Sundyne LMV-313 - User Manual

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SUNDYNE

LMV-313 PUMPS

Instruction and Operation

Manual

August 2007

Main Page

Questions and Answers

L
Laurie WilliamsAug 17, 2025
Why does my Sundyne LMV-313 have insufficient total head?
- C
  Casey EdwardsAug 18, 2025
  If your Sundyne Water Pump has insufficient total head, several factors could be responsible. The flow might be too high or too low, so check the total head and flow rate against the performance curve, and increase through-flow rate or bypass part of pump discharge to supply tank if the flow is too low. Ensure the driver shaft rotation direction matches the arrow on the pump casing, noting that the impeller and driver rotate in the same direction. Also, the NPSH might be lower than required, so refer to the solutions listed under “No flow, no pressure at start-up”. For high flow models (313/333/343/348), excess clearance at the impeller face could be the issue, requiring disassembly and a clearance check.
L
Lauren RichardsOct 31, 2025
What to do if Sundyne LMV-313 has no flow, no pressure at start-up?
- S
  Scott DouglasOct 31, 2025
  If your Sundyne Water Pump shows no flow or pressure at start-up, there are several potential causes. First, ensure the pump is completely filled with liquid; bleed any vapor or air from port 6 and allow more cool-down time if pumping low-temperature fluid. Also, check the suction line for air leaks if the suction pressure is lower than atmospheric. It's also possible that the NPSH is actually lower than the requirement, in this case, check for a blocked suction line, excessive pressure drop through suction piping, vapor pockets in the suction line, low suction tank level or pressure, or entrained air in the fluid. Another cause may be failure of a drive component, requiring disassembly and inspection. Finally, verify the correct direction of rotation of the driver shaft, which must match ...

Summary

Introduction and Safety

Equipment and Safety Precautions

Outlines essential safety measures for equipment handling and personnel protection.

Installation

Suction and Discharge Piping

Best practices for installing and maintaining pump suction and discharge piping systems.

Diffuser Cavity Vent

Instructions on maintaining the diffuser cavity vent for safe operation and hazard prevention.

Seal Environmental Control System

Details on installing and maintaining seal environmental control systems for pump operation.

Liquid Buffer System

Explanation of the liquid buffer system used for double liquid seals and tandem liquid seals.

Mounting Vertical Units Without Stands

Guidance on mounting vertical units without dedicated stands onto a foundation.

Mounting Vertical Units with Stands (LMV)

Procedures for grouting and leveling base plates for vertical units with stands.

Base Mounted (BMP) Units

Instructions for grouting and leveling base plates for base-mounted units.

Driver and Coupling

Flexible Coupling for LMV Units Without a Vertical Stand

Lube System

Gearbox Heat Exchanger

Oil Manifolds

Remote Heat Exchanger

Gearbox Sump

SundGard Oil Filter

Main Lube Pump and Lube Oil Priming Kit

Commissioning, Start Up, & Operation

Pre-Commissioning

Steps to familiarize with the pump, check auxiliaries, and ensure proper connections before operation.

Pre-Start Up

Procedures for pressurizing the fluid loop, servicing the gearbox, and setting valves before initial operation.

Operating Conditions

Verifying operating parameters against specifications and adjusting cooling flow for optimal temperature.

Installation and Start-Up Checklist

Start-Up Procedures

Controlling the Pump During Startup

Single Operation

Operation of Sundyne Pumps

Suction Conditions

Minimum Flow Conditions

Entrained Gases

System Head Curve

Parallel Operation

Maintenance

Disassembly of LMV-313

Detailed step-by-step instructions for disassembling the LMV-313 pump.

Inspection and Cleaning and Repair

Inspecting All Bearings

High Speed Shaft

Gearbox Mechanical Seal

Upper Shaft Sleeve

Bearing and Shaft Clearances

Pump Assembly and Clearance Adjustments

General Clearance Adjustment Information

Impeller Spacer Adjustments

Inducer Housing Shim Adjustments

Procedure for Checking the High-Speed Shaft Endplay and Shoulder Height

Gearbox and Pump Torque Values

Reassembling the LMV-313

Troubleshooting

Gearbox & Pump Diagnostics

Table of common symptoms, possible causes, and corrective actions for gearbox and pump issues.

Pump Mechanical Seal Diagnostics

Summary

Introduction and Safety

Equipment and Safety Precautions

Outlines essential safety measures for equipment handling and personnel protection.

Installation

Suction and Discharge Piping

Best practices for installing and maintaining pump suction and discharge piping systems.

Diffuser Cavity Vent

Instructions on maintaining the diffuser cavity vent for safe operation and hazard prevention.

Seal Environmental Control System

Details on installing and maintaining seal environmental control systems for pump operation.

Liquid Buffer System

Explanation of the liquid buffer system used for double liquid seals and tandem liquid seals.

Mounting Vertical Units Without Stands

Guidance on mounting vertical units without dedicated stands onto a foundation.

Mounting Vertical Units with Stands (LMV)

Procedures for grouting and leveling base plates for vertical units with stands.

Base Mounted (BMP) Units

Instructions for grouting and leveling base plates for base-mounted units.

Driver and Coupling

Flexible Coupling for LMV Units Without a Vertical Stand

Lube System

Gearbox Heat Exchanger

Oil Manifolds

Remote Heat Exchanger

Gearbox Sump

SundGard Oil Filter

Main Lube Pump and Lube Oil Priming Kit

Commissioning, Start Up, & Operation

Pre-Commissioning

Steps to familiarize with the pump, check auxiliaries, and ensure proper connections before operation.

Pre-Start Up

Procedures for pressurizing the fluid loop, servicing the gearbox, and setting valves before initial operation.

Operating Conditions

Verifying operating parameters against specifications and adjusting cooling flow for optimal temperature.

Installation and Start-Up Checklist

Start-Up Procedures

Controlling the Pump During Startup

Single Operation

Operation of Sundyne Pumps

Suction Conditions

Minimum Flow Conditions

Entrained Gases

System Head Curve

Parallel Operation

Maintenance

Disassembly of LMV-313

Detailed step-by-step instructions for disassembling the LMV-313 pump.

Inspection and Cleaning and Repair

Inspecting All Bearings

High Speed Shaft

Gearbox Mechanical Seal

Upper Shaft Sleeve

Bearing and Shaft Clearances

Pump Assembly and Clearance Adjustments

General Clearance Adjustment Information

Impeller Spacer Adjustments

Inducer Housing Shim Adjustments

Procedure for Checking the High-Speed Shaft Endplay and Shoulder Height

Gearbox and Pump Torque Values

Reassembling the LMV-313

Troubleshooting

Gearbox & Pump Diagnostics

Table of common symptoms, possible causes, and corrective actions for gearbox and pump issues.

Pump Mechanical Seal Diagnostics

Sundyne LMV-313 Specifications

General

Brand	Sundyne
Model	LMV-313
Category	Water Pump
Language	English

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Sundyne LMV-313 - User Manual

Table of Contents

Questions and Answers

Summary

Introduction and Safety

Equipment and Safety Precautions

Installation

Suction and Discharge Piping

Diffuser Cavity Vent

Seal Environmental Control System

Liquid Buffer System

Mounting Vertical Units Without Stands

Mounting Vertical Units with Stands (LMV)

Base Mounted (BMP) Units

Driver and Coupling

Flexible Coupling for LMV Units Without a Vertical Stand

Lube System

Gearbox Heat Exchanger

Oil Manifolds

Remote Heat Exchanger

Gearbox Sump

SundGard Oil Filter

Main Lube Pump and Lube Oil Priming Kit

Commissioning, Start Up, & Operation

Pre-Commissioning

Pre-Start Up

Operating Conditions

Installation and Start-Up Checklist

Start-Up Procedures

Controlling the Pump During Startup

Single Operation

Operation of Sundyne Pumps

Suction Conditions

Minimum Flow Conditions

Entrained Gases

System Head Curve

Parallel Operation

Maintenance

Disassembly of LMV-313

Inspection and Cleaning and Repair

Inspecting All Bearings

High Speed Shaft

Gearbox Mechanical Seal

Upper Shaft Sleeve

Bearing and Shaft Clearances

Pump Assembly and Clearance Adjustments

General Clearance Adjustment Information

Impeller Spacer Adjustments

Inducer Housing Shim Adjustments

Procedure for Checking the High-Speed Shaft Endplay and Shoulder Height

Gearbox and Pump Torque Values

Reassembling the LMV-313

Troubleshooting

Gearbox & Pump Diagnostics

Pump Mechanical Seal Diagnostics

Summary

Introduction and Safety

Equipment and Safety Precautions

Installation

Suction and Discharge Piping

Diffuser Cavity Vent

Seal Environmental Control System

Liquid Buffer System

Mounting Vertical Units Without Stands

Mounting Vertical Units with Stands (LMV)

Base Mounted (BMP) Units

Driver and Coupling

Flexible Coupling for LMV Units Without a Vertical Stand

Lube System

Gearbox Heat Exchanger

Oil Manifolds

Remote Heat Exchanger

Gearbox Sump

SundGard Oil Filter

Main Lube Pump and Lube Oil Priming Kit

Commissioning, Start Up, & Operation

Pre-Commissioning

Pre-Start Up

Operating Conditions

Installation and Start-Up Checklist