Hitachi 1800 - Manual (Page 14)

Maintenance
14 311826B
Maintenance
Preventive Maintenance
Schedule
The operating conditions of your particular system
determine how often maintenance is required. Establish
a preventive maintenance schedule by recording when
and what kind of maintenance is needed, and then
determine a regular schedule for checking your system.
Wet-Cups
See F IG . 3. Check the wet-cup (AC) daily. Keep the
wet-cup 1/3 filled with Graco Throat Seal Liquid (TSL) or
compatible solvent.
Using the supplied wrench (108), adjust the packing nut
weekly so it is just snug; do not overtighten. Torque to
135-169 N•m (100-125 ft-lb).
Flushing
1. Follow Pressure Relief Procedure, page 12.
2. Remove spray tip and soak in solvent.
3. Place siphon tube in grounded metal pail containing
cleaning fluid.
4. Set pump to lowest possible fluid pressure, and start
pump.
5. Hold a metal part of the gun firmly to a grounded
metal pail. Trigger the gun until clean solvent dis-
penses.
6. Remove gun from hose. See gun manual to further
clean gun.
7. Follow Pressure Relief Procedure, page 12, and
remove fluid filter and soak in solvent. Replace filter
cap.
Corrosion Protection
Always flush the pump before the fluid dries on the dis-
placement rod. Never leave water or water-based fluid in
the pump overnight. First, flush with water or a compati-
ble solvent, then with mineral spirits. Relieve the pres-
sure, but leave the mineral spirits in the pump to protect
the parts from corrosion.
Hydraulic Systems
Carefully follow the manufacturer's recommendations on
reservoir and filter cleaning, and periodic changes of
hydraulic fluid. Use only Graco-approved hydraulic oil.
Order Part No. 169236, 5 gal. (19 liter) or 207428, 1 gal.
(3.8 liter). Do not substitute a lower grade oil or one with
a lower flash point.
• Flush before changing colors, before fluid can
dry in the equipment, at the end of the day,
before storing, and before repairing equipment.
• Flush at the lowest pressure possible. Check
connectors for leaks and tighten as necessary.
• Flush with a fluid that is compatible with the
fluid being dispensed and the equipment wetted
parts.
CAUTION
Keep the hydraulic supply system absolutely clean at
all times. Blow out hydraulic lines with air and flush
thoroughly with solvent before connecting to the
hydraulic motor, to avoid introducing harmful contami-
nants into the motor. Plug the hydraulic lines immedi-
ately when they are disconnected.
Do not exceed 54°C (130°F) hydraulic oil tempera-
ture.