10
GPU 18-8 Hydraulic Power Unit
Maintenance
Hydraulic system must be depressurized when
performing maintenance or repair on the power unit
hydraulic system. Depressurizing the hydraulic system
will also make tool hose connections/disconnections
easier.
1.
Stop power unit engine.
2.
Move flow ON/OFF lever to the ON position.
System will be depressurized.
3.
Before restarting power unit engine, move flow ON/
OFF lever to the OFF position.
Depressurizing Hydraulic System
Skin Injection Hazard:
High pressure oil easily punctures skin
causing serious injury, gangrene or
death. If injured seek medical help
immediately to remove oil.
Do not use fingers or hands to check
for leaks.
Depressurize hydraulic system before
servicing.
Stop engine before filling fuel tank.
Do not fill fuel tank when engine is hot.
Do not fill fuel tank near an open flame,
sparks, or when smoking. Fuel is
flammable and explosive and, if ignited,
will result in severe injury or death.
Do not run the power unit engine in a confined
area. Engine exhaust fumes are toxic. If inhaled,
exhaust fumes can cause injury or death.
Inspect the hydraulic hoses and couplings every
operating day. Repair or replace if leakage, crack-
ing, wear, or damage is evident. Damaged hoses
or couplings can fail, resulting in injury or property
damage.
Do not disconnect tool, hoses, or fittings while
the power unit is running or if the hydraulic fluid is
hot. Exposure to hot hydraulic fluid can cause
serious burns.