Troubleshooting - Graco Dyna-Star 236-753 Instructions And Parts List

Pressure Relief Procedure
To reduce the risk of serious bodily injury , including
fluid injection, injury from moving parts, and splashing
in the eyes or on the skin, always follow this procedure
whenever you shut of f the pump, when checking or
servicing any part of the dispense system, when in-
stalling, cleaning or changing dispense valve nozzles,
and whenever you stop dispensing.
1. Close the supply line shutof f valve, and then the
return line shutoff valve.
2. Open the dispensing valve to relieve pressure.
PROBLEM
Pump won't run.
Pump speeds up or runs erratically. Pump piston and/or intake
Pump runs, but output low on up
and/or down stroke.
Pump runs but output low on both
strokes.
Excessive weepage from porous
plug (B).
Hydraulic oil leaks from fittings in the
upper or lower reciprocator blocks
(53, 47).
Troubleshooting Guide
WARNING
CAUSE
Closed dispense valve.
Pressure too low.
Insufficient hydraulic fluid supply.
Clogged fluid outlet line, intake
valve, dispense valve, suction line.
Motor stalled.
Reciprocator damaged.
valve worn.
Empty supply container.
Pump piston and/or intake valve
worn.
Insufficient hydraulic fluid supply.
Pressure too low.
Clogged fluid outlet line, intake
valve, dispense valve, suction line.
Worn throat seals..
Fittings (16,17,25) are loose, or their
o–rings are worn or damaged.
3. Place a container under the drain valve to catch
any drainage. Open the pump outlet drain valve.
4. Leave the drain valve open until you are ready to
pump again.
If you suspect that the nozzle or hose is completely
clogged, or that pressure has not been fully relieved af -
ter following the steps above, very slowly loosen the
hose end coupling to relieve pressure gradually. Clear
the obstruction.
SOLUTION
Pump only runs with valve open.
Increase supply pressure using the
pressure adjusting valve.
Check hydraulic supply . Adjust to a
maximum of 3 gpm (11 liter/min) flow.
Relieve pressure. Check; clear
obstructions.
Press reciprocator reset button. Pump
should start immediately!
RESET
BUTTON
Repair. See page 12 or 15.
Relieve pressure. Check and repair .
See page 17.
Refill and reprime. Do not allow pump
to run dry. Monitor closely or use a low-
level cutoff valve.
Relieve pressure. Check and repair .
See page 17.
Check hydraulic supply.
Increase supply pressure using the
pressure adjustment on the control.
Relieve pressure. Check; clear
obstructions.
Repair. See page 10.
Tighten the self-sealing fittings. If leak-
ing persists, change the o–rings.