Fairlead Restriction Brake

14. Attach a crane and rigging to the and slide the sheave from the pin. Remove the spacer from the pin.

15. Remove the labyrinth seal capscrews and remove the labyrinth seals, oil seals and spacers from the sheave. Remove the bearings from the sheave.

16. Repeat steps 13, 14 and 15 to remove the sheave on the other side of the bracket.

17. Install cribbing in front of the bracket of sufficient height so that when the bracket is lowered it will be approximately level. Also crib under thetensile arm to supportitwhenit is unpinned from the bracket.

18. Attach a crane and rigging to the fairlead bracket and remove the tensile arm to bracket pin. Lower.the bracket onto the cribbing. 19. Disconnect the crane from the bracket and connect it to the tensile arm. Remove the pin securing the arm to the revolving frame and remove the arm.

20. Reconnect the crane to the fairlead bracket and remove the bracket to revolving frame pin. Note the amount of shims removed so that the same amount ofshims will be installed at reassembly. Remove the bushings from thebracket.

21. Inspect all parts and repair or replace all worn or damaged parts.

22. Reassemble in reverse of disassembly noting the following:

a. Be sure seal lips face in correct direction. b. When installing swivel frame sheave pin, be sure end with lube hole is facing outside of swivel frame.

When installing bracket to revolving frame pin, be sure lube holes closest to end of pin are on the top.

d. When installing sheave pins, lube holes should be to the front side of the pin.

Fairlead Restriction Brake

The brake is a self-contained unit used to restrict the movement of the fairlead swivel frame.

Frequently check the air line connections for air leaks. Tighten loose connections. Periodically check the brake disc wear throucrh the onenincrs in'" .

the outer drive ring. The wear can be measured by inserting a rule in the slotted openings in the top of the cylinder. Measure the distance when the brake is released and when it is set. When the difference between the two measurements equals 7/16 inch, the discs must be replaced.

BRAKE DISCS

To replace the discs:

1. Disconnect the air line to the brake. Remove the air cylinder and piston as a unit by removing the nuts from the cylinder studs, and sliding the cylinder and piston from the brake drive ring (figure 78).

2. Remove the outer plate, discs and center plate from the drive ring. The separating springs and push studs will come out with the center plate.

3. Check the disc facings for wear. If the facing thickness is approximately half the thickness of a new facing, reline or replace the discs.

4. Inspect the brake plate faces for nicks, scratches, gouges or other surface defects which will cause unusual or rapid disc facing wear. Replace damaged plates.

5. Check the brake springs for weakness and defects. Replace weak or faulty springs.

6. Install the discs and center plate in the drive ring. Make sure the center plate and spring assemblies are installed with the small ends of the spring studs properly entering the bores in the outer plate. Also make sure the springs locate in the counterbored holes provided for them in the center plate and the drive rings. 7. Thoroughly clean the cylinder O-ring surface with an approved solvent to remove any contaminant that could damage the piston ring,

O-ring or the cylinder bore. Install the cylinder and piston as a unit. Secure the cylinder with the stud nuts, making sure all nuts are snug and equally torqued to distribute the total load evenly to each stud.

8. Connect the air line to the brake.

PISTON RINGS

Ifthe piston O-ring is cut or damaged from lack of lubrication or entry of dirt, the O-ring must be replaced as follows:

1. Disconnect the air line to the brake.