I have removed top-loader actions often!

1. disconnect hose to the air motor;
2. label each small hose on each end that go to the expression
   mechanism.  They usually go in order, but can easily be mixed up
   when replacing them.  The order usually is:
     bass end: 1-B 2-B 3B 3T 4-B 6-B 7-B and a supply tube
     treble end: 1-T 2-T 4-T 5-T 6-T 7-T & motor shut off;
3. disconnect the tempo cable, being careful not to drop the small
   machine screw into the piano action;
4. remove wood screw in each end of the top frame;
5. disconnect each hose from each unit valve.  They are connected to
   a spreader and can be traced in a row.
6. disconnect each 3/16" hose (treble and bass) that attach to the
   stack near the 1-1/8"  hose.  These go to the amplifier pneumatic.

Once all hoses are disconnected, the frame lifts up and out, leaving
the pneumatic stack in place.  This is removed by gently sliding to
the front, and slowly working it off the two 1-1/8" hoses at each end
of the stack.  Be very careful, because the pneumatic lifter tips are
very fragile, and there is not much clearance to get them out; but the
action will come out.

If there is difficulty, the two expression systems under the keybed
will have to be removed and the large hoses pulled downward off the
stack.

When it is re-assembled, it is a good idea to test each hose from the
source, to be certain they are connected properly.  This is done by
disconnecting hose 1-B at the crescendo mechanism, and blowing into it.
Air should come out hole #1-B in the tracker bar.  Check each one in
the same way.

In addition, if your top loader does not have finger buttons for manual
expression, it is wise to disable the finger button valve on the
expression system that is not used.  The reason for this is they are
subject to leaking, and can cause numerous problems.

For tuning, I find it easiest to simply remove the air motor hose,
slide the frame forward about 10 inches, and hold it in place, using
two C-clamps.

Bruce Clark