The compressor pump is the heart of a belt-driven compressor. These lubricated cast iron pumps serve as replacements for workshop belt-driven compressors or for building your own unit, from 2 HP to 7.5 HP, single- or two-stage and up to 10 bar.
The MK102, MK103 and BK113 have a cast iron cylinder block, cylinder head with large fins, balanced spheroidal graphite iron crankshaft, stainless steel valves, high-flow pulley with deflector and labyrinth intake filter. The BK114 and BK119 are two-stage with intercooler and inter-stage safety valve, cast iron cylinder and aluminium crankcase and head, and are supplied with a 1B pulley. The K28 is a 4 HP high-performance pump.
✅ Key benefits
Cast iron: robust cylinders for many hours of work.
Low speed: smooth running, less wear and longer maintenance intervals.
Single or two-stage: choose between single-stage MK102/MK103 or two-stage BK113, BK114 and BK119.
Inter-stage cooling: BK114 and BK119 with intercooler and intermediate safety valve.
Complete range: from 2 to 7.5 HP and from 235 to 840 L/min.
🏗️ What it's for
Replacing the worn pump of a belt-driven compressor.
Building or rebuilding workshop compressors.
Service centres and repair workshops.
Air units for machinery and industrial use.
📋 Technical specifications
MK102: 2 HP · 2 cylinders, 1 stage · 235 L/min free air delivery · 10 bar · 8 kg · 27 x 26 x 28 cm
MK103: 3 HP · 2 cylinders, 1 stage · 365 L/min free air delivery · 10 bar · 8 kg (9 kg packed)
K28: 4 HP · 539 L/min intake · 10 bar · 1,400 rpm · 26.5 kg packed
BK113: 5.5 HP · 2 cylinders, 2 stages · 550 L/min free air delivery · 10 bar · 17 kg packed (pump of the PRO300-5.5TF)
BK114 with 1B pulley: 5.5 HP · 2 cylinders, 2 stages · 10 bar (14 bar version on the 90 L compressor) · 25.5 kg packed
BK119 with 1B pulley: 7.5 HP (5.5 kW) · 2 stages · 840 L/min · 10 bar · 1,250 rpm · 27 kg packed
Lubrication: oil
Drive: belts
💡 Pro tip: when you replace the pump, also replace the belt and check the pulley alignment; an old or misaligned belt will wear out the new pump in a few hours. Fill it with compressor oil of the specified viscosity and do the first oil change after the initial running-in hours.
Frequently asked questions
Which pump do I need?
The same model fitted to your compressor (MK102, MK103, K28, BK113, BK114 or BK119), or one with power equivalent to the motor and the same pulley.
Are they supplied with oil?
They are lubricated pumps; check the level and fill with compressor oil before starting up.
What is the difference between single and two-stage?
In two-stage pumps the air is compressed in two phases with intercooling; it runs cooler and performs better at high pressures and in heavy-duty use.
Do they include a pulley?
The BK114 and BK119 are supplied with a 1B pulley; the MK102, MK103 and BK113 have a high-flow pulley with deflector.
What is the difference between intake air and free air delivery?
Intake air is what enters the pump; free air delivery is what it actually delivers to the tank, which is always somewhat less. To compare pumps, always use the same figure.
Frequently Asked Questions
Which pump do I need?
The same model fitted to your compressor (MK102, MK103, K28, BK113, BK114 or BK119), or one with power equivalent to the motor and the same pulley.
Are they supplied with oil?
They are lubricated pumps; check the level and fill with compressor oil before starting up.
What is the difference between single and two-stage?
In two-stage pumps the air is compressed in two phases with intercooling; it runs cooler and performs better at high pressures and in heavy-duty use.
Do they include a pulley?
The BK114 and BK119 are supplied with a 1B pulley; the MK102, MK103 and BK113 have a high-flow pulley with deflector.
What is the difference between intake air and free air delivery?
Intake air is what enters the pump; free air delivery is what it actually delivers to the tank, which is always somewhat less. To compare pumps, always use the same figure.
Todo excelente. Tras una primera equivocación con el producto elegido, el equipo de atención al cliente se puedo a trabajar para solucionar el problema y darme una solución adecuada.
