This information is believed to be accurate by Bauer Compressors, Inc., as of it’s date of publication, but
Bauer offers NO WARRANTY regarding the accuracy, or continuing accuracy, of the information set forth
herein. Bauer shall not be liable for inaccuracies in, or consequences resulting from, your use of this information. All information supplied is in connection with sales of Bauer’s products, and is thus subject to
Bauer’s standard terms and conditions of sale. Bauer reserves the right to change this information and has
no obligation to update these materials. This information is copyrighted by Bauer Compressors, Inc., and
Bauer reserves to itself all rights to this publication. Bauer’s customers have no right to reproduce, rewrite,
modify, license or permit anyone else’s use of this information, without the express written permission of
Bauer Compressors, Inc.
^WARNING
This Instruction Manual and Replacement Parts List contains safety information and instructions
for the G 120 II V High Pressure Gas Compressor Units.
You must read, understand and follow all safety precautions and instructions.
1.1HOW TO USE THIS MANUAL.........................................................................................................................................1
1.2HOW TO USE THE REPLACEMENT PARTS LIST....................................................................................................2
1.3HOW TO USE THE APPENDIX.......................................................................................................................................3
1.4.0.2Purification System Applicability ..................................................................................................................................4
2.1.2.2Main Menu Screen.......................................................................................................................................................... 7
2.1.2.2.3 Status .............................................................................................................................................................................. 8
2.2STARTING AND STOPPING UNIT...............................................................................................................................10
2.2.3To Stop Unit. .................................................................................................................................................................... 11
CHAPTER 3:- - - - - - - - - - - - - - - - - - - - - - IK120 II C & G
3.1MAINTENANCE AND PARTS.......................................................................................................................................15
3.1.5Venting the Oil Pump.......................................................................................................................................................19
3.1.5.1Gas Intake System ........................................................................................................................................................ 19
3.1.8Valves and Heads .............................................................................................................................................................21
3.1.8.2General Instructions for Changing the Valves..............................................................................................................22
3.1.8.3Changing the IK120 II C & G, 1st Stage Valve ...........................................................................................................23
3.1.8.4Removing the IK120 II C & G, 2nd Stage Valves. ......................................................................................................24
3.1.8.5Reassembling the Valves of the 2nd Stage. ..................................................................................................................25
3.1.8.6Removing the IK120 II C & G, 3rd Stage Valves ........................................................................................................26
3.1.8.7Reassembling the Valves of the 3rd Stage....................................................................................................................27
3.1.9Replacement Parts List.....................................................................................................................................................28
3.1.10Troubleshooting and Repair .............................................................................................................................................47
3.2.4ACD Replacement Parts List............................................................................................................................................52
3.3.1Condensate Collector Replacement Parts List .................................................................................................................55
4.1.1General Purification System Procedures..........................................................................................................................56
4.1.4Model, Serial Number and Part Number Identification ...................................................................................................57
4.1.4.2Purification System Dataplate ......................................................................................................................................58
4.1.5Breathing Air Purification System Configurations ..........................................................................................................58
4.1.6Industrial Purification System Configurations .................................................................................................................59
4.1.7Cartridge Operating Life ..................................................................................................................................................59
4.1.7.1Calculating the Maximum Cartridge Operating Hours.................................................................................................60
4.1.7.2Calculating the Adjusted Cartridge Operating Hours...................................................................................................60
4.2.2.1Oil & Water (condensate) Separator.............................................................................................................................64
4.3.1Oil and Water Separator...................................................................................................................................................66
4.3.2.1Leaking at the Safety Bore ...........................................................................................................................................68
4.4REPLACEMENT PARTS LIST......................................................................................................................................69
CHAPTER 5:- - - - - - - - - - - - COMPRESSOR DRIVE; G 120 II V
5.2MAINTENANCE OF THE V-BELT AND SHEAVES.................................................................................................. 72
5.2.1Check The Sheaves. ......................................................................................................................................................... 72
5.2.2Check the V-belt...............................................................................................................................................................72
5.3REPLACEMENT PART LIST ........................................................................................................................................73
6.3AC POWER REQUIREMENTS...................................................................................................................................... 76
6.4.2Replacing the PLC ...........................................................................................................................................................78
6.4.3Installing a New Program.................................................................................................................................................78
6.4.4Installing an EEPROM.....................................................................................................................................................78
6.4.6Transformer and Fuses .....................................................................................................................................................79
6.5.3Compressor High Temperature ........................................................................................................................................ 83
6.6PLC INPUTS AND OUTPUTS ........................................................................................................................................84
6.6.1Analog Inputs to the PLC.................................................................................................................................................85
6.8REPLACEMENT PARTS LIST ......................................................................................................................................88
6.9PARTS LIST FOR MODELS WITH A 5 HORSEPOWER MOTOR.........................................................................96
6.10 PARTS LIST FOR MODELS WITH A 7½ HORSEPOWER MOTOR......................................................................97
6.11 PARTS LIST FOR MODELS WITH A 10 HORSEPOWER MOTOR.......................................................................98
6.12 PARTS LIST FOR MODELS WITH A 15 HORSEPOWER MOTOR.......................................................................99
6.13 PARTS LIST FOR MODELS WITH A 20 HORSEPOWER MOTOR.....................................................................100
7.2REPLACEMENT PARTS LIST ....................................................................................................................................101
8.2UNPACKING, HANDLING AND INSTALLATION..................................................................................................108
8.2.1Unpacking and Handling................................................................................................................................................108
8.2.2Installation of the Compressor Unit ...............................................................................................................................109
8.2.3.1Inside Air Source ........................................................................................................................................................111
8.2.3.2Outside Air Source......................................................................................................................................................112
8.3LONG TERM STORAGE...............................................................................................................................................116
8.3.2.1Units Equipped with a Filter System ..........................................................................................................................116
8.3.3Preserving the Compressor.............................................................................................................................................116
8.3.4Preventive Maintenance During Storage........................................................................................................................117
8.3.5Lubrication Oils for Preservation ...................................................................................................................................117
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8.3.6Reactivating the Compressor Unit .................................................................................................................................117
8.4.3Record of Operating Hours ............................................................................................................................................122
8.5.5Glossary of Abbreviations and Acronyms .....................................................................................................................124
8.6.1Diagrams and Drawings.................................................................................................................................................125
Figure 2-3Maple System; Run Screen......................................................................................................................................6
Figure 2-4Maple System; Home Screen...................................................................................................................................7
CHAPTER 3:- - - - - - - - - - - - - - - - - - - - - - IK120 II C & G
Figure 3-1IK120 II C & G Compressor Blocks, Front View .................................................................................................15
Figure 3-5Oil Filler Cap .........................................................................................................................................................18
Figure 3-6Removing the Oil Filter Cover ..............................................................................................................................18
Figure 3-7Replacing the Oil Filter .........................................................................................................................................18
Figure 3-10IK120II C & G, 1st Stage Valve............................................................................................................................22
Figure 3-11IK120 II C 1st Stage Valve Head and Plate Valve................................................................................................23
Figure 3-12IK120 II C & G, 2nd Stage Valve Head and Valves .............................................................................................24
Figure 3-13Using the Special Valve Tool ................................................................................................................................25
Figure 3-14Securing the Intake Valve......................................................................................................................................25
Figure 3-15IK120 II C & G, 3rd Stage Valve Head and Valves..............................................................................................26
Figure 3-16Removing the 3rd Stage Pressure Valve ...............................................................................................................27
Figure 3-18Piston and Cylinder, 1st Stage...............................................................................................................................30
Figure 3-19Piston and Cylinder, 2nd Stage..............................................................................................................................31
Figure 3-20Piston and Cylinder, 3rd Stage ..............................................................................................................................32
Figure 3-21Piston and Sleeve, 3rd Stage..................................................................................................................................33
Figure 3-221st Stage Valve Head and Valve, IK120 II C & G................................................................................................34
Figure 3-232nd Stage Valves and Valve Head.........................................................................................................................36
Figure 3-243rd Stage Valves and Valve Head .........................................................................................................................38
Figure 3-27Lubrication System Assembly...............................................................................................................................42
Figure 4-3Purification System Dataplates (typical) ............................................................................................................... 57
Figure 4-4Correction Factor for Cartridge Operating Hours ................................................................................................. 61
Figure 4-5Example Record of Adjusted Operating Hours.....................................................................................................61
Figure 4-6P1 Purification System ..........................................................................................................................................63
Figure 4-7Oil and Water Separator ........................................................................................................................................64
Figure 4-8Oil and Water Separator Labels ............................................................................................................................65
Figure 4-9Oil and Water Separator ........................................................................................................................................67
Figure 4-10Sintered Metal Filter Assembly.............................................................................................................................67
Figure 4-12P1 Purification System Parts List.......................................................................................................................... 69
Figure 4-13Oil and Water Separator Parts List........................................................................................................................70
Figure 4-1410” Chamber Parts List .........................................................................................................................................71
CHAPTER 5:- - - - - - - - - - - - COMPRESSOR DRIVE; G 120 II V
Figure 5-1Vertical Drive with Idler (typical)......................................................................................................................... 72
Figure 5-2G 120 II V Drive with Idler .................................................................................................................................. 73
Figure 6-6Transformer and Fuses ..........................................................................................................................................79
Figure 6-11High Temperature Switch......................................................................................................................................83
Figure 8-3Example of Air Intake Piping..............................................................................................................................113
Figure 8-4Incoming Power Wiring Label ............................................................................................................................114
Figure 8-56 Bolt and 4 Bolt Torque Sequence.....................................................................................................................123
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MNL-126509
CHAPTER 1: INTRODUCTION
1.1How To Use This Manual
This manual contains the operating and maintenance instructions for the Bauer Compressors, Inc. products listed on the front cover.
All instructions in this manual should be observed and carried out as written to prevent damage or premature wear to the product or the equipment served by it.
If your unit is equipped with nonstandard accessories and or options, supplemental information is normally included in other documentation; i.e. OEM Manuals or additional Bauer Manuals.
While every effort is made to ensure the accuracy of the information contained in this manual, Bauer
Compressors, Inc. will not, under any circumstances be held accountable for any inaccuracies or the consequences thereof.
1.1.1Manual Safety Notices
Important instructions concerning the endangerment of personnel, technical safety or operator safety will
be specially emphasized in this manual by placing the information in the following types of safety
notices.
^DANGER
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or seri-
ous injury. This is limited to the most extreme situations.
^WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or
injury.
^CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or mod-
erate injury. It may also be used to alert against unsafe practices.
NOTICE
NOTE advise of technical requirements that require particular attention by the operator or the mainte-
nance technician for proper maintenance and utilization of the equipment.
April 4, 2013Page 1
G 120 II V
1.2How to Use the Replacement Parts List
• A lozenge in the Item Number column indicates the part number for a complete assembly.
• a dagger (†) in the Qty column with or without an ellipse (…) in the Part Number column means the
part is illustrated for assembly purposes only and is not available for sale as an individual component.
This part can be obtained by ordering the complete assembly.
• AR in the Qty column means that the item is cut or manufactured to the size which the customer specifies.
• A dash (—) in the Item Number column indicates that there is more than one part number applicable
to the preceding Item Number.
• The letters in the columns labeled Kit indicate the number of operating hours when the part is to be
replaced; a = replaced every 1,000 hours, b = replaced every 2,000 hours and c= replaced every 4,000
hours.
• NS in the Item Number column indicates the part is not illustrated but is available.
When placing an order for spare parts, please provide the following information to ensure delivery of the
correct parts. The model number, date of manufacture and serial number can be found of the compressor
unit identification plate on the compressor unit frame.
InformationExample
Model NumberVC 120
Serial Number143156
Date of Manufacture02/2013
Part NumberVAL-0500
Part Description Valve
Part Quantity Required1
Figure 1-1Compressor Identification Label
BAUER COMPRESSORS, INC.
NORFOLK, VA 23502 U.S.A. (757) 855-6006
MODEL NO.
BLOCK NO.
SERIAL NO.
QUANTITY
MFG. DATE
Page 21st Edition, Rev. 0 Chg. 2
MNL-126509
^WARNING
The use of repair parts other than those included in the Bauer Replacement Parts Lists may create unsafe
conditions over which Bauer has no control. Such unsafe conditions can lead to accidents that may be life-
threatening, cause substantial bodily injury, and/or result in damage to the equipment. Therefore, Bauer
Compressors, Inc. can bear no responsibility for equipment in which unapproved repair parts are installed.
1.3How to Use the Appendix
Information contained in the Appendix to this manual includes the following.
• The safety instructions applicable to this product. They must be read, understood and complied with
prior to operating the product.
• The instructions for installing this product. They must be read, understood and complied with prior to
operating the product.
• Reproducible Forms
• Reference Data
• Torque Values
• Torque Sequence
• Conversion Formulas
• Approved Lubricants
• Glossary of Abbreviations & Acronyms
• Additional Documents
April 4, 2013Page 3
1.4Unit Specifications
All specifications are subject to change without prior notice.
The G 120 II V is standardly equipped with the Bauer P1 or Oil Removal Filtration System.
1.4.0.3Pressure Switch Settings
1.4.0.3.1 Inlet Pressure Switch Settings
Low Inlet Pressure0.0 psig
High Inlet Pressure1.5 psig
1.4.0.3.2 Final Pressure Switch Setting
Final Pressure2,400 psig
Restart Pressure1,900 psig
Final Safety Valve2,800 psig
Page 41st Edition, Rev. 0 Chg. 2
MNL-126509
SECURUS
CHAPTER 2: OPERATING INSTRUCTIONS; MAPLE SYSTEM
2.1Description
The following instructions apply to units that use the Maple System touchscreen operator interface,
MNR-0053 with program 31L.
Figure 2-1MNR-0053
The Electrical Panel Assembly will provide logical control and safety shutdowns for the compressor
equipment. All necessary time delays, counters, shutdowns, sequencing and safety features are incorporated into a proprietary software program permanently saved into PLC memory using EEPROM technology. The PLC is equipped with a 200 day in battery to maintain the PLC’s internal clock. The software
program is based on the pressure and use of the compressor. The operator uses the Operator Interface to
communicate with the PLC which is located in the electrical enclosure.
2.1.1Emergency Stop Button
A Normally Closed switch when pulled out, when the E-Stop Button is pressed in, it disconnects the
main power source, turning off the compressor, draining the ACD system and stopping air delivery to
the consuming devices. This button is to be used in case of emergency. Normal operational stops should
be accomplished using the operator interface.
Figure 2-2PLC & Battery
200 DAY
BATTERY
PLC
April 4, 2013Page 5
G 120 II V
2.1.2Operator Interface
The Operator Interface is a 4.3 inch, 256 color, 8 bit LCD with touchscreen operation. The Operator
Interface is the input/output device for normal operation of the compressor unit. The compressor system
is ready and able to operate after the Emergency Stop Switch is pulled out and the red “COM” status light
illuminates. The red status light will continuously strobe to show that the unit is ready.
2.1.2.1Run Screen
The initial screen after startup allows control and monitoring of the compressor unit.
Figure 2-3Maple System; Run Screen
45
(CO) MONITOR
SECURUS
1
6
7
8
2
9
3
1. Securus / Secant Status
2. Current Run Time
3. Next Maintenance Due Status
4. Status Lights
5. ON & OFF Buttons
1. If the unit is equipped with a CO monitor, the words (CO) monitor are shown here. Also if the unit
is equipped with a Securus or Seccant monitor, the status of the monitor is shown here.
6. Closes Window (goes to main menu)
7. Current Time & Date
8. Final Pressure (from sensor)
9. Current Oil Pressure (from sensor)
10. Inlet Pressure (if equipped with sensor)
10
2. This reading shows the current run time of the compressor in hours. Once the compressor is turned
off this reading returns to zero. For total hours on the unit check the status screen.
3. This reading tells when the next maintenance is due on the compressor.
4. These lights show the status of electrical connections and communication. The red light strobes
continuously to show communication is established with the PLC. The green light indicates that the
PLC has power, and the yellow light indicates power is coming into the unit.
Page 61st Edition, Rev. 0 Chg. 2
MNL-126509
5. The ON and OFF buttons control the compressor. These buttons should be used for normal starting
and stopping of the compressor. In an emergency the Emergency Stop button should be used.
6. This X button closes the Run screen and goes to the main menu screen. The compressor may still be
operating when returning to the main menu screen.
7. The current time and date are shown here. This data can be corrected only by user levels 2 and 3.
8. The final pressure reading is displayed here. It is received from the final pressure sensor near the
outlet.
9. This oil pressure reading displays a continuous pressure from the compressor. This reading is taken
from the oil pressure sensor on the compressor block.
10. This space a reserved for units with inlet pressure sensors. A continuous inlet pressure reading is
provided. This is mainly for units designed to compress natural or industrial gases.
2.1.2.2Main Menu Screen
Figure 2-4Maple System; Home Screen
1
2
3
4
5
1. User Level Status
2. Run Screen Button
3. Alarm History Button
The home screen is the main screen used to navigate to the other 8 options. All of the option screens can
be viewed but critical changes can only be made by user levels 2 & 3. Critical changes control the functions of the compressor. This feature is added to prevent unintentional changes to the unit’s functions.
2.1.2.2.1 Run
This button returns the user to the RUN screen, See Paragraph 2.1.2.1 for further information.
4. Status Button
5. Contact Information Button
6. Login Button
7. Configuration Button
8. Parameters Button
9. Tools Button
6
7
8
9
April 4, 2013Page 7
G 120 II V
1
2
3
4
5
25.01
15.0
514
2.1.2.2.2 Alarms History
This button displays the history of alarms. The date of the alarm history can be changed with the drop
down arrow or the forward and backward arrows adjacent to the date. To return to the Main Menu screen
touch the X in the upper right corner.
2.1.2.2.3 Status
The status button takes the user to the status screen. The status screen allows the user to view the Current
Run Time, Total Run Time, Minutes till next ACD cycle, current Separator Count, and the Current Final
Pressure.
Figure 2-5Status Screen
1. Calendar / Hour Selection
2. ACD Test Button
3. Return Button
4. View Maint. Schedule
5. Light ON / OFF Button
The options on the Status screen are shown in Figure 2-5. The Selection button allows the operator to
select maintenance warnings by the calendar schedule or the hourly maintenance schedule. The ACD
Test button is used to perform an ACD test. Pressing this button opens the ACD valve and the operator
should be able to hear the ACD draining. The Return button takes the user back to the Main Menu screen.
The Maintenance schedule buttons allow the user to view the Maintenance schedule by calendar days or
by hours (See Table 2-1& 2-2). The Light ON / OFF button is used on some models equipped with lights.
This button toggles the light on and off.
2.1.2.2.4 Contact
Pressing the contact button displays contact information for maintenance and assistance for your unit. It
can only be edited by users 2 & 3.
2.1.2.2.5 Login
The login button takes the user to the login screen. The default option is User l, Operator. No password is
needed to operate the compressor at this user level. At this user level the operator can operate the unit and
explore all the other menu screens but cannot change parameters or configuration settings. User 2, Level
1, can operate the compressor and also is allowed to change some parameters and configuration settings.
User 3, Factory Level, has total access to the unit and can change all parameters and configuration settings.
Page 81st Edition, Rev. 0 Chg. 2
MNL-126509
Figure 2-6Login Screens
To change the user level press the “USER” button, select the desired user, and press “OK”. Then press the
button below the words “Enter Password” and press the password numbers on the keypad. After entering
the proper password press “ENT” on the keypad to enter the password. If the password is incorrect an
“Invalid Password” screen will pop up. The only option on the screen is to click “OK”. If the password is
accepted the screen will return to the login screen with the new user level shown.
2.1.2.2.6 Configuration
The Configuration button is used to setup the features that make the unit. There are a total of 4 pages in
this option. The first two pages consist of 8 features which a unit may have. The third page is used to set
the final pressure sensor limit. The fourth page is used to set the inlet pressure sensor limit. Similar to the
Parameter’s settings changing the Configuration settings will change how the unit operates so only users
2 & 3 are allowed to change them. Pressing the X button returns the user to the main menu screen.
April 4, 2013Page 9
G 120 II V
2.1.2.2.7 Parameters
This button takes the user to the parameters screens. There are a total of 9 screens. These parameters are
set at the factory for each specific unit. Changing these parameters will change how the unit operates, so
only users 2 and 3 are allowed to change them. If user 1, Operator, tries to change a parameter a window
will pop up stating “Access Denied”. To change a parameter just touch the number which needs to be
changed and a keypad will pop up. Punch in the new number and press the “ENT” key.
Figure 2-7Parameters Screen
Pressing the Pressure Units button toggles the run screen pressures between PSI and BAR.
Pressing the X button will return the screen to the main menu.
2.1.2.2.8 Tools
Like the Parameters and Configuration options only users 2 & 3 can make changes or use this option. The
first page of the tools option is used for maintenance purposes. The buttons are used to check the PLC and
can only be used when the unit is OFF. The second page is used to set the internal calendar/clock and to
select the language displayed on the monitor. English, Spanish, and Portuguese are the current choices.
More languages may be added at a later date. The third page offers activation of the Anybus (internet)
Server, to turn off or on the key beeping sound, or to clear the alarm history. The final button “START” is
used to save the current set parameters to the internal EEPROM. If this button is pressed the current setting are saved to the memory and a status bar of the operation will be shown.
2.2Starting and Stopping Unit
2.2.1Before Starting.
1. Check the compressor oil level, See Chapter 3.
2. Ensure that all panels and guards are properly installed.
3. If the unit is equipped with doors, ensure all doors are closed.
4. Ensure that the E-Stop Button is pulled out.
Page 101st Edition, Rev. 0 Chg. 2
MNL-126509
2.2.2To Start Unit.
Press the green START Button on the Run Screen. (See Figure 2-3)
If the pressure in the system is lower than the set “Start Pressure”, the drive motor will start up powering
the compressor. If the system’s pressure is higher than the set “Start Pressure” or when the air pressure
has increased to the set “Operating Pressure”, the drive motor will automatically shutdown. The Compressor will automatically restart when the system’s pressure drops below the set “Start Pressure”.
^WARNING
Once started the compressor and drive motor will start and stop automatically.
Stay clear of all moving parts whenever unit has power.
2.2.3To Stop Unit.
Press the red STOP Button on the Run screen..
NOTICE
In an emergency the compressor is shutdown by pressing
The IK120 II C & G compressors are used to compress gases up to a maximum of 5,000 psi. Both compressors are three cylinder, three stage air cooled, oil lubricated reciprocating compressors. The 3rd stage
cylinder is lubricated by means of the forced feed lubrication system, while the other cylinders are splash
lubricated. The cylinders are arranged in a “W” configuration, the 1st stage is in the center, 2nd stage on
the right and 3rd stage on the left looking from the filter side.
3.1.2Component Location
Figure 3-1IK120 II C & G Compressor Blocks, Front View
1. Intake Connector
2. Oil Filler
3. 2nd Stage Safety Valve
4. 3rd Stage Cylinder
5. Oil Filter Housing
April 4, 2013Page 15
6. Inter-stage Separator
7. 2nd Stage Intercooler
8. Condensate Drain Connector
9. Final Safety Valve
10. 1st Stage Safety Valve
11. Crankcase Relief Valve
12. Gas Outlet Connector
13. 1st Stage Intercooler
14. Oil and Water Separator
Figure 3-2Air Flow Diagram
14
11
4
9
2
1
3
8
5
14
12
Purification
System
13
10
6
7
G 120 II V
1. Intake Manifold
2. 1st Stage Cylinder
3. 2nd Stage Cylinder
4. 3rd Stage Cylinder
5. 1st Stage Intercooler
6. 2nd Stage Intercooler
7. 3rd Stage Aftercooler
3.1.3Air Flow Diagram
Refer to Figure 3-2. The gas is drawn in through intake connector (1), compressed to the final pressure in
cylinders (2, 3, 4,) and cooled by intercoolers (5, 6) and after cooler (7). The safety valves (8,9, 10) protect from overpressure in the individual stages. The compressed gas is purified by Inter-stage separator
(11) and oil and water separator assembly (12). The Inter-stage separator (11) and oil and water separator
(12) are drained by condensate valves (14). An Automatic Condensate Drain system is available as an
option. The pressure maintaining valve (13) ensures that pressure is built up in the HP drying system
from the start of delivery, thus achieving constant optimum drying.
8. 1st Stage Safety Valve
9. 2nd Stage Safety Valve
10. 3rd Stage Safety Valve (Final Pressure)
11. Inter-stage Separator
12. Oil and Water Separator
13. Pressure Maintaining Valve
14. Manual Condensate Drain Valve
Page 161st Edition, Rev. 0 Chg. 2
MNL-126509
3
2
4
1
5
5
Figure 3-3Lubrication Oil Circuit
1. Oil Pump
2. Oil Filter
4. Guide Piston
5. Oil Sight Glass
3. Minimum Pressure Valve
3.1.4Compressor Lubrication
3.1.4.1Description
Refer to Figure 3-3. The compressor is provided with forced-feed lubrication. The oil pressure is produced by a low speed gear pump (1). The oil pressure is approximately 73 psi (5 bar).
The oil pump (1) is coupled to and driven by the crankshaft. It pumps oil through the oil line filter (2) and
a minimum pressure valve (3) to the 3rd stage cylinder. The oil is then distributed by the guide piston (4)
of the 3rd stage and lubricates all the moving parts of the compressor block.
The minimum pressure valve (3) allows for oil pressure indication at a pressure gauge and/or electronic
oil pressure monitoring.
^CAUTION
The Oil Pump operates only when the compressor is rotating in the correct direction. If the compressor is
rotating backwards, no oil pressure will build up damaging the compressor.
3.1.4.2Oil Level Check
Check the oil level at the sight gauge on either side of the compressor block (See Figure 3-4) every day
before putting the compressor into operation. Oil level must be between the minimum and maximum
notches. Oil level must never be below the minimum mark as this will cause severe damage due to lack of
April 4, 2013Page 17
G 120 II V
lubrication. Oil level must also not exceed the maximum mark as this will cause excessive lubrication of
the compressor and may result in a carbon buildup on the valves.
Figure 3-4Oil Sight GlassFigure 3-5Oil Filler Cap
Figure 3-6Removing the Oil Filter CoverFigure 3-7Replacing the Oil Filter
3.1.4.3Oil Change Interval
Every 2,000 operating hours or biennially; whichever comes first.
Page 181st Edition, Rev. 0 Chg. 2
MNL-126509
3.1.4.4Oil Change
1. Run the compressor until it is warm then shut it down.
2. (See Figure 3-5). Remove the cap (1) from the oil filler neck.
3. Drain oil while it is still warm by means of the oil drain plug.
^CAUTION
Replace the oil filter every oil change. Failure to do so will cause the filter to clog and the bypass valve to
open resulting in unfiltered oil being circulated and possible damage to the compressor.
4. (See Figure 3-6). Remove the two bolts (1) with a 13 mm wrench. Remove the oil filter cover (2)
5. (See Figure 3-7). Remove the oil filter (1) from the rubber gasket at the cover.
6. Mount a new filter element (P/N N25326) and replace and fasten oil filter cover.
7. Slowly pour new oil through the oil filler neck until the level reaches the maximum mark on the
sight gauge.
8. Wait a few minutes and adjust the oil level if necessary before putting the unit into operation.
3.1.5Venting the Oil Pump
(See Figure 3-7) If no or low oil pressure builds up after starting the unit, especially after maintenance
or repair or if the compressor has been run the wrong direction, venting the oil pump may be necessary.
1. Run the compressor with all condensate drains open to avoid building up pressure.
2. Unscrew Screw Cap (2) and Plug and wait until Oil comes out free of air bubbles.
3. Retighten Plug and Screw Cap.
4. Check Oil Level (See Paragraph 3.1.4.2) and replace oil as necessary.
3.1.5.1Gas Intake System
In order for these compressors to work satisfactorily, it is absolutely essential to supply the medium at a
constant pressure. Therefore a pressure reducer in the intake line is necessary if the supply pressure is
above atmospheric pressure or fluctuating. An intake expansion tank between the pressure reducer and
the compressor may also be necessary to compensate for the pressure surges caused by the 1st stage piston.
April 4, 2013Page 19
G 120 II V
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3.1.6Inter-stage Separator
An inter-stage separator is mounted on the compressor block. This separator is designed to remove oil
and water which accumulates due to the cooling of the medium after the compression process. Separation
is achieved by means of centrifugal action provided by a vortex plate (1).
Figure 3-8Inter-stage Separator
1. Vortex Plate
2. Hollow Screw
3. Center Insert
4. O-ring
^WARNING
5. Knurled Nut
6. Gasket
7. Fitting
8. Safety Valve
The rapid depressurizing and repressurizing of the inter-stage separator during condensate draining subjects it to metallurgical stresses. To prevent catastrophic failure with the possibility of
damage, injury or death the inter-stage separator must be replaced after 85,000 load cycles. A
load cycle equals one depressurization- repressurization.
Page 201st Edition, Rev. 0 Chg. 2
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