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9.
HYDRAULICS
The rotary broom can be connected in two different ways, either with two (figure 1) or four (figure 2) hoses. When
connecting with two hoses, the hydraulics of the basic machine is connected to quick connectors and a separate switch
is used to choose whether the broom is rotated or turned. When connecting with four hoses, a rotation cylinder and the
rolling of the engine are connected separately to the hydraulics of the basic machine. This means that the lifting and
rotating of the broom can be done with the hydraulics of the basic machine, and no separate control valve is needed.
The rotation speed of the broom is adjusted with the valve shown on figure 1. The suitable position is usually found
between 5 and 8. If there is a flow controller in the basic machine, the speed control valve can be set to position 10.
The shock absorber cylinder, which is inside the chassis, must be air-free if it needs to be released, so the cylinder must
be moved to its maximum positions when it is attached to the system. If there is air left in the cylinder, the shock
absorption does not work, and t
he broom starts to “jump”.
Also, a too slow a rotation speed of the broom causes the
broom to “jump”
The rotary broom is equipped with a complex closed hydraulic system, which has been tested and adjusted by the
manufacturer. Any repairs to the system are to be performed by replacing one component at a time by a professional in
hydraulics. Any alterations or modifications to the hydraulic system are on the sole responsibility of the client.
Figure 1. 2-hose hydraulics
A - Base machine control block
B
–
4/3-valve
C
–
Turn cylinder
D
–
Brush roll motor
E
–
Flow control valve