Ffwr And Tfft Methods; Adjustable Stud End Assembly; O-Ring Installation (Replacement) - JLG G5-18A Service Manual

General Information and Specifications
2.8.15

FFWR and TFFT Methods

1. FFWR (Flats from Wrench Resistance Method)
a. Tighten the swivel nut to the mating fitting until no
lateral movement of the swivel nut can be detected;
finger tight condition.
b. Mark a dot on one of the swivel hex nut flats and
another dot in line on the connecting tube adapter.
c. Use the double wrench method per Appendix A,
turn the swivel nut to tighten. The nut is to be
rotated clockwise the number of hex flats.
d. After the connection has been properly tightened,
mark a straight line across the connecting parts, not
covering the dots, to indicate the connection has
been properly tightened.
FFWR Method
2. TFFT (Turns from Finger Tight Method)
a. Tighten the swivel nut to the mating fitting until no
lateral movement of the swivel nut can be detected;
finger tight condition.
b. Mark a dot on one of the swivel hex nut flats and
another dot in line on the connecting tube adapter.
c. Use the double wrench method per Appendix A,
turn the swivel nut to tighten. The nut is to be
rotated clockwise the number of turns.
d. After the connection has been properly tightened,
mark a straight line across the connecting parts, not
covering the dots, to indicate the connection has
been properly tightened.
2-68
2.8.16
For Adjustable Stud End Connections; the following
assembly steps are to be performed:
a. Lubricate the o-ring with a light coat of hydraulic oil.
b. Position #1 – The o-ring should be located in the
groove adjacent to the face of the back-up washer.
The washer and o-ring should be positioned at the
extreme top end of the groove as shown.
c. Position #2 – Position the locknut to just touch the
back-up washer as shown. The locknut in this
position will eliminate potential back up washer.
2.8.17
Care must be taken when installing o-rings over threads dur-
ing replacement or installation. o-rings could become
nicked or torn. A damaged o-ring could lead to leakage
problems.
1. Inspect o-ring for tears or nicks. If any are found replace
o-ring.
2. Ensure proper o-ring to be installed. Many o-rings look
the same but are of different material, different
hardness, or are slightly different diameters or widths.
MAE9500
3. Use a thread protector when replacing o-rings on
fittings.
4. In ORB; ensure o-ring is properly seated in groove. On
straight threads, ensure o-ring is seated all the way past
the threads prior to installation.
5. Inspect o-ring for any visible nicks or tears. Replace if
found.

Adjustable Stud End Assembly

O-ring Installation (Replacement)

G5-18A, 2505