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7.9. MAINTENANCE
Regular maintenance will help ensure longer pump life and more reliable operation. It is recommended that
pumps in intermittent operation be inspected twice a year and pumps in continuous operation be inspected every
1,000 hours. The following is a listing of required inspection and maintenance items.
If any of the problems described in the following list exists, stop operating the pump to avoid damage or
personal injury.
1. CABLE ENTRY
Make sure that the cable entry flange and strain relief clamp are tight. If the cable entry is showing signs of
leakage remove cable from entry, remove grommet, cut a piece of cable off so that the grommet seats on a new
portion of the cable, replace grommet, and reinstall cable assembly, into the top of the motor.
Note: Explosion Proof cables are sealed with a Factory Mutual Approved potting compound. Please consult
factory for instruction.
2. CABLES
Inspect the cable for cuts, scrapes or sharp bends. If the outer jacket is damaged, replace the cable. Splices of
the power or control cable within the wet well area are not acceptable.
3. MOTOR INSULATION RESISTANCE
Megger the insulation between the phases; and between any phase and ground. Resistance values should be
greater than 1 M ohm. If abnormal readings are obtained, contact authorized service center immediately.
4. EXTERNAL PARTS ON PUMP
Make sure that all screws, bolts and nuts are tight. Check the condition of pump lifting eyes and replace if
damaged or worn, Replace any external part that appears worn or damaged.
5. SEAL CHAMBER OIL
Note: Use extreme care when removing the seal chamber plug, as the chamber may become pressurized if seal
failure has occurred.
Seal chamber oil should be checked for signs of water intrusion, or other impurities any time the pump is removed
from wet well. To check the condition of the oil, remove the oil fill plug. Drain the chamber volume into a
transparent container. Visually check sample for impurities or emulsification (oil may appear cream-like if a small
amount of water is present). If significant water intrusion has occurred, remove and replace lower mechanical
seal. Unless obvious mechanical damage has occurred to the lower seal, it is good practice to replace the upper
and lower mechanical seals as a set. Refill seal chamber with fresh oil to the bottom of fill plug port (when pump is
in vertical position) and replace oil fill plug.
6. IMPELLER
Periodically inspect impeller by turning pump on its side, remove suction strainer nuts and strainer to expose
impeller and relocate position of adjusting plate (suction cover) as needed. Replace the impeller if it is damaged
or worn.
7.10. SPARE PARTS
In order to obtain spare parts identify the required parts, and contact authorized HOMA customer service with
your order. Authentic HOMA parts shall be used to maintain warranty.
Explosion Proof pumps must be identified as such, and the pump serial number must be referenced for
proper parts identification.
7.11. RECOMMENDED TOOLS AND SUPPLIES
In addition to ordinary maintenance and lifting devices, ensure that complete set of metric Allen wrenches,
impeller puller, bolt adhesive and Anti-seize compound are on hand.
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