SERVICE RECOMMENDATIONS FOR METRIC SERIES FOUR BOLT FLANGE FITTING
D--Single Piece Flange
DO NOT use air wrenches. DO NOT tighten one
1. Clean sealing surfaces (A). Inspect. Scratches
cap screw fully before tightening the others. DO
cause leaks. Roughness causes seal wear.
NOT over tighten.
Out-of-flat causes seal extrusion. If defects cannot
be polished out, replace component.
2. Install the correct O-ring (and back-up washer if
required) into groove using petroleum jelly to hold it
3. Split flange: Loosely assemble split flange (B)
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 (C).
4. Single piece flange (D): Place hydraulic line in
center of flange and install four cap screws. Flange
Tolerance ± 10%. The torques given are enough for the given
must be centrally located on port. Hand tighten cap
size connection with the recommended working pressure.
screws to hold flange in place. Do not pinch O-ring.
Increasing cap screw torque beyond these amounts will result in
flange and cap screw bending and connection failures.
5. After components are properly positioned and cap
Metric standard thread.
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 chart below.