V-Belt; Chain - Siemens MULTIMOBIL 5C Troubleshooting Manual

3. Now using an Allen key, rotate the eccentric pins of the floating bearings in the
clockwise/anticlockwise direction as desired for adjustment. While doing so, keep a
watch on the movement of the C-arm, as the bearing should not go too tight.
4. Once the movement is smooth, tighten the grub screws and lock the bearing pins.
Also check the balancing of the C-arm after the bearing adjustment.
5. Fit the cover complete back and fix the ornamental screw.
7.1.2.2 Adjustment of Support Bearing
For the adjustment of the supporting bearing, following are the procedures
1. Remove the cover complete by removing the grub screws.
2. Loosen the grub screws, which hold the eccentric pins of these bearings, so that
the bearings can rotate.
3. Now, using a screwdriver rotate the pins in the clockwise/anticlockwise as desired
for adjustment. See that the bearings come in contact with the C-arm profile.
During adjustment of the bearings see that both bearings are maintained at same
eccentricity.
4. Once the bearings are adjusted, tighten the grub screws and lock the bearing pins.
5. Fit the cover complete back to in the place.

7.1.3 V-BELT

The V-Belt is used for the transfer of power from the motor pulley to the main pulley. If
the tension in the belt is not sufficient or if it is loose, there will be loss of power due to
slip, resulting in noisy up-down motion, wobbling of the belt, rubbing sound, jerks etc,
which can cause inconvenience to the doctor during operation. Hence the belt has to
be maintained in a tight position.
1. Lift the unit from the rear side and place some wooden support below the rear
wheels so that there can be a access for tightening the belt.
2. Now, remove the front cover of the unit.
3. Loosen the screws of the motor from bottom side of the trolley base.
4. Pull the motor towards the backside so that the belt is under tension. At this point
tighten the screws of the motor.
5. Place the unit back on the floor.

7.1.4 CHAIN

Roll-on chain is used in the steering mechanism. The chain is routed through the
sprockets of two rear wheels, two idler sprockets, and the drive shaft. The chain is in
two halves and there are two adjustable nuts provided to adjust the tension in the
chain.
When the chain is loose, there is a tendency that the chain can slip off from the
sprockets, hence proper tension should be maintained in the chain.
For adjusting the tension in the chain, following are the steps
Siemens Ltd. Med India Version 5.0
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Service Instructions
Multimobil 5C
Page 46 of 73