Graco HIGH-FLO 220-569 - Manual (Page 14)

14 307-809
Operation (Hydraulic-Powered Pumps)
Starting and Adjusting the Pump
1. Charge the surge tank, if you are using one. See
the separate instruction manual, 307–707.
2. Open all shutoff valves (D).
3. Turn on the hydraulic power supply.
4. Open the flow control valve (S) all the way.
5. Open the return line shutoff valve first, then open
the supply line shutoff valve.
6. Open the dispensing valve/spray gun at the last
gun station and keep it open while starting the
pump.
7. Adjust the pressure reducing valve (P) until you
get the desired fluid pressure.
8. When fluid is flowing smoothly from the gun,
release the gun trigger.
9. One at a time, open any other guns in the system
to purge air from the lines.
10. With a gun triggered open (dead-end systems
only) or with the pump running in a circulating
system, count the cycle rate of the pump for one
minute. Close the flow control valve (S) until the
cycle rate drops to below the desired cycle rate.
11. Open the flow control valve (S) slowly until the
cycle rate and fluid pressure return to the desired
level. This method of setting the hydraulic controls
ensures proper pump operation and prevents
pump runaway and damage if the fluid supply runs
dry.
12. Release the gun trigger.
NOTE: In a circulating system, the pump operates
continuously until the power supply is shut off. In a
direct supply system, the pump starts when the gun/
valve is opened, and stops when the gun/valve is
closed. The pump always stops on the downstroke due
to the vented inlet seat (32).
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause
component rupture and serious injury,
never exceed the specified maximum hydraulic
input pressure to the pump (see Technical Data
on page 46).
Shutdown
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
Relieve the pressure.
Always shut off the supply line shutoff valve first, and
then the return line shutoff valve. This is to prevent
overpressurizing the motor or its seals.