I have old weighted windows. One of the panes of glass is broke.How do I remove the sash so I can get it fixed

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Most of the answers are correct to fix it yourself without taking the sash out. Here is how you would do this:
Measure the glass and purchase new. Exact measurements are critical. An older window will be single pane glass.
Purchase glazing putty, a glazing tool and glazing points. (Points are small metal pins that hold the glass in place while you glaze it).
With a putty knife, carefully remove the old glazing putty while dislodging the glass and removing it.
Clean the area of all putty.
Install the glass, making sure the glass fits squarley in the whole and evenly spaced on all four sides. You may have to install a temporary shim on the bottom for this.
Install three points per side to hold the glass.
Work and mold the putty into a 1/2" rope size and apply it to the edge until completely covering all four sides.
Take the glazing tool and skim off the excess until the glazing is at a 45 degree angle.
Clean the glass and it is done.
However, your question was how to take the sash out to have someone else fix it. Here is how you do this:
Remove the inside stop on both sides of the window. (The stop is a 1 x 2 or 1 x 1 piece of wood running up the inside of both sides that keeps the window secure).
There is a "trap door" at the bottom of each side that you will see once you are able to pull the window out. This trap door houses two weights (Two on a double hung. One for a single hung). These weights have a rope attached that go up through the frame and out a pully at the top and then down to the window sash itself.
Disconnect the rope from the sash. This is the tricky part. To do this, you must hold on to the rope so it doesn't fly through the pully at the top because it has tension on it due to the weights tied to the other end. (If this happens, Open the trap door and pull the weight and the rope out, disconnect the rope and re-feed it through the pully and re-connect it to the weight).
Tie a small block of wood to the end of the rope you just disconnected so it won't go through the pully.
Do the same for the other side and your sash is out.
Reverse the order to re-install the sash.
Good luck to you!...Show more

A few suggestions.

Remove the glass using leather gloves.

After the putty is removed, you might want to paint the wood with a thin coat of linseed oil to keep the putty from drying out where it contacts the wood.

Allow the putty dry a few days before you paint over it. Use a quality oil-based primer over the putty, and allow a very thin bead of paint to flow up to the glass to form a continuous seal where the glass meets the putty....Show more

kd is right don't remove it! if you have already removed the broken glass and the existing glazing compound (the stuff that makes the bevel holding the window in the sash) just measure the height and width in a few places because the sash may not be square, buy new glass and glazing putty and you've got a new window!...Show more

Don't do that! You would be doing ten times the necessary work! Just measure the EXACT size of the piece of glass you need, get some glazing compound and a putty knife....Show more

could you not just get a glazier to come to you and fix it with the window sash still in it's frame. this would be the best way for you if you cannot get it out it is much harder to put it back in it's frame....Show more