Lubricated Belt Driven Piston Compressor Pumps

How to Select a Replacement Compressor Pump

Replacing a belt-driven piston compressor pump involves more than matching the motor horsepower. The pump must work correctly with the existing drive, receiver, controls and pipework.

How a Lubricated Belt-Driven Piston Compressor Pump Works

A belt-driven piston pump uses an external electric motor or engine to rotate the compressor crankshaft through a pulley and belt arrangement. The pistons draw atmospheric air into the cylinders and compress it before delivering it towards the receiver.

Lubricated pumps use compressor oil within the crankcase to lubricate moving components such as bearings, crankshaft surfaces and cylinder mechanisms. The correct lubricant level and specification are therefore important to reliable operation.

Standard & PRO Low-Noise Pump Options

Standard B-Series Pumps

Standard B2800B and B3800B models are conventional lubricated belt-driven piston compressor pumps for compatible replacement and rebuild applications.

PRO Low-Noise Pumps

The B2800B PRO and B3800B PRO models provide an alternative pump configuration for compatible low-noise compressor builds. They should still be matched against the original machine and drive arrangement before ordering.

Replacement Pump Installation

Correct mechanical setup is important when fitting a replacement compressor pump. Poor belt alignment, an incorrect pulley ratio or incorrect rotation can cause premature wear or poor compressor performance.

• Confirm the replacement pump matches the intended compressor application
• Set the correct pulley ratio
• Align motor and pump pulleys correctly
• Set suitable belt tension
• Confirm pump rotation before normal operation
• Check the correct compressor lubricant level
• Inspect delivery pipework and fittings
• Confirm pressure controls and safety devices are functioning correctly
• Refit all belt and drive guards before use

Pump Speed, Cooling & Pulley Selection

Belt-driven compressor pumps are designed to operate within a suitable rotational-speed range. Changing the motor pulley or pump pulley changes compressor speed, so pulley selection should not be altered without confirming the pump requirements.

Excessive speed can increase operating temperature and mechanical load, while an unsuitable drive ratio can affect delivered airflow and reliability. Cooling airflow around the pump should also remain unobstructed.

Need Help Identifying Your Existing Compressor Pump?

If the pump reference is unclear, send us the compressor and pump details before ordering. Photographs are particularly useful where older pumps or machine revisions are involved.

• Existing pump model or casting reference
• Compressor manufacturer and model
• Compressor serial number
• Motor power and speed
• Motor and pump pulley sizes where known
• Crankshaft dimensions where relevant
• Photographs of the pump, mounting and drive arrangement
• Photographs of delivery and unloader connections