 - 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

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pumping corrosive vapors or where excessive operating temperatures are encountered. Boosters with mechanical seals on the rotors
can generally run the full 1500 hours before an oil change is required.
Proper oil drain schedules require oil be changed before the contaminant load becomes so great that the lubricating function of the
oil is impaired or heavy disposition of suspended contaminants occurs. To check the condition of the oil, drain a sampling into a clean
container and check for the presence of water or solids. Slight discoloration of the oil should not necessitate an oil change.
NOTE: When changing oil be sure to reseal the drain and fill plugs. This is especially important on 92/93 series which have no
mechanical seals on the rotors. Air leaks past these plugs can cause rapid loss of oil from end covers resulting in booster failure.
NOTE: Oil levels should be checked every 24 hours of operation.
SPARE PARTS
Refer to the parts list and exploded view for your particular model. Repair kits are available for all models. These kits contain all of
the seals, bearings, O-rings, locks and special retaining screws necessary for an overhaul. Always have the complete booster model
number and serial number when ordering.
In developing a stock of spare parts, consider the following:
• The degree of importance in maintaining the booster in a “ready” condition
• The time lag in parts procurement
• Cost
• Shelf life (seals and O-rings)
Contact Tuthill Vacuum & Blower Systems Service Department for any assistance in selecting spare parts.
Telephone: [phone] Toll Free (48 contiguous states): [phone] Facsimile: [phone]
REPAIR SERVICE
With proper care, Tuthill Vacuum & Blower Systems Mechanical Vacuum Boosters will give years of reliable service. The parts are
machined to very close tolerances and require special tools by mechanics who are skilled at this work. Should major repairs become
necessary, it is strongly recommended that the booster be returned to the factory for repair or to one of the authorized service facilities
that specialize in vacuum booster repair. Contact the factory for the location nearest you. Units which are still under warranty must
be returned to the factory, freight prepaid, for service.
DISASSEMBLY — KMBD-200, 400
NOTE: Items shown in brackets [ ] are referenced to item numbers shown on page 22.
1. Disconnect cooling water lines [274 & 181]. Do not disturb cover bushings [120] or it will be necessary to retest cooling coils for
leakage as described in the assembly procedure. Covers should be retested if water is detected in drain oil. (90/91 series only).
2. Drain oil from both ends of booster and remove inlet and outlet port fittings [38 or 48].
3. Remove spanner lock nut [83], dust washer [82], screws [93], and seal adapter housing [91]. Tap out seal [76] and discard
O-rings [92 & 140]. Remove spacers [77 & 74], adjusting shim [118] and discard O-ring [75].
4. Remove cap screws [26A & 26B] and both end covers [6 & 7]. Two jack screw holes are provided on each cover.
5. Remove lockwire [49], socket head screws [66], and drive shaft [45]. Using puller, remove bearing [50].
6. Remove flat head Allen screws [29] from end of each rotor shaft. Remove washers [25], spacers [57], and oil slinger [21]. NOTE:
The flat head screws have nylok in their threads and may be difficult to remove. Strike the head a couple of blows with a flat face
hammer for easy removal.
7. Mark housing, end plates, rotors, and gears before proceeding with disassembly. There are two methods which can be used to
disassemble the rest of the unit. Method “A” requires an arbor press and method “B” requires the use of bar or yoke pullers. See
puller drawing (T29603) on page 29.
8. Method A:
a. Place two support blocks, 5-1/2 to 6 inches (14 to 15.5 cm) high (hard wood or steel), on the bed of an arbor press. Set
the unit, with the gears pointing down, on the two blocks making sure the blocks support the rotor housing only. Press both
rotors out of free end bearings simultaneously.
b. Lift the housing off the rotors and remove the non-drive end plate [4] by tapping the end plate from the inside of the
housing. Place the rotor housing back over the rotors.
c. Set the unit on the support blocks with the gears pointing upward. Do not extend blocks into the rotor bores. The rotors
may now be pressed from the gear end plate. Do not damage rotors.
Method B:
a. Align timing marks on gears (Figure 6A). Rotate drive gear clockwise approximately three teeth and mark a matching
reference line on each gear as shown in Figure 6B. This gear position is necessary so rotors will clear and not jam. Do not
allow the gears to move from the matched reference line while pulling. Use a light rocking motion to insure that the lobes have

9
not jammed. Remove driven gear first then drive gear. WARNING: Failure to properly pull this gear could result in damage to
rotor keyway or a bent rotor shaft. Never use excessive force.
b. Remove button head Allen screws [30] and bearing retainer rings [14] from both end plates.
c. Attach a pair of bar pullers to the bearing bores of the free end plate. Use 10-32 x 4” long screws (no metric equivalent)
Alternately push both rotors from end plate. Separate end plate from housing.
d. Turn the unit around and attach a single bar puller to either bore and push rotor from end plate making sure the rotor is
vertical in the housing (for support) while removing. Repeat for opposite rotor. Note location of timing shims [16], oil slinger
[20], and spacers [17 & 18].
e. Tap end plate from housing.
9. Mechanical Seal Series - Tap out bearings from both end plates. Note location of spacers under bearings and retain for
reassembly. To remove seals [54] use a cape chisel or similar tool being careful not to nick or cut the bearing or seal bores.
Remove the labyrinth seal [51] in the same manner. The seals will be damaged by removal and must be replaced. 92/93
Series - Carefully tap out seal slinger [238], spacer [123], and bearings. The oil slinger stator [79] should not be removed
unless it is damaged or the end plate is to be replaced. NOTE: On some older units the oil seal slinger is made up of two
separate parts, items 238 & 129. The newer design combines these two parts and is identified as item 238.
10. Clean all parts with good grade of clean solvent and replace any worn or damaged parts with factory approved parts. New
bearings, seals, and O-rings should be installed at each assembly.
ASSEMBLY — KMBD-200, 400
GENERAL
NOTE: Items shown in brackets [ ] are referenced to item numbers shown on page 18.
The assembly procedure is generally the same for all series, but where there are differences, notations will be made. All vacuum
joints, end covers, seal casings and plugs should be sealed
with an RTV Silicone Sealer or equal, unless O-rings have been
provided. Dowel pins are used to locate end plates, housing, and
drive end cover in the proper location relative to each other. Be
sure they are in place.
It is recommended that the gear end rotor shaft bearings be
purchased from Tuthill Vacuum and Blower Systems, as they are
specially ground to locate the rotors with correct end clearance
relative to the gear end plate. Do not use standard bearings which
have not been flush ground within .001” (.025 mm) tolerance. Use
factory approved parts.
It is suggested that long feeler gauges (12” or 30 cm) be used to
check the interlobe timing, preferably (2) .006” (.15 mm), (1) .005”
(.13 mm), (1) .004” (.10 mm), and (1) .003 (.08 mm). This will give
you all the combinations from .003” (.08 mm) to .021” (.53 mm)
and also .024” (.61 mm) which is the total.
PREPARATION OF END PLATES FOR ASSEMBLY:
1. Remove all nicks, scratches, etc. from all sealing surfaces.
Clean all parts thoroughly. See seal pressing tool drawing
(T32018) on page 27.
2. Mechanical Seal Series - Press in new labyrinth seals [51]
into bores of both end plates [4] making sure the scalloped
areas of seal case are aligned with openings in vent area
of seal bore. Coat O.D. of mechanical seal with sealer
and press into seal bore, coming to rest on top of labyrinth
seal. Make sure seals are fully seated without deforming
case. Keep sealer from carbon surface. Carefully wipe
carbon with soft tissue and cleaning agent (acetone) before
continuing assembly. Slinger Seal Series - Press in new oil
slinger stators [79] if required.
GEAR END ASSEMBLY:
3. Stand rotors [1] on arbor press table with gear end shafts
up. See Figure 7. Two keyways should point in the same
Figure 6A - Keyways in line and timing marks matched
Figure 6B - Timing marks advanced 3 teeth
(Reference marks aligned)
Drive Gear Driven Gear
Figure 6A
Keyways in line and timing marks matched
Drive Gear Driven Gear
Figure 6B
Timing marks advanced 3 teeth
(Reference marks aligned)
Drive Gear Driven Gear
Figure 6A
Keyways in line and timing marks matched
Drive Gear Driven Gear
Figure 6B
Timing marks advanced 3 teeth
(Reference marks aligned)

10
direction, to the right.
4. Carefully install gear end plate over rotor shafts. NOTE: The drive rotor should always be on the left side. Make sure the end
plate feet are facing in the proper direction so the assembled unit will have the same drive shaft location as before.
5. Mechanical Seal Series - Some earlier models used an O-ring [314] under the mating portion of the mechanical seal. This has
been discontinued and O-rings should not be used with newly purchased seals. Check lapped surface of seal mating ring to be
sure it is perfectly clean. Use soft tissue and cleaning agent if necessary. Place a few drops of lubricating oil on its surface and
install on shaft with lapped surface coming to rest on top of carbon. Gently press with fingers to insure compression is taking
place and ring is not hung up for any reason.
Slinger Seal Series - Slide seal slinger [238] over shaft. Also install spacer [129] if two piece.
6. Lubricate shafts and press the double row ball bearings [9] onto rotor shafts and into end plate bores. CAUTION: These
bearings have been flush ground at the factory. The inner race will have a black dot etched on the surface. This dot must be up
and visible when bearings are installed. Secure with bearing retainers [14], and socket head screws [30].
7. Check clearance between the face of the end plate and rotor lobes. See Clearances table on page 16 for correct gear end
clearances. If clearances are not within specifications, recheck parts to find cause of improper clearances before proceeding.
INSTALLATION OF TIMING GEARS:
8. Install spacer [17] (.260” {6.60 mm} thickness) on one shaft, and spacer [18] (.200” {5.08 mm} thickness) and oil slinger [20]
on the other shaft. NOTE: Oil slinger and its spacer should always be mounted on lower rotor for horizontal flow units. It can
be mounted on either shaft for vertical flow units. Install timing shim in same location as found in disassembly. This does not
necessarily insure the unit will be in proper time. Adjustments can be made later in the assembly process.
9. Insert gear keys [24] in their proper location and flush with top of shaft. Use the two keyways facing to the right. A tight fit is
required. Coat shafts and keys with lubricant. Install drive gear (right hand helix) on drive rotor (left side). To install driven gear,
align reference marks as shown in Fig. 6B. Install driven gear carefully to avoid damaging any teeth when engaging opposite
gear. Secure with spacers [57], washers [25], and flat head Allen screws [29]. NOTE: All timing gears must be used in sets,
as they are matched and serially numbered.
10. Remove assembly from press and stand on work table with gears down. Place blocks under end plate to prevent assembly
from falling over. Drive gear should remain on left side.
HOUSING AND FREE END ASSEMBLY:
11. Place a small bead of sealer around the periphery of the end plate, encircling each bolt hole. Install rotor housing [3] and
secure with 4 screws evenly spaced.
12. Check clearance between end of lobes and housing using a flat bar and feeler gauges or a depth micrometer. Refer to
Clearances table on page 16 for free end clearances.
13. Place a small bead of sealer around the periphery of the housing, encircling each bolt hole. Install free end plate and secure
with 4 screws.
14. Mechanical Seals - Install mating rings same as gear end, No. 5. 92/93 - Install seal slinger same as gear end.
15. Install bearing spacers [123] on each shaft. Lubricate shafts and install roller bearings [10]. CAUTION: Inner race of bearing
has a flange on one side only. This flange must face outward. See Figure 10.
16. Install oil retainer rings [14] with button head screws [30]. Only two required for each ring.
ADJUSTING ROTOR INTERLOBE CLEARANCE:
17. Install spacer [67] on each shaft. Install oil slinger [21] on lower rotor, (either shaft on vertical flow units) spacer [57] on
opposite shaft, washers [25], and screws [29]. Lay assembly down with drive on left for timing.
18. Using feeler gauges take interlobe readings and record on each side of housing as indicated in Figure 8. By removing or
adding shim behind the helical gear, it rotates as it is moved in or out and the driven rotor turns with it, thus changing the
clearance between rotor lobes. Changing the shim thickness
.006” (.15 mm) will change the rotor lobe clearance .003”
(.08 mm) or one-half the amount.
EXAMPLE: Referring to Figure 8, check the clearance a
AA (right hand reading) and BB (left hand reading). If AA
reading is .009” (.23 mm) and BB reading .003” (.08 mm)
by removing .006” (.15 mm) shims, the readings will change
one-half the amount removed or .003” (.08 mm) AA should
then read .006” (.15 mm) and BB should read .006” (.15
mm). The final reading should be within .002” (.05 mm)
of each other. To determine the amount of shim to add or
remove, subtract the small figure from the larger. If the right
side reading is higher than the left side, remove shim. If the right side reading is lower, add shim.
19. Install drive shaft [45] and secure with Allen screws [66]. Check drive shaft runout behind keyway. Do not exceed .002” (.05
Figure 7 - Keyways
DRIVE Keywayed
Shaft
Facing
Up
Keyways
Facing
Same
Direction

11
mm) T.I.R. Install lockwire [49].
20. Install bearing [50] on drive shaft with shield towards gear, and shim pack [118].
21. Remove temporary cap screws from gear end plate and apply a bead of sealer around end plate (not cover), encircling all
holes, and install gear cover [6] and secure with cap screws [26A]. NOTE: If cooling coil or fittings were disturbed or water
was detected in drain oil, they should be retested with air pressure to check for leaks and resealed. This applies to mechanical
seal series only.
DRIVE SHAFT SEAL ASSEMBLY:
22. Grease and install O-ring [140] into groove of seal adapter housing [91]. Press in stator portion (carbon) of mechanical seal
[76].
23. Install O-ring spacer [74], O-ring [75], and mating ring portion of mechanical seal, with lapped surface facing outward. Make
sure surface is clean and place a few drops of lubricating oil on its surface. Install sleeve [77] with grooved side facing mating
ring.
24. Slide seal assembly housing [91] over drive shaft and against cover. Slide dust washer [82] against spacer sleeve [77]. Dust
washer should be flush to plus .005” (.13 mm) with face of housing. Adjust with shim pack [118].
25. Remove housing and install O-ring [92]. Reinstall housing [91], (with cut out on seal housing up when unit is standing on its
feet) dustwasher [82] and secure with Allen screws [93] and spanner nut [83]. CAUTION: Do not hammer on wrench or use
excessive force as distortion of mating ring may occur causing leakage.
COMPLETE BOOSTER ASSEMBLY:
26. Install free end cover [7] following the same procedure used to install the gear cover. Secure with cap screws [26B].
27. Apply sealer and install both port fittings [38 or 48].
28. Install all necessary cooling water lines.
29. Prior to putting booster into operation, follow Installation and Operation instructions. Observe the oil level frequently during the
initial hours of operation. An improperly installed or damaged oil seal will result in oil loss.
DISASSEMBLY — KMBD-540, 720, 850, 1600, 2000, 2700
NOTE: Items shown in brackets [ ] are referenced to item numbers shown on page 21 and 24.
1. Disconnect cooling water lines [274 & 181]. Do not disturb the large hex head screw [97]. If it is removed, loosened, or water is
detected in drain oil, the coil assembly must be retested as described in the assembly procedure.
2. Drain oil from both ends of booster and remove port fittings [38 or 48].
3. If you anticipate overhauling more than one unit of the same size, it will be to your advantage to machine a post to
disassemble and assemble the drive shaft seal assembly, separate from the unit. Dimensional drawings for this post are on
page 28 (T22179 used for models 540 and 720) or page 29 (T22180 used for models 850, 1200, 1600, 2000, and 2700).
Remove the four screws [93], loosen set screws [90], and slide the entire assembly off the shaft. Continue below for the
alternate method.
4. Remove spanner lock nut [83].
5. Loosen both set screws [90] and slide off lock ring [89].
6. Remove four socket head screws [93] and seal housing [91].
Two pry slots have been provided. Dust washer [82] will slide
off with housing.
7. Tap out seal [76] and remove O-rings [140 & 92].
8. Remove sleeve [77] and slide adapter sleeve [87] from shaft.
9. Remove seal mating ring [76], seal spacer [74], and O-rings
[75 & 88].
10. Remove cap screws [26] and gear cover [6]. Two jackscrew
holes are provided on both covers.
11. Using bearing puller, remove drive shaft bearing [9 or 50], or
press off after removing shaft. Retain bearing shim [86] for
reassembly.
12. Remove drive shaft screws [66] and locks [65]. Tap shaft
lightly to remove.
13. Remove gear lock nuts and washers [35 & 36]. Model 850,
1600, 2000, and 2700 series (top drive only). Remove cap screw [396] washers [136 & 80] and oil slinger [20] if furnished.
14. Position the timing gears for pulling by first matching the timing marks on the gears. See Figure 9A below. Turn the drive gear
clockwise five teeth and mark a matching reference line on each gear as shown in Figure 9B below. The rotor lobes are now
in their most open position. Using a gear puller, the driven gear (left hand helix) may now be removed without jamming the
rotors. This gear is in two parts - the gear rim and hub. It is not necessary to disassemble. Do not allow the gears to move from
the matched reference line while pulling. Use a light rocking motion while pulling the gear to insure that the lobes have not
jammed.
Figure 8 - Checking Rotor Interlobe Clearance

12
15. Remove drive gear. It is not necessary to remove keys from rotor shafts.
16. Remove cap screw [62], locks [61], and bearing lock rings [14].
17. Install two screws temporarily to hold end plate to housing. WARNING: Failure to properly pull this gear could result in
damage to rotor keyway or a bent rotor shaft. Never use excessive force.
18. Remove the free end cover [7], rotor shaft socket screws [26 & 69], washer [25], spacer [57], oil slinger [21] (must be pried off
on models KMBD-850, 1600, 2000, and 2700), roll or dowel pin [68], socket head screws [30] and oil retainer rings [14 or 15].
NOTE: On KMBD-540 and KMBD-720, it is not necessary to remove item 15 unless the end plate is being replaced. NOTE:
The flat head screws have nylok in their threads and may be difficult to remove. Strike the head a couple of blows with a flat
face hammer for easy removal.
19. Using two yoke style pullers with pressure screws attached to free end plate bores, pull end plate from housing. Dimensional
drawings for the pullers are on page 29 (T29603-1). Tap out the bearings [10]. Mechanical Seal Series - Tap out mechanical
seal [54], spacers [123], and labyrinth seal [51]. Slinger Seal Series - Tap out seal slinger [238] and spacers [123]. The oil
slinger stator [79] should not be removed unless it is damaged or the end plate is to be replaced. NOTE: On some older units
the oil seal slinger is made up of two separate parts - items 238 & 129. The newer design combines these two parts and is
identified as item 238.
20. Using a single yoke puller with longer screws, push out one rotor at a time making sure the rotor is vertical in the housing (for
support) while removing.
21. Remove the two temporarily installed screws and tap gear end plate from housing and remove bearings and seals.
22. Clean all parts with a good grade of clean solvent and replace any worn or damaged parts with factory approved parts. New
bearings, seals, and O-rings should be installed at each assembly.
ASSEMBLY — KMBD-540, 720, 850, 1600, 2000, 2700
GENERAL
The assembly procedure is generally the same for all series, but
where there are differences, notations will be made. All vacuum
joints, end covers, seal casings, and plugs should be sealed with
an RTV Silicone Sealer equal, unless O-rings have been provided.
Dowel pins are used to locate end plates, housing, and drive end
cover in the proper location relative to each other. Be sure they are
in place.
It is recommended that the gear end rotor shaft bearings be
purchased from Tuthill Vacuum & Blower Systems, as they are
specifically ground to locate the rotors with correct end clearance
relative to the gear end plate. Do not use standard bearings which
have not been flush ground within .001” (.025 mm) tolerance. Use
factory approved parts.
It is suggested that long feeler gauges (12” or 30 cm) be used to
check the interlobe timing. Preferably (2) .006” (.15 mm), (1) .005”
(.13 mm), (1) .004” (.10 mm), and (1) .003” (.08 mm). This will give
you all the combinations from .003” (.08 mm) to .021” (.53 mm) and
also .024” (.61 mm) which is the total.
PREPARATION OF END PLATES FOR ASSEMBLY
1. Remove all nicks, scratches, etc. from all sealing surfaces.
Clean all parts thoroughly. Dimensional drawings for seal
pressing tools are on page 27 (T11549 used for models 540
and 720) or page 28 (T11449 used for models 850, 1200,
1600, 2000, and 2700).
2. Mechanical Seal Series - Press in new labyrinth seals [51]
into bores of both end plates [4] making sure the scalloped
areas of seal case are aligned with openings in vent area of
seal bore. Coat O.D. of mechanical seal with sealer and press
into seal bore, coming to rest on top of labyrinth seal. Make
sure seals are fully seated without deforming case. Keep
Figure 9A - Keyways in line and timing marks matched
Figure 9B - Timing marks advanced 3 teeth
(Reference marks aligned)

13
sealer from carbon surface. Carefully wipe carbon with soft tissue and cleaning agent (acetone) before continuing assembly.
Slinger Seal Series - Press in new oil slinger stators [79] if required.
3. Stand rotors [1] on arbor press table with gear end shafts up. See Figure 10. Two keyways should point in the same direction,
to the right.
4. Carefully install gear end plate over rotor shafts. NOTE: The drive rotor should always be on the left side. Make sure the end
plate feet are facing in the proper direction so the assembled unit will have the same drive shaft location as before.
5. Mechanical Seal Series - Check lapped surface of seal mating ring to be sure it is perfectly clean. Use soft tissue and cleaning
agent if necessary. Place a few drops of lubricating oil on its surface and install on shaft with lapped surface coming to rest on
top of carbon. Gently press with fingers to insure compression is taking place and ring is not hung up for any reason. Slinger
Seal Series - Slide seal slinger [238] over shaft. Also install spacer [129] if two-piece.
GEAR END ASSEMBLY
6. Lubricate shafts and press the double row ball bearings [9] onto rotor shafts and into end plate bores. CAUTION: These
bearings have been flush ground at the factory. The inner race will have a black dot etched on the surface. This dot must be up
and visible when bearings are installed. Secure with bearing retainers [14] or [14 & 15] on KMBD 540 and KMBD-720, locks,
and cap screws [61 & 62].
7. Check clearance between the face of the end plate and rotor lobes. See Clearances table on page 16 for correct gear end
clearances. If clearances are not within specifications, recheck parts to find cause of improper clearances before proceeding
INSTALLATION OF TIMING GEARS
8. Insert gear keys [24] in their proper location. Use the two keyways facing to the right. A tight fit is required. Coat shafts and
keys with lubricant.
9. Install drive gear (right hand helix) on drive rotor (left side). To install driven gear, align reference marks as shown in Fig. 10B.
Install driven gear carefully to avoid damaging any teeth when engaging opposite gear. Secure with gear lockwasher [36] and
lock nut [35]. NOTE: All timing gears must be used in sets, as they are matched and serially numbered.
10. Remove assembly from press and stand on work table with gears down. Place blocks under end plate to prevent assembly
from falling over. Drive gear should remain on left side.
HOUSING AND FREE END ASSEMBLY
11. Place a small bead of sealer around the periphery of the end plate, encircling each bolt hole. Install rotor housing [3] and
secure with four screws evenly spaced.
12. Check clearance between the end of lobes and the housing using a flat bar and feeler gauges or a depth micrometer. Refer to
Clearances table on page 16 for free end clearances.
13. Place a small bead of sealer around the periphery of the housing, encircling each bolt hole. Install free end plate and secure
with four screws.
14. Mechanical Seal Series - Install mating rings in the same way as the gear end, No. 5.
Slinger Seal Series - Install seal slinger in the same way as the gear end.
15. Install bearing spacers [123] on each shaft. Lubricate shafts and install roller bearings [10]. CAUTION: Inner race of bearing
has a flange on one side only. This flange must face outward. See Figure 10.
16. Install oil retainer rings and screws [14 & 30], spacer [57] (Models 1600, 2000, 2700 only), washer [25], screw [29], oil slinger
and dowel [21 & 68], and screw [69]. NOTE: Oil slinger should always be mounted on lower rotor for horizontal flow units. It
can be mounted on either shaft for vertical flow units.
17. Lay booster assembly down and torque timing gear nuts at this time. See Torque table on page 16 for proper torques.
ADJUSTING ROTOR INTERLOBE CLEARANCE
18. The driven gear is made of two pieces. The outer gear shell is fastened to the inner hub with four cap screws and located with
two dowel pins. A laminated shim, made up of .003” (.08 mm) laminations, separates the hub and the shell. By removing or
adding shim laminations, the gear shell is moved axially relative to the inner hub. Being a helical gear, it rotates as it is moved
in or out and the driven rotor turns with it, thus changing the clearance between rotor lobes. Changing the shim thickness .006”
(.15 mm) will change the rotor lobe clearance .003” (.08 mm) or one half the amount.
19. EXAMPLE: Referring to Figure 11, check the clearance at AA (right hand reading) and BB (left hand reading). If AA reading
is .013” (.32 mm) and BB reading is .007” (.18 mm), by removing .006” (.15 mm) shims, the readings will change one half of
the amount removed or .003” (.08 mm). AA should then read .010” (.25 mm) and BB should read .010” (.25 mm). The final
readings should be within .002” (.05 mm) of each other.
To determine the amount of shim to add or remove, subtract the smaller figure from the larger. If the right side reading is higher
than the left side, remove shim. If the right side reading is lower, add shim. When removing gear shell from driven gear, it is
not necessary to remove gear lock nut. Make sure bolt locks are in place because the dowel pins must come off with the gear
shell.

14
20. Bend over lock tabs of gear lockwasher [36] and gear screw locks. KMBD-1600, 2000, and 2700 only - Mechanical Seal series
(top drive only). Reinstall oil slinger [20] to lower rotor and secure with washer [136 & 80] and cap screw [396], if furnished. Not
used on older models.
21. Press on drive shaft bearing [9 or 50] (bearing shield must face outward - Models KMBD-200, 400, 2000, 2700 only) and
install drive shaft with locks and screws [65 & 66], making sure both surfaces are clean and free of all burrs. Drive shaft runout
should not exceed .003” (.08 mm) T.I.R. measured behind keyway. Bend over lock tabs.
22. Remove temporary cap screws from end plate and apply a bead of sealer around end plate (not cover), encircling all holes,
and install gear cover [6] and secure with cap screws [26]. NOTE: If cooling coils or manifold screws have been disturbed, they
should be retested with air pressure to check for leaks. If leaks occur, disassemble and replace O-rings [9 & 96]. Mechanical
Seal series only.
DRIVE SHAFT SEAL ASSEMBLY
23. Install shim pack [86] on shaft. Install O-ring [140] in bottom of seal housing bore [91]. Press stator portion of mechanical seal
[54 or 76] into bore until fully seated. Do not distort. Clean carbon surface with soft tissue and acetone.
24. The drive shaft seal assembly can be assembled using the fixture shown on page 28 (T22179 used for models 540 and 720)
or page 29 (T22180 used for models 850, 1200, 1600, 2000, and 2700)
a. Slide threaded sleeve [87] on shaft or post. Install O-ring spacer [74].
b. Lubricate O-ring [75] and install in spacer groove. Make sure O-ring is fully seated in groove so it will not be pinched.
c. Clean mating ring [54] and place a few drops of lubricating oil on the lapped surface. Install with this surface out.
d. Install sleeve spacer [77] with groove side against mating ring.
e. Carefully install seal housing [91] over sleeve and temporarily secure with two screws.
f. Install dust washer [82], and lock ring [89] with two set screws [90]. One set of screws will pass through hole in sleeve and
be positioned in keyway. Turn the other set of screws until it bottoms against sleeve. Do not tighten at this time.
g. Install spanner nut [83] with chamfer in, using spanner wrench.
CAUTION: Do not hammer on wrench or use
excessive force. Distortion of mating ring may occur causing
leak.
25. Mount assembly on shaft or proceed as follows: To set
proper seal compression, apply thumb pressure to hold
sleeve assembly against laminated shim. Using a depth
micrometer, measure the difference between the seal dust
washer and the face of the seal housing. Note this amount.
The dust washer should be flush or .005” (.13 mm) below
the housing. Add or remove the proper amount of shim to
obtain this setting.
26. Remove assembly, lubricate and install the large O-ring [92]
around the housing bore and the small O-ring [88] inside
the sleeve bore. Check end of shaft and keyway. Remove
all sharp edges so O-ring will not be cut when assembly is
installed.
27. Install assembly with cut out on seal housing up when unit
is standing on its feet. Brass elbow [152] should also be in
place at this time. Secure with four screws [93]. Tighten both
sets of screws [90].
28. Install free end cover [7] following the same procedure used
to install the gear cover.
COMPLETE BOOSTER ASSEMBLY
29. Apply sealer and install both port fittings (38 & 48).
30. Install all necessary cooling water lines.
31. Prior to putting booster into operation, follow Installation
and Operation instructions. Observe the oil level frequently
during the initial hours of operation. An improperly installed
or damaged oil seal will result in oil loss.
FREQUENTLY ASKED QUESTIONS
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
Figure 10 - Roller Bearing Flange
Figure 11 - Rotor Interlobe Clearance

15
is increased causing them to run hotter. Since it is thicker, it will not flow 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 blower (environment, run time, speed, and pressure) has a direct effect on duty cycles. Our published cycles are
based on worst-case conditions.

16
CLEARANCES
Values shown in inches and millimeters.
MODEL GEAR END FREE END INTERLOBE TIP-DOWEL TIP-PORT
240C
.003 - .005
.08 - .13
.006 - .010
.15 - .25
CENTER
TIMED N/A .0065-.0075 .165 - .190
400
.012 - .017
.30 - .43
400C
400BP
540
.004 - .007
.10 - .18
.011 - .016
.28 - .41
CENTER
TIMED N/A .006 - .011 .15 - .28
720
720C
720BP
850
.004 - .007
.10 - .18
.011 - .016
.28 - .41
CENTER
TIMED
.007 - .012
.18 - .30
.011-.016
.28-.41
1600 & C-face .017 - .022
.43 - .56
2000 & C-face .021 - .026
.53 - .66
2700 .025 - .030
.64 - .76
.008 - .013
.20 - .33
.012-.017
.30 - .43
TORQUE CHART
Values shown in foot-pounds (ft.-lbs) and Newton-meters (N-m).
PART DESCRIPTION
200
400
540
720
850
1600
2000
2700
ROTOR SHAFT FLAT HEAD SCREW 35
47
35
47
90
122
1/4” CAP SCREW 10
13 — —
5/16” CAP SCREW 17
23
21
28 —
3/8” CAP SCREW — 42
56
42
56
1/2” CAP SCREW — — 90
122
TIMING GEAR SHAFT NUT — 110
149
140
190
GEAR END BEARING RETAINER CAP SCREW — 23
31
23
31
DRIVE SHAFT FLAT HEAD SCREW — 35
47
35
47
BEARING RETAINER BUTTON HEAD SCREW 3
4— —

17
PUMP MODEL KMBD-400BP KMBD-720BP
Displacement CFM 400 720
Inlet/Outlet NPT 2 2
Motor HP 3 5
Bypass valve 2 1-1/2
Valve item # 520356 B000 520357 B000
Tubing item # 520366 B000 520365 B000
Cracking pressure 50 Torr 50 Torr
Max. Pressure Diff. 75 Torr 75 Torr
These models are designed for applications such as vacuum packaging, where there is rapid cycling of evacuation of small volumes.
They are similar to standard slinger seal models except that smaller suction and discharge connections are used and a bypass valve
is fitted.
The smaller port sizes minimize the volume of the piping and results in the fastest possible evacuation of small volumes.
The purpose of the valve is to protect the booster from temporary fault conditions. The valve limits the pressure rise across the
booster and thus shaft power and gas temperature rise.
To remove the valve loosen the two screws on the tube clamp below the valve and slide it clear of the gap in the bypass tube.
Unscrew the valve from the top fittings.
Inspect the valve for contamination by process particulates or deposits. Disk (item 5), should move freely in guide (item 9). Mark the
location of the cap before dismantling. It must be in the same position when the valve is reassembled. The caps (item 9), position
sets the spring compression, and thus the valve cracking pressure.
BYPASS MODELS  KMBD400BP & KMBD720BP
NOTES:

18
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
1 Rotor 2 2
3 Housing 1 1
4 End Plate 2 2
6 Drive End Cover 1 1
7 Free End Cover 1 1
8 Timing Gear Set 1 1
9 Bearing 2 2
10 Bearing 2 2
14 Bearing Retainer 4 4
16 Timing Gear Shim 1 1
17 Spacer 1 1
18 Spacer 1 1
19 Shims 2 2
20 Oil Slinger 1 1
21 Oil Slinger Assembly 1 1
22 Dowel Pins 6 6
23 Drive Shaft Key 1 1
24 Gear Key 2 2
25 Rotor Shaft Washer 4 4
26A Cap Screw 12 12
26B Cap SCrew 12 12
29 Flat Socket Screw 4 4
30 Socket Screw 12 12
31 Magnetic Pipe Plug 2 2
38 Port Fitting 1-0 1-0
40 Hex Head Cap Screw AR AR
45 Drive Shaft 1 1
48 Port FItting 1 1
49 Lock Wire 1 1
50 Bearing 1 1
51 Labyrinth Seal 4 —
54 Mechanical Seal 4 —
57 Spacer 3 3
66 Screw 2 2
67 Spacer 2 2
74 Spacer 1 1
75 O-Ring 1 1
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
76 Mechanical Seal 1 1
77 Spacer 1 1
79 Oil Retainer — 4
82 Washer 1 1
83 Locknut 1 1
85 Pipe Plug AR AR
91 Seal Adapter Housing 1 1
92 O-ring 1 1
93 Screw 4 4
94 Cooling Coils 2 —
98 Pipe Plug AR AR
118 Shim 1 1
120 Bushing 4 —
121 Pipe Plug 2 2
123 Bearing Spacer 2 2
127 Socket Screw — 2
129 * Sleeve — 4
137 Oil Deector — 1
140 O-ring 1 1
152 Elbow 1 —
165 Connector 4 —
166 Connector 3 —
174 Pipe Plug 2 2
180 Elbow AR —
181 Hose 1 —
238* Slinger — 4
241 Socket Screw 12 12
242 Sight Glass Frame 2 2
243 Sight Glass Window 2 2
244 Window Gasket 2 2
245 Frame Gasket 2 2
271 Pipe Plug AR —
272 Elbow AR —
273 Hose End 1 —
274 Hose 1 —
* Items 129 and 238 are now manufactured as a single part. Use item
number 238 to order.
Parts kits are available, consult factory.
KMBD200 AND KMBD300 PARTS LIST

19
KMBD540 AND KMBD720 PARTS LIST
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
1 Rotor 2 2
3 Housing 1 1
4 End Plate 2 2
6 Drive End Cover 1 1
7 Free End Cover 1 1
8 Timing Gear Set 1 1
9 Bearing 3 3
10 Bearing 2 2
14 Bearing Retainer 2 2
15 Oil Retainer Ring 4 4
16 Timing Gear Shim 1 1
21 Oil Slinger Assembly 1 1
22 Dowel Pins 6 6
23 Drive Shaft Key 1 1
24 Gear Key 2 2
25 Rotor Shaft Washer 4 4
26 Cap Screw 28 28
29 Flat Socket Screw 1 1
30 Socket Screw 4 4
31 Magnetic Pipe Plug 2 2
35 Gear Locknut 2 2
36 Gear Lockwasher 2 2
38 Port Fitting 2 2
40 Hex Head Cap Screw AR AR
45 Drive Shaft 1 1
51 Labyrinth Seal 4 —
54 Mechanical Seal 4 —
61 Lockplate 2 2
62 Cap Screw 8 8
65 Lockplate 2 2
66 Screw 4 4
68 Oil Slinger Pin 1 1
69 Flat Socket Screw 1 1
74 Spacer 1 1
75 O-Ring 1 1
76 Mechanical Seal 1 1
77 Spacer 1 1
79 Oil Retainer — 4
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
82 Washer 1 1
83 Locknut 1 1
85 Pipe Plug AR AR
86 Shim 1 1
87 Sleeve 1 1
88 O-ring 1 1
89 Spacer 1 1
90 Screw 2 2
91 Seal Adapter Housing 1 1
92 O-ring 1 1
93 Screw 4 4
94 Cooling Coils 2 —
95 O-ring 1 1
96 O-ring 4 —
97 Manifold Screw 4 —
98 Pipe Plug AR AR
121 Pipe Plug 2 2
123 Bearing Spacer 2 2
127 Socket Screw — 2
137 Oil Deector — 1
140 O-ring 1 1
152 Elbow 1 —
166 Connector 3 —
174 Pipe Plug 2 2
180 Elbow AR —
181 Hose 1 —
238 Slinger — 4
241 Socket Screw 12 12
242 Sight Glass Frame 2 2
243 Sight Glass Window 2 2
244 Window Gasket 2 2
245 Frame Gasket 2 2
271 Pipe Plug 1-0 —
272 Elbow 1-0 —
273 Hose End 1 —
274 Hose 1 —
Parts kits are available, consult factory.

20
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
1 Rotor 2 2
3 Housing 1 1
4 End Plate 2 2
6 Drive End Cover 1 1
7 Free End Cover 1 1
8 Timing Gear Set 1 1
9 Bearing 2 2
10 Bearing 2 2
14 Bearing Retainer 4 4
16 Timing Gear Shim 1 1
21 Oil Slinger Assembly 1 1
22 Dowel Pins 6 6
23 Drive Shaft Key 1 1
24 Gear Key 2 2
25 Rotor Shaft Washer 1 1
26 Cap Screw 28 28
29 Flat Socket Screw 1 1
30 Socket Screw 6 6
31 Magnetic Pipe Plug 2 2
35 Gear Locknut 2 2
38 Port Fitting 1-2 1-2
40 Hex Head Cap Screw AR AR
45 Drive Shaft 1 1
48 Port Fitting 1-0 1-0
50 Bearing 1 1
51 Labyrinth Seal 4 —
54 Mechanical Seal 5 —
57 Spacer 1 1
61 Lockplate 6 6
62 Cap Screw 12 12
65 Lockplate 6 6
66 Screw 4 4
68 Oil Slinger Pin 1 1
69 Flat Socket Screw 1 1
74 Spacer 1 1
75 O-Ring 1 1
76 Mechanical Seal — 1
77 Spacer 1 1
79 Oil Retainer — 4
80 Washer 0-1 0-1
KMBD850, 1600, 2000, AND 2700 PARTS LIST
ITEM
NO. PART DESCRIPTION MECHANICAL SEAL
SLINGER
SEAL
82 Washer 1 1
83 Locknut 1 1
85 Pipe Plug AR AR
86 Shim 1 1
87 Sleeve 1 1
88 O-ring 1 1
89 Spacer 1 1
90 Screw 2 2
91 Seal Adapter Housing 1 1
92 O-ring 1 1
93 Screw 4 4
94 Cooling Coils 2 —
95 O-ring 4 —
96 O-ring 4 —
97 Manifold Screw 4 —
98 Pipe Plug AR AR
123 Bearing Spacer 2 2
129* Sleeve — 4
140 O-ring 1 1
152 Elbow 1 —
166 Connector 3 —
174 Pipe Plug AR AR
180 Elbow AR —
181 Hose 1 —
238* Slinger — 4
241 Socket Screw 12 12
242 Sight Glass Frame 2 2
243 Sight Glass Window 2 2
244 Window Gasket 2 2
245 Frame Gasket 2 2
271 Pipe Plug AR —
272 Elbow AR 2
273 Hose End 1 —
274 Hose 1 —
500 Thermoswitch 1 1
* Items 129 and 238 are now manufactured as a single part. Use item
number 238 to 28 order.
Parts kits are available, consult factory.