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from DEUTZ-FAHR AGROTRON 80 AGROTRON 85 AGROTRON 90 AGROTRON 100 AGROTRON 105 MK3 Workshop Manual - PDF
2.3 TRAILER BRAKING SYSTEM
The tractor may be equipped with one of the four following trailer braking systems: 1. hydraulic trailer braking (Italy version) 2. hydraulic trailer braking (Export version) 3. air trailer braking (Italy version) 4. air trailer braking (Export version)
2.3.1 HYDRAULIC TRAILER BRAKING (ITALY VERSION)
Freno a manoHand brake
3
P 1
1 Y
2 E
B N 2
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1. Valve activation lever in position “1”
• When the lever (1) is in position “1” (valve activated) and the brake pedals are not pressed, a pressure of 12.5 bar (181.3 psi) is available at port B. • This pressure is supplied constantly to the trailer to release the parking brake. • When the operator engages the parking brake, the solenoid valve (2) is energised; this nullifies the pressure at port B. • The pressure at port B is directly proportional to the pressure present in the tractor braking circuits Y.
2. Valve activation lever in position “O”
• When the lever (1) is in position “O” (valve deactivated), there is no pressure at port B. In this condition, the pressure at port B is always null independently of the pressure in the tractor braking circuits. As a result, the pressure switch (2) detects the lack of pressure and illuminates the indicator light (3) on the dashboard.
