Stiga Park Series Workshop Manual page 59

Edition Manual
2014-09-20 Workshop Manual, GGP Park 4 Hydraulic system
Lowering
Operation state:
• Motor is running in full speed.
• The steering wheel is actuated or not.
• The implement lifter lever is activated upwards.
The operator has actuated the hand lever (10) to its lowering position (one step forwards),
which moves the slide (9) to change the hole pattern between the connections in the valve.
The hole pattern is adapted for the lowering procedure (crossed in the figure below). Oil
forces through the non-return valve (8), through the slide (9) and presses back the piston
into the hydraulic cylinder (11).
In this arrangement, the implement is forced down, irrespective its weight.
When the piston in cylinder (11) has reached its bottom position and the hand lever still is
activated, the oil will flow only through the valve (6) and a noice will be heard from the valve.
When the hand lever is released, valve (9) will reurn to its normal position and the system
switches over to its normal state. The piston in the hydraulic cylinder (11) is then locked in
its actual position.
Chapter Page
16