Old Part Numbers: 046-0137Oil seal for the crankshaft (flywheel side) of the B5900 air compressor pump.

Oil breather assembly for the B5900 air compressor pump.

10mm steel aftercooler bolt for B5900/HP51 air compressor pumps.

Gasket for bottom oil pan of air compressor pump. If the compressor pump doesn't seem to pressurize as quickly as it should or is leaking in between the head, valve plate, cylinder, or crankcase while running, there's a good chance you need to install...

Old Part Numbers: 6211848500, 223611336110 X 35MM

Old Part Numbers: 2236102113B5900 air compressor pump flywheel, 13.78" OD (outside diameter), 30mm bore. Replace if warped or if missing any cooling fins. Fins should be angled correctly to properly cool the pump.

Old Part Numbers: 5962020Intercooler tube between the high and low cylinders (order the intercooler gasket as well).