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Instruction Manual
High pressure piston pumps – Series NMT-EBCW, NMT-EBCH, XLTI-EBCH, XLTI-ESA
Rev. 0
Page 24 of 25
7
TROUBLESHOOTING
7.1
Problems and possible solutions
All troubleshooting interventions must be carried out by authorised and qualified personnel.
This chapter is intended to provide the user with solutions to the problems or malfunctions that may occur more frequently.
Some of these solutions can be implemented by skilled personnel, while others must be performed at Authorised Workshops as
they require using specific tools as well as having an in-depth knowledge of the repair procedures.
Whenever a malfunction is identified on the machine or its components, and the problem has not been
resolved, directly contact the Manufacturer for the necessary information.
PROBLEM
POSSIBLE CAUSE(S)
SOLUTIONS
The pump runs, but it will not
generate noise and pressure.
The pump is not primed and is running
dry.
Check for water in the inlet line.
Check that the delivery line (gun) is open.
Check that the valves are NOT clogged.
The pump runs, but it is excessively
noisy and/or will not achieve the
desired pressure.
The nozzle is either oversized or damaged.
The water supply is not sufficient.
Replace the nozzle.
Clean the filter. Replace the filter with a new one
of suitable dimensions.
Remove any air suction.
Check the dimension of the inlet pipe and
replace it with a larger diameter pipe, if
necessary.
The pressure regulation valve is not
calibrated correctly or it is inefficient.
Calibrate the valve properly.
The piston seals are worn.
Check the condition of the seal housing.
Replace the seals.
The rotation speed is low.
Check the motor and the transmission.
The pump gets pressurised, but the
level of pulsation and vibration is
high.
Foreign matter is present in the valves.
Clean the valves.
The valves are worn.
Replace the valves.
The inlet water temperature is high.
Reduce the water temperature.
The piston seals are worn.
Replace the seals.
The pump is very noisy.
The bearings are worn.
Replace the bearings.
The inlet water temperature is high.
Reduce the water temperature.
Problems are experienced in the pump-
motor coupling.
Check the status of the keys, flexible coupling or
the pulley.
The piston seal life is quite short.
There is cavitation or air in the system.
Check the condition and the dimension of the
inlet pipe and replace it with a larger diameter
pipe, if necessary.
The ceramic piston is damaged.
Replace the piston.
The pressure and/or temperature of the
pumped water is/are very high.
Check the inlet water pressure and temperature.
There is water in the oil.
The ring in the rod-piston oil seal is worn.
If the oil is milky (emulsified), but the level
in the guard does not increase,
condensate may have formed.
Replace the oil seal ring.
Change the oil more frequently.
There is water leaking between the
guard and the head.
The seal pack is worn.
Replace the seal pack.
The piston is worn.
Replace the piston.
The seal in the piston stop screw is worn.
Replace the seal.
There is oil leaking between the
guard and the head.
The ring in the rod-piston oil seal is worn.
Replace the oil seal ring.
