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28 unigreen
TABLE 7 TABLE OF PROGRAMMED MAINTENANCE
OPERATION 8 h 50 h 300 h END
OF SEASON
Check the level and state of the oil 0
Check the accumulator pressure 0
Check the suction (hoses, pipes, unions) 0
Check and clean the suction 0
and delivery filters
Check the pump fixing feet 0
and screws in general
Check the diaphragm and the oil X (1) X (2)
and change if necessary
Check the suction/delivery valves X X
Check the pump screws and bolts are tight X
Check and clean the nozzles and the non-drip diaphragm 0
Check the wear of the nozzles 0
Check the hydraulic oil level 0
Check any failures or cracking of the welds, 0
especially on herbicide booms
Grease the articulated joints and the wheel hubs 0
Check the tyre pressure 0
NOTE: 0 Operation to be carried out by the operator
X Operation to be carried out by a specialised technician or in an authorised workshop
(1) First oil change
(2) Change at the same time a changing the diaphragm
TABLE 8 PROBLEMS, CAUSES AND SOLUTIONS
PROBLEMS CAUSES SOLUTIONS
The pump won’t charge Air suction Check the suction system
Adjustment valve closed Position the lever correctly
(Command group isn’t at
zero pressure)
Valves and/or valve seats Replace or clean ( * )
suction and delivery worn
or dirty
The pump doesn’t reach the set Valve and/or valve seat Replace ( * )
pressure adjustment worn
Valves and/or valve seats suction Replace or clean ( * )
and delivery worn or dirty
Insufficient rpm Bring speed up to correct rpm
always in the field of 350 ÷ 550 rpm.
The nozzles used are worn or have Replace
holes that are too big
Suction blocked Clean the cartridge of the
filter or remove the blockage
Irregular pressure (with impulses) Valves and/or valve seats Replace or clean ( * )
suction and delivery worn
or dirty
Air suction Check the suction system
Excessive vibrations at delivery Pressure accumulator discharged Bring the air pressure back up to the right
or incorrect air pressure value (see pump handbook) ( * )
Noisiness and the level of the oil Blocked suction Check the suction system
has dropped
Water in the oil Breakage of one or more diaphragms Replace ( * ) If the replacement isn’t
done immediately, drain the water out
of the pump and introduce clean oil
without water (also used) or diesel to
stop rust attacking the internalparts
No liquid comes out of the nozzles Delivery filter dirty Clean
Non-drip filters dirty
Nozzles blocked
NOTE: ( * ) Only specialised technician