28
Re-tightening the fan impeller
The conical clamp on the hydraulic motor fan
drive can become loose due to temperature
fluctuations and material deposits on the impel
-
ler. The impeller can creep along the drive shaft
and destroy the fan.
The conical clamp should, therefore, be
re-tightened after approx. 50 operating
hours and checked once per year.
To do this, the fan guard must be removed.
The conical clamp fixes the impeller in position
and, at the same time, clamps firmly onto the
drive shaft.
Conical clamp
When re-tightening the clamping screws, atten-
tion must be paid to the following.
¾
When tightening the screws, particularly when
re-assembling, the impeller creeps towards
the housing in the direction of the guard.
¾
Therefore a loose flange must be aligned
closer to the hydraulic motor.
¾
The clamping surfaces must be free of oil
and grease.
¾
The clamping bolts must be tightened as
evenly as possible in several steps. In be-
tween, tap the flange lightly (plastic hammer
or hammer handle) to facilitate mounting on
the cone.
¾
The imperial screws in the version
no. 10 - 24 4.6 must be tightened to a max.
torque of 6.8 Nm.
¾
After tightening, check the impeller for free
and even running.
