Service Manual
Maintenance Instructions
Siemens Ltd. Med India
Version 6.0
Copyright
SIEMENS LTD. All rights reserved. For internal use only
8-7
The Adjustment can also be achieved with
the help of a fluoroscent screen.
8.9
Checking and readjusting the counterweight
Unlock the support arm and release the turning knob. Without any accessories
attached, the support arm should be easy to move across the entire movement range
and stop in any position. If the arm is not counterbalancing itself adjustments in the
spring tension are required.
8.9.1 Movements
Check arm counterbalancing at all positions.
It should be easy to lift the arm UP or pull it down.
When the single tank does not remain at the required position, tighten the M10 nut on
the bracket. If it still does not remain at the required position the spring tension should
be adjusted for complete balancing. i.e. If the Single Tank moves DOWN from the
required position, the spring tension is to be increased. If it moves UP, then the spring
tension is to be reduced. Refer adjustment instructions.
8.9.2 Adjustment Instructions
Adjusting the balancing of the arm
Carry out the change in the pre-tension of the spring tension
as explained below.
Remove the column cap from the column.
Fully release the supplementary brake on the support arm.
Move the support arm into the horizontal position. Release
the M10 locknut using two 16/17 open end spanners.
If the Single Tank moves DOWN from the required position,
firmly tighten the M10 nut shown in the picture 16/17 open-
ended spanner. Set the spring tension so that the state of
equilibrium is obtained when the support arm is in the
horizontal position, i.e. that the raising and lowering forces
of the tube assembly are the same. If it moves UP, loosen
the M10 nut. Check the balancing and then tighten the
locknut.
