Comet LW2020S Belt Drive Triplex Pump - 8 L/min, 2,000 psi

The small end of the Comet belt drive range and the one that turns up on more trailer mounted washers and wash bay units than anything else. Cast crankcase, ceramic plungers, oil bath, and a seal kit you can get over the counter for the next twenty years. If you are repowering a machine in the 3 to 5 hp bracket this is usually the pump that came out of it.

The Comet LW2020S delivers 8 L/min at 2,000 psi running at 1,450 rpm, with a 24mm solid shaft.

Specifications

What is in the box

• One LW series triplex plunger 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 items 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 will cavitate the pump and you will hear it as a rattle before you see it as pitted plungers and a shredded seal kit.
• The unloader does more damage than the pump ever will. Running in bypass for long stretches heats the water, and hot water in a bypass loop cooks the seals. If the operator sits on the trigger lock with the gun shut, fit a bypass line back to tank rather than 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 and the pump is telling you the seal kit is due, not that it has failed.
• Belt tension is a real 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. A correctly tensioned belt deflects about 10 to 15 mm at the middle of the span under firm thumb pressure.
• Water quality decides seal life more than hours do. Bore water and recycled wash bay water carry grit that laps the ceramic plungers. A 50 mesh inlet filter on the suction side is the cheapest insurance you will ever fit to one of these.
• Never run it dry, not even for a few seconds. 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 turns into 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.