12
© Copyright 2020 Zoeller
®
Co. All rights reserved.
General Maintenance
Service Checklist
Electrical precautions. Before servicing a grinder pump, always shut off the main power circuit. Make sure you are wearing
insulated protective sole shoes and not standing in water. Under flooded conditions, contact your local electric company or a qualified
licensed electrician for disconnecting electrical service to the pump prior to removal.
Grinder pumps contain oil which becomes pressurized and hot under operating conditions. Allow 2-1/2 hours after shut
down before servicing pump.
Condition
A. Pump will not start or run.
B. Motor overheats and trips on overload.
C. Pump will not shut off.
D. Pump operates but delivers little or no water.
E. Pump starts and stops too often.
F. Large red flashing light comes on at control box.
G. Grease and solids accumulate in pit around pump.
GENERAL SYSTEM INSPECTION
Before the system is placed into operation, it should be inspected by a
qualified technician.
Wiring and grounding must be in accordance
with the National Electrical Code and all applicable local codes
and ordinances.
LUBRICATION PROCEDURES
No lubrication is required.
If pumps are to be stored for more than six months, refer to short term
storage procedure in the Operation section.
PREVENTIVE MAINTENANCE
P
reventive maintenance is recommended to ensure a long service
life from the product. Provided is a suggested maintenance schedule.
Every six months:
• Inspect and test system for proper operation.
• Check for proper and unobstructed float operation.
• Listen for proper check valve operation.
Every 5 years or 10,000 hours of operation:
• Remove pump, inspect and service using a Zoeller rebuild kit.
• Flush and clean basin.
Repair and service should be performed by a Zoeller
Pump Company Authorized Service Station only.
SAFETY PROCEDURES
For your protection, always disconnect pump
and panel from its power source before handling.
Never enter the basin until it has been properly
vented and tested. Any person entering a basin should be wearing
a harness with safety rope extending to the surface so that they can
be pulled out in case of asphyxiation. Sewage water gives off methane
and hydrogen sulfide gases, both of which can be highly poisonous.
Installation and checking of electrical circuits and hardware should be
performed by a qualified electrician.
Pump is never to be lifted by power cord.
Unit must be cleaned and disinfected, inside the
pumping chamber and all exterior surfaces, prior to servicing.
Common Causes
Blown panel or circuit breaker fuse, low voltage, thermal overload open, de-
fective capacitor circuit, cutter or impeller clogged, float switch held down or
defective, incorrect wiring in control panel, water in cap assembly.
Incorrect voltage, impeller or cutter blocked, negative head (discharge lower
than intake of pump). Defective “off” float. Pump runs continuously at low water
level. Low oil level in motor shell.
Air lock, debris under float assembly, defective switch, incoming sewage
exceeds capacity of pump.
Intake clogged with grease or sludge, pump air locked (clear vent hole), low or
incorrect voltage, clogged discharge line, operating near shut-off head.
Check valve stuck open or defective. Sump pit too small to handle incoming
sewage. Level control out of adjustment. Thermal overload tripping.
High water in pit. Check pump for clogging, or overload trip. On single phase
pumps, check the start capacitor in the control panel. See “A” and “D” above.
Break up solids and run pump with water running into the pit. Allow level to lower
to the pump intake. Continue until solids are cleared from the pit.
Do not drain kitchen grease down the sink.
If the above checklist does not uncover the problem, consult the factory. Do not attempt to service or otherwise disassemble pump. Service must be performed by
Zoeller Authorized Service Stations. Go to www.zoellerpumps.com/servicestations
to find the Authorized Service Station in your area.
