Zero return the machine to allow for plenty of access to the spindle head
Power off and lock out the machine
Remove the coolant collector box, rear, and front panel to gain access to the spindle head
Remove the anti-rotation bracket that seats around hydraulic union drain hose
Lock the spindle to prevent it from rotating
Break the screws  loose that connect the adapter to the union
Disconnect the hydraulic lines  from the hydraulic union . Note the clamp/unclamp hose and port orientation
Note: Have plugs or baggies and rubber bands to cover the hoses to prevent hydraulic fluid from coming out and debris from getting in. Keep the hoses pointed up and tucked away on the side of the spindle to prevent fluid from coming out
Remove the screws and slowly remove the union and drawtube assembly
Caution: The union is heavy and if dropped it could receive permanent damage
Have a box or table nearby with padding to lay the union in and support the drawtube
Remove the adapter screws  that secure the adapter  to the spindle shaft.
Then break the screws loose but leave them snug while the adapter cools
Torque screws again once the adapter has cooled
Once cooled measure the inner radial runout , not to exceed 0.001"
Measure the axial runout , not to exceed 0.0005"
Production Tip: If you find that you're having a hard time getting the adapter to seat and have accepatable runout, then try the following. After you slip the hot adapter on the shaft, snug all the screws down, and then lightly indicate the adapter on the inner radius  while using a plastic mallet on the outer diameter. When the runout is within spec, slowly torque all of the screws down in a star pattern being careful not to induce runout.
Install hydraulic union:
A limited number of ST-10's have a sweat fit from the adapter to the union. If you have this condition you can heat the adapter with a torch for about 3-5 minutes until the bore grows enough to allow the hydraulic union to slip in.
All other lathes - install the union and snug the screws
Indicate in the steel strip  NTE 0.0005" TIR
Check the deflection measurement  by placing the indicater on the non-rotating body of the union and then rotate the pulley. The deflection should be less than 0.001".
Re-attach the clamp/un-clamp hoses and the drain hose
Warning: Do not over tighten or you could crack the alumnium assembly
Verify Spindle Lubrication - Bottle Test
After replacing the spindle you will want to make sure it gets adequate oil.
Some lathes have balancing holes for set screws on the adapter plate or the pulley face
Use these holes to reduce unecessary vibration only after verifying all components meet specified runouts
If the spindle passes, re-install enclosure, and the procedure is complete
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