In several respects, you will maintain a winch or a capstan in the same way you maintain a windlass. Inspect the friction brake linings regularly and replace them when necessary. Take steps to prevent oil or grease from accumulating on the brake surfaces. Periodically check the operation of brake-actuating mechanisms, latches, and pawls.

Frequently inspect winch drums driven by friction clutches for deterioration of the friction

Figure 18-4.-Electric winch.

material. Check also to see if oil and grease on the surface is causing improper operation. Lubricate the sliding parts of positive clutches properly. Check the locking device on the shifting gear to see if it will hold under the rated load.

Shipboard Cranes Cranes used on board United States Navy ships are classified by the functional use of the crane. The following crane designations are in common use:

1. Boat and aircraft (B&A)

2. Boat and repair (B&R)

3. Boat and missile (B&M)

4. Boat and helicopter (B&H)

5. Cargo stores

Figure 18-5.-Topping (king post) crane.

Figure 18-6.-Nontopping (pillar) crane.

6. Sail-service

7. Minesweeping

8. Salvage

9. Torpedo