Weir ROTO-JET RG - User Manual

Questions and Answers

C
Charles BentonAug 25, 2025
Why does my Weir Water Pump overload the driver?
- J
  Jacob GutierrezAug 26, 2025
  A Weir Water Pump overloading its driver can stem from several causes. The speed may be too high, so verify the driver's size for the required speed. A specific gravity that is too high can cause overloading. If the head is lower than the rating, the pump might be pumping too much liquid; in this case, throttle the pump at the discharge to reduce flow. High viscosity can also create high drag on the rotor, rotor cover, and pick-up tube. Lastly, electrical defects, such as incorrect voltage or frequency, or poor motor ventilation, can contribute to the issue.
C
Craig CummingsAug 31, 2025
How to fix overheating or rapidly wearing Weir ROTO-JET RG Water Pump bearings?
- Z
  Zachary TaylorAug 31, 2025
  Overheating or rapid wear in Weir Water Pump bearings can be attributed to several factors. Ensure proper lubrication and bearing pre-load, verifying correct bearing installation and oil ring placement. Excessive vibration can also cause bearing issues. Dirt or water in the bearings can be a problem; dismantle the pump, clean the bearing housing, replace the bearings, and lubricate. Bearings that are too tight, potentially due to V-belt tension, can also lead to overheating. Lastly, high suction pressure, differing significantly from specifications, might contribute to the problem.
A
awalkerSep 3, 2025
Why does my Weir ROTO-JET RG work for a while then quit?
- S
  Shane SmithSep 4, 2025
  If your Weir Water Pump operates for a while and then stops, several issues could be the cause. Incomplete priming might be the problem; ensure the pump, piping, and valves are free of air, correcting any high points in the suction line that prevent this. A suction lift that's too high can also cause this; check for pipe friction losses and measure the static lift, raising the liquid or lowering the pump if needed. Air leaks in the suction line can lead to the pump quitting; test the line under pressure to identify leaks. Air or gases in the liquid can also cause intermittent operation; consider a gas separation chamber. Lastly, mechanical failure of critical pump parts, such as damaged bearings or pick-up tube, could be the reason.
M
megansmithSep 6, 2025
Why is there excessive noise coming from my Weir Water Pump?
- J
  Julie ParkerSep 6, 2025
  Excessive noise from your Weir Water Pump can stem from several sources. Vibration is a common cause. Inlet cavitation due to insufficient NPSH can also generate noise; increase inlet pressure, reduce pipe friction losses, increase the height of the suction vessel, pressurize the suction vessel or lower the pump. Discharge cavitation can be another cause; decrease flow requirements or increase pump discharge pressure. Slipping belts can produce noise; adjust or replace them. Finally, turbulence in discharge piping can contribute to noise; fully open the discharge valve, increase the pipe diameter, or eliminate sharp bends in the piping.
T
tamarascottSep 10, 2025
What does it mean if liquid runs from the drain hole of my Weir ROTO-JET RG Water Pump?
- D
  Deborah DanielSep 12, 2025
  If liquid is running from the drain hole of your Weir Water Pump, it typically indicates a seal leak or leakage past o-rings. Dismantle the pump and inspect the seal faces, replacing them if necessary. Also, inspect the o-ring grooves and o-rings, cleaning and replacing parts as needed.
S
Shelby BrennanNov 13, 2025
What to do if my Weir Water Pump delivers no liquid?
- M
  mcdanielelizabethNov 14, 2025
  If your Weir Water Pump isn't delivering liquid, several factors could be at play. First, ensure all inlet and discharge valves are fully opened. Check for a lack of prime by filling the pump and suction completely with liquid, and inspect for vapor bind. Obstructions in liquid passages can also be a culprit; dismantle the pump to inspect the pick-up tube, rotor cover, and manifold, removing any obstructions. The system head might be too high, exceeding the pump's design; check pipe friction losses and consider larger piping or increasing pump speed. A suction lift that's too high can also cause this issue; measure it with a mercury column or vacuum gauge, and if it's excessive, raise the liquid or lower the pump. Additionally, check for air leaks in the suction line by pressurizing it and...
E
Eddie BarajasNov 17, 2025
Why is my Weir ROTO-JET RG not delivering enough liquid?
- E
  Edward KingNov 17, 2025
  If your Weir Water Pump isn't delivering enough liquid, there could be several reasons. Check for air leaks in the suction line by testing it under pressure. Ensure the pump speed isn't too low by checking belt tension and drive sheave size, and verify the motor is receiving full voltage. Confirm the pump's rotation is correct. Inspect for obstructions in the liquid passages by dismantling the pump and checking the pick-up tube, rotor cover, and manifold. The discharge head might be too high; check pipe friction losses and consider larger piping or increasing pump speed. A suction lift that's too high can also cause this; measure it and raise the liquid or lower the pump if needed. Check for partially plugged suction or discharge lines and unplug them. Finally, inlet cavitation due to insu...
F
flowerspaigeNov 20, 2025
What causes Weir Water Pump vibration?
- J
  joshua44Nov 20, 2025
  Several factors can cause vibration in your Weir Water Pump. Inlet cavitation due to insufficient NPSH can be a cause; try increasing inlet pressure, reducing pipe friction losses, increasing the height of the suction vessel, pressurizing the suction vessel, or lowering the pump. Air or gases in the liquid can also lead to vibration; consider a gas separation chamber. Check for misalignment and adjust the tension of V-belts. Mechanical failure of pump parts, such as damaged bearings or pick-up tube, can also cause vibration. Obstructions in liquid passages may be a factor; dismantle the pump and inspect the pick-up tube, rotor cover, and manifold. Ensure the foundation is rigid enough to support the pump and prevent vibration. Foreign particles in the rotor or erosion of the rotor can crea...
W
Wanda MooreNov 26, 2025
What to do if my Weir Water Pump has not enough pressure on pressure gauge?
- M
  michael72Nov 27, 2025
  If your Weir Water Pump isn't showing enough pressure on the pressure gauge, several issues might be responsible. Ensure there's no restriction on the pump discharge by closing the valve on the discharge side at start-up. Check if the pump speed is too low by inspecting belt tension and drive sheave size, and verify the motor is receiving full voltage. Confirm the pump's rotation is correct. Inspect for obstructions in the liquid passages by dismantling the pump and checking the pick-up tube, rotor cover, and manifold. Look for air leaks in the suction line by testing it under pressure. Air or gases in the liquid can also reduce pressure; consider a gas separation chamber. If the head is lower than the rating, the pump might be pumping too much liquid, so throttle the pump at the discharge...

Summary

INSTALLATION

LOCATION OF PUMP

INSTALLATION ON FOUNDATION

GROUTING

PIPING

Piping requirements for installation, including general guidelines, bypass, filtration, seal drain, and seal flush procedures.

OPERATION

OPERATION LIMITS AND DATA (RG, RO, ROH, 2100, 2200)

Table of operating limits and data for RG, RO, ROH, 2100, 2200 pumps, covering speed, pressure, flow, and temperature.

OPERATION LIMITS AND DATA (R11, RD11)

Operating limits and data specific to R11 and RD11 models, detailing parameters like speed, pressure, flow, and temperature.

BEFORE STARTING

START-UP

OPERATING CHECKS

OPERATING CAUTIONS

SHUTDOWN

TROUBLESHOOTING

NO LIQUID DELIVERED AT END DELIVERY POINT OR THROUGH FLOW METER

Lists possible causes and corrective actions for failure to deliver liquid, including valve status, prime, and obstructions.

NOT ENOUGH LIQUID DELIVERED AT END DELIVERY POINT OR THROUGH FLOW METER

Details potential reasons for insufficient liquid delivery and their solutions, including air leaks, low speed, and cavitation.

NOT ENOUGH PRESSURE ON PRESSURE GAUGE

Addresses causes for low pressure, such as no discharge restriction, low speed, wrong rotation, or internal obstructions.

PUMP OVERLOADS DRIVER

Identifies causes for driver overload, including excessive speed, high specific gravity, high viscosity, or electrical issues.

PUMP WORKS FOR A WHILE THEN QUITS

Explains troubleshooting for pumps that stop intermittently, including priming issues, suction lift, or mechanical failure.

PUMP VIBRATION

Covers causes of pump vibration like cavitation, misalignment, obstructions, and foundation issues, with corrective actions.

BEARINGS OVERHEAT OR WEAR RAPIDLY

Lists reasons for bearing overheating or rapid wear, including lubrication, vibration, dirt, and excessive tightness.

LIQUID RUNS FROM DRAIN HOLE

Weir ROTO-JET RG Specifications

General

Application	Boiler feed, Car wash systems, Chemical processing, Condensate return, Deionized water, High-pressure cleaning, Ink and dye, Machine tool coolant, Mining, Paper mills, Reverse osmosis, Textile mills
Model	RG
Capacity	Up to 250 GPM (57 m³/hr)
Differential Head	Up to 1, 600 ft (488 m)
Maximum Working Pressure	Up to 1, 000 PSIG (69 bar)
Construction	Cast Iron, 316 Stainless Steel, Duplex Stainless Steel
Impeller Type	Regenerative Turbine
Seal Type	Packed or Mechanical
Drive Type	Electric Motor, Engine, Turbine
Power Source	Electric, Diesel, Turbine