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ELECTRIC INSTALLATION
from Zetor Tractor Forterra 100 Forterra 110 Forterra 120 Forterra 130 Forterra 140 Operator’s Manual
Checking The Adjustment Of The Front Grill Headlights
During a check on a test wall the tractor must stand on a level surface and the tyres must be inflated to the prescribed pressure. The basic vertical setting is 3.5% at the shipping weight of the tractor. In the horizontal direction the light beams must be parallel with the longitudinal axis of symmetry of the tractor.
l - distance of the test wall from the headlight (5 m) h - height of the headlight centre above the road surface
Δh - headlight inclination (-3.5 %) to the distance of the test wall = 17.5 cm α - raising of the outline of an asymmetrical headlight (15%)
Adjusting The Front Grill Headlights
The adjustment is performed simultaneously with all the screws for the vertical and horizontal direction of the beam. In the adjusted condition all the springs of non-adjusting screws must be pretensioned. Each headlight is adjusted separately. The lamps are replaced by removing from the rear side of the reflector.

Checking The Adjustment Of The Cab Roof Headlights
In the vertical direction there must not be any point of illuminated area lying on the road surface plane to the left from the longitudinal vertical plane passing through the headlight centre further than 30 m from the front outline of the tractor.
In the horizontal direction the light beams must be parallel with the longitudinal axis of symmetry of the tractor.
Check the adjustment of the headlights at the shipping weight of the tractor. The front roof headlights may only be used when driving on public roads when the tractor carries a frontally attached machine or implement covering the main headlights (in the tractor grill).