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ELECTRO-HYDRAULIC
SCHEMA OF ELECTRO-HYDRAULIC,
EHR 4 - BOSCH
Hydraulic pump (1) delivers oil into the
selective control valve (2) from this into
the regulation distributor (3). Distributor
controls cylinders of hydraulic arms
(4,5). Hydraulic arms are linked with
lower lifting links of three point hitch.
Agricultural implement attached in the
three point hitch is lifted, lowered or kept
in the desired position with regard to the
tractor.
Electronic
control
unit
(6)
receives signals from tensometer pins
(7) and (8) by electrical way. These
signals are compared with the required
value that is set in the control panel (9).
Comparing the required and real value
brings the regulation deviation that is
transferred into regulation distributor (3).
This distributor is controlled by means of
two proportional electro-magnets. Lifting
and lowering is independent on the load.
F 174
122
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