Hawk XLT HT IEX Series, Instruction Manual

Page: 28 / 42

Instructions Manual
High-pressure piston pumps - XLT/XLTI ATEX series
Cod. doc. M.I.01
Rev. 0
Page 28 of 32
This Manual is the property of the Manufacturer; any reproduction in any form, even partial, is prohibited.
7 DIAGNOSTICS
7.1 Trouble Shooting
Troubleshooting should only be attempted by qualified, authorised personnel.
This section aims to offer the machine operator possible solutions for the problems and malfunctions that may occur most
frequently.
Some of the suggested solutions should only be attempted by specialised personnel; others must be carried out by Authorised
Service Centres as they require the use of special tools as well as a detailed knowledge of how to carry out repairs.
In case of failure of the machine or its parts, contact the Manufacturer if you are unable to get the
problem solved.
PROBLEMS POSSIBLE CAUSES SOLUTION
The pump runs but does not
produce noise or pressure
The pump is not primed and is running dry
Check if there is water in the suction line
Check if the delivery (gun) is open
Check the valves are NOT blocked
The pump runs but is too noisy
and/or does not reach the expected
pressure
Oversized or worn nozzle
Insufficient water supply
Replace the nozzle
Clean the filter. Replace the filter with an
appropriate sized filter.
Eliminate any possible intake of air.
Check the size of the suction pipe and replace if
necessary with a larger diameter pipe.
Pressure control valve is not set or
working properly.
Calibrate the valve.
Worn plunger seals
Check the status of the seat of the seal.
Replace the seals
Low speed of rotation Check the motor and the drive
The pump comes up to pressure but
pulsates and vibrates strongly
Foreign particles in the valves Clean the valves
Worn valves Replace the valves
High inlet water temperature Reduce the water temperature
Worn plunger seals Replace the seals
The pump is very noisy
Worn bearings Replace the bearings
High inlet water temperature Reduce the water temperature
Pump-motor connection problems
Check the status of the keys, flexible coupling or
pulley
Short plunger seal life
Cavitation or air in the system
Check the status and size of the suction pipe and
replace if necessary with a larger diameter pipe.
Damaged ceramic plunger Replace the plunger
Excessive pressure and / or temperature
of the pumped water Check the pressure and the temperature of the
inlet water
Water in the oil
Worn plunger – oil shaft seal ring .If the oil
is milky (emulsified), but the level does
not increase in the crankcase, it means
there is condensation
Replace the ring seal
Change the oil more frequently
Water leaking between the
crankcase and the manifold housing
Worn seal pack Replace seal pack
Worn plunger Replace plunger
Worn plunger bolt seal Replace seal
Oil leakage between the crankcase
and the manifold housing
Worn plunger shaft oil seal Replace the seal