Inspect the top of the transfer tube for any debris or damage.
Apply Red-I grease to the rubber seal and the bore on the bottom of the coolant union .
Install the compensating coolant union over the transfer tube with the fittings pointed to the right.
Tighten the four mounting bolts  and back them off 1/4 turn.
While rotating the spindle by hand, gradually tighten and then torque the mounting bolts in the criss-cross pattern.
Note: Refer to the Haas Fastener Torque Specifications for the correct torque value.
Insert a screw driver  into the top JIC fitting  until you feel it contact the piston .
Note: The top cover has been removed in this image to illustrate the piston. Do not disassemble the coolant union.
Lightly press downwards until you feel the piston  contact the shaft  to eliminate the gap .
Reattach the hoses to the coolant union.
Run the spindle motor at 100 RPM and verify the union is not rubbing on the shaft. Gradually increase the spindle speed from 100 to the max RPM and check the coolant union for abnormal noise and vibration.