Installing the Hydraulic Fittings (SAE Straight Thread
O-Ring Fittings) (continued)
IMPORTANT
Before tightening the fitting, determine the material used for the port, the fitting
is to be installed. Installing a fitting into an aluminum port requires reducing
the installation torque.
7. Tighten the fitting lock nut (Step 4, Figure 26):
A. Hold the fitting in the correct alignment with a wrench and use a torque
wrench and tighten the lock nut to the recommended torque value within the
specified range of torque values; refer to the Fitting Installation Torque Table,
page 5–15. This tightening procedure requires a drive-adapter wrench (e.g.,
crowfoot wrench); refer to Calculating the Torque Values When Using a
Drive-Adapter Wrench, page 2–5.
B. If a torque wrench is not available or if space at the port prevents the use of a
torque wrench, hold the fitting in the correct alignment with a wrench and
tighten the lock nut with a second wrench.
C. If the port material is steel, tighten the fitting to the listed Flats From Finger
Tight (FFFT) value; refer to the Flats From Finger Tight (FFFT) Table, page
5–15.
D. If the port material is aluminum, tighten the fitting to 60% of the listed FFFT
value; refer to the Flats From Finger Tight (FFFT) Table, page 5–15.
Hydraulic System: Hydraulic Hoses Page 5–14 4520P
09.40003Rev 00
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