Gardner Denver HELIFLOW HYCL BA Service manual

PARTS LIST
OPERATING AND
SERVICE MANUAL
INDUSTRIAL
SERIES
BLOWERS
4”GEAR DIAMETER
Models
HYCL_BA
HYCM_BA
HF
-
7
-
600
Version 09
August 29, 2018
HELIFLOW

HF-7-600 Page i
MAINTAIN BLOWER RELIABILITY AND PERFORMANCE
WITH GENUINE GARDNER DENVER
PARTS AND SUPPORT SERVICES
Factory genuine parts, manufactured to design tolerances, are developed for optimum dependability - - -
specifically for your blower. Design and material innovations are born from years of experience with
hundreds of different blower applications. When you specify factory genuine parts you are assured of
receiving parts that incorporate the most current design advancements manufactured in our state-of-the-
art blower factory under exacting quality standards.
Your AUTHORIZED DISTRIBUTOR offers all the backup you require. A worldwide network of authorized
distributors provides the finest product support in the blower industry.
Your AUTHORIZED DISTRIBUTOR can support your blower investment with these services:
1. Trained parts technical representatives to assist you in selecting the correct replacement
parts.
2. Complete inventory of new machines and new, genuine factory parts.
3. A full line of factory tested AEON™PD blower lubricants specifically formulated for optimum
performance in all blowers.
4. Authorized distributor service technicians are factory-trained and skilled in blower
maintenance and repair. They are ready to respond and assist you by providing fast, expert
maintenance and repair service.
INSTRUCTIONS FOR DETERMINING BLOWER CONFIGURATION
1. Face the blower drive shaft.
2. In a VERTICAL configuration, air flow is horizontal.
3. In a HORIZONTAL configuration, air flow is vertical.
4. In a vertical configuration, a BOTTOM HAND exists when the drive shaft is below the
horizontal center line of the blower. A TOP HAND exits when the drive shaft is above the
horizontal center line of the blower.
5. In a horizontal configuration, a RIGHT HAND exists when the drive shaft is to the right of the
vertical center line of the blower. A LEFT HAND exists when the drive shaft is to the left of
the vertical center line of the blower.
INSTRUCTIONS FOR ORDERING REPAIR PARTS
For pricing, and ordering information contact your nearest AUTHORIZED FACTORY DISTRIBUTOR.
When ordering parts, specify Blower MODEL and SERIAL NUMBER (see nameplate on unit).
Rely upon the knowledge and experience of you AUTHORIZED DISTRIBUTOR and let them assist you in
making the proper parts selection for your blower.
To Contact Gardner Denver or locate your local distributor:
visit: www.contactgd.com/blowers
or
call: [phone]

HF-7-600 Page ii
FOREWORD
Gardner Denverâblowers are the result of advanced engineering and skilled manufacturing. To be
assured of receiving maximum service from this machine, the owner must exercise care in its operation
and maintenance. This book is written to give the operator and maintenance department essential
information for day-to-day operation, maintenance and adjustment. Careful adherence to these
instructions will result in economical operation and minimum downtime.
Danger is used to indicate the presence of a hazard which will cause severe personal injury,
death, or substantial property damage if the warning is ignored.
Warning is used to indicate the presence of a hazard which can cause severe personal injury,
death, or substantial property damage if the warning is ignored.
Caution is used to indicate the presence of a hazard which will or can cause minor personal
injury or property damage if the warning is ignored.
NOTICE
Notice is used to notify people of installation, operation or maintenance information which is
important but not hazard-related.

HF-7-600 Page iii
SAFETY PRECAUTIONS
Safety is everybody’s business and is based on your use of good common sense. All situations or circumstances
cannot always be predicted and covered by established rules. Therefore, use your past experience, watch out for
safety hazards and be cautious. Some general safety precautions are given below:
Failure to observe these notices could result in injury to or death of personnel.
·Keep fingers and clothing away from blower inlet and discharge ports, revolving belts,
sheaves, drive coupling, etc.
·Do not use the air discharge from this unit for breathing –not suitable for human
consumption.
·Do not loosen or remove the oil filler plug, drain plugs, covers the thermostatic mixing
valve or break any connections, etc., in the compressor air or oil system until the unit is
shut down and the air pressure has been relieved.
·Electrical shock can and may be fatal.
·Blower unit must be grounded in accordance with the National Electrical Code. A
ground jumper equal to the size of the equipment ground conductor must be used to
connect the blower motor base to the unit base.
·Open main disconnect switch, tag and lockout before working on the control.
·Disconnect the blower from its power source, tag and lockout before working on the
unit –this machine is automatically controlled and may start at any time.
Failure to observe these notices could result in damage to equipment.
·Stop the unit if any repairs or adjustments on or around the blower are required.
·Disconnect the blower from its power source, tag and lockout before working on the
unit –this machine is automatically controlled and may start at any time.
·Do not exceed the rated maximum speed values shown on the nameplate.
·Do not operate unit if safety devices are not operating properly. Check periodically.
Never bypass safety devices.

HF-7-600 Page iv
TABLE OF CONTENTS
Maintain Blower Reliability And Performance............................................................................................i
Instructions For Determining Blower Configuration....................................................................................i
Instructions For Ordering Repair Parts......................................................................................................i
Foreword................................................................................................................................................. ii
Safety Precautions ..................................................................................................................................iii
Matrix/Menu ........................................................................................................................................... vi
Introduction Your Key To Trouble Free Service........................................................................................1
Section 1, Equipment Check....................................................................................................................2
Section 2, Installation...............................................................................................................................4
Section 3, Maintenance...........................................................................................................................8
Section 4, Operation..............................................................................................................................12
Section 5, Special Tools Required.........................................................................................................15
Section 6, Disassembly Instructions.......................................................................................................19
Section 7, Assembly Instructions ...........................................................................................................21
Section 8, Parts List...............................................................................................................................29
Warranty ...............................................................................................................................................31

HF-7-600 Page v
INDEX
Air Filters And Filter Silencers ................................11
Assembly Instructions, Section 7............................21
Blower Startup Checklist........................................13
Disassembly Instructions, Section 6 .......................19
Disassembly Instructions........................................19
Drive Installation......................................................5
Equipment Check, Section 1
Equipment Check..................................................... 2
Filling Procedure......................................................8
Foundations.............................................................4
Installation, Section 2
Installaion ................................................................. 4
Introduction Your Key To Trouble Free Service.........1
Limitations.............................................................12
Location ..................................................................4
Lubrication Service..................................................8
Maintenance, Section 3
Maintenance............................................................. 8
Maintenance, Section 3............................................8
Matrix/Menu...........................................................Vi
Mounting Configurations..........................................4
Operation, Section 4
Operation.................................................................12
Parts List, Section 8...............................................29
Piping .....................................................................7
Recommended Lubricant.........................................8
Removing Protective Materials.................................3
Safety Precautions................................................. Iii
Safety Precautions................................................14
Section 7
Assembly Instructions.............................................21
Special Tools Required Section 5 ..........................15
Special Tools Required, Section 5
Special Tools Required...........................................15
Storage...................................................................2
Trouble Shooting...................................................14
Warranty...............................................................31
LIST OF ILLUSTRATION
FIGURE 2-1 –BLOWER MOUNTING CONFIGURATIONS......................................................................................4
FIGURE 2-2 –BELT DRIVE OVERHUNG LOAD CALCULATIONS..........................................................................6
FIGURE 3-1 - LUBRICATION.............................................................................................................................8
FIGURE 3-2 –APPROXIMATE OIL CAPACITIES (PINTS) ............................................................................8
FIGURE 3-3 –SYNTHETIC LUBRICANT CHART.........................................................................................10
FIGURE 4-1 –MAXIMUM OPERATING LIMITATIONS..........................................................................................12
FIGURE 5-1 - SEAL PROTECTION SLEEVE........................................................................................................ 15
FIGURE 5-2 –BEARING DRIVER......................................................................................................................... 15
FIGURE 5-3 –FALSE BEARING........................................................................................................................... 16
FIGURE 5-4 –INSERT DRIVER ........................................................................................................................... 16
FIGURE 5-5 –ASSEMBLY GUIDE FOR RINGS....................................................................................................17
FIGURE 5-6 –SLINGER/CARRIER DRIVER......................................................................................................... 17
FIGURE 5-7 –SEAL DRIVER...............................................................................................................................18
FIGURE 5-8 –NUT DRIVER.................................................................................................................................18
FIGURE 7-1 –INSTALL PISTON RINGS............................................................................................................... 21
FIGURE 7-2 –MEASURE STEP IN FALSE BEARING........................................................................................... 22
FIGURE 7-3 –PRESS BEARING ONTO ROTOR SHAFT......................................................................................23
FIGURE 7-4 –INSTALL BEARING RETAINING SCREWS.................................................................................... 23
FIGURE 7- 5 –INSTALL ROLLER BEARING........................................................................................................24
FIGURE 7-6 –TIGHTEN GEAR LOCKING SCREWS............................................................................................ 25
FIGURE 7-7 –TIGHTEN SETSCREWS................................................................................................................ 27
FIGURE 7-8 –MEASURE GEAR BACKLASH.......................................................................................................27

HF-7-600 Page vi
GARDNER DENVER HELIFLOW INDUSTRIAL SERIES BLOWERS
MATRIX/MENU
NOTICE TO CUSTOMER –To find the construction options for
Your blower unit, FILL IN THE BALANCE OF LETTERS OR H Y C A A
NUMBERS FROM YOUR UNIT NAMEPLATE ___ ___ ___ ___ ___ ___ ___
COLUMN NUMBER: 1 2 3 4 5 6 7
FOLLOW THE LINE DOWN AND OVER FROM EACH SPACE THUS FILLED
IN TO FIND THE APPROPRIATE CONSTRUCTION OPTION WITH WHICH
YOUR MACHINE IS EQUIPPED.
COLUMN 1 –BASIC DESIGNATOR
COLUMN 2 –PRODUCT FAMILY
COLUMN 3 –GEAR DIAMETER
A. F.
B. G.
C. 4”H.
E.
COLUMN 4 –CASE LENGTH
L. 8”(HF 408)
M. 6”(HF 406)
COLUMN 5 –CONFIGURATION
E. Std Blower –Vertical-Bottom Hand-Right Discharged Timed, CCW
F. Std Blower –Vertical-Bottom Hand-Left Discharge Timed, CW
G. Std Blower –Vertical-Top Hand-Right Discharge Timed, CW
H. Std Blower –Vertical-Top Hand-Left Discharge Timed, CCW
J. Std Blower –Horizontal-Right Hand-Bottom Discharge Timed CW
K. Std Blower –Horizontal-Right Hand-Top Discharge Timed CCW
L. Std Blower –Horizontal-Left Hand-Top Discharge Timed CW
M. Std Blower –Horizontal-Left Hand-Bottom Discharge Timed CCW
COLUMN 6 –DESIGN VERSION
COLUMN 7 –ADDITIONAL DESCRIPTION
A. Lip Seal

HF-7-600 Page 1
INTRODUCTION
YOUR KEY TO TROUBLE FREE SERVICE
Thank your for investing in Gardner Denver quality. The Gardner Denver reputation for rugged
dependability has been earned by over 50 years of service in demanding, industrial operations where
downtime cannot be tolerated and efficient blower performance is expected.
Your Gardner Denver blower is a precision engineered blower that has been carefully manufactured and
thoroughly tested at the state-of the-art Gardner Denver Blower Factory in Sedalia, Missouri.
As with other precision machinery, there are several relatively simple installation, operation and
maintenance procedures that you must observe to assure optimum blower performance. There is no
guesswork in the manufacture of your highly advanced Gardner Denver blower and there must be none in
preparing the blower to get the job done in the field.
The purpose of this manual is to help you properly install, operate and maintain your Gardner Denver
blower. It is essential that you review all sections of this manual in preparation for installing your blower.
Follow the instructions carefully and you will be rewarded with trouble-free Gardner Denver service…year
in and year out.
IMPORTANT GARDNER DENVER TELEPHONE NUMBERS
YOUR AUTHORIZED GARDNER DENVER DISTRIBUTION
NAME: ____________________________
TELEPHONE: ____________________________
FAX: ____________________________
CONTACT: ____________________________
THANKS…FOR THE PRIVIEDGE OF SERVING YOU WITH DEPENDABLE GARDNER DENVER QUALITY.

HF-7-600 Page 2
SECTION 1
EQUIPMENT CHECK
Before uncrating, check the packing slip carefully to be sure all the parts have been received. All
accessories are listed as separate items on the packing slip, and small important accessories such as
relief valves can be overlooked or lost. After every item on the packing slip has been checked off,
uncrate carefully. Register a claim with the carrier for lost or damaged equipment.
Customers are cautioned to provide adequate protection, warning and safety equipment
necessary to protect personnel against hazards involved in installation and operation of this
equipment in the system or facility.
STORAGE
Your Gardner Denver Blower was packaged at the factory with adequate protection to permit normal
storage for up to six (6) months.
If the unit is to be stored under adverse conditions or for extended periods of time, the following additional
measures should be taken to prevent damage.
1. Store the blower in a clean, dry, heated (if possible) area.
2. Make certain inlet and discharge air ports are tightly covered to prevent foreign material from
entering the air box.
3. All exposed, non-painted surfaces should be protected against rust and corrosion.
4. Provide adequate protection to avoid accidental mechanical damage.
5. In high humidity or corrosive environments, additional measures may be required to prevent
rusting of the blower internal surfaces.
6. To prevent rusting of gears, bearings, etc., the oil reservoirs may be filled with normal
operating oil.
Before running the blower, drain the oil and replace to the proper operating level with clean,
fresh lubricant.
7. Rotate the blower shaft (10 to 25 turns) monthly during storage. Inspect the blower shaft
(near the shaft seal area) monthly and spray with rust inhibitor if needed.
8. For long term storage (over six (6) months), contact Gardner Denver Customer Service for
recommendations.

HF-7-600 Page 3
REMOVING PROTECTIVE MATERIALS
The shaft extension is protected with rust inhibitor which can be removed with any standard solvent.
Follow the safety directions of the solvent manufacturer.
Blower inlet and outlet are temporarily capped to keep out dirt and other contaminants during shipment.
These covers must be removed before start-up.
The internal surfaces of all HeliFlow blowers are mist sprayed with a rust preventative to protect the
machine during shipment. Remove this film upon initial startup, using any commercial safety solvent.
Position the blower so that the inlet and discharge connections are in the vertical position (vertical
airflow). On vertically mounted units, it will be necessary to lay the unit on its side supporting the ends of
the unit so as not to restrict the portion on the bottom side. Place a shallow pan on the under side of the
unit. With the blower disconnected from power, spray the solvent in the top port, rotating the impellers by
spinning the shaft manually. Continue this procedure until the unit is visibly clean.
Rotating components will cause severe injury in case of personal contact. Keep hands away
from blower inlet and discharge ports.

HF-7-600 Page 4
SECTION 2
INSTALLATION
LOCATION
If possible, install the blower in a well lit, clean, dry place with plenty of room for inspection and
maintenance.
FOUNDATIONS
For permanent installations we recommend concrete foundations be provided, and the equipment should
be grouted to the concrete. It is necessary that a suitable base be used, such as a steel combination
base under blower and motor, or a separate sole plate under each. Before grouting, equipment must be
leveled, free of all strains, and anchored so no movement will occur during setting of grout. After grout
has completely hardened, a recheck is necessary to compensate for shrinkage, etc. If required, add
shims under blower feet after final tightening of foundation anchor bolts to remove strain from the blower
housing. Where jack screws or wedges are used during grouting, they must be backed off or removed
before final tightening of anchor bolts.
Where a concrete foundation is not feasible, care must be taken to insure that equipment is firmly
anchored to adequate structural members.
MOUNTING CONFIGURATIONS
The blower flex-mounting design enables horizontal and vertical mounting configurations with top or
bottom hand, right or left hand shaft positioning. The units are discharge timed allowing rotation in only
one direction (refer to FIGURE 2-1).
FIGURE 2-1–BLOWER MOUNTING CONFIGURATIONS

HF-7-600 Page 5
NOTICE
When changing mounting configuration, it will be necessary to reposition oil level gauge (H),
and drain plug (A). Refer to FIGURE 3-1, page 8, for correct location.
DRIVE INSTALLATION
When selecting a V-belt drive, check to be sure the shaft overhung load limitation is not exceeded. Refer
to FIGURE 2-2, page 6, for overhung load calculations and limitations.
Belt drives must be carefully aligned. Motor and blower pulleys must be parallel to each other and in the
same plane within 1/32 inch. Belt tension should be carefully adjusted to the belt manufacturer’s
recommendation using a belt tension gauge. Check tension frequently during the first day of operation.
Overtightening belts leads to heavy bearing loads and premature failure.
On the direct connected units, alignment and lubrication of couplings to specifications of the coupling
manufacturer is very important. When mounted drives are supplied from the factory, proper alignment
has been established before shipment. However, during shipping, handling and installation, it is likely
that the alignment has been disturbed and final adjustment must be made before startup.
Exceeding overhung load limitations leads to unwarrantable premature bearing failure and shaft
breakage.
The location of the sheave on the blower shaft greatly affects the stress in the shaft. The optimum blower
sheave positioning is as close as possible to the blower drive cover, not to exceed dimension “C”in Drive
Shaft Illustration, FIGURE 2-2, page 6.
The calculated shaft moment must not exceed the maximum allowable moment listed in Maximum
Allowable Moment Chart, FIGURE 2-2, page 6. If the calculated shaft moment exceeds the maximum
allowable moment:
•Increase Sheave Diameters to Reduce Belt Pull
•Use Jackshaft Drive
•Use Direct Coupled or Gearbox Drive
To calculate shaft moment for a given V-Belt Drive Arrangement:
1. Use the formula for Calculation of Belt Pull, FIGURE 2-2, page 6, to calculate belt pull. Refer
to Arc of Contact Factor Chart, FIGURE 2-2, page 6.
2. Insert the calculated belt pull into the formula for Calculation of Shaft Moment,
FIGURE 2-2, page 6 to arrive at the calculated shaft moment.

HF-7-600 Page 6
Gear
Diameter
(Inches)
Dimensions
(Inches)
Maximum
Allowable
Moment
(LB-IN)
A B C
(Max)
4 4.30 1.46 0.38 1450
MAXIMUM ALLOWABLE MOMENT
DRIVE SHAFT ILLUSTRATION
Z Ac Z Ac Z Ac Z Ac Z Ac Z Ac
0.000 1.000 0.250 0.966 0.500 0.926 0.750 0.879 1.000 0.823 1.250 0.751
0.025 0.997 0.275 0.962 0.525 0.922 0.775 0.874 1.025 0.816 1.275 0.742
0.050 0.994 0.300 0.958 0.550 0.917 0.800 0.869 1.050 0.810 1.300 0.734
0.075 0.990 0.325 0.954 0.575 0.913 0.825 0.864 1.075 0.803 1.325 0.725
0.100 0.987 0.350 0.951 0.600 0.908 0.850 0.858 1.100 0.796 1.350 0.716
0.125 0.983 0.375 0.947 0.625 0.904 0.875 0.852 1.125 0.789 1.375 0.706
0.150 0.980 0.400 0.943 0.650 0.899 0.900 0.847 1.150 0.782 1.400 0.697
0.175 0.977 0.425 0.939 0.675 0.894 0.925 0.841 1.175 0.774 1.425 0.687
0.200 0.973 0.450 0.935 0.700 0.889 0.950 0.835 1.200 0.767
0.225 0.969 0.475 0.930 0.725 0.884 0.975 0.829 1.225 0.759
ARC OF CONTACT FACTORS
Belt Pull = 2.5 –Ac 125954 x Hp x S.F.
Ac D x RPM
Key: Ac = Arc of Contact Factor (Refer to Arc of Contact Factor Chart above)
Hp = Blower Horsepower for Operating Conditions
S.F. = Actual Drive Service Factor
D = Blower Sheave Pitch Diameter in Inches
RPM = Blower Sheave Speed
Z = Large Sheave Pitch Diameter (in) –Small Sheave Pitch Diameter (in)
Sheave Center Distance (in)
CALCULATION OF BELT PULL
Shaft Moment (LB-IN) = Belt Pull x B + C + Sheave Width
2
CALCULATION OF SHAFT MOMENT
FIGURE 2-2 –BELT DRIVE OVERHUNG LOAD CALCULATIONS

HF-7-600 Page 7
PIPING
Inlet and discharge connections on all blowers are large enough to handle maximum volume with
minimum friction loss. Reducing the pipe diameter on either inlet or discharge will only create additional
line loss and increase the overall pressure differential.
Excessive weight of piping and fittings will cause internal misalignment and premature wear. Never allow
the blower to carry the weight of the pipe. If possible, a spool or sleeve-type expansion joint should be
installed between the unit and the piping. Where a flexible connection is not practical, the weight of the
rigid connection must be separately supported. All system piping must be cleaned internally before
connecting to the blower.
Gardner Denver blowers are shipped dry from the factory. Do not attempt to operate the blower
before following proper lubrication instructions. Permanent damage to the gears, bearings and
seals will occur.

HF-7-600 Page 8
SECTION 3
MAINTENANCE
FIGURE 3-1 - LUBRICATION
GENERAL
Blower efficiency and life depend on the quality of maintenance the blower receives. Maintenance must
be done regularly and with care. Clean work space, tools, solvents and wiping rags are necessary to
avoid transferring dirt into the unit. Scheduling regular maintenance of the blower will insure long trouble-
free service.
LUBRICATION
Gears and bearings are splash lubricated by an oil slinger in each sump. Check the oil level in both
sumps daily. Do not operate the blower if the oil level is not in the middle of the sight gauge for each
sump when the blower is not running.
FILLING PROCEDURE
Refer to FIGURE 3-1. While the blower is not running remove the plug (B) from each sump. Add oil to
each sump until it reaches the middle of each oil level sight gauge (H). Secure the plug (B) in each end.
LUBRICATION SERVICE
Add fresh oil as required to maintain proper level. If premium grade mineral oil is used, the oil should be
drained, the gearbox flushed and the oil replaced every 1500 hours or more frequently if inspection so
indicates. The oil change period is governed by operating conditions such as load, temperature, dirt,
humidity, fumes and the quality of the oil used. The oil drain plug is located at (A). With AEON PD
synthetic blower lubricant, perform the above oil-change maintenance after 4500 to 7500 hours.
Do not overfill as this will tend to cause excessive heating of the gears and may damage the
unit.
RECOMMENDED LUBRICANT
Oil Fill Ports Vertical Horizontal
Shaft End 1.0 1.25
Gear End 1.5 2.0
FIGURE 3-2 –APPROXIMATE OIL CAPACITIES (PINTS)
A. Oil Drain Plug
B. Plug/Oil Fill
H. Oil Level Sight Gauge

HF-7-600 Page 9
GARDNER DENVER LUBRICANT ORDER INFORMATION
Re-order Part Numbers for AEON PD Series Factory-Recommended Synthetic Lubricants.
AEON PD Synthetic Lubricant
Description Part Number
1 Quart 28G23
Case/ 12 Quarts 28G24
1 Gallon 28G40
5 Gallon Pail 28G25
55 Gallon Drum 28G28
AEON PD-Food Grade Synthetic Lubricant
Description Part Number
1 Quart 28H97
Case/ 12 Quarts 28H98
1 Gallon 28H333
5 Gallon Pail 28H99
55 Gallon Drum 28H100
AEON PD-XD Extreme Duty Synthetic Lubricant
Description Part Number
1 Quart 28G46
Case/ 12 Quarts 28G47
1 Gallon 28G42
5 Gallon Pail 28G44
55 Gallon Drum 28G45
Call your local Gardner Denver distributor to place your order for Gardner Denver Lubricants. Your
Authorized Gardner Denver Distributor is:

HF-7-600 Page 10
AEON PD Series Lubricant is formulated especially for positive displacement blower service to provide
maximum blower protection at any temperature. One fill of AEON PD Series Lubricant will last a
minimum of 4 times longer than a premium mineral oil. Refer to FIGURE 3-3, page 10.
* For ambient temperatures less than 100F, but not less than -200F, the use of oil sump heaters or
heated enclosures is required.
** For ambient temperatures 100F to 320F, the use of oil sump heaters or heated enclosures is
recommended. FIGURE 3-3 –SYNTHETIC LUBRICANT CHART

HF-7-600 Page 11
AIR FILTERS AND FILTER SILENCERS
Servicing the air filters is one of the most important maintenance operations to be performed to
insure long blower life.
Servicing frequency of filter elements is not time predictable. A differential pressure indicator, with a
continuous gauge reading, should be installed across the inlet filter. It will tell how much of the service life
of the filter element has been used. It will also eliminate both premature filter servicing and premature
blower failure due to a plugged filter when the filter pressure drop is used to establish maintenance
points.
In all cases refer to the filter manufacturer’s service instructions. Due to the many types of filters, it is not
practical to give specific instructions covering all models.
NOTICE
No matter what type of filter is used, always make sure all seats, gaskets, clamps and hose
connections on the filter and inlet line are absolutely air tight. Each time the filter is serviced,
inspect interior of the blower for dirt.
PERIODIC INSPECITIONS
A good maintenance program will provide for periodic inspections of the blower and drive components.
The following inspections may prevent major repairs and downtime:
1. Observe the blower for vibration, heating, noise, oil leaks and excessive air leaks.
2. Check for proper operation of the filters, silencers, couplings, drive belts, motor (or power unit),
relief valve, check valve, gauges and other controls.
3. Disconnect the drive and turn the blower by hand to check for drag, tight spots, bearing wear and
gear backlash. Rotation should be free with no indication of drag or metallic interference.
4. Inspect the interior of the blower through the inlet or discharge port for cleanliness, corrosion and
contact of internal parts.
5. Check the tightness of all screws, bolts and nuts.

HF-7-600 Page 12
SECTION 4
OPERATION
Future operating problems can be avoided if proper precautions are observed when the equipment is first
put into service.
NOTICE
Machines are shipped without oil in the sumps. Do not operate before adding lubricant.
Before starting under power, the blower should be turned over by hand to make certain there is no
binding, or internal contact.
Each size blower has limits on pressure differential, running speed and discharge temperature which
must not be exceeded. These limits are shown in the following tabulation. Refer to FIGURE 4-1, page 12.
Operating beyond the specified operating limitations will result in damage to the unit.
It is important that the pressures and temperatures are measured directly at the ports of the blower to
avoid error that may be caused by intervening pipe runs, fittings, etc.
Relief valves should be used to protect against excessive pressure or vacuum conditions. These valves
should be tested at initial startup to be sure they are adjusted to relieve at or below the maximum
pressure differential rating of the blower.
NOTICE
Relief valves should be placed as close as possible to the blower inlet or discharge.
In some instances, pressure may be relieved at a lower point than the blower maximum in order to protect
the motor or the equipment served by the blower.
Discharge temperature switches are recommended to protect against excessive inlet restriction or inlet
temperatures. Check valves in the discharge line on pressure blowers and in the inlet line on vacuum
blowers are recommended to protect the blower from motoring backwards when shut down under load.
LIMITATIONS
For information regarding limitations, refer to FIGURE 4-1, below.
MAXIMUM OPERATING LIMITATIONS
SIZE RPM PRESSURE PSI VACUUM IN HG TEMPERATURE RISE ° F DISCHARGE TEMPERATURE ° F
HF 408 4000 15 16 250 350
HF 406 4000 15 16 250 350
DO NOT EXCEED THESE LIMITS
FIGURE 4-1 –MAXIMUM OPERATING LIMITATIONS
NOTICE
Blower speed, line losses, elevation, and increased inlet temperatures
will affect the maximum operating limitations.

HF-7-600 Page 13
BLOWER STARTUP CHECKLIST
This startup procedure should be followed during the initial installation and after any shutdown periods or
after the blower has been worked on or moved to new location. It is suggested that the steps be followed
in sequence and checked off (√) in the boxes provided.
1. Check the unit and all piping for foreign material and clean if required.
2. Check the flatness of the feet and the alignment of the drive. Feet that are bolted down
in a bind can cause housing distortion and internal rubbing. Misaligned V-drives can
cause the impellers to rub against the headplates and cause a reduction in the volumetric
efficiency of the unit. Misaligned couplings can ruin bearings.
3. If the blower is V-belt driven, check the belt tension and alignment. Over-tensioned belts
create heavy bearing loads which lead to premature failure.
4. Be sure adequate drive guards are in place to protect the operator from severe personal
injury from incidental contact.
5. Check the unit for proper lubrication. Proper oil level cannot be over-emphasized. Too
little oil will ruin bearings and gears. Too much oil will cause overheating and can ruin
gears and cause other damage.
6. With motor electrical power locked out and disconnected, turn the drive shaft by hand to
be certain the impellers do not bind.
7. “Jog”the unit with the motor a few times to check that rotation is in the proper direction,
and to be certain it turns freely and smoothly.
8. The internal surfaces of all Gardner Denver units are mist sprayed with a rust preventive
to protect the machine during the shipping and installation period. This film should be
removed upon initial startup.
9. Start the unit and operate 15 minutes at no load. During this time, check for hot spots
and other indications of interference.
10. Apply the load and observe the operation of the unit for one hour. Check frequently
during the first day of operation.
11. If malfunctions occur, do not continue to operate. Problems such as knocking rotors can
cause serious damage if the unit is operated without correction.