Service Manual
Hako GmbH
Technical Service (KUD) 23843 Bad Oldesloe
Edition: 05/2014
Confidential - For internal use only!
5.3 Brief Description of Work Hydraulic
Work hydraulic is responsible for supply of the side brushes and the lifting cylinder of the hopper lift-out system.
A gear pump (driven by V-belt) delivers hydraulic fluid from the tank to the combined control valve. As long as no specific function is
set, the fluid flows back into the tank. For operation of side brush, the “upper” partial valve is shifted downwards by actuation of the
side broom lever to allow the fluid flowing to the side broom motors for driving them. For emptying of the dirt hopper, a safety circuit
(two-hand operation) is provided for which the “upper” partial valve has to be switched upwards by the broom cylinder operating lever
while, simultaneously, the hopper lever allows switching of the “lower” partial valve upwards. Then the fluid flows from the pump
through the “upper” to the “lower” and then to the piston side of the lifting cylinder. The hopper is then lifted-out. For lowering, actuation
of the hopper lever to the other side (valve switched downwards) is sufficient.
Side broom 1
2
nd
side broom,
optional
Side broom
speed shift
optional
