5-123
5
M
A
INTE
NAN
CE
ARBUS 1000
Table 17: Intermittence
Table 18: Insufficient pressure (partial lack of pressure)
Trouble-shooting
Probable causes
Indications and corrections
1. Poor rpm on machine drive.
Rpm for driving the machine shall be 540 rpm at the
power take-off (TDP).
2. Closed filter valve (quick shut-off).
Due to the quick shut-off valve construction charac-
teristic, liquid will flow even in the shut position with
the p ump operating; however, the circulation of liq-
uid will be insufficient.
3. Filter is partially clogged.
The filter 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 filter to the pump for
buckling.
Check for obstruction the hoses connecting the reser-
voir to the filter. Fill up the reservoir, open the valve
and check whether the water is flowing abundantly.
5. Air intake.
Check fittings and reservoir outlet sealing rings.
6. Pressure regulator.
Check valve seating and seat.
7. Excess flow (nozzle flow in excess of
the recommended limit).
Check whether the nozzle flow rate is within the rec
-
ommended limits (refer to flow rate chart). Replace
nozzles with flow 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 volume. The
volume must be close to the pump rated value.
JP - 402 = 40 L /min
JP - 42 = 42 L /min
JP - 50 = 50 L/min
JP - 75 = 75 L /min
JP - 100 = 100 L /min
JP - 150 = 150 L /min
JP - 300 = 300 L /min
Probable causes
Indications and corrections
1. Filter valve closed (quick shut-off).
Due to the quick shut-off 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.
