Graco Hydra-Clean 206–515 Instructions-Parts List Manual page 9

General
See Fig. 2. Check the air line lubricator often and keep
it filled with oil. Also check the pump packing nut
regularly to keep it just tight enough to stop leakage,
but no tighter. Use a 1/4 in. (6.3 mm) diameter rod to
tighten.
Proper packing nut take-up will stop leakage. However,
all the packings should be replaced after 1000 hours
of operation or delivery of 120,000 gallons of solution
at 2 gpm. Use Repair Kit 206–923.
Accumulator Repair
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.
NOTE: Before disassembling the accumulator (7),
check the air valve for leakage. Remove the air valve
cap and recharge the air chamber to 0.58–1.36 MPa
(5.78–13.6 bar, 85–200 psi). Wet the valve stem with
saliva and watch for bubbling, indicating leakage. If
leakage it detected, replace the valve core – release
the air pressure first by depressing the valve core
plunger pin.
Service
1. Shut off the air supply to the pump and relieve the
pressure. Release air pressure in the accumulator
by depressing the valve core plunger pin. Discon-
nect the spray hose and remove the accumulator
from the pump.
2. Screw the inlet adapter out of the housing and
remove the o-ring, poppet, and spring. Screw the
housing off of the cylinder. Take the piston out and
remove the bearings and seal. Clean all parts and
inspect for wear and damage, replacing as neces-
sary. Check the piston and cylinder wall for pitting
or scoring. Check the valve seat in the inlet adapt-
er for wear or damage.
3. Lubricate the piston seal, and reassemble the
accumulator. Remount the accumulator on the
pump and reconnect the spray hose. Charge the
accumulator to 0.58–1.36 MPa (5.78–13.6 bar,
85–200 psi). Start the pump and check for air or
liquid leaks.