Graco 24V641, Instructions Manual

Page: 17 / 68

M0312 17
EN
K TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
THE MOTOR IS NOT
TURNING
Lack of electric power Check the electrical connections
and the safety systems.
Rotor jammed Check for possible damage or
obstruction of the rotating com-
ponents.
Motor problems Replace pump
THE MOTOR TURNS
SLOWLY WHEN START-
ING
Low voltage in the electric pow-
er line
Bring the voltage back within
the anticipated limits
LOW OR NO FLOW RATE
Low level in the suction tank Refill the tan
Foot valve blocked Clean and/or replace the valve
Filter clogged Clean the fil er
Excessive suction pressure Lower the pump with respect to
the level of the tank or increase
the cross-section of the tubing
High loss of head in the delivery
circuit (working with the by-pass
open)
Use shorter tubing or of greater
diameter
By-pass valve blocked Flush the system
Air entering the pump or the
suction tubing
Check the seals of the connec-
tions
A narrowing in the suction tub-
ing
Use tubing suitable for working
under suction pressure
Low rotation speed Check the voltage at the pump.
Adjust the voltage and/or use
cables of greater cross-section
The suction tubing is resting on
the bottom of the tank
Modify tubing properly.
Freezing of the pump or motor. Thaw the pump and check for
damage. Starting a frozen pump
can cause damage to the motor
and to the pump itself
Leaks in the pump outlet pipe. Check the seal at the pipe's con-
nections and inspect the pipe
for possible damage.
INCREASED PUMP NOISE
Cavitation occurring Reduce suction pressure
Irregular functioning of the by-
pass
Dispense until the air is purged
from the by-pass system.
Presence of air in the liquid to be
pumped.
Verify the suction connections
LEAKAGE FROM THE
PUMP BODY
Pump damage Replace pump
AUTO SHUT-OFF FAIL-
URE ON NOZZLE
Low fl w rate of pump Replace pump.
Remove fl w rate restrictions.