Specifications

Maintenance
04T,90,K174 –19–01AUG94–1/2
SERVICE RECOMMENDATIONS FOR INCH SERIES FOUR BOLT FLANGE FITTINGS
T6890BB –UN–01MAR90
A—Sealing Surface B—Split Flange C—Pinched O-Ring D—Single Piece Flange
1. Clean sealing surfaces (A). Inspect. Scratches
cause leaks. Roughness causes seal wear.
Out-of-flat causes seal extrusion. If defects
cannot be polished out, replace component.
2. Install O-ring (and backup washer if required)
into groove using petroleum jelly to hold it in
place.
3. Split flange: Loosely assemble split flange (B)
halves. Make sure split is centrally located and
perpendicular to 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 cap screws. Flange
must be centrally located on port. Hand tighten
cap screws to hold flange in place. Do not pinch
O-ring.
5. 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.
DO NOT use air wrenches. DO NOT tighten one
cap screw fully before tightening the others. DO
NOT over tighten.
90–41
PN=207