ZOELLER 810 Submersible Progressing Cavity Grinder Pump Owner’s Manual

ZOELLER 810 Submersible Progressing Cavity Grinder Pump

Specifications:

• Model: 810 & 815
• Product Type: Progressing Cavity Grinder Pumps
• Standards: Tested to UL 778 and CSA 22.2 No. 108

Product Information

Congratulations on purchasing a Zoeller submersible progressing cavity grinder pump. Zoeller has been a trusted name in submersible dewatering and sewage pumps since 1939. The heavy-duty design of this pump ensures high quality workmanship and easy maintenance for trouble-free service.

Safety Instructions:
To avoid serious personal injury or property damage, read and follow all safety instructions provided in this manual and on the pump. This manual is essential for the proper installation and operation of the unit.

Installation and Operation Instructions:

1. Ensure that the pump is installed according to the manufacturer’s recommendations.
2. Refer to the Pump Wiring Instructions for correct wiring procedures.
3. For outdoor prepackaged systems, follow the Typical Outdoor Prepackaged System guidelines.
4. Regular maintenance is crucial for optimal performance. Refer to the Maintenance section for details.

Maintenance:
Regular maintenance is key to ensuring the longevity and efficiency of your Zoeller pump. Follow these steps: – Check and clean the pump regularly. – Inspect for any signs of damage or wear. – Ensure proper electrical connections. – Refer to the Service Checklist for detailed maintenance tasks.

FAQ:

Q: What should I do if I encounter any issues with my Zoeller pump?
A: If you experience any problems with your pump, refer to the Owner’s Manual for troubleshooting tips. If the issue persists, contact Zoeller Pump Company for assistance.

Register your Zoeller Pump Company Product on our website: http://reg.zoellerpumps.com/.

The product information presented here reflects conditions at the time of publication. Consult the factory regarding discrepancies or inconsistencies.

MODELS 810 & 815 PROGRESSING CAVITY GRINDER PUMPS
Congratulations on the purchase of a Zoeller submersible progressing cavity grinder pump. Since 1939 the name Zoeller has represented the standard for submersible dewatering and sewage pumps. The same high-quality workmanship and easy maintenance design have been incorporated into this line of heavy-duty submersible progressing cavity grinder pumps. This Zoeller pump will provide years of trouble-free service when installed according to the manufacturer’s recommendations.

This manual incorporates the installation, operation, maintenance, and service instructions into one document to aid in the ownership of a Zoeller submersible wastewater product. Please read and review this manual before installing the product. Follow the steps in this manual for a proper start-up. Many items contained within, when followed correctly, will not only ensure a long and problem-free life for the pump but also save time and money during installation. Reference FM2435 and FM2436 for replacement parts on 810 and 815 Series Progressing Cavity Grinder Pumps respectively. Should further assistance be necessary please call our Technical Service Department at 1-800-928-PUMP (7867).

Owner’s Information

Safety Instructions

TO AVOID SERIOUS OR FATAL PERSONAL INJURY OR MAJOR PROPERTY DAMAGE, READ AND FOLLOW ALL SAFETY INSTRUCTIONS IN THIS MANUAL AND ON THE PUMP.

THIS MANUAL IS INTENDED TO ASSIST IN THE INSTALLATION AND OPERATION OF THIS UNIT AND MUST BE KEPT WITH THE PUMP.

• This is a SAFETY ALERT SYMBOL. When you see this symbol on the pump or in the manual, look for one of the following signal words and be alert to the potential for personal injury or property damage.
• Warns of hazards that WILL cause serious personal injury, death, or major property damage.
• WARNING: Warns of hazards that CAN cause serious personal injury, death, or major property damage.
• WARNING: Warns of hazards that CAN cause personal injury or property damage.
• CAUTION: Warns of electrical shock hazards that can cause serious personal injury, death, or major property damage.
• Identifies any terminal which is intended for connection to an external conductor for protection against electrical shock in case of a fault, or the terminal of a protective earth (ground) electrode.
• Read the operator’s manual.
• NOTICE: INDICATES SPECIAL INSTRUCTIONS THAT ARE VERY IMPORTANT AND MUST BE FOLLOWED.

THOROUGHLY REVIEW ALL INSTRUCTIONS AND WARNINGS BEFORE PERFORMING ANY WORK ON THIS PUMP. MAINTAIN ALL SAFETY DECALS.

Limited Warranty

Manufacturer warrants, to the purchaser and subsequent owner during the warranty period, every new product to be free from defects in material and workmanship under normal use and service, when properly used and maintained, for two years from the date of purchase. Proof of purchase is required. Parts that fail within the warranty period that inspections determine to be defective in material or workmanship will be repaired, replaced, or remanufactured at the Manufacturer’s option, provided however, that by so doing we will not be obligated to replace an entire assembly, the entire mechanism or the complete unit. No allowance will be made for shipping charges, damages, labor, or other charges that may occur due to product failure, repair, or replacement.

This warranty does not apply to and there shall be no warranty for any material or product that has been disassembled without prior approval of the Manufacturer, subjected to misuse, misapplication, neglect, alteration, accident, or uncontrollable act of nature; that has not been installed, operated or maintained by Manufacturer’s installation instructions; that has been exposed to outside substances including but not limited to the following: sand, gravel, cement, mud, tar, hydrocarbons, hydrocarbon derivatives (oil, gasoline, solvents, etc.), or other abrasive or corrosive substances, wash towels or feminine sanitary products, etc. in all pumping applications. The warranty set out in the paragraph above is instead of all other warranties expressed or implied, and we do not authorize any representative or other person to assume for us any other liability in connection with our products.

Contact the Manufacturer at, 3649 Cane Run Road, Louisville, Kentucky 40211, Attention: Customer Support Department to obtain any needed repair or replacement of part(s) or additional information about our warranty. MANUFACTURER EXPRESSLY DISCLAIMS LIABILITY FOR SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES OR BREACH OF EXPRESSED OR IMPLIED WARRANTY; AND ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE AND OF MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THE EXPRESSED WARRANTY.

Some states do not allow limitations on the duration of an implied warranty, so the above limitation may not apply to you. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

In instances where property damages are incurred as a result of an alleged product failure, the property owner must retain possession of the product for investigation purposes.

Preinstallation Checklist

1. Inspect your progressing cavity grinder pump. If the unit has been damaged in shipment, contact your dealer before installing it. Do Not remove the test plugs in the cover or the motor housing.
2. Carefully read all the literature to familiarize yourself with details regarding installation and use. Retain materials for future reference.

WARNING:
SEE BELOW FOR LIST OF WARNINGS

1. Make sure the pump connection contains a ground terminal. The power cord on all Zoeller Progressing Cavity Grinder Pumps contains a green conductor for grounding to help protect you against the possibility of electric shock.
2. Make certain the electrical service is within reach of the power supply cord.
3. Make sure any panels and branch circuits are equipped with proper-size fuses and circuit breakers. An independent power circuit is recommended, sized according to the National Electrical Code, for the current shown on the grinder pump nameplate.
4. For your protection, always disconnect the power source from the grinder pump before handling. All grinder pumps must be properly grounded and wired under the “National Electrical Codes” and all local codes and ordinances.
5. Installation of electrical hardware and checking of control panels and circuits should be performed by a qualified licensed electrician.
6. Risk of electrical shock – These pumps have not been investigated for use in swimming pool areas.
7. Prop65 Warning for California residents:
   • WARNING:  Cancer and Reproductive Harm- www.P65Warning.ca.gov.

WARNING:
Progressing cavity grinder pumps are designed for pressure sewer applications. A UL-listed and CSA-certified pressure relief valve must be installed in the system to prevent excessive pressure buildup.

CAUTION
SEE BELOW FOR LIST OF CAUTIONS

1. Make sure the power source is capable of handling the electrical requirements of the grinder pump, as indicated on the nameplate.
2. A disconnect switch should be installed in the circuit bringing electrical power to the pump.
3. The progressing cavity grinder pumps are operated by variable-level float control switches. It is the responsibility of the installing party to see that float control switches will not hang up on the grinder pump or other pit peculiarities and are secured so that the grinder pump will shut off. It is recommended to use rigid pipe and fittings and the pit be at least 24″ in diameter for simplex systems and 36″ or larger in diameter for duplex systems.
4. Grinder installations should be checked yearly for debris and/or build-up which may interfere with the “ON” or “OFF” positions of variable-level float control switches. Repair and service, other than cutter assembly maintenance, should be performed by a Zoeller Authorized Service and Warranty Center or Customer Care Center only.
5. Maximum operating temperature must not exceed 130°F, (54°C).
6. Do not operate an unsubmerged progressing cavity pump. Dry pump operation may damage the hydraulic stator due to lack of lubrication. Do not run dry.
7. To ensure proper pump operation, a swing or flapper-style check valve must be installed in the pump discharge line. A faulty or non-functional check valve when combined with a pressure sewer may prevent the pump from starting.

WARNING:
Do not attempt to turn the cutter blades located on the bottom of the unit with your fingers. Use a wrench when checking or removing the cutter.

Applications

1. Zoeller Progressing Cavity Grinder Pumps are designed for grinding and pumping sanitary sewage from submersible lift stations. The pump is intended to grind and pump reasonable quantities of items normally found in sanitary sewage applications.
2. Zoeller 810 and 815 Progressing Cavity Grinder Pumps can be installed in new applications or as a replacement for another grinder of like size and capacity.
3. The 810 and 815 can be installed in a Prepackaged Job Ready System or may be used in a Field Assembled basin package. Page 5 shows a couple of the Prepackaged Systems. Field Assembled Systems are discussed on page 3.
4. Zoeller 810 and 815 Grinder Pumps can be retrofitted to existing positive displacement pump installations.

Recommended Limits of Application for Progressing Cavity Grinder Pumps

These recommended application limits are for pump stations pumping to a gravity main. Low-pressure collection systems should be designed with a pump located at each house. For applications where a lift station would handle more than 2 homes, consider the 840 or 71 Series grinder pump. For applications where a lift station would handle more than 60 homes, a solids-handling type pump should be considered.

General Information

PROGRESSING CAVITY GRINDER PUMP DESCRIPTION

1. Pumps are constructed of cast iron protected with powder-coated epoxy for long life when pumping sewage in submersible applications. The cutter assembly is comprised of stainless steel components hardened to a value of 55- 60 on the Rockwell C scale; a star-shaped cutter and a precision ground flat disk. Cutting action takes place with the rotation of the cutter blades at 1750 RPM against the stationary cutter plate (see page 7).
2. The cutter mechanism on the models 810 & 815 is single-directional.
3. Pump motors are single-phase. Single-phase motors require a run capacitor, which is mounted in the upper cap of the pump (ref. page 4). The units have an internal thermal overload.
4. The 810 & 815 progressing cavity grinder pumps are single seals.
5. The pressure relief valve provides motor protection under inadvertent shut-off head conditions.
6. A progressing cavity grinder pump is an intermittent-duty pump designed for pumping sanitary sewage. It is not a dewatering or trash pump.

FIELD ASSEMBLED INSTALLATION

1. Installation and piping instructions are included with the control panel, rail system, and basin instructions. If the pump is being retrofitted to an existing rail system, accessory parts may be required. Consult the factory and advise the make and model of the rail system being used.
2. Refer to the appropriate Indoor/Outdoor prepackaged instructions for more information on system installation.
3. All electrical connections including the pump to the control box and power supply to control panels must comply with the “National Electrical Code” and applicable local codes. Conduit and panel enclosure openings must have a gas-tight seal. Installation of electrical panels and connections should be made by a qualified licensed electrician.
4. A properly sized disconnect switch, supplied by others, shall be installed on the service side of the pump and control panel.
5. When used in a pressure sewer, install an anti-siphon valve (see Fig. 5A).

Pump Wiring Instructions

• WARNING: FOR YOUR PROTECTION, ALWAYS DISCONNECT THE PUMP FROM ITS POWER SOURCE BEFORE HANDLING.
• WARNING: All electrical connections must be wired and grounded by the National Electrical Code and all applicable local codes and ordinances.
• WARNING: “Risk of electrical shock” Do not remove the power supply cord and strain relief or connect the conduit directly to the pump.
• WARNING: Installation and checking of electrical circuits and hardware should be performed by a qualified licensed electrician.

FIGURE 2. Pump Control Switch Installation

Determining Pumping Range in Inches (1 inch – 2.5 cm)

• Tether Length (inches) 5min. 10max.
• Pumping Range (GPM) 9 13.5

Use only as a guide. Due to the weight of the cable, the pumping range above the horizontal is not equal to the pumping range below the horizontal. Ranges are based on testing in nonturbulent conditions. Range may vary due to water temperature and cord shape. As tether length increases, so does the variance of the pumping range.

• Note: Failure to keep within proper tether limits may prevent reliable switch operation.
• Note: The cable must be mounted in a horizontal position.

Use the diagram above to secure the float switch properly and obtain the proper tether to customize the on-off cycle for each application. Note the minimum off-level shown above. On Prepackaged Systems, the tether length is set at 5”.

Electrical Data

• Line-to-line reading from the electrical load will only reflect the run winding resistance. Start winding resistance can only be measured after removing the cover.
• Start & run winding resistance can only be measured after removing the cover and checking at the through-wall terminals.

FIGURE 3A. Models E810 and E815 Wiring Diagram

FIGURE 3B. Models RE810 and RE815 Wiring Diagram (932 Replacement Grinder Assembly w/ Manual Run)

FIGURE 3C. Models RWD810 and RWD815 Wiring Diagram (932 Replacement Grinder Assembly w/Integral Pump and Alarm Float w/Manual Run)

Typical Outdoor Grinder Pumping System Installations

FIGURE 4A – PACKAGED SYSTEM WITH FLEXIBLE HOSE DISCONNECT

FIGURE 4B – PACKAGED SYSTEM WITH Z-RAIL® DISCONNECT SYSTEM

FIGURE 5

FIGURE 5A

All installations must comply with all applicable electrical and plumbing codes, including but not limited to the National Electrical Code, local, regional, and/or state plumbing codes, etc.

Outdoor Prepackaged System Installation Instructions

Notice
This set of instructions is for factory-prepackaged outdoor progressing cavity grinder systems only. If this is a field-assembled outdoor system you can use these instructions as a guideline.

1. Review the drawing in Fig. 4 on page 5 and the actual system to become familiar with the components in the packaged grinder pump system. Review where the unit will be installed. Determine where the power feed, inlet pipe, and discharge pipe will be located.

2. Remove the unit from packing. Prepackaged outdoor systems are preassembled at the Zoeller Company and require a minimum of field assembly work. Float switches are set and tethered for proper operation from the Factory. The alarm switch should be located 2” above the pump “on” level.

3. Float switches are tied in place for shipping purposes on all model-prepackaged systems. Cut the cable tie around each float switch bulb or the unit will not operate properly. Verify that where the float switches are set will work for your application. Verifying that the float switches are set properly and will not hang up inside the basin is the responsibility of the installing contractor.

4. Dig a hole for the basin. The hole should be at least 24” larger in diameter than the basin diameter to provide 12” of backfill all around and deep enough to provide either 12” of compacted backfill or 6” when a concrete pad is required. Ensure the removable cover extends above the finished grade line and the grade slopes away from the unit. Backfill and subbase should be 1/8”
   – 3/4” pea gravel or 1/8” –1/2” crushed stone. (Reference basin installation instructions included with the unit)

5. Note: Care must be taken when excavating to avoid underground utilities and disturbance of existing structure foundations. The hole should be located at least ten feet from adjacent structures. Additional distance may be required to sufficiently locate the basin outside of the loading area of the adjacent structures.

6. The location of the inlet fitting is determined by the depth of the inlet pipe. The inlet fitting must be used with a 4” pipe. It is best to install the inlet on the side of the basin opposite the float switches. To install, use a 5” hole saw to drill into the side of the basin at the correct elevation. Center the hub’s inner diameter with the hole in the basin. Attach the hub to the side of the basin using the sealant and hardware provided.

7. The bottom of the excavation can now be backfilled and compacted. Set the basin in the hole and connect the 4” inlet pipe to the inlet hub.

8. The discharge piping is connected to the 1-1/4” threaded fitting located in the basin sidewall.

9. Connect the pull rod to the Pump assembly. Connect the lift cable to the top of the pump. Lower the pump into the basin ensuring the discharge pipe bracket slides into the disconnect fitting.

10. Pouring a concrete anchor around the system can now be completed. The basin should be filled with water when pouring concrete to minimize movement of the system. Backfill around the basin with specified media. Care should be used to avoid damaging components or leaving voids when backfilling. Refer to the Basin installation reference guide for more specific requirements.

11. Note: The progressing cavity grinder basin is a sewage holding tank. Vent connection should be installed under all national, state, and local plumbing codes.

12. Dig a trench for the electrical conduit. The trench should be located at least 18” deep and follow all applicable NEC codes. Connect electrical wiring to the Junction box according to the wiring instructions included in this manual and the wiring diagram in the box. Use the potting kit provided with the junction box. Use the included sealant when closing the junction box.

13. If used, a control panel is installed within sight of the system. Connect float switches and pump cords according to the “Pump Wiring Instructions” found in this manual and located inside the panel enclosure.

14. Remove any debris from the basin. Using clean water, check the system for proper operation.

15. Seal and secure the lid using the proper bolts and sealant when using a lid without a formed gasket.

16. Add water to the basin and test the system for leaks and proper pump operation.

17. Record system start-up data for future reference.

Operation

GENERAL

• Zoeller pumps are lubricated and tested at the factory before shipment and require minimum pre-start-up maintenance.
• The maximum operating temperature of pump liquid for grinder pumps must not exceed 130°F (54°C).
• These units are not designed to handle liquids other than sanitary sewage. If the pump is used to dewater areas with contaminated liquids with heavy or abrasive materials, the warranty will be voided.

NAMEPLATE DATA
The nameplate, located on the top of the pump, indicates specific information about the construction of the pump. The model number and date code information should be recorded on the front page in the “Owner’s Information” section of this manual.

SHORT TERM STORAGE
When not in use, the pump should be stored and the following is advised:

• Drain pump housing by laying pump horizontal with discharge down. Then stand the pump on the legs.
• Store the pump inside whenever possible or cover it with some type of protective covering.
• Tape or seal in a plastic bag the terminal ends of wire leads.
• Spray coat unpainted surfaces with rust-inhibiting oil.
• The impeller should be rotated every six months to keep the seal lubricated and not develop a permanent set.

If the panel is to be stored, the following is advised:

• Store the panel inside whenever possible and leave it in the shipping box.
• All openings shall be sealed.
• Store in an upright position.
• Do not stack anything on top of the panel.

START-UP PROCEDURE
Before placing the equipment into operation the following should be checked:

• Clean pit.
• Electrical boxes are dry and securely installed.
• Floats positioned properly.
• Discharge valves open.
• Adequate water level in the basin for pump submersion.

Once the above has been verified proceed with the following checks:

• Pump power cables and control floats are properly installed and voltage verified.
• Conduit connections to the panel are properly sealed.
• After installing the pump into the basin, with adequate submergence, open the discharge valve fully. Start the unit using manual controls. If the flow is appreciably less than the rated performance, the pump may be air-locked. To expel trapped air, jog the unit several times, using the manual controls.
• Have a qualified electrician take voltage and current measurements with the pump running. Record these readings in the space provided in the “Owner’s Information” section on page 1 of this manual for future reference.

ADJUSTMENT PROCEDURE

• Pumps: No adjustments are required.
• Floats: Refer to the system drawing or to the panel wiring schematic for the desired location of each float switch setting. The off switch should deactivate the pump before the water level drops to the mid-point of the pump.
• Valves: Discharge valves should be placed in the fully open position. Systems should not be operated for extended periods with the discharge valves partially closed due to damaging the valve. Check for an antisiphon valve when used in a pressure sewer.

SHUTDOWN PROCEDURES
If a system is shutdown for more than six months, the following is recommended:

• Pumps: If the pit is to remain dry, then the pump can remain in the pit. Do not run dry. If the pit is to remain wet, the pump should be removed and stored as noted above.
• Panels: The panel should have all openings sealed to prevent moisture and dust from entering the enclosure. Before restarting the system, the panel should be inspected for the presence of moisture and any loose connections.
• Valves: Consult the valve/actuator supplier for information concerning these system’s components.

Maintenance

Cutter Maintenance

1. All power circuits must be disconnected and locked out before any attempts are made at servicing. The cutter and disc can be removed and sharpened by grinding the cutting faces. Both the cutter and disc must be removed from the pump. Removal of these parts can be accomplished in the field by removing the pump from the sump and positioning it horizontally to access the intake of the pump. If seals or other repairs are required, the pump must be removed and serviced in a shop by a qualified pump technician or authorized service center.
2. Thoroughly clean the cutter and disc assembly. Tilt the pump back to the vertical position to make certain the end play has been removed. Check and record the clearance between the cutter and disc with a feeler gauge. The correct running clearance is between 0.007″ and 0.012″.
3. With the pump in a horizontal position, heat the hex head bolt in the center of the cutter with a propane torch. The bolt must be heated to 350° F to soften the thread lock sealer on the bolt for ease of removal. Remove the bolt by turning it in a counterclockwise rotation. It will be necessary to use a wood block to prevent the cutter from turning while removing the bolt. Pull the cutter from the shaft and remove the spacer shims located behind the cutter.
4. Remove the six cap screws holding the disc and remove the disc from the pump.
5. The disc and cutter can be replaced with new service parts or resurfaced by grinding. Resurfacing is accomplished by surface grinding both disc and cutter to a 32-micro finish. Do not attempt grinding in the field. Send parts to a qualified machine shop for repair. The disc, cutter, and shims are a matched set. Keep parts together. Measure the disc before and after resurfacing with a micrometer and record measurements.
6. After resurfacing, the disc and cutter must be flat within 0.001″. If the disc has been surface ground, it will be necessary to remove shims to compensate for the material removed from the disc. As a starting point, remove shims of the same thickness as the amount machined from the cutter disc (step 6 above). Final running clearance must be between 0.007″ and 0.012″. Be sure the pump is in a vertical position and all end play has been removed before measuring.
7. Clean the bottom of the pump where the disc is located and replace the disc and retainer screws. Torque to 63-67 in-lbs. Replace the cutter with the correct shims. Install washer and torque hex head bolt to 71-75 in.-lbs. apply Loctite 262 thread-lock sealant or equal to bolt threads before insertion. Check running clearance with the pump in a vertical position to remove end play. Clearance must be between 0.007″ and 0.012″ to obtain efficient grinding when the pump is put back in service.
8. Check the oil in the motor housing before reinstalling. Contact the factory if the oil has a milky appearance or burnt smell. The level should be even with the fill plug when the pump is in the upright position. Add oil if required. Use insulating oil supplied by the factory.

To remove the cutter: Heat the center bolt to 350 °F to loosen the Loctite® thread sealant.

Grind the Cutter and Disc seen here to a 32 microfinish. Surfaces must be flat to within 0.001″ T.I.R. Gap must be between 0.007″ and 0.012″ on these parts.

General Maintenance

Notice:
Repair and service should be performed by a Zoeller Authorized Service & Warranty Center or Customer Care Center only.

SAFETY PROCEDURES

• WARNING: For your protection, always disconnect the pump and panel from its power source before handling.
• WARNING: Never enter the basin until it has been properly vented and tested. Any person entering a basin should be wearing a harness with a 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.

• The pump is never to be lifted by the power cord.
• Unit must be cleaned and disinfected, inside the pumping chamber and all exterior surfaces, before servicing.

GENERAL SYSTEM INSPECTION
Before the system is placed into operation, it should be inspected by a qualified technician.

Wiring and grounding must be by 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 the short-term storage procedure in the Operation section.

PREVENTIVE MAINTENANCE
Preventive maintenance is recommended to ensure a long service life for the product. Provided is a suggested maintenance schedule.

Every year:

• Inspect the basin, and report any sighting of grease accumulation.
• Check for proper and unobstructed float operation.
• Listen for proper check valve operation.

Every 8 years or 2,000 hours of operation:

• Remove pump, inspect, and service using a Zoeller rebuild kit.
• Flush and clean the basin.

Service Checklist

WARNING

• Electrical precautions. Before servicing a grinder pump, always shut off the main power circuit. Make sure you are wearing insulated protective shoes and not standing in water. Under flooded conditions, contact your local electric company or a qualified licensed electrician to disconnect electrical service to the pump before removal.
• Grinder pumps contain oil that becomes pressurized and hot under operating conditions. Allow 2-1/2 hours after shutdown before servicing the pump.

voltage, thermal overload open, defective capacitor circuit, cutter clogged, damaged hydraulic stator or rotor, float switch held down or defective, incorrect wiring in control panel, water in cap assembly, check valve not installed or malfunctioning.
B. Motor overheats and trips on overload.| Incorrect voltage, hydraulic rotor or cutter blocked, negative head (discharge lower than intake of the pump). Defective “off” float. The pump runs continuously at a low water level. Low oil level in the motor shell. The pump running at the shut-off head, check valve is not installed or is malfunctioning.
C. Pump will not shut off.| Debris under float assembly, defective switch, and incoming sewage exceeds the capacity of the pump.
D. Pump operates but delivers little or no water.| Intake clogged with grease or sludge, damaged hydraulic stator or rotor, low or incorrect voltage, clogged discharge line, operating near shut-off head.
E. Pump starts and stops too often.| The check valve is stuck open or defective. The pump pit is too small to handle incoming sewage. Level control out of adjustment. Thermal overload tripping.
F. Large red flashing light comes on at the control box.| High water in the pit. Check pump for clogging, or overload trips.
G. Grease and solids accumulate in the pit around the pump.| Break up solids and run the pump with water running into the pit. Allow the 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 reveal the problem, consult the Product Support Department. Do not attempt to service or otherwise disassemble the pump. Service must be performed by a Zoeller Authorized Service Station. Go to https://www.zoellerpumps.com/en-us/where-to-buy/service-locator to find the Zoeller Authorized Service & Warranty Center or Customer Care Center in your area.

• MAIL TO: P.O. BOX 16347 • Louisville, KY 40256-0347
• SHIP TO: 3649 Cane Run Road • Louisville, KY 40211-1961
• Tel: 502-778-2731 • 1 (800) 928-PUMP
• Visit our website: zoellerpumps.com.

© Copyright 2024 Zoeller® Co. All rights reserved.

References

• » Zoeller Pump Company Product Registration
• Zoeller Pump Company | Wastewater Pumps and Systems

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