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OPERATING INSTRUCTIONS
Priming the Pump
It is essential to prime the pump on initial start-up and
each time the water supply is disconnected from the
unit after initial use.
1. Lay the high pressure hose out to remove any loops.
Water ow will constrict the hose, creating tight loops
if the hose is not straight.
Note: The nozzle assembly should not be connected
to the gun assembly at this time. See “Nozzle Connec-
tion” pg. 9.
2. With the trigger gun locked in the “OFF” position, turn
the water supply completely on. Pointing the gun in a
safe direction, unlock the trigger gun and squeeze the
trigger.
Low pressure water will begin owing from the hose/
gun assembly. This allows the unit to prime and purge
any air from the system. The unit is primed when water
ow is uninterrupted by air.
3. Once the unit is primed, release the trigger and lock
the gun in the “OFF” position. Securely connect the
nozzle assembly. (See “Nozzle Connection” pg. 9)
NOTICE
Be certain the nozzle is not connected to the unit
while priming the pump. Priming allows mineral de-
posits to be released from the system which would
obstruct or damage the nozzle assembly resulting in
costly repairs.
INSTALLATION & PREPARATION
INSTRUCTIONS
Unloader
The unloader will either be adjustable or factory preset
depending on the model you purchased.
Adjustable
The unloader valve on your machine is equipped with
an adjustment knob to adjust the pressure. Should
less pressure be required, simply turn the adjustment
knob counterclockwise. To set back to maximum, turn
adjustment knob completely clockwise. Do not over-
tighten.
Factory Preset (2525 DD Only)
The unloader valve on your machine is factory preset
and should only be adjusted by a trained representative.
Do not adjust the pressure on your own.
NOTICE
Do not overtighten the unloader. Breakage could
result in immediate loss of water pressure and
costly repairs.
Thermal Relief Valve
To ensure the water temperature does not exceed
acceptable levels, never allow the pressure washer to
operate in the bypass mode (with the unit running and
the trigger gun closed) for more than three minutes.
A “thermal relief valve” has been added to this unit to
protect the pump. It may begin to open and release
water if the water temperature in the pump has ex-
ceeded 140°F. This will allow fresh, cool water to enter
the system.
Pre-Start Inspection Procedures
Before starting the unit, perform the following proce-
dures:
1. Check the oil level in the pump and engine.
2. Inspect the water inlet strainer. Clean or replace if
necessary. See “Water Supply” pg. 9.
3. Check all hose connections to ensure they are securely
tightened. See “Water Supply” pg. 9.
Inspect for system fuel leaks. If a fuel leak is found,
do not start unit. See “Fire & Ventilation Precau-
tions” pg. 4. Be sure that all damaged parts are
replaced and that the mechanical problems are cor-
rected prior to operation of the unit. If you require
service, contact Graco Customer Service.
Inspect high pressure hoses for kinking, cuts and
leaks. If a cut or leak is found, do not use hose.
Replace hose before starting unit. See “Miscel-
laneous Safety Precautions” pg. 5. Be sure that all
damaged parts are replaced and that the mechani-
cal problems are corrected prior to operation of the
unit. If you require service, contact Graco Customer
Service.