Question about Dewalt 3700 Pressure Washer

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Dewalt 3700 pressure washer will not take in the cleaning solvents works fine but will not spray chemicals

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Be sure that you have your chemical injector plumbed correctly. They will only work one way.

Posted on Oct 08, 2009

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Be sure you're using soap tip.

Posted on May 27, 2010

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Posted on Jan 02, 2017

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1 Answer

I was able to use soap all last season, this year, i cannot get it to come thru, i know all about the low pressure deal, it seems to be clogged/ is there any way to specifically clean it where it enters...


Soap injectors are easily clogged or will not work because of design (air leaks will prevent chem from entering if chemical has to be drawn uphill) . They work with siphon action and will only work with very little pressure at the tip but good volume. If your siphon valve has the ball in place, however is missing the fine spring that holds the ball against seat (fine spring holds ball aginst intake fitting), the soap will not be sucked into stream. If ball and spring are in place, try elevating the soap container higher than the opening of the port (gravity feed may help to feed soap into system) . May be better to use an aftermarket downstream injector valve sold on ebay or many outlets. Cost about $20 but work better and are adjustable to save on soap. Search ebay for "Chemical Injector For Pressure Washers" or google "Pressure Washer Downstream Chemical Injectors" Various prices but lower price units work better than factory. Good luck

Jul 18, 2011 | Honda Black Max 2600 PSI Pressure Washer

1 Answer

Dewalt Pressure washer keeps shutting off for no reason. plenty of gas and oil, water running to it. starts fine and as soon as I start spraying it shuts down.


Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!

Aug 08, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

Were can I buy water pumt for dewalt presure washer


http://www.ereplacementparts.com/dewalt-parts-c-1009.html

Aug 03, 2010 | Dewalt 3700 Pressure Washer

1 Answer

In originally how is the warranty .


DEWALT Pressure washers warranty is as follows:


DEWALT pressure washers model year 2007 and prior (yellow frames) have a 2 year engine warranty, 1 year all other limited warranty.


DEWALT pressure washers model year 2008 (black frames) have a 2 year all components covered warranty.


Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Mar 19, 2010 | Dewalt 3700 Pressure Washer

1 Answer

De Walt pressure cleaner not drawing chemicals


pull the hose off at the end going into the water pump there is a screen inside of that fitting remove it and clean reinstall and try it again, sometimes the pressure washer has to be on low pressure in order to pull soap out of the bottle.

Nov 22, 2009 | Washing Machines

1 Answer

Water coming out solvent intact hose


There is a small ball and spring in the intake valve. One of them is missing or the ball isn't seating properly

Aug 29, 2009 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

No pressure on certain settings


Dear Osville,
It is not clear what type of lance or nozzel you have. You said that the machine works fine with the circulating water jet(the turbo). So it seems the machine is fine. I do sometimes service variable nozzels and variable lances. But the best solution is to replace nozzels and variable nozzles and lances with new ones. Regarding the fan spray setting it could have no pressure because it might be in the chemical setting. The chemical setting lets out a fan shape flow of water, but with less pressure. The chemical system only works on low pressure in domestic washers, that is why it needs a low pressure flat spray. The pencil jet has 2 jets comming out because if it is a lance or nozzel with ball bearings, these ball bearings must have stuck in a wrong position. Also 2 jets can come out, due to a damaged nozzel hole.
Altogether, the best advice is to buy a new nozzel or lance...which ever your machine uses. All Karcher machines have their own specific nozzels, lances and high pressure hoses. You cannot change these from one model to another.
Regards,
Fulltech.

Apr 29, 2009 | Alfred Karcher K 5.93 M Electric Pressure...

2 Answers

I have a dewalt 3750 pressure washer, when I pull the trigger on the spray wand the engine dies


I worked at a tool rental center while attending college and learned many tips and tricks about Dewalt and other brand pressure sprayers. Your machine probably has a 13 hp honda and has max pressure of about 3500 to 3700 psi. Most of the problems that customers had were engine related due to severe working conditions including totally wet engine /plug, wet air filter, and or other problems that were easy to remedy. We would set the pressure regulator to minimum pressure and explained to the customer how to increase the pressure as necessary but only after the engine was completely warmed-up to running temp to prevent engine stall. Your machine has a throttle lever between the tank and carb that should be set to max if you are going to set pressure at or neer max range. Most cleaning jobs do not need much pressure. Use lowest pressure to get the job done. Your engine developes around 13hp at about 3600rpm. If you want to maximize the life of you sprayer, then use your machine at about 70% of capacity or about 2000 to 2500 range that will allow you to run your engine slower increasing lifespan. Your sprayer is likely rated at 4 gallons per minute so make sure that the tip is that capacity. The tip has the size stamped which would show the fan degree and flow in gpm. The wrong tip, say a 3.5 gpm will strain the engine to point of stop because the smaller tip increases pressure. Most engine stall is due to high pressure setting on new machines. Lower pressure when warming-up machine and use max pressure rarely when necessary to max life. Please email for other information/questions or simple tests to determine faulty parts, good luck.

Jan 30, 2009 | Dewalt 3800 PSI Pressure Washer

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