Hydraulic Pump Drive - Rebuild (9-04) Section 9 - Drive Units M11 Page 9-14 Hydraulic Pump Drive - Rebuild (9-04) Disassembly Remove the shaft and gear assembly from the rear adapter. Use needle bearing kit, Part No. 3823774, to remove the needle bearing from the hydraulic pump adapter. Install the shaft and gear assembly in an arbor press with the part number side of the gear facing down. Caution: Do not allow the shaft to fall when removing it from the gear. Personal injury or damage to the shaft can result. Press the shaft from the gear. Cleaning Clean the parts with solvent, dry with compressed air.