This procedure tells you how to do these adjustments:
- drawbar height
- proximity sensor position for the engaged (clamped) drawbar.
If the block moves, go to Step 4. If the block does not move, go to Step 5.
Do this step if the block moved in Step 3.
Do this step if the block did not move in Step 3.
Jog these axes:
- Z Axis to the bottom end of travel
- X Axis to the center of travel
- Y Axis to the front of the machine
You must stand on the mill table to get access to components. Clean the table fully. Put a piece of protective material that does not move on the table.
Remove the front spindle head cover.
ADD OR REMOVE SHIMS
Loosen the (4) screws  for the striker plate. Use the openings in the spindle head casting.
Add or remove the correct number of shims .
Make sure the inner corner  in the shims is fully against the striker plate.
Tighten the striker plate screws .
Do this section again: VMC - 20/30/40-Taper- TRP - Proximity Sensor - Adjustment.
When the drawbar height is correct, tighten the screws again.
- Assemble the pressure gauge service kit.
- Use the pressure kit to adjust the TRP pre-charge.
On some machines, you cannot adjust the regulator. Use the pressure-gauge assembly to make sure the regulator operates correctly. Do these steps to make sure the regulator  operates correctly:Adjustable regulator:
Push and hold the button on the pre-charge solenoid valve . Do this for 20 seconds.Pull the regulator adjustment knob to unlock it. Set the air pressure to 30 psi (2.1 bar). Release the solenoid button. Push and hold the button on the solenoid valve , again. Do this for 20 seconds.
Make sure the gauge shows 30 psi (2.1 bar). Release the solenoid button. Push the regulator adjustment knob to lock it.Non-adjustable regulator:
Push and hold the button on the pre-charge solenoid valve . Do this for 20 seconds.Make sure the gauge shows 30 psi (2.1 bar). If the gauge does not shows 30 psi (2.1 bar), the regulator is defective. Replace the regulator.
Both: Remove the pressure-gauge assembly from the regulator.
Find the nut to adjust the height of the proximity sensor. Use a wrench to turn the nut.
Turn the nut until the light on the sensor goes off. Turn the nut 1/2 of a turn in the same direction.
Make sure that the light on the sensor goes off each time you push the button.
Make sure Draw Bar Open = 0.
Make sure that Draw Bar Open stays 0. If Draw Bar Open does not stay 0, the adjustment is not correct. Do Steps 2 and 3 again.
Push and hold the tool release button.
Make sure that Draw Bar Open changes to 1. If Draw Bar Open does not change to 1, the adjustment is not correct. Do Steps 2 and 3 again.