Hitachi 288466 - Manual (Page 3)

Service
311845C 3
Service
Pressure Relief Procedure
1. Engage trigger lock.
2. Turn engine ON/OFF switch to OFF.
3. Move pump switch to OFF and turn pressure control
knob fully clockwise.
4. Unlock trigger lock. Hold metal part of gun firmly to
side of grounded metal pail and trigger gun to
relieve pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray
again.
If you suspect the spray tip or hose is clogged or that
pressure has not been fully relieved after following the
steps above, VERY SLOWLY loosen tip guard retaining
nut or hose end coupling to relieve pressure gradually,
then loosen completely. Clear hose or tip obstruction.
Tools Needed
• Vise
• 12-inch adjustable, open-end wrench (2)
• Hammer, 20 oz. maximum
• Small screwdriver
• Throat Seal Liquid
• Pick or long small screwdriver
Cleaning and Inspecting Parts
• Clean and inspect all parts. Replace worn or dam-
aged parts.
• Remove and clean the sleeve when you are repack-
ing the pump.
The system pressure must be manually relieved to pre-
vent the system from starting or spraying accidentally.
To reduce the risk of an injury from accidental spray
from the gun, splashing fluid, or moving parts, follow
the Pressure Relief Procedure whenever you,
• are instructed to relieve the pressure
• stop spraying
• check or service any of the system equipment
• install or clean the spray nozzle.
Never use a sharp or pointed tool to remove sleeve
or other components which could result in pump rup-
ture and cause serious bodily injury. If the sleeve
cannot be removed easily, return the sleeve and cyl-
inder to an authorized Graco distributor for removal.
Component What to look for
Ball seats in intake valve
and piston nicks or wear
Inside sleeve worn or scratched
Piston rod worn or scratched