JLG G5-18A Service Manual page 34

General Information and Specifications
3. The assembly process is one of the leading causes for
contamination in air and hydraulic systems.
Contamination can prevent proper tightening of fittings
and adapters from occurring.
a. Avoid using dirty or oily rags when handling fittings.
b. If fittings are disassembled, they should be cleaned
and inspected for damage. Replace fittings as
necessary before reinstalling.
c. Sealing compounds should be applied where
specified; however, care should be taken not to
introduce sealant into the system.
d. Avoid applying sealant to the area of the threads
where the sealant will be forced into the system.
This is generally the first two threads of a fitting.
e. Sealant should only be applied to the male threads.
f. Straight thread fittings do not require sealants.
o-rings or washers are provided for sealing.
g. When replacing or installing an o-ring, care is to be
taken while transferring the o-ring over the threads
as it may become nicked or torn. When replacing an
o-ring on a fitting, the use of a thread protector is
recommended.
h. When installing fittings with o-rings, lubrication
shall be used to prevent scuffing or tearing of the
o-ring. Refer to Section 2.8.17, "O-ring Installation
(Replacement). " , for procedure.
4. Take care to identify the material of parts to apply the
correct torque values.
a. Verify the material designation in the table headings
b. If specifications are given only for steel fittings and
components, the values for alternate materials shall
be as follows:
Aluminum and Brass - Reduce steel values by 35%
Stainless Steel - Use the upper limit for steel.
5. To achieve the specified torque, the torque wrench is to
be held perpendicular to the axis of rotation.
2-22
6. Refer to the appropriate section in this manual for more
MAE9100
specific instructions and procedures for each type of
fitting connection.
G5-18A, 2505