Unigreen P500 Problems, Causes And Solutions, Table Of Programmed Maintenance, 50 h

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

unigreen 33