This procedure should be referenced when replacing a Main Turret Shaft.

Clean and re-grease inside of gearbox where main shaft sits.

Install new main shaft and screw down.

Clean, re-grease (if needed) and reinstall the following items in order: 

1. The turret onto the main shaft
2. Spur gear
3. Cluster gear, three washers, and spring
4. Worm gear, motor mount, and coupler 

Clean and reinstall the following items:

1.  Turret servo motor
2.  Bearings
3.  Locknut, torque down at 100 ft-lbs

Remove the turret and loosen all but two of the bolts holding the main shaft in place.

Remove the turret and loosen all bolts holding the main shaft in place. Tighten down two bolts across from each other. 

Use a dial indicator and sweep the housing OD to check the runout of the shaft. Adjust the shaft, using a pry bar, until the indicator reads ......... or less.  Tighten then torque all bolts to Haas specification. 

Reinstall the turret.

Reinstall the rear cover with new gasket, torque bolts down at 25 ft-lbs.

Slide the live tooling drive into the turret and torque bolts in a star pattern.

Install the indicator base on the live tool drive?

Install the snap ring [2] on the torque tube.

Install the torque arm springs [1].

Refill the liquid grease through the top fitting on rear cover [1]. 

• If machine is equipped with the live tooling, fill the turret gearbox with 2 quarts of Haas Liquid Grease.
• If machine is not equipped with the live tooling, fill the turret gearbox with 3 quarts of the Haas Liquid Grease.

Install and enable the live tool and turret servo motors if equipped.

Install new???? fitting into cover.

Install the following items in this order:

1. Install the key from the torque tube.
2. Install a 3/8-16 bolt [2] in the jack screw hole next to the clamp bolt. Apply just enough torque to spread the torque arm so it can slide on the torque tube.
3. Install the clamp screw.
4. Install the live drive motor mount.
5. Install the live drive motor.
6. The turret front cover and live drive alignment bracket.

Follow  the Turret Tool Changer Alignment and Live Tool Drive Alignment in the BMT45 Turret - Live Tool Drive - Alignment document.