MAINTENANCE AND SERVICING
5.2.7 O-Ring F
ace Seal (ORFS) Hydraulic Fittings
To tighten O-ring face seal (ORFS) hydraulic fittings, follow these steps:
1. Check components to ensure that the sealing surfaces
and fitting threads are free of burrs, nicks, and
scratches or any foreig n material.
Figure 5.14: Hydraulic Fitting
2. Apply hydraulic system oil to the O-ring (B).
3. Align the tube or ho se assembly so that the flat face
of the sleeve (A) or (C) comes in full contact with
O-ring (B).
4. Thread tube or hose nut (D) until hand-tight. The nut
should turn freely until it is bottomed out.
5. Torque fi tting further to the torque value in the table
shown in the opposite column.
NOTE:
If applicable, hold the hex on the fitting body (E) to
prevent rotation of fitting body and hose when tightening
the fitting nut (D).
6. When a
ssembling unions or two hoses together, three
wrenc
hes will be required.
7. Check
the final condition of the fitting.
Figure 5.15: Hydraulic Fitting
169890 196 Revision A
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