INSTALLATION & PREPARATION INSTRUCTIONS
Unloader
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.
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.
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