Unigreen 22 Table of Programmed Maintenance Operation, 50 h 300 h, PROBLEMS, Causes and Solutions

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

32unigreen