PRONAR T669XL, Operator'S Manual, Page: 54 / 135

Pronar 669XL, Pronar T700XL SECTION 3
3.14
3.2.7 HYDRAULIC SYSTEM OF THE SUPPORT (OPTION)
The parking stand hydraulic system extends the stand to support the trailer disconnected
from the tractor or when it is parked in the garage after use. Using parking stand hydraulic
system, the drawbar height can be adjusted when hitching and unhitching the trailer. The
parking stand is supplied with oil by the tractor's hydraulic system. The parking stand is
extended or withdrawn by extending or withdrawing a hydraulic cylinder.
FIGURE 3.10 Design and diagram of the hydraulic system of the straight support
(1) hydraulic cylinder, (2) spring, (3) valve, (4) support foot, (5) quick coupler - plug, (6) plug
cap (red)
The trailer can be equipped with straight hydraulic support – figure (3.10) or folding hydraulic
support – figure (3.11).
Hydraulic oil manifold of the tractor's external hydraulic system is used for controlling the
support's hydraulic cylinder. If the handle is shifted perpendicularly to valve (3), the support is
locked in fixed position. The support is lowered by shifting the valve handle to open position,
i.e. along the valve. Hydraulic oil supplied from the tractor's hydraulic manifold extends the
cylinder rod to a desired height. After the pressure in hydraulic conduit is reduced, withdrawal
of the straight support to transport position is forced by means of springs - Figure (3.10). The
hydraulic conduit for controlling the support is terminated with a quick coupler - plug (5) and
protected by means of a cap (6).