What the MKU1-KW2-20004+428 Is
This is an aftermarket replacement electric gear pump unit built for single-line oil lubrication systems. The designation cross-references to the SKF MKU1-KW2-20004+428 series, delivering a fixed output for small to medium lubrication circuits. It includes a two-liter translucent plastic reservoir, a visual pressure gauge, and a fill-level switch for low oil monitoring. The pump has no integrated control unit, so the motor is started and stopped by an external machine PLC or lubrication controller.
SKF and Vogel are trademarks of their respective owners.
This is an aftermarket pump unit, not manufactured, sponsored, or endorsed by SKF.
MKU1-KW2 designations are for cross-reference identification only.
Specifications
| Designation | MKU1-KW2-20004+428 |
| Type | Electric gear pump unit for single-line oil |
| Output | 0.1 L/min |
| Relief valve setting | 30 bar |
| Medium | Mineral or synthetic oil |
| Viscosity range | 20-750 mm2/s |
| Reservoir | 2 L translucent plastic |
| Outlet connection | G1/4 |
| Protection class | IP54 |
| Voltage | 230 V AC per +428 suffix |
| Integrated control | None, external PLC required |
| Fill-level switch | Included |
| Pressure gauge | Included, visual only |
Reading the Designation
The code blocks within the designation describe the exact configuration. The MKU1 family identifier means an oil pump for single-line lubrication systems with a 0.1 L/min output. The KW2 block breaks down as follows: K indicates a fill-level switch is included, W indicates a pressure gauge is included, and 2 means the unit has a two-liter plastic reservoir.
The configuration code 20004 means no integrated control unit, a fill-level switch, no pressure switch, a pressure gauge, and a plastic reservoir. The +428 suffix identifies the 230 V AC electrical configuration. The family also includes 115 V AC and 24 V DC versions, so always confirm the exact electrical version against the pump nameplate before ordering.
The 750 mm2/s Limit for MKU1
The MKU1 pump is rated for oil viscosity from 20 to 750 mm2/s. The larger MKU2 and MKU5 models within the same family extend the usable range up to 1500 mm2/s. If your lubrication oil is thicker than 750 mm2/s, specify an MKU2 or MKU5 pump unit instead to ensure proper pickup and delivery.
Control, Fill-Level Switch, and Gauge
This unit has no integrated control unit. The machine PLC or an external lubrication controller must start and stop the motor. The fill-level switch opens when the oil level drops below minimum. Wire that switch to a PLC digital input as a low-level alarm and confirm the contact type against the PLC input configuration.
The pressure gauge is a visual analogue indicator only. It produces no electrical signal. Electrical pressure monitoring requires adding a separate pressure switch to the lubrication circuit.
Related Parts
For a higher output option, see the MKU2-KW3 gear pump unit, the 0.2 L/min sibling within the same single-line oil lubrication family.
Browse more single-line and multi-line options on the lubrication oil pumps page to compare reservoir sizes and control options.
For help selecting the right pump within a complete system, review centralized lubrication systems, then request pricing through the quotation form.
Frequently Asked Questions
What is this pump unit?
This is an aftermarket replacement gear pump unit for single-line oil systems. It cross-references to the SKF MKU1-KW2-20004+428 designation.
What is the output of MKU1 compared to MKU2?
The MKU1 delivers 0.1 liters per minute while the MKU2 delivers 0.2 liters per minute. Select the output based on the number of lubrication points and system volume.
What does KW2 mean in the designation?
The K means a fill-level switch is included for low-level monitoring. The W means a visual pressure gauge is fitted, and 2 means a two-liter reservoir.
What does the 20004 configuration code mean?
The code means no integrated control unit and no pressure switch are included. It includes a fill-level switch, a pressure gauge, and a plastic reservoir.
What does the +428 suffix mean?
The +428 suffix identifies the 230 V AC electrical configuration for this pump unit. The family also has 115 V AC and 24 V DC versions, so confirm your nameplate.
What is the viscosity limit for MKU1?
The MKU1 handles oil viscosity from 20 to 750 mm2/s. For thicker oil up to 1500 mm2/s, choose an MKU2 or MKU5 pump unit instead.
Is a lubrication controller included with this pump?
No integrated control unit is included with this pump unit. The machine PLC or an external lubrication controller must start and stop the motor.
What does the pressure gauge do?
The pressure gauge gives a visual analogue reading of system pressure only. It produces no electrical signal for monitoring or switching.
Can this MKU pump be used for oil-air lubrication?
No, MKU pumps are for oil in single-line systems only. Oil-air lubrication requires an MKL series pump unit instead of an MKU unit.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
Use the quotation form to request pricing and support. A support engineer will confirm output, reservoir, and voltage before ordering.
