Design, Function of Hydraulic Components
Design, function of hydraulic components
Location of hydraulic components
A Hydraulic unit
A 12 V hydraulic pump is used to supply pressure to the entire system. The system pressure is limited to max. 180 + 10 bars by a pressure limitation valve (DBV). The hydraulic unit has 4 connections (No. 10 roll bar drive, No. 11 test connection, No. 12 top drive, No. 13 return). The hydraulic unit is located in the spare tire recess.
B Hydraulic cylinders
Circuit symbols, cylinder
13 double-acting cylinders and 2 single acting cylinders are used for actuation of the entire system.
Single-acting circuit (A) for the locking pawls on the roll bar with spring return.
Normal cylinder circuit (B) for the functions: top and cloth holding brace.
Differential circuit (C) for the functions: top compartment cover, roll bar and locks. With the cloth top, switch-over from normal to differential operation is accomplished during the closing operation.
A peculiarity of the cover cylinder is that it is equipped with a single, non-adjustable end position damping unit (D) for extension in order to prevent the cover from "fluttering" against the stop when opening.
C Valve blocks
integrated into the valve blocks. In some cases these are consolidated to form one assembly. The allocation of the solenoid valves and the connections is indicated with numbers on the retaining plates.
Y55 Valve block, left
Y56 Valve block, right
Y57 Valve block, roll bar
D Solenoid valves
The solenoid valves consist of 3/2 way solenoid valves designed as insert cartridges.
E Hydraulic line connection fittings
The hydraulic lines are connected to the valve blocks and distributors with rotary slide fittings and to the cylinders with safety slide fittings. The supply lines from the pumps to the valve blocks are fastened with threaded fittings.
F Locks
The locks are designed so that they are locked mechanically in the closed state. The hydraulic system is used only for actuation.
Front lock
Center lock
Rear lock
