1. Manuals
  2. Brands
  3. Circor Manuals
  4. Water Pump
  5. IMO AA3G Series
  6. Product service manual

Circor IMO AA3G Series Product Service Manual

Hide thumbs Also See for IMO AA3G Series:
Table of Contents

Advertisement

Quick Links

Download this manual
The IMO General Installation Operation, Maintenance and Troubleshooting
Manual, (No. SRM00046), this manual, and associated component manuals supplied
with the unit should be read thoroughly prior to pump installation, start-up,
operation, maintenance or troubleshooting.
Manual No. SRM00074
Product Service Manual
For
AA3G Series Pumps
Size 187 Through 250
WARNING
Rev. 06 (20-0051)
 
 
1
1
 
February 2020

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the IMO AA3G Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Circor IMO AA3G Series

Summary of Contents for Circor IMO AA3G Series

  • Page 1       Product Service Manual AA3G Series Pumps Size 187 Through 250 WARNING The IMO General Installation Operation, Maintenance and Troubleshooting Manual, (No. SRM00046), this manual, and associated component manuals supplied with the unit should be read thoroughly prior to pump installation, start-up, operation, maintenance or troubleshooting.

  • Page 2: Table Of Contents

    READ THIS ENTIRE PAGE BEFORE PROCEEDING. FOR SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO EQUIPMENT, THE FOLLOWING NOMENCLATURE HAS BEEN USED IN THIS MANUAL: DANGER Failure to observe the precautions noted in this box can result in severe bodily injury or loss of life.

  • Page 3: General Instructions, Introduction, Model Designators

    GENERAL INSTRUCTIONS These instructions cover disassembly, assembly and parts identification of AA3G-187 thru 250 Series, Imo Pumps. NOTE: Individual contracts may have specific provisions that vary from manual. For further detailed information and technical assistance to questions not answered by these manuals, please refer to Imo Pump, Technical/Customer Service Department, at (704) 289-6511.

  • Page 4: Description Of Equipment

    DESCRIPTION OF EQUIPMENT The AA3G 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: Parts List, Inpection & Maintenance

    Models with Internal Relief Valves (Not available on Steel Version). ATTENTION The optional built-in relief valve is intended for momentary protection of pump against overpressure. It is not intended to be a pressure or flow control device. Continuous bypass of pumped liquid through this valve will cause the liquid to heat up very rapidly.

  • Page 6: Pump Disassembly

    DANGER BEFORE working on equipment, be sure all power to equipment is disconnected and locked-out. GENERAL COMMENTS Part number identifiers (IDPs) contained in Table 2 and shown within parenthesis such as “(8)” refer to circled numbers shown on Assembly Drawing. 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 CAUTION ATTENTION When removing inboard cover (4) from pump in step 1, below, DO NOT pull out rotors (7 & 8) They may drop to floor and be damaged. If rotors start to come out, hold them in place. 1. Remove bolts (3) from inboard cover (4) and then remove inboard cover (4) from pump housing (1). 2.

  • Page 8: Pump Reassembly

    6. 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. NOTE: Imo Pump strongly recommends replacing ball bearing each time it’s pressed off power rotor.

  • Page 9: Installation, Alignment &Troubleshooting

    8. Mesh two idler rotors (8) and power rotor (7) together into a rotor assembly making sure idler rotors and balance piston are properly engaged. 9. Install rotors by positioning pump housing in a vertical position and sliding rotor assembly into housing bore (1) until ball bearing (11) bottoms out in housing bore.

  • Page 12: Imo Pump Sales Office

    CIRCOR 1710 Airport Road -28110 PO Box 5020 Monroe, NC/USA 28111-5020 Tel: +1.877.853.7867 Fax: 1+(704) 289-9273 Email:cc@circor.com Web: www.circorpt.com          © 2020 CIRCOR Pumps North America, LLC. All rights reserved.

This manual is also suitable for:

Aa3g/nvpkfb187sp000

Table of Contents