GENERAL TORQUE VALUES - Continued
Metric Series Four Bolt Flange Fitting Service Recommendations
Clean sealing surfaces (Figure 21, Item 1). Inspect. Scratches cause leaks. Roughness causes seal wear.
Out-of-flat causes seal extrusion. If defects cannot be polished out, replace component.
Install O-ring (and backup washer if required) into groove using clean oil to hold it in place. Refer to LO
Split flange: Loosely assemble split flange (Figure 21, Item 2) halves. Make sure split is centrally located and
perpendicular to the port. Hand tighten cap screws to hold parts in place. Do not pinch O-ring (Figure[Undefined
Entity: nbsp]21,[Undefined Entity: nbsp]Item[Undefined Entity: nbsp]3).
Single piece flange (Figure 21, Item 4): Place hydraulic line in center of flange and install four cap screws.
Flange must be centrally located on port. Hand tighten cap screws to hold flange in place. Do not pinch O-ring.
After components are properly positioned and cap screws are hand tightened, tighten one cap screw, then
tighten the diagonally opposite cap screw. Tighten two remaining cap screws. Tighten all cap screws as
specified in the table.
Figure 21. Metric Series Four Bolt Flange Fitting.