background image

8- ENG

A00732

PRESSURE WASHER
OPERATING FEATURES

PRESSURE ADJUSTMENTS

The pressure setting is preset at the
factory to achieve optimum pressure
and cleaning. If you need to lower the
pressure, it can be accomplished by
these methods. 

PRESSURE WASHER
TERMINOLOGY (continued)

Bypass Mode: 

Allows water to 

re-circulate within pump when the gun
trigger is not pulled.

Allowing the unit to
run for more than

two minutes without the gun trigger
pulled could cause overheating and
damage to the pump.

Thermal Relief Valve:

When the temperature
inside the pump rises
too high the valve will
open and release a
gush of water in an
effort to lower the
temperature inside the
pump. The valve will then close.

Chemical Injection System:

Mixes

cleaners or cleaning solvents with the
water to improve cleaning
effectiveness.

Water Supply:

All pressure washers

must have a source of water. The
minimum requirements for a water
supply are 20 PSI and 5 gallons per
minute.

3.

Adjust the pres-
sure regulator
on the pump.

Turn the pressure
regulator knob
counterclockwise
to lower pressure.
Refer to the
illustrations to identify your pres-
sure regulator. Once you have fin-
ished using your pressure washer,
return the pressure regulator to its
original position by turning it
clockwise. 

DO NOT try to turn
pressure regulator

knob past the built-in stop or damage
to pump will result.

Pressure
Adjustment
Knob

1.  Back away from the surface to

be cleaned.

The further away you

are, the less the pressure will be
on the surface to be cleaned.

2.

Change to the 40º (white) 
nozzle -  

this nozzle delivers a

less powerful stream of water and
a wider spray pattern.

DO NOT attempt to
increase pump

pressure. A higher pressure setting
than the factory set pressure may
damage pump.

Thermal
Relief
Valve

Summary of Contents for ZR3700

Page 1: ...ructions 2 5 Carton Contents 6 Assembly Instructions 6 Operating Instructions 7 11 Maintenance 11 12 Storage 13 Trouble Shooting Guide 14 15 Warranty 16 Espa ol 17 32 Record All Information and attach...

Page 2: ...ush grass or other similar items then an approved spark arrester must be installed and is legally required in the state of California It is a violation of California statutes section 130050 and or sec...

Page 3: ...mals Some cleaning fluids contain substances which could cause injury to skin eyes or lungs Use only cleaning fluids specifically recom mended for high pressure washers Follow manufacturers recommenda...

Page 4: ...clothing to protect eyes and skin from contact with sprayed materials Use of acids toxic or corrosive chemicals poisons insecticides or any kind of flam mable solvent with this product could re sult...

Page 5: ...ion of your pressure washer could lead to serious injury or death to you or others Do not use chlorine bleach or any other corrosive compound Become familiar with the operation and con trols of the pr...

Page 6: ...es on panel 3 Place handle assembly onto frame depress the snap buttons and slide the handle assembly onto the frame until snap buttons snap into place CARTON CONTENTS Engine Frame and Wheel Assembly...

Page 7: ...mpare the illustrations with your unit to familiarize yourself with the location of various controls and adjustments Save this manual for future reference Engine High Pressure Hose Spray Gun Quick Con...

Page 8: ...rove cleaning effectiveness Water Supply All pressure washers must have a source of water The minimum requirements for a water supply are 20 PSI and 5 gallons per minute 3 Adjust the pres sure regulat...

Page 9: ...NOT use hot water use cold water only NEVER turn water supply off while pressure washer engine is running or damage to pump will result DO NOT stop spraying water for more than two minutes at a time...

Page 10: ...anual for correct procedure 3 Verify the filter screen is in water inlet of pump NOTE Cone side faces out HOW TO APPLY CHEMICALS AND CLEANING SOLVENTS Applying chemicals or cleaning solvents is a low...

Page 11: ...of clean water and draw clean water through chemical injection system to rinse system thoroughly NOTE Failure to do so could cause damage to the pump 2 Turn engine off See Engine Owner s Manual NOTE N...

Page 12: ...il 1 Remove dipstick oil plug from pump and wipe clean 2 Insert dipstick oil plug fully into pump then remove it 3 Oil level is correct when oil covers the lower 1 2 inch of end of dipstick oil plug H...

Page 13: ...p protector winterizer or RV antifreeze is to provide proper lubrication to the internal seals of the pump regardless of temperature or environment 1 Obtain a funnel six ounces of RV antifreeze and 16...

Page 14: ...GPM 20 PSI Leak at high pressure hose fitting Repair leak Apply sealant tape if necessary Nozzle obstructed See Nozzle Cleaning instructions in the Maintenance section Water filter screen clogged Remo...

Page 15: ...e Check and replace Loose hose connection Loose connections Tighten Piston packings worn Have replaced by AWSC Worn or broken o rings Have replaced by AWSC Pump head or tubes damaged from freezing Hav...

Page 16: ...purchaser does not receive satisfactory results from the Authorized Warranty Service Center the purchaser should contact DeVilbiss Air Power Company THIS WARRANTY DOES NOT COVER Merchandise sold as r...

Reviews: