Siemens 25 Manual de serviço - Página 8

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Service Manual

Maintenance Instructions

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.

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.

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.

Siemens Ltd. Med India

Version 6.0

8-7