308113
9
Troubleshooting – Dispense Valve
Problem
Cause
Solution
Lubricant continues to flow
after the trigger is released.
Valve may be out of adjustment.
Adjust the valve.
Valve spring is weak, o-rings are worn, or
valve poppet is unseated.
Check internal valve parts.
Lubricant leaks past the push
rod packing (12).
Push rod or packing is worn.
Replace push rod or packing.
Service
NOTES:
D
Relieve the pressure
before you service the
control valve.
WARNING
To reduce the risk of serious injury, when you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 7.
D
Refer to the
Parts Drawing
on page 10 when you
service the control valve.
D
Clean and check all parts thoroughly after you
disassemble them, and replace worn or damaged
parts.
D
The reference numbers and letters in parentheses
in the text correspond to the numbers and letters in
the text, parts drawings, and parts lists.
Clean the Strainer Frequently
Relieve the pressure.
Remove the swivel (19), and
unscrew the strainer (19a). Clean the filter in mineral
spirits. Reassemble, and torque the swivel to 19 to 21
ft-lb (26 to 28 N-m).
Adjust the Valve
Loosen the locknut (8). Turn the adjusting screw (9) in
or out as needed. To stop the fluid flow, all of the pres-
sure of the screw (9) against the push rod (20) must
be released.
When the valve handle is properly adjusted, there is a
small amount of free play. After you adjust the valve,
hold the adjusting screw in place, and securely tighten
the locknut.
Check Internal Valve Parts
Relieve the pressure.
Disconnect the valve from the
hose. Remove the valve plug (22). Several other
parts will come out with the plug. Clean the valve cav-
ity and seat (18). Inspect the seat for nicks. If the
seat is damaged, send the valve to a Graco-authorized
service center for repair. If the seat is not damaged,
reassemble the valve.
Replace Push Rod or Packing
Relieve the pressure.
Disconnect the valve from the
hose. Push out the pin (2) of the trigger latch. Swing
the trigger out of the way. Remove the guide (10),
gasket (4) and push rod (20). Use a dull instrument to
remove the packing (12). Install a new gasket, and
reassemble the valve.
WARNING
Use only genuine Graco replacement parts. The
use of any other parts may impair the intrinsic
safety of this meter. This could result in a failure,
which could cause serious bodily injury and/or
substantial property damage.
