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CFHN SERIES
PRODUCT SERVICE MANUAL
Metric standards apply for all pumps covered by this manual with regard to
Mounting dimensions, external connections, bolts, bolt threads, plugs and bearings.
WARNING
This manual AND the following CE-compliant manuals should be read thoroughly, and in their entirety,
prior to pump installation, operation and maintenance:
Manual No. SRM00100 – Safety and Operation Manual.
Manual No. SRM00101 – Installation, General Maintenance and Trouble Shooting Manual.
Electronic copies of all referenced manuals can be obtained at www.imopump.com.
Manual No. SRM00103
Rev. 02 (21-0001)
October, 2021
1
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Summary of Contents for Circor IMO CFHN Series
- Page 1 CFHN SERIES PRODUCT SERVICE MANUAL Metric standards apply for all pumps covered by this manual with regard to Mounting dimensions, external connections, bolts, bolt threads, plugs and bearings. WARNING This manual AND the following CE-compliant manuals should be read thoroughly, and in their entirety, prior to pump installation, operation and maintenance: Manual No.
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Page 2: Table Of Contents
READ THIS ENTIRE PAGE BEFORE PROCEEDING FOR SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO THE EQUIPMENT, THE FOLLOWING NOMENCLATURE HAS BEEN USED IN THIS MANUAL: Warning Level Risk Level Consequences of disregarding the warning Immediate Acute Risk Death, Serious Bodily Harm DANGER Potential Acute Risk Death, Serious Bodily Harm... -
Page 3: General Instructions
A. GENERAL INSTRUCTIONS Instructions found herein cover disassembly, assembly and parts identification of all size CFHN series Imo 3-screw pumps, sizes 20 through 330. NOTE: Individual contracts may have specific provisions that vary from this manual. Should any questions arise which are not addressed in this manual, refer to contract and to Manual No.’s SRM00100 and SRM00101. -
Page 4: Description Of The Equipment
C. DESCRIPTION OF EQUIPMENT CFHN series pumps are positive displacement, rotary screw pumps consisting of a precision bored housing that encloses a drive screw (power rotor) and two intermeshing driven screws (idler rotors). These screws, when rotating, form a succession of closures or cavities. As they rotate, fluid is moved axially from inlet to outlet port in a continuous, uniform flow with minimum fluid pulsation and pump noise. -
Page 5: Inspection
F. PARTS LIST Part number identifiers (POSITION NUMBERS / POS. NO.’s) contained in Table 2 refer to circled numbers shown on assembly drawings, Figures 4, 5 and 6. Table 2 – Parts List POS. POS. DESCRIPTION DESCRIPTION Housing 15 X Retaining Ring Inlet Cover 16 X... -
Page 6: Pump Disassembly Instructions
H.1 – GENERAL COMMENTS Part number identifiers (POSITION NUMBERS / POS. NO.’s) within parenthesis such as (8) refer to circled numbers shown on assembly drawings, Figures 4, 5 and 6. NOTE: If upon disassembly, significant wear on power or idler rotors or rotor housing is found, Imo Pump recommends replacement of entire pump. - Page 7 Figure 2 Figure 3 Elastomer Bellows Mechanical Seal Metal Bellows Mechanical Seal 5. Remove ball bearing (11) from power rotor (7) by first removing retaining ring (15) from groove in power rotor (7) shaft. Ball bearing (11) can then be removed with a gear puller or arbor press. CAUTION Removal of bearing by force applied to its outer ring could damage bearing.
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Page 8: Installation, Alignment And Troubleshooting
STATIONARY SEAT Apply light film of clean lubricating oil to O-ring on outer diameter of stationary seat. Install stationary seat into bore in inboard cover (4) with fingers so slot in non-running face of seal is facing into inboard cover (4). Do not touch sealing face with fingers or any tools. - Page 9 Figure 4 CFHN020 Pumps...
- Page 10 Figure 5 CFHN040, 060 and 090 Pumps...
- Page 11 Figure 6 CFHN140, 170 and 330 Pumps 1/16 ELASTOMER BELLOWS MECHANICAL SEAL METAL BELLOWS MECHANICAL SEAL 1/16 MAX SECTION A-A NOTE 3 ELASTOMER BELLOWS MECHANICAL SEAL WITH SPACER INLET 12 O'CLOCK SEAL VENT OUTLET 9 O'CLOCK 3 O'CLOCK WEEP HOLE TORQUE TO TORQUE TO 61 N·M +/- 7 N·...
- Page 12 CIRCOR 1710 Airport Road PO Box 5020 Monroe, NC USA 28111.5020 Tel: +1. 877.853.7867 Email: cc@circor.com Web: www.circorpt.com © 2021 CIRCOR Pumps North America, LLC. All rights reserved.
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