User's Manual

13307707
Troubleshooting
WARNING
To reduce the risk of serious injury, including
splashing fluid in the eyes or on the skin, always
follow the Pressure Relief Procedure on page 9
before you check or service the surge tank or
remove the surge tank from the system.
CAUTION
If you replace the diaphragm, do not attempt to make
a new one yourself. Use only genuine Graco parts.
Other materials may not stand up to the pressures
developed in the tank or to the fluid being pumped. A
ruptured diaphragm will release gas into the paint
line.
Problem Cause Solution
Surge tank will not accept a
gas charge.
Plugged restrictor in charge valve
(not applicable for Model 233736)
The restrictor is a safety device that
prevents overpressurization during
charging of the tank. Clean or replace
the restrictor bushing:
Ref. No. 25 on page 17.
Ref. No. 25 on page 18.
Ref. No. 13 on page 20.
Poor pulsation reduction.
Incorrect gas charge pressure Charge the surge tank to recom-
mended air pressure (see Operation
section).
Surge tank undersized for applica-
tion
Reduce working fluid pressure and/or
flow rate.
Install a larger surge tank model.
Install a surge regulator (SR200)
Extended pump change-over time
due to worn or held open check
valves
Repair the piston pump.
Surge tank gas charge bleeds
off
Ruptured diaphragm Replace diaphragm.
o
ff
.
Relaxed diaphragm seal Check flange bolt torques. Re-torque
as necessary. See Parts Drawings
for torque specifications.
Damaged diaphragm seal Replace.
Leaking charge valve or relief valve Replace charge valve or relief valve.