Organizational maintenance of the swivel, shown in figure 12-46, consists of removal and replacement. Intermediate maintenance is limited to replacement of materials provided in the cure-date seal kit and the retainer. When you assemble swivels of this type, gently push the outer body over the inner body with a slight oscillating motion to prevent damage to the O-rings and backup rings. A light coating of hydraulic fluid is applied to all O-rings, backup rings, and mating surfaces before it is reassembled. Following reassembly, the swivel is bench tested.

Figure 1247.-Brake self-adjustment feature-single disc brake.

Proof testing is accomplished by applying 4,500 psi individualy to each port with the opposing port plugged. Maintain the pressure for 2 minutes, and there should be no leakage. Conduct this check a minimum of three times, and during the last proof test, rotate the swivel through a complete swiveling circle. Conduct the static leak test in the same manner as the proof test using 5 to 10 psi. Next, apply 3,000 psi to both the normal and emergency ports with the opposing ports plugged. Gradually, apply and check the torque required to rotate the swivel. Maximum torque required should not exceed 30 inch-pounds.

In the final step of testing, apply low pressure to each port with the opposing port unplugged, and check to ensure that fluid flows freely through the swivel. If the swivel is RFI and is to be returned to supply for stock, flush it with preservative hydraulic fluid and plug all ports. If the part fails the testing, tag it to show the part of the test failed. Flush with preservative hydraulic fluid and plug the ports. Forward the part to supply to be forwarded to the next higher level of maintenance.