Electric Suction Unit

For sprayers with a single pump and automatic tank filling, the electric suction unit comprises an electric (2-way ball) valve for automatic filling (A), a manual (3-way ball) suction valve (B), a suction filter (C) and a filling hose connection (D). The liquid will always flow through the suction filter (30 mesh) in order to protect the pump against contamination in the liquid. The 30 mesh suction filter has a mesh width of 420 micron (0,42 mm).

The electric filling valve(s) can be controlled automatically by the automatic filling system of the GreenStar sprayer control system or "manually" with the EHC-2 control box.

During the automatic filling mode, the filling valve(s) are switched to suction from the external source (filling hose) as long as the actual tank volume is lower than the desired tank volume. As soon as the desired tank level is reached during filling, the filling valve(s) will be switched automatically to suction from the solution tank to stop filling and start agitation. During automatic filling the MAN/AUTO dial switch (14) for the filling valve(s) on the control box needs to be in AUTO position. If the MAN/AUTO dial switch for the filling valve(s) (14) on the control box is in MAN position, it is possible to control the filling valve(s) with switch (16). If the filling valve(s) switch (16) is up, the pump(s) can aspirate liquid from the solution tank (spraying, agitating). If the filling valve(s) switch is down, the pump(s) can aspirate liquid from the external source (filling) or clean water from the rinse tank (rinsing).

The position of the manually operated 3-way suction valve(s) determines the source from where the liquid is aspirated if the filling valve is not on aspiration from the solution tank. A decal with symbols is fitted on the protective cover in front of the ball valve(s), showing the various positions of the 3-way suction valve(s) of the pump(s). The position of the arrow on the handle of the 3-way suction valve indicates the direction from which the liquid is sucked. Please see also "Function diagrams of sprayers with automatic filling" in this section.

A-Electric valve for automatic filling
B-Manual suction valve
C-Suction filter
D-Filling hose connection

WZ00232,0000015 -19-12OCT06-1/4

The suction filter(s) must be cleaned regularly (after each use). Cleaning the suction filter can be done by switching the electric filling valve(s) to external suction (switch 16 down) and closing the manually operated 3-way suction valve(s), unscrewing filter cup(s) (B) and removing filter element(s) (A). Regular cleaning of the filter will prevent blockage through silting up. Silting up can cause excessive vacuum in the suction line to the pump, resulting in increased wear of the pump.

With the optional suction filter with drain tap (WZ1845085), the remaining liquid in the filter cup can be drained first by opening tap (C).

A-Filter element
B-Filter cup
C-Drain tap

WZ00232,0000015 -19-12OCT06-2/4

A filling hose can be attached to the external connection point. The external connection point has 2" female thread. The trailed sprayer is fitted with either a camlock (quick release coupling) , Fire Service or B/C-coupling (Storz). These male couplings are screwed in the thread and have a blind cap to close the filling connection if no filling hose is connected.

Use the correct diameter filling hose, as too narrow a filling hose will cause excessive wear to the pump. Make sure couplings and hose connections are kept clean, to ensure effective sealing. If this is not the case, air will be sucked in which may damage the pump.

The 2" filling hose supplied by John Deere is not fitted with couplings. A separate kit with a female coupling and hose barb with either a camlock (quick release coupling) , Fire Service or B/C-coupling (Storz) is supplied together with the filling hose. These couplings have to be fitted to the filling hose. The filling hoses (A) are 6 or 9 meters long, and are fitted with a strainer (B) and float (C).

A-Filling hose
B-Strainer
C-Float

WZ00232,0000015 -19-12OCT06-3/4

It is not possible to drain the tank via the suction valve. An operator error could result in an open connection between the tank and the external connection point and the tank could drain out to the environment. This could have serious consequences for the environment if the tank was filled with spraying solution. A separate drain ball-valve (A) is fitted between the solution tank and the suction valve. The arrow on the handle of the drain valve indicates the position of the ball valve with L-bore. The decal (B) beside the drain valve shows the function. If the arrow on the handle of the drain valve is pointing down, the solution tank can be drained after removing the security plug. If the arrow on the handle of the drain valve is pointing up, the liquid from the solution tank can be aspirated via the suction valve to the pump. If the handle is in a horizontal position, aspiration of liquid from the solution tank is not possible. This position should never be used when the pump is running or damage to the pump could occur (pump running dry).

A-Drain valve
B-Decal drain valve

WZ00232,0000015 -19-12OCT06-4/4