Operation; Pressure Relief Procedure; Prime The Pump; Shutdown - Graco Viscount High-Flo Plus 25E933 Instructions-Parts List Manual

Operation

Pressure Relief Procedure

Follow the Pressure Relief Procedure when-
ever you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
splashing fluid and moving parts, follow the Pressure
Relief Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
1. Shut off the hydraulic supply line shutoff valve (S)
first, then the return line shutoff valve (R).
2. Open the dispensing valve, if used.
3. Open all fluid drain valves (U) in the system, having
a waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to pump
again.
NOTICE
When shutting down the hydraulic system, always
shut off the hydraulic supply line shutoff valve (S) first,
and then the return line shutoff valve (R) to prevent
over pressurizing the motor or its seals. When starting
the hydraulic system, open the return line shutoff
valve first.
3A6939B

Prime the Pump

Do not allow the pump to run quickly for a long period
of time as this may damage the packings.
NOTE: Sealed 4-ball lowers with bellows do not require
Throat Seal Liquid (TSL).
1. Close the flow control valve (T) by turning knob
counterclockwise, reducing pressure to zero. Close
the supply line shutoff valve (S) and the return line
shutoff valve (R). Also verify that all drain valves (U)
are closed.
2. Check that all fittings throughout system are tight-
ened securely.
3. Start the hydraulic power supply.
4. Open the return line shutoff valve (R), then the sup-
ply line shutoff valve (S). Slowly turn the flow control
valve (T) clockwise, increasing pressure until pump
starts.
5. Cycle pump slowly until all air is pushed out and
pump and hoses are fully primed.
6. Close the fluid shutoff valve (D) downstream of the
pump. The pump should stall against pressure.
NOTE: In a circulation system, the pump operates con-
tinuously until the power supply is shut off. In a
direct-supply system, the pump starts when the dis-
pense valve is opened, and stops when the dispense
valve is closed.

Shutdown

Follow the Pressure Relief Procedure, page 9.
Operation
NOTICE
9