5. Maintenance
MF0121ACP_uc.docx Manual for Node AM4 Page 53
Note: During maintenance ensure that the unit has been disconnected from mains.
Note: Before disconnecting any cables, label any unlabeled cables to ensure
correct reconnection, and check the switch positions of the removed part to
set the switches of the new part accordingly.
To replace an FRU, use the appropriate tools. The tools are provided along with the
equipment. Replacement tools may be ordered from the supplier.
SMA connectors have a specified torque of 60 N-cm. All screws have a right-hand thread,
turn the tool clockwise for tightening and counter-clockwise for loosening. Use an
appropriate tool to fasten and unfasten connectors and screws. Do NOT overtighten the
connectors or screws!
The tables below show various screws with their respective torques.
Locking Torques for Stainless Steel Screws
Thread Ø Nominal torqu
M 2.0 0.40 N-m
M 2.5 0.82 N-m
M 3.0 1.45 N-m
M 4.0 3.30 N-m
M 5.0 6.50 N-m
M 6.0 11.00 N-m
M 8.0 27.00 N-m
table 5-1 Specified torques for stainless steel screws
Standard Torques for Neck-collar Screws
Thread Ø Nominal torqu
M 3.0 1 N-m
M 4.0 3.3 N-m
M 5.0 6.05 N-m
table 5-2 Standard torques for neck-collar screws
Standard Torques for Metal Cable Glands
Thread Ø Nominal torque to housin
or nut Nominal torque sleeve nut
M 16 x 1.5 20.00 N-m 15.00 N-m
M 20 x 1.5 30.00 N-m 20.00 N-m
PG 7 6.50 N-m 0.42 N-m
table 5-3 Standard torques for metal cable glands
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