Graco 127642 Instructions Manual page 15

O PROBLEMS AND SOLUTIONS
For any problems contact the authorised dealer nearest to you.
PROBLEM POSSIBLE CAUSE
Lack of electric power
THE MOTOR IS NOT
Rotor jammed
TURNING
Motor problems
THE MOTOR TURNS Low voltage in the electric
SLOWLY WHEN START- power line
ING
Low level in the suction tank
Foot valve blocked
Filter clogged
Excessive suction pressure
High loss of head in the
delivery circuit (working with
the by-pass open)
LOW OR NO FLOW
By-pass valve blocked
RATE
Air entering the pump or the
suction piping
A narrowing in the suction
piping
Low rotation speed
The suction piping is resting
on the bottom of the tank
Cavitation occurring
INCREASED PUMP Irregular functioning of the
NOISE by-pass
Presence of air in the fluid
LEAKAGE FROM THE Seal damaged
PUMP BODY
Suction circuit blocked
Malfunction of foot valve fitted
on suction circuit
THE PUMP DOES NOT
PRIME THE LIQUID
The suction chambers are dry Add liquid from pump delivery
The pump chambers are dirty
or blocked
M0307
CORRECTIVE ACTION
Check the electrical
connections and the safety
systems.
Check for possible damage
or obstruction of the rotating
components.
Replace Unit
Bring the voltage back within
the anticipated limits
Refill the tank
Clean and/or replace the valve
Clean the filter
Lower the pump with respect
to the level of the tank or in-
crease the cross-section of the
piping
Use shorter piping or of great-
er diameter
Dismantle the valve, clean
and/or replace it
Check the seals of the
connections
Use piping suitable for working
under suction pressure
Check the voltage at the
pump. Adjust the voltage and/
or use cables of greater cross-
section
Raise the piping
Reduce suction pressure
Dispense until the air is purged
from the by-pass system
Verify the suction connections
Replace Unit
Remove the blockage from the
suction circuit
Replace foot valve
side
Remove the blockages from
the suction and delivery valves
EN
15