LMI Roytronic Series A Pump Spare Parts Replacement

Depressurizing the Discharge Line  (for Pumps Equipped with a 4-FV Only)

ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

To reduce the risk of chemical splash during disassembly or maintenance, all installations should be equipped with line depressurization capability. Using LMI’s Four-Function Valve (4-FV) is one way to include this feature.

Read steps 1 and 2 below before proceeding.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your 4-FV and runs back to your solution drum or tank.

2 . Turn the black knob on the 4-FV 1/8 turn to the stop. Turn and hold the yellow knob for a few seconds. The discharge line is now depressurized. Keep both valve knobs open until solution drains back down the discharge tubing into the solution tank or drum. Then release the yellow knob, and turn the black knob to its normal position.


Depressurizing the Discharge Line  (for Single-Ball FastPrime™ Heads Only)

ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

Read steps 1 and 2 below before proceeding.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your FastPrime™ valve and runs back to your solution drum or tank.

2 . Turn the FastPrime™ knob one-and-a-half turns counter-clockwise Q. The discharge line is now depressurized. Keep valve open until solution drains back down the discharge tubing into solution drum or tank. Then turn the knob clockwise P to tighten knob to closed position.


Liquifram™ (Diaphragm) Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working near or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions. 

LMI metering pumps are designed for trouble-free operation, yet routine maintenance of elastomeric parts is essential for optimum performance. This involves replacing the Liquifram™, cartridge valves, O-rings, 4-FV cap assemblies and the injection check valve spring. LMI recommends replacing these parts at least once a year; however, frequency will depend on your particular application.

When replacing the Liquifram™, the cartridge valves, or O-rings, the injection check valve spring should also be replaced (see next Section 5.4). A Spare Parts Kit or RPM Pro Pac™ kit containing these parts may be obtained from your local distributor.

Replacing the Liquifram™:

Chemical Pumps US
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1 . Carefully depressurize, drain, and disconnect the discharge line (see previous sections in this manual).

2 . Place the Foot Valve into a container of water or other neutralizing solution. Turn the pump on to flush the head assembly. Once the pump head has been flushed, lift the Foot Valve out of the solution and continue to pump air into the pump head until the pump head is purged of water or neutralizing solution.

If the liquid cannot be pumped due to Liquifram™ rupture, carefully disconnect the suction and discharge tubing using protective clothing, gloves and face shield. Remove the four screws and washers from the head and immerse the head in water or other neutralizing solution.

3 .   Start the pump. While running, set the Stroke Adjustment Knob to 0% and turn the pump off.

4 . With the unit off, unscrew the Liquifram™ by carefully grasping the outer edge and turning it counter-clockwise. Discard old Liquifram™. Remove the Adapter Disk (located behind the Liquifram™) and ensure that the diameter of the raised section is the same as the diameter of the replacement Liquifram™.

5 . Remove Adapter Disk and check condition of the Shaft Seal. Replace Shaft Seal if necessary.

6 . Replace the Adapter Disk so that the drain hole of the disk is oriented downward, and the mounting holes line up with the mounting holes of the pump.

Precautions Pump OperationBe careful not to scratch the Teflon® face of the new Liquifram™.

7 . Screw on the new Liquifram™ clockwise until turned all the way in. Start the pump and turn the stroke knob to 100%. Stop the pump.

8 . Remount the pump head using the four (4) screws and washers. Tighten in a criss-cross pattern. After one week of operation, recheck the screws and tighten if necessary.


Cartridge Valve and O-ring Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions.

1 . Carefully depressurize and disconnect the discharge line (see Section 5.1 or 5.2 in this manual).

2 . Place the Foot Valve into a container of water or other neutralizing solution. Turn the pump on to flush the head assembly. Once the pump has been flushed, lift the Foot Valve out and continue to pump to let air into the pump head until pump is purged of water or neutralizing solution.

If the liquid cannot be pumped due to Liquifram™ rupture, carefully disconnect the suction and discharge tubing using protective clothing, gloves and face shield. Remove the four screws and washers from the head and immerse the head in water or other neutralizing solution.

Spare part replacement kits include specific instructions for valve replacement. Please follow the instructions included with the replacement kit.

3 . Carefully disconnect one tubing connection and fitting at a time, then remove and replace the worn valve and O-rings. If necessary, carefully loosen stuck valves by prying side to side using a small screwdriver through the center hole of the valve.

Before disassembling the check valves, note the orientation of the valve.

4 . Install new check valves in each location. Ensure that the cartridges are oriented correctly.


Injection Check Valve Parts Replacement

Depressurize and drain pipeline (or isolate Injection Check Valve point using valves) so that Injection Check Valve can safely be disassembled.

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working near or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions. 

Refer to the LMI Metering Pump Price List for the proper Spare Parts Kit or RPM Pro Pac™ kit number or contact your local LMI stocking distributor.

1 . Isolate Injection Check Valve and depressurize pipe or drain pipeline.

2 . Carefully depressurize and disconnect the discharge line (see Section 5.1 or 5.2 in this manual).

Spare part replacement kits include specific instructions for valve replacement. Please follow the instructions included with the replacement kit.

3 . Carefully disconnect the tubing leading to the Injection Check Valve, then remove the Injection Check Valve Fitting. Remove and replace the worn spring, seat, ball, and O-ring.

Before disassembling the check valve, note the orientation of the parts.

4. Install a new spring, seat, ball, and O-ring. Ensure that the parts are oriented correctly.

LMI Pumps Purchase
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FastPrime™ Valve O-Ring Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

Refer to the LMI Metering Pump Price List for the proper Spare Parts Kit or RPM Pro Pac™ kit number or contact your local LMI stocking distributor.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your FastPrime™ valve and runs back to your solution drum or tank.

2 . Turn the FastPrime™ Knob one-and-a-half turns counter-clockwise Q. This will depressurize the head. Keep valve open. Carefully remove the return line by gently pulling tubing and moving it from side to side to gradually back tubing off of the barbed fitting.

3 . Hold return line tubing upright until solution drains back into solution drum or tank.

4 . Using a 3/4″ (or 19mm) socket or wrench remove Retaining Nut, and pull out the entire FastPrime™ Valve assembly. Remove and replace the two small O-rings.

5 . Reinsert the FastPrime™ Valve assembly and retighten the Retaining Nut. Then turn the FastPrime™ Knob clockwise to tighten knob to closed position. To avoid damaging the parts, it is important that the flange on the FastPrime™ Valve is flush with the Retaining Nut prior to reassembly.

LMI Pump Maintenance
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6 . Recut 1 to 2 inches off the tip of the return line and ensure the end is squared. Press the return line tubing on completely past the barbs.

Series A Maintenance
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Stroke Length Setting

The Stroke Adjustment Knob is calibrated for each pump, and does not need to be removed during Liquifram™ replacement or during most other maintenance. If the Stroke Knob is removed for any reason it becomes necessary to reset the stroke length. Follow the procedure below to approximate the proper factory setting. If a more accurate setting is required contact your distributor or manufacturer.

1 . Install a new Stroke Shaft. Note that there will be some resistance as the O-ring slides into the control panel. The Stroke Knob can be used to turn the Stroke Shaft. Continue to turn the Stroke Shaft until there is no longer any diaphragm movement. It may be necessary to turn on the pump in order to get the Stroke Knob completely forward; however, care should be taken to ensure that the Stroke Shaft is contacting the Plunger before turning on the unit. Otherwise the pump could be damaged.

2 . Once the Stroke Shaft is completely forward, you can reset the stroke length. Press in the Stroke Knob so that the Stroke Knob Pointer indicates 0 (zero).

3 . Use a Phillips head screwdriver to install the Stroke Knob Screw.

4 . Insert the Stroke Knob Pointer into the Stroke Knob.

LMI Pump Stroke Shaft
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