Comet RWS4540S Belt Drive Triplex Pump - 18.2 L/min, 4,000 psi

The 1,750 rpm sibling of the RW. If your machine runs a two pole motor, or you want more flow from the same size pump, this is the one to fit. Identical construction to the RW - cast crankcase, ceramic plungers, oil bath - just geared to run faster.

The Comet RWS4540S delivers 18.2 L/min at 4,000 psi running at 1,750 rpm, with a 24mm solid shaft.

Specifications

What is in the box

• One RWS belt drive pump, the model you choose above
• Factory oil fill – check the level before first start
• Pump only. Unloader, gauge, pulley, hose and gun are separate unless you ask us to build a package

Specifications and drawings

Manufacturer documents for this model, free to download.

Owner / operator manual (PDF)Spare parts list (PDF)Manufacturer data sheet (PDF)

Technicians Advice

• Starve a plunger pump and you will kill it. These want a flooded inlet or a gravity feed. A long, thin or half collapsed suction hose cavitates the pump, and you hear it as a rattle long before you see it as pitted plungers and a shredded seal kit.
• The unloader does more damage than the pump ever will. Long spells in bypass heat the water, and hot water in a bypass loop cooks the seals. If the operator sits on the trigger lock with the gun shut, run the bypass back to tank rather than round a loop.
• Change the oil early and often. First change at about 50 hours to clear the run-in debris, then every 500. Milky oil means water has got past the seals - that is the pump telling you the seal kit is due, not that it has failed.
• Belt tension is a setting, not a guess. Too loose and you glaze the belt and lose flow under load; too tight and you side load the crankshaft bearing. Aim for about 10 to 15 mm deflection at the middle of the span under firm thumb pressure.
• Water quality decides seal life more than hours do. Bore and recycled wash bay water carries grit that laps the ceramic plungers. A 50 mesh inlet filter is the cheapest insurance you will ever fit.
• Never run it dry, not even briefly. The water is the lubricant and the coolant for the plunger seals. Priming a dry pump with the gun shut is how a new pump becomes a warranty argument.

Complete your setup

Browse all Belt Drive Triplex PumpsPressure Washer HoseHose Reels

Fitting out a fleet or building machines? Call us and we will price the job.

Need help matching a pump to your machine? Call 1300 146 737 or email sales@mhfgc.com.au – real technicians, real answers.