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A further cause of issue is rodent damage to cables inside the feeder itself. The sensor cable is small and can be chewed by rodents attracted to
the machine by feed residue within the mechanism. Once the main plug/socket and cables have been checked for issue it may be necessary to
open up the feeder itself to resolve the issue as below;
Procedure
1.
With the hopper empty, unhitch the machine from the towing vehicle. Lift the drawbar into the air so that the machine is tilted
upwards (it should rest on the mudguards with the drawbar in the air)
2.
Remove the belly pan from the base of the machine in order to access the running gear. The belly plan is a flat plate secured using M10
bolts. It may be necessary at this point to clean the inside of the machine to remove feed / mud deposits which may be clogging the
mechanism or making it hard to examine. Use low pressure water and a soft brush if needed. Do not use high pressure water around
the internal wiring and mechanism!
3.
You should not need to remove the slide plate to access the sensor, however f you do need to remove the slide plate for access, this
can be achieved by unclipping the spring from the slide plate and removing the 5 x bearings and associated bolts which locate the plate.
TAKE NOTE OF THE NUMBER OF WASHERS AS THESE NEED TO BE RE-FITTED IN THE SAME ORDER TO ENSURE THE SLIDE MOVES
SMOOTHLY.
4.
Check cabling and wiring carefully for damage from the mechanism or from rodents, and repair / replace as necessary.
5.
The sensor and the magnet should pass each other with approximately 2mm gap between them. The sensor also needs to be aligned
vertically (so that they are approximately level with each other). If required you can bend the sensor support bracket up or down to get
vertical alignment, and you can move the sensor in or out on the slotted holes to get horizontal alignment. Sensor signal can be checked
using a multi-meter – resistance should drop to zero momentarily as the sensor passes the magnet. The sensor can be adjusted and the
mechanism rotated by hand (it will be hard to rotate by hand but will rotate) such that a reliable signal is obtained on the bench prior to
re-fitting into the machine.
6.
Once the mechanism is refitted in the machine, ensure the sensor and control box are working correctly together prior to refitting the
belly plate.
FOR MACHINES USED WITH DUSTY FEED OR FEED WITH ADDITIVES SUCH AS MOLLASES, BUILD UP OF DIRT CAN AFFECT THE SENSOR
OPERATION – IN THIS CASE CLEAN WITH A LOW-PRESSURE WATER JET.
Consult the relevant parts diagram for the sensor part number if spares are required, alternatively contact your distributor.
Brown = 7 = Motor –
Red = 3 = Motor +
Green = 5 = Sensor Cable (zero voltage – not polarity specific)
White = 1 = Sensor Cable (zero voltage – not polarity specific)
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