Specifications

Maintenance
04T,90,K175 –19–01AUG94–1/1
SERVICE RECOMMENDATIONS FOR METRIC SERIES FOUR BOLT FLANGE FITTING
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 the correct 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 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 must be centrally located on port. Hand
tighten cap screws to hold flange in place. Do
not pinch O-ring.
5. 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 chart
below.
DO NOT use air wrenches. DO NOT tighten one
cap screw fully before tightening the others. DO
NOT over tighten.
TORQUE CHART*
Thread** N•m lb-ft
M6 12 9
M8 30 22
M10 57 42
M12 95 70
M14 157 116
M16 217 160
M18 334 246
M20 421 318
*Tolerance ± 10%. The torques given are enough
for the given size connection with the
recommended working pressure. Increasing cap
screw torque beyond these amounts will result in
flange and cap screw bending and connection
failures.
**Metric standard thread.
90–40
PN=206