English – 43
Hydraulic couplings, pipes and hoses
Hydraulic pipes must always be loosened at both
ends when dismantling.
It is essential to use 2 tools, of which one is used as a
counterhold, both when loosening and tightening
hoses, so that the hose is not exerted to tensional
stress or rotation when tightening. Elbow nipples can
fail or cracks occur when loosening or tightening
without counterhold.
When assembling hydraulic lines, rst tighten until the
tapers make contact, i.e. as far as can be tightened
easily. Then tighten a further one and a half ats. Do
not tighten further.
Always check and note how hose, lines, pipes, etc.
are tightened throughout the product before
loosening or dismantling. They must always be
retted with the same tightening force.
Always check when assembling hoses and lines, that
they go clear of locations where they can be exerted
to chang and wear.
Always check after retting hoses, lines, pipes, etc.,
that there is no leakage. Pressure to the hydraulic
system is provided by the pump of the drive system. A
pressure limiting valve limits the maximum system
pressure to about 30bar/435.114 PSI.
There is a lter in the hydraulic tank for the suction
pipe of the pump.
A hydraulic oil lter of the spin-on type is used to lter
impurities.
The control valve is a slide valve. The lever is found in
the lever housing to the rear and is connected to the
slider. Pressure supply and exhaust takes place via
the valve block. Hydraulic oil for the lift cylinder is
provided via 2 hoses.
The hose’s nipple for the cylinder’s piston side is
equipped with a throttle. Between the slider and the
throttle, there is a mechanically controlled return
valve. The purpose of the rear valve is to contain the
oil so that the cutting deck does not lower when the
lever is not activated.
The lift cylinder is a double-action hydraulic cylinder,
and is connected to the shaft of the lever housing.
The power steering is described in “4.3 Steering” on
page 15.
Hydraulic system
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