the actuation test, the amount of torque required to
Conduct the static leak test in the same manner as the
operate the valve to any position should not exceed 40
proof test using 5 to 10 psi. Next, apply 3,000 psi to
inch-pounds with 3,000 psi applied to the pressure
both the normal and emergency ports with the
port. The requirements for each test are specified in the
opposing ports plugged. Gradually, apply and check
"Intermediate Repair" section of the MIM.
the torque required to rotate the swivel. Maximum
SWIVEL MAINTENANCE
torque required should not exceed 30 inch-pounds.
Organizational maintenance of the swivel, shown
In the final step of testing, apply low pressure to
in figure 14-25, consists of removal and replacement.
each port with the opposing port unplugged, and check
Intermediate maintenance is limited to replacement of
to ensure that fluid flows freely through the swivel. If
materials provided in the cure-date seal kit and the
the swivel is RFI and is to be returned to supply for
retainer. When you assemble swivels of this type,
stock, flush it with preservative hydraulic fluid and
gently push the outer body over the inner body with a
slight oscillating motion to prevent damage to the
plug all ports. If the part fails the testing, tag it to show
O-rings and backup rings. A light coating of hydraulic
the part of the test failed. Flush with preservative
fluid is applied to all O-rings, backup rings, and mating
hydraulic fluid and plug the ports. Forward the part to
s u r fa c e s b e f o r e i t i s r e a s s e m b l e d . Fo l l ow i n g
supply to be forwarded to the next higher level of
reassembly, the swivel is bench tested.
maintenance.
Proof testing is accomplished by applying 4,500
Q14-25. After a brake reservoir has been cleaned and
psi individually to each port with the opposing port
cure-date parts have been installed, how
plugged. Maintain the pressure for 2 minutes, and
many minutes should the reservoir be
there should be no leakage. Conduct this check a
submerged in a tank of water to check for
minimum of three times, and during the last proof test,
leaks?
rotate the swivel through a complete swiveling circle.
1.
Screw
2.
Washer
3.
Retainer
4.
Outer body
5.
O-ring
6.
Backup ring
7.
Inner body
Figure 14-25.--Brake swivel.
14-26
