Hi and welcome to FixYa, I am Kelly PUMP The manufacturer recommends using a pump protector/winterizer, such as EX80, when storing the unit for more than 30 days and/or when freezing temperatures are expected. If a pump protector/winterizer is not available, *RV antifreeze needs to be run through the pump as outlined in the steps
First here is the owders manual:
http://www.excellpressurewasher.com/documents/pdf/D30494-E.pdf
There are 3 versions of the VR2500 Pressure Washer.
1 being the VR2500 Type 0 It has the comet pump that needs no oil
2 being the VR2500 Type 1 Also with the comet pump.
3 being the VR2500-C Again with the coment pump
The allen set screws that you removed hold the bearings in place.
The only pump maintence required is winterization with either a winterizer EX80 or RV anti-freeze
below.
EXCell does make units that have an AR pump that requires pump oil. The VR2500 pump does not.
Thanks for choosing FixYa.
Kelly
Take a look at this link if you still have doubts about pump oil:
http://support.dewalt.com/app/answers/de...
The link lists all pressure washer pumps.. Except Comet. The majority of Comet pumps are dry sump pumps. Only the largers 3200 PSI and above Comet pumps have wet sumps.
Additionally see this note::
These pumps do not require the oil to be changed, the oil will last the lifetime of the pump. In the unlikely event of an oil leak, remove all oil and add the correct amount.
(let me add catastrophic pump failure and overhaul would be a reason to change the oil)
Thanks again for choosing FixYa.
Kelly
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