horsch Tiger AS Series Operating Instructions Manual page 68

Check the fan impeller and the protective grid
¾
regularly for dirt deposits and clean.
The tractor must be equipped with a flow control
valve to control the fan speed. The fan speed is
adjusted via the oil quantity on the flow control
valve in the tractor.
The hydraulic pump must deliver suf-
ficient oil to prevent the fan speed drop-
ping, even when the tractor speed drops
or other hydraulic functions are activated.
Checks and maintenance
Ensure a free flow return pressure of max. 5 bar.
¾
Clean the air intake grid at regular intervals to
¾
prevent a restriction in air flow and resulting
blockage.
Clean any dirt or deposits from the fan blades
¾
to prevent unbalance and damage to impeller
and bearing.
Retighten the clamping taper on the fan shaft
¾
(see Retightening the fan flange).
Fan motor
The return line connected to the tractor must be
a free flow return!
Return flow pressure max. 5 bar!
Rotation speed max. 3500 rpm
Fan motor
60
Retightening the fan flange
The clamping taper fixates the fan wheel and
additionally clamps on the drive shaft.
The clamping taper on the fan drive may come
loose. The impeller can thus move along the
drive shaft and damage the fan.
After approx. 50 hours retighten the
clamping taper on the fan flange and
check it annually.
Clamping taper
Please note:
When tightening the screws, especially with
¾
a new assembly, the fan wheel will move
towards the protective grill.
A loose flange must therefore be aligned
¾
closer to the hydraulic motor.
The clamping faces must be free of oil and
¾
grease.
The clamping screws must be tightened uni-
¾
formly and in several steps. Tightening onto
the taper should be supported by light ham-
mer blows on the flange (plastic hammer or
hammer shaft).
The inch screws in design No. 10 - 24 4.6 must
¾
only be tightened with a torque of max. 6.8 Nm.
After tightening check the impeller for free and
¾
even running.