HOMA GRP Impeller Change - Manual

Publication
88FN2060A
Please Contact Technical Support At 203-736-8890 With Any Additional Questions
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GRP Impeller Change
This procedure is an addendum to the HOMA GRP IOM, and outlines the requirements for
adjustment of suction cover as wear occurs. All decontamination and safety procedures outlined in
the IOM must be employed.
• Position and support pump upside down with the suction connection facing up.
• Mark the location of the suction cover to the volute to ease reassembly.
• Remove socket head cap screws that retain suction cover. Do not disturb the set
screws for suction cover adjustment.
• Remove suction cover, taking care to protect the O Ring.
• Holding cutter head with suitable device loosen the impeller retaining bolt and remove.
• Remove cutter head from impeller. Carefully pull impeller off of shaft. Important: The
impeller holds lower mechanical seal in place. Take care not to disturb
mechanical seal.
• Verify impeller key is still properly positioned on shaft.
• Install new impeller onto shaft, and reinstall cutter head. Note: Take care to properly
position dowel pin into locating hole in impeller.
• While holding the cutter head with suitable device, reinstall impeller bolt. Torque to 18
ft. lbs. ( Use of Loctite 242 on impeller bolt is desirable)
• Reinstall suction cover, taking care to lubricate the O ring before installation.
• Replace the retaining bolts for the suction cover. Torque to 12 ft. lbs.
• Rotate the cutter head and verify that no contact occurs between cutter and ring.
• Unit should now be ready for test operation. Return unit to normal orientation, connect
power, and start pump. Some slight rubbing may be heard, and is acceptable.
However, if severe grinding or rubbing is evident, adjust suction cover (with unit
disconnected from power supply) until components move freely. This may require
more than one adjustment to obtain proper clearance.
Notes: If oil is found leaking from the impeller/volute/seal area, the mechanical seal
was not compressed properly during the impeller installation. Disassemble unit, and