sitrex BR 2030/6, Assembly Instructions Manual

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5
1.6 TORQUE SPECIFICATIONS
– STANDARD TORQUE DATA FOR HYDRAULICS
General information
Hydraulic connections require a minimum assembly torque in order to provide zero leakage at rated pres-
sure with adequate fatigue resistance. Over-torqueing of a hydraulic connection can also lead to leakage or
failure. For some connections, CNH Industrial requires a different torque value than is listed in the ISO and
SAE standards.
Always follow the instructions in this manual for specific torque values when you service components.
The information in this section is for general guidance only when a procedure contains no specific torque
value.
Tolerance
The tolerance for all torque values is ± 10%. This tolerance must include all assembly variation, not only the
torque wrench repeatability.
Lubrication
Application of grease or other lubricants to hydraulic connectors should be avoided. If clean hydraulic oil is
already on the connection, it is not required to remove the oil. Generally, application of grease:
• May cause a significant change in the torque required to properly tighten the connection.
• May reduce the connection’s resistance to vibration.
• Excessive grease may displace an elastomer seal during tightening.
• Grease extrusion when connection is tightened may be mistaken for leakage.
The lubrication is recommended only for connections which are made into aluminum manifolds or with
stainless steel connectors, it may be required to apply a lubricant to prevent galling.
Use of thread-locking compounds is prohibited because:
• May cause a significant change in the torque required to properly tighten the connections.
• Reduce the serviceability of the joint.
• May prevent the O-ring from properly sealing if the compound gets on the O-ring.