GENERAL HYDRAULIC SYSTEM REPAIR METHODS - Continued
RELIEVING HYDRAULIC PRESSURE - Continued
Packing must be seated fully into groove and not on threads. Failure to comply may damage
packing, resulting in damage to equipment.
O-ring (preformed packing) Boss. This termination also has a straight thread. The seal for this termination is
a performed packing that fits at the top of the threads on the male fitting. This packing is squeezed into the
extra space at the top of the threads of the female fitting and seals the connection (Figure 3). The installed
packing must be free of nicks and cuts to seal properly. If packing is nicked or cut, it must be replaced.
O-RING (PACKING) CAVITY
Figure 3. O-ring (Preformed Packing) Boss.
Flareless. This fitting also uses a straight thread. The female fitting contains a ferrule that mates with a cavity
in the male fitting (Figure 4). Use recommended torque values to tighten nut, see guide at end of work package.
If this fitting is over torqued, the ferrule will be deformed and the fitting will leak.