✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Description
Genuine LMI Roytronic RPM Maintenance Kits For Liquid End Rebuilds
LMI Roytronic RPM kits supply every expendable part in the liquid end assembly: Liquifram diaphragm, shaft seal, valve assemblies, check balls, springs, valve seats, O-rings, and pump head screws. Each kit ships vacuum-packed onto a cardboard schematic showing exact part placement, so technicians can complete a full rebuild without guesswork.
What's in the Kit
Each LMI Pro-Pac Roytronic RPM kit includes:
- Liquifram diaphragm
- Shaft seal
- Suction and discharge valve assemblies
- Ceramic check balls
- Valve springs
- Valve seats
- O-rings
- Pump head screws
- Tubing connection ferrules
- Injection check valve components
- Part replacement schematic (cardboard overlay)
- Instruction sheet
Contents may vary slightly depending on the specific RPM kit model and liquid end configuration (Standard, Fast-Prime, or AutoPrime). Pumps that use Roytronic four-function valve assemblies may also need a separate valve replacement if the assembly shows wear beyond what the RPM kit covers.
RPM Kit Cross-Reference
Use this table to match the correct RPM kit to your pump's Roytronic liquid end assembly number:
| Kit Number | Fits Roytronic Liquid End Assemblies |
|---|---|
| RPM-910A | 910AX, 910HX, 918AX, 918HX |
| RPM-920A | 920AX, 920HX, 928AX, 928HX |
| RPM-A10A | A10AX, A10HX, A18AX, A18HX |
| RPM-A20A | A20AX, A20HX, A28AX, A28HX |
| RPM-A30A | A30AX, A30HX, A38AX, A38HX |
| RPM-A40A | A40AX, A40HX, A48AX, A48HX |
The suffix tells you the liquid end configuration: "AX" indicates a standard liquid end, "HX" indicates a Fast-Prime or AutoPrime liquid end. If your liquid end assembly number is not listed above, contact Cleanflow with your full pump model number for cross-reference.
Pump Compatibility
Roytronic RPM kits fit the following LMI pump series:
| Pump Series | Description |
|---|---|
| A1 (Roytronic Series A) | Solenoid-driven, microprocessor-controlled metering pump with NSF, UL/cUL, or CE certification |
| AD9 (Roytronic EXCEL Series AD) | Advanced solenoid metering pump with microprocessor control and improved electromagnetics |
| PD0 (Series PD, Standard/Fast-Prime) | Positive displacement metering pump with standard or Fast-Prime liquid end |
| PD7 (Series PD, AutoPrime) | Positive displacement metering pump with AutoPrime degassing liquid end for off-gassing chemicals |
Each pump series uses Roytronic-type liquid ends with double ball check valves. Match the RPM kit part number to your pump's model code to get the correct diaphragm material, valve seat material, and seal configuration.
When to Replace
LMI recommends replacing all elastomeric components on an annual basis for maximum dosing accuracy and pump reliability. Signs that a rebuild is overdue:
- Declining chemical output at the same stroke and speed settings
- Visible diaphragm wear, cracking, or chemical discoloration
- Loss of prime that repriming does not resolve
- Leaking at the pump head or valve connections
- Check valve seats showing erosion or pitting
Sodium hypochlorite and other oxidizing chemicals accelerate wear. Pumps dosing bleach or peroxide may need liquid end service more frequently than once per year.
How to Use the Kit
- Isolate the pump from the chemical supply and relieve system pressure.
- Remove the pump head screws and separate the liquid end from the drive housing.
- Lay the old components against the included schematic to confirm part-for-part replacement.
- Install the new Liquifram diaphragm, shaft seal, valve assemblies, check balls, and O-rings per the instruction sheet.
- Reassemble the pump head using the new screws provided. Hand-tighten all fittings, then add 1/8 to 1/4 turn past the seal ring contact point. Do not use PTFE tape or pipe dope on O-ring-sealed threads.
- Reprime the pump and verify output using a calibration column.
Buy LMI Roytronic RPM Maintenance Kits Online from Cleanflow
Order genuine LMI Pro-Pac Roytronic RPM kits from Cleanflow with fast shipping across Canada and the United States. Browse all LMI pump repair parts or explore the full LMI metering pump and control equipment range. Contact Cleanflow for help matching the correct kit to your pump model.
Frequently Asked Questions
How do I know which RPM kit fits my pump?
Match the three-digit number in the RPM kit part number to your pump's liquid end model code. The LMI schematic included with each kit confirms the fit. If you are unsure, contact Cleanflow with your pump's full model number for cross-reference.
What is the difference between Standard, Fast-Prime, and AutoPrime kits?
Standard kits cover the base Roytronic liquid end. Fast-Prime kits include a fast-priming valve assembly. AutoPrime kits include the degassing valve components that vent trapped gas back to the solution tank on each stroke. The pump's model code indicates which liquid end type it uses.
How often should I replace the liquid end parts?
LMI recommends annual replacement of all elastomeric components. Pumps handling aggressive chemicals like sodium hypochlorite or hydrogen peroxide may need service every 6 to 9 months, depending on concentration and operating hours.
Can I reuse any parts from the old liquid end?
Replace all parts included in the kit during each service. Reusing worn check balls, valve seats, or O-rings risks leaks and reduced dosing accuracy. The kit costs less than a single unplanned pump failure.
Do I need special tools for the rebuild?
No. The rebuild uses standard hand tools. The included schematic and instruction sheet walk through each step. A calibration column (sold separately) is recommended for verifying output after reassembly.
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
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