HOMA A Series Impeller Change - Manual (Page 2)

Publication
88FN2020
Please Contact Technical Support At 203-736-8890 With Any Additional Questions
Please Be Prepared To Provide Pump Serial Number During Call
Page
2 of 2
• Using appropriate size hex head socket (17mm,14mm or 8mm) and ratchet, remove
impeller bolt. The clamp disk may come off with bolt, or it may be stuck in impeller hub.
Push the clamping disk out from the backside.
• Remove impeller from pump shaft. For larger impellers use appropriate device to
support the impeller from falling. If impeller will not slide freely off of shaft, carefully
insert pry bars behind the impeller shroud at opposing sides and evenly apply pressure
to move impeller off the shaft. Care must be used to avoid damage to the rear impeller
shroud when prying. Do not allow the impeller to drop.
• Locate and remove the impeller key, and place with clamping disk for reinstallation. If
not removed before, knock the clamping disk out of impeller hub.
• Clean old thread locking material out of shaft threads. Use the appropriate sized
tap (m20x2.5, m16x2 or 10x1.5) to chase the threads to remove material. If the
correct size tap is not available, solvent and a stiff wire brush may be sufficient.
However, be certain the internal threads of pump shaft are clean, as new thread
locking compound will not adhere to old material. Improper cleaning may result
in impeller bolt coming loose during operation, resulting in severe damage to
pump.
• Inspect the impeller key, replace if damaged. Install impeller key onto pump shaft, and
apply anti seize compound to shaft end. DO NOT APPLY ANTI SEIZE TO THREADS!
• Install impeller onto pump shaft. Take care to carefully line up impeller keyway to the
installed key.
• Install new impeller bolt with the clamp disk using #262 red thread locking
compound on impeller bolt. Prevent the impeller from rotating as done during
removal, and tighten impeller bolt with torque wrench to specified torque (210 ft #
for 20mm bolt, 108 ft # for 16mm bolt and 26 ft # for 10mm bolt).
• Using suitable lifting device, reinstall volute onto pump. Line up match marks made
prior to removal. Reinstall volute bolts after applying thread locking compound and
tighten to specified torque (45 ft pounds for 12mm bolts and 26 ft for 10mm bolts).
• With volute bolts tightened, physically verify that impeller rotates freely with no binding.
If pump turns freely, it is ready for reinstallation.