| 摘要 |
1. A hydraulic system of the drive and the adjustment of brushes in automatic car washes with brushes powered by hydraulic engines powered from hydraulic pumps characterised in that the pressure conduit (7) from the pump (1) to the engine (3) is also connected with the area under the piston of the servo-motor (10) pressing up the brush (4) to the surface being washed, and the pressure conduit (9) from the pump (2) is connected with the area above the piston of this servo-motor.<IMAGE>
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