Jacto ARBUS 400 - Page 95

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MAINTENANCE
ARBUS 400
Table 13: Intermittence
Table 14: Insufficient pressure (partial lack of pressure)
Problemas, causas e correções
Probable causes Indications and corrections
1. Poor rpm on machine drive.
Rpm for driving the machine shall be 540 rpm at the
power take-o (TDP).
2. Closed lter valve (quick shut-o).
Due to the quick shut-o valve construction charac-
teristic, liquid will ow even in the shut position with
the p ump operating; however, the circulation of liq-
uid will be insucient.
3. Filter is partially clogged. The lter must be clean to allow free circulation of liquid.
4. Intake hose is partially clogged.
The pump if not properly fed will cause a pressure drop.
Check the hose connecting the lter to the pump for
buckling.
Check for obstruction the hoses connecting the reser-
voir to the lter. Fill up the reservoir, open the valve
and check whether the water is owing abundantly.
5. Air intake. Check ttings and reservoir outlet sealing rings.
6. Pressure regulator. Check valve seating and seat.
7. Excess ow (nozzle ow in excess of
the recommended limit).
Check whether the nozzle ow rate is within the rec-
ommended limits (refer to ow rate chart). Replace
nozzles with ow rate in excess of 20%.
Use only the nozzle recommended by the manufac-
turer sprayer.
8. Pump with less boosting capability.
Disconnect the pressure hose from the command.
Run the machine under 540 rpm at the PTO.
Collect water for 1 minute. Meter the collected vo-
lume. The volume must be close to the pump rated
value.
JP - 402 = 10 gpm JP - 100 = 26.40 gpm
JP - 42 = 11 gpm JP - 150 = 39.62 gpm
JP - 75 = 19.80 gpm JP - 300 = 79.25 gpm
Probable causes Indications and corrections
1. Filter valve closed (quick shut-o).
Due to the quick shut-o valve construction charac-
teristic, there will be circulation of liquid even in the
closed position with the pump in operation, causing
intermittent circulation of liquid.
2. Pump – poor operation of valves. Valve exhibiting poor sealing due to impurities or seizing.
3. Pump head punctured on the inside. Replace pump head.