Component Locations - Husqvarna Rider ProFlex 21 II Workshop Manual

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Component Locations

Hydraulic system, components
1. Power steering
2. Pump in hydrostatic transmission
3. Hydraulic oil filter
4. Lift cylinder
5. Pressure limiting valve
6. Control valve for lift cylinder
Pressure to the hydraulic system is provided by the hydrostatic pump. A pressure limiting valve limits the
maximum system pressure to about 45 bar/630 PSI.
A hydraulic oil filter of the spin-on type is used to filter impurities. There is also a filter in the hydrostatic
transmission. Both filters work together to keep the system as clean as possible.
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 two 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 return valve is
to contain the oil so that the cutting unit doesn't lower when the lever is not activated.
The lift cylinder is a double-action hydraulic cylinder, and is connected to the lever housing's shaft.
The power steering is described under Steering on page 23.
HYDRAULIC SYSTEM
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