Operating manual
AQUA S.p.A.
ENGLISH
Page 21
GEARBOX OIL CHECK AND REPLACEMENT.
If oil contamination appears during a periodical visual check, it is recommended to move up the oil replacement. Load, drain and level caps are
shown in the picture in paragraph 6.2.
Chemically contaminated lubrificants may cause anormal wear, corrosion and leaks from seals. A complete oil replacement is
much more recommended than simply top up the oil level.
Use mineral oil with ISO viscosity index VG 320 (320 cSt a 40 °C or 23 °E a 50 °C).
MALFUNCTIONS AND POSSIBLE SOLUTIONS
Here below, a non-exhaustive list of commons issues and their possible solutions.
ISSUE
PROBABLY CAUSE
FIX
Unexpected flow rate decreasing
•
Air came in the suction pipe.
•
Check the pipe connection and
tightening.
•
Air trapped on liquid end group
•
Increase and maintain for a
short time the pump
adjustment to 100% to
evacuate the air
•
Exceeding suction pipe high
•
Decrease the length of suction
pipe.
•
Elevated vapour pressure
•
Increase the external suction
head
•
Elevated pumping temperature
level
•
Increase the external suction
head
•
Higher liquid viscosity level
•
Replace the suction pipe with
an over dimensioned
•
Increase the external suction
head
•
Exceeding tight closing or tank
without bleed
•
Execute a hole on the top of
the tank
•
Suction pipe obstructed or
close for interception
•
Check the suction pipe
•
Obstructed Filter
•
Clean or replace the filter.
•
Pump valves are dirt, worn or
assembled in wrong way.
•
Check Cleanliness, worn and
correct valves assembling.
•
Safety valve has set with a
lower pressure.
•
Check if safety valve
discharge.
•
Wrong adjustment set
•
Check ad in case set the
adjustment.
Product leaks
•
If appears between diaphragm
chamber and pump head,
tightening torque is not
adequate with working
pressure.
•
Gradually tight liquid end
screws until eliminate the leak
or reduce the pressure.
•
If appears from the chamber
hole, it reports diaphragm
rupture.
•
Replace the diaphragm.
Irregular or higher than expected flow
rate
•
Required suction pressure is
higher than delivery pressure.
•
Delivery pressure should be at
least 0,3÷0,5 bar higher than
suction pressure.
•
Counter pressure valve is not
able to open cause of
impurities or set with a too
lower pressure.
•
Check counter pressure valve
conditions.
•
Pump valves jammed in open
position.
•
Check the pump valves.
Unmount and clean them
accurately. Eventually replace
the valve groups.
