PROBLEMS AND SOLUTION
www.larius.com
34
SIRIO 60:1
ED.
04 - 11/2020 - Cod. 150170
Always close the compressed air supply and release the pressure in the plant before performing any check or
replacement of parts of the pump.
Problem
Possible cause
Solution
The pump does not start
Feed air not sufficient;
Check on the air supply line. Increase
the diameter of the feed hose;
Outlet product line clogged;
Open the recirculation tap to check
whether the pump starts up. Unscrew
the high pressure filter and clean/replace
the filter sieve. Clean/replace the spray
gun’s filter.
Clogged product intake line;
Clean the suction filter;
Pneumatic motor blocked in the cycle
reversal position;
Reduce feed air pressure;
Disassemble the motor and verify;
There is no product;
Add the product;
Accelerate working and no pressure
of the pump
The pump sucks air;
Check the flexible suction tube;
Gaskets of the pumping rod worn;
Replace the lower gaskets;
Suction valve worn or partially clogged;
Disassemble the suction valve. Clean
and/or replace, if possible, the parts
worn;
Suction filter clogged;
Clean/replace the suction filter’s two
disks;
Suction filter too fine;
Remove the fine disk, leaving only the
larger one inside;
Gaskets of the pumping rod worn;
Replace the lower seals
The pump functions, but doesn’t stop
when the chamber is full (the pump
continues slowly, increasing and/or
decreasing)
Suction valve worn or partially clogged;
Disassemble the suction valve. Clean
and/or replace, if possible, the parts
worn;
Delivery valve worn or partially obstructed;
Remove the delivery valve and clean/
replace any worn parts;
Upper gaskets worn.
Tighten the packing nut.
The pressure of the material is si-
gnificantly reduced when the trigger
is pressed
The spray gun’s nozzle is too large or worn
Replace it with a smaller one
The spray gun’s filter and the material
output filter’s sieve are too fine
Replace them with filters of a larger
mesh size
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