Tsurumi Pump LB Series

Other manuals for Tsurumi Pump LB Series

Starting And Operating Instruction58 pages

Starting And Operating Instructions44 pages

Questions and Answers

L
Lauren ShannonJul 27, 2025
Why does my Tsurumi Pump LB start but stop?
- D
  Danielle JohnsonJul 27, 2025
  If your Tsurumi Pump Water Pump starts but then stops, several factors could be at play. The motor windings or cable might be damaged, so check them. An impeller could be blocked or choked. Also, wrong voltage or frequency could be the reason. Check the voltage under load if it seems too low. If a generating set provides power, the frequency may be inexact. Excessive viscosity or density of the liquid could also be the reason. Finally, there might be a wrong setting or thermal overload at the power source.
J
Joseph NewtonJul 31, 2025
How to troubleshoot a Tsurumi Pump LB Water Pump that fails to start?
- B
  browndeanJul 31, 2025
  If your Tsurumi Pump Water Pump fails to start, there are a few things to check. If a level control exists, ensure it's calling for the pump to start. Use a multimeter, portable lamp, or electric tool to verify power availability. Remove the pump casing and confirm that the impeller rotates freely and without noise. At the pump cable's end, check the insulation value of the earth lead (it should be over 20 M Ohm) and the winding's continuity.
G
gerald91Aug 5, 2025
What to do if Tsurumi Pump LB head and flow are lower than expected?
- J
  johnsonlisaAug 5, 2025
  If your Tsurumi Pump Water Pump's head and flow are lower than originally, several issues could be responsible. There might be a restriction in the piping or excessive resistance in the discharge conduit (perhaps it's too high, too long, too small, or dirty inside). The impeller could be worn, partially choked, or severely narrowed by hard deposits. The strainer or inlet might be blocked, or the pump could be drawing air. Also, the liquid might be partly volatile or contain a high level of gas in solution.
A
Amber ReillyAug 9, 2025
Why does my Tsurumi Pump LB generate noise or vibration?
- M
  Michael HansenAug 9, 2025
  If your Tsurumi Pump Water Pump generates unusual noise or vibration, it could be due to a few reasons. The impeller might be severely damaged, or a bearing could be failing. Repair it at once. Also, check that the pump isn't lying on its side and drawing air. This could also indicate a high wear rate.
J
Jason HernandezAug 13, 2025
What to do if my Tsurumi Pump Water Pump starts but then stops?
- T
  Thomas RubioAug 13, 2025
  If your Tsurumi Pump Water Pump starts but then stops, it could be due to several reasons. The motor windings or cable might be damaged. The impeller could be blocked or choked. There might be an issue with the voltage or frequency, such as the voltage being too low, especially under load, or an inexact frequency if using a generating set. Additionally, the liquid might have excessive viscosity or density, or there could be a wrong setting or thermal overload at the power source. Do not open the motor; instead, check the items mentioned above.
C
Christopher LopezAug 17, 2025
Why is the head and flow of my Tsurumi Pump Water Pump lower than originally?
- D
  David RamirezAug 17, 2025
  If your Tsurumi Pump Water Pump's head and flow are lower than originally, it could be due to a restriction in the piping or resistance in the discharge conduit because it is too high, too long, too small, or too dirty inside. Alternatively, the impeller might be worn, partially choked, or severely narrowed by hard deposits. Another possibility is that the strainer or inlet is blocked. The pump could also be drawing air, or the liquid is partly volatile or contains a high level of gas in solution.
B
Benjamin PhelpsAug 22, 2025
What to do if Tsurumi Pump LB Water Pump fails to start?
- C
  Cassandra NguyenAug 22, 2025
  If your Tsurumi Pump Water Pump fails to start, and if the pump is new or has been repaired and tested, check whether the level control is calling for the pump to start. Use a multimeter, portable lamp, or electric tool to check if power is available. Remove the pump casing and ensure the impeller can rotate freely and without noise. At the pump cable's end (never open the motor), check the insulation value of the earth lead (over 20 M Ohm) and the continuity of the winding. If the pump has been used satisfactorily before, pay special attention to the impeller, checking for stones or debris.

Summary

Electrical Testing

Inspect Pump Discharge

Inspect Pump Casing

Inspect Oil Chamber

Inspect;Remove Mechanical Seal

Remove Oil Casing

Remove the oil casing from the motor frame using hex bits, noting that oil will leak out.

Inspect Oil Casing, Seals, and Lifter

Inspect oil casing, O-ring, oil lifter, and mechanical seal for debris, damage, or wear.

Remove Oil Lifter

Lift the press-fit oil lifter from the oil casing to allow removal of the stationary mechanical seal.

Remove Lower Stationary Seal

Carefully tap the lower stationary seal out of the casing onto a soft surface.

Remove Lower Rotary Seal (Impeller Side)

Pry the upper portion of the rotary seal and spring from the impeller side using screwdrivers.

Remove Upper Rotary Seal (Motor Side)

Remove the upper seal from the motor side after the lower seal and spring are removed.

Motor Inspection

Test Capacitor

Test capacitor capacitance using a multimeter, ensuring it's within 5% of the stated value.

Inspect Rotor, Stator, and Bearings

Pull out the rotor assembly and inspect stator for burning or wetness; clean if necessary.

Replace Bearings

Check bearings for wobble or roughness; use a puller and press bearings onto the shaft correctly.

Pump Reassembly

Layout Mechanical Seal for Proper Placement

Reassemble Stationary Seals

Reassemble Motor

Secure Motor Assembly

Reassemble Rotary Seals

Reassemble Oil Casing

Reassemble Wet End

Reassemble Outer Cover

Reassemble Top End

Air Tightness Test Oil Casing

Fill With New Oil

Perform Run Test

Connect to power, check for normal operation, humming sound, and pushing air.

Tsurumi Pump LB Series Specifications

General

Model	LB Series
Power Supply	Single-phase or Three-phase
Type	Submersible Pump
Motor Power	0.4 kW to 3.7 kW
Discharge Bore	50 mm to 100 mm
Motor Protection	Thermal overload protection
Impeller	Semi-open type
Application	Drainage
Outlet Size	2 inch, 3 inch (depending on model)