www.graessner.de
gmb / BA PowerGear_EN
Page 12 of 20
7.4 Fitting of motors
The gear unit types FL and FH
are equipped with a hollow shaft with keyway on the input side. The bore fitting
is designed in quality H7.
The motor shaft must always be positioned and fitted in alignment with the
motor shaft
. Coat the shafts with assembly paste, then join up motor to the gear shaft. Do not drive in the
motor with a hammer but use the suitable holes and threads on the gear unit and motor to tighten the mounting
screws on the flange surfaces until the motor is tight. If there is stress on the bearings, the motor will spring
back easily. Repeat the procedure until the motor and gear unit rest against the flanges without distortion and
the shafts can be easily rotated.
Attention against damage to gear unit:
Driving the motor with a hammer can cause damage to the gearbox.
Any stress or tension on the bearings may cause them to overheat and lead to bearing
damage with blockage.
Drive with lantern and coupling
a. Preparation
The surfaces of the coupling bores and the shaft ends must be free from dirt, especially from grease and oil.
b. Installation of the coupling
The radially arranged clamping screw of the coupling half to be mounted is turned to the left until the screw
head rests against the cross pin mounted in the counterbore. By turning the screw further, the coupling bore is
elastically widened so that the coupling can easily be pushed onto the shaft. Proceed in the same way for
disassembly.
Clamp screw and cross pin:
Turn screw to the left until the
screw head rests against the
cross pin. Turning the screw
further to the left expands the
coupling.
ATTENTION:
Only expand the
coupling sufficiently to allow it
to be mounted, otherwise
there is a risk of breakage.
Coupling widened
for fitting.
Coupling bores must be
free from dirt and grease.
After assembly, tighten
the clamping screw to the
required tightening
torque.
Tightening torques of the clamp screws
Screws: DIN 912, 10.9, galvanized
M4
M5
M6
M8
M10
5 Nm
10 Nm
14 Nm
35 Nm
65 Nm
7.5 Installation of the other fitted components
The drive and output elements (gears, belt wheels, jointed shafts etc.):
▪
Must have been balanced with G 6.3
▪
Must only be fitted using suitable fitting and withdrawal devices
▪
Must be axially secured even if they have been shrunk on
When using suitable clamping elements, the tightening torques must be observed.
The components must be mounted on the shaft as far as specified in the dimension sheet for the article.
In the case of belt drive, the correct belt tension must be ensured, the manufacturer's instructions
must be observed. The permissible transverse forces for the shafts must not be exceeded (see catalogue).
Input and output elements must be covered with a contact protection.
