
Figure 9-5.  Upper Block Assembly.
“B” Frame: Upper Block Components for Figure 9-5. 
Ref.  | Part | 
  | Qty. | 
No.  | Number | Description | Req’d | 
  | “B” Frame Hoist Upper Block Assembly (Includes Ref. Nos.   | 1  | |
1  | Upper Block Yoke  | 1  | |
2  | Key Plate  | 1  | |
3  | Hex Head Bolt   | 2  | |
4  | Sheave Pin  | 1  | |
5  | Lockwasher (3/8)  | 4  | |
6  | Hex Head Bolt, Grade 5   | 2  | |
7  | Spacer Washer  | 2  | |
8  | Sheave  | 1  | |
9  | Ball Bearing  | 1  | |
10  | Internal Retaining Ring  | 1  | |
11  | Spacer Washer  | 6  | |
12  | 2  | ||
13  | Yoke Pin  | 1  | |
14  | Cotter Pin  | 2  | |
15  | Flanged Bushing  | 1  | 
“C” Frame: Upper Block Components for Figure 
Ref.  | Part  | 
  | Qty.  | 
No.  | Number  | Description  | Req’d  | 
  | “C” Frame Hoist Upper Block Assembly (Includes Ref. Nos.   | 1  | |
1  | Upper Block Yoke  | 1  | |
2  | Key Plate  | 1  | |
3  | Socket Head Cap Screw   | 2  | |
4  | Sheave Pin  | 1  | |
5  | Lockwasher (3/8)  | 4  | |
6  | Socket Head Cap Screw   | 2  | |
7  | Spacer Washer  | 2  | |
8  | Sheave  | 1  | |
9  | Ball Bearing  | 1  | 
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