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BAC Parts
Parts Reference Materials

Aluminum and Cast Iron Sheave Bushing Installation Instructions

Read complete instructions before proceeding:

  1. Wipe the shaft, bushing bore, bushing taper, and aluminum sheave bore with a cleaning solvent to remove any dirt or oil
  2. Tighten each bolt a little at a time so that the bushing draws evenly into the sheave hub without cocking to one side or the other. Torque the bolts as specified on the chart below. Rotate the sheave to verify that it does not wobble.
  3. Do not attempt to bottom-out the bushing in the aluminum sheave. After proper bolt torque is applied, there should still be a gap between the bushing flange and the sheave hub.

BAC Caution Tip

Failure to follow these instructions may result in a cracked sheave! Do not use “Never Seize” or any  lubricants on the bolts!

Aluminum Sheave Size Bushing Type Bolt Torque (FT-LBS)
2B3.6 thru 2B4.4 SH 6
2B4.6 thru 2B6.8 SDS 6
2B7.0, 2B16.0 SK 13
2B20.0 SF 22
4B4.2 thru 4B6.6 SD 6
4B6.8 thru 4B9.4 SK 13
4B16.0, 4B20.0 SF 19
4B25.0, 5B25.0 E 35
6B5.0 thru 6B5.4 SD 6
6B5.6 thru 6B6.8 SK 13
6B7.0, 6B7.4, 6B9.4 SF 22
6B30.0, 6B38.0 E 35
8B5.6 SK 13
8B7.4 thru 8B8.2 SF 22
8B8.8 thru 8B9.4 E 35
8B38.0, 8B50.0 F 55
Cast Iron Sheave Size Bushing Type Bolt Torque (FT-LBS)
3B38, 4B25 to 4B38, 5B20to 5B38, 6B20 to 6B38 E 60
2B25 to 2B38,3B20 to 3B30, 4B15.4 to 4B20, 5B7.0 to 5B18.4, 6B7.0 to 6B18.4 SF 30
3B4.6 to 3B6.8, 4B3.4 to 4B6.8, 5B3.4 to 5B5.2, 6B3.4 to 6B5.2 SD 9
1B3.4 to 1B4.4, 2B3.4 to 2B4.4 , 3B3.4 to 3B4.4 SH 9
1B4.6 to 1B13.6, 2B4.6 to 2B6.8 SDS 9
1B15.4 to 1B20, 2B7.0 to 2B18.4, 3B7.0 to 3B18.4 4B7.0 to 4B13.6, 5B5.4 to 5B6.8, 6B5.4 to 6B6.8 SK 15