Pressure Relief Procedure - Graco ToughTek MP-Series Operation Manual

Pressure Relief Procedure

Follow the Pressure Relief Procedure
whenever you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as splashing fluid and moving
parts, follow the Pressure Relief Procedure when you
stop dispensing and before cleaning, checking, or ser-
vicing the equipment.
1. Push the STOP button (U).
2. Remove the applicator tip and tip retainer, and hold
the applicator firmly against a pail.
3. Turn the speed control knob (V) to speed 1.
4. Hold the pump direction switch (W) in the REV
position and push the START button (U).
5. Allow the pump to run in reverse for several sec-
onds while holding the pump direction switch (W) in
the REV position.
3A4349B
NOTE: If the pump is stalled, do not run the pump
for more than five seconds at a time or the motor
control could encounter an overload error. After
multiple attempts to free the pump, allow the motor
to cool for one minute.
6. Push the STOP button (U) after five seconds and
release the pump direction switch (W). The switch
will return to its normal FWD position.
7. Turn the main power disconnect switch (T) to OFF.
8. Allow time for material to drain to relieve any
remaining pressure.
9. If you suspect the applicator or hose is still clogged
or that pressure has not been fully relieved after fol-
lowing the previous step.
a. Starting at the applicator, VERY SLOWLY open
the coupling while maintaining control of both
the applicator and hose.
b. Clear the hose or tip obstruction. If there is still
pressure trapped down the line, work your way
back to the pump by individually opening each
coupling between each hose connection. Main-
tain control of each hose and VERY SLOWLY
open each coupling until pressure has been
fully relieved.
Operation
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