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Installation and removal

KMD precision lock nuts have slots around their circumference to accommodate a hook or impact spanner (fig. 1). The designations of the appropriate spanners are listed in the product table. For additional information about spanners, refer to the catalogue SKF Maintenance and Lubrication Products or visit Maintenance products.
KMD precision lock nuts are designed for frequent installation and removal (provided they are not damaged).
KMD lock nuts are supplied with a protector between the front and rear part of the lock nut. The axial locking screws are “finger tight” to keep the protector in place. To install the lock nut (fig 2):
  1. Loosen the locking screws (1) half a turn. Do not remove them.
  2. Remove the protector (2) between the two parts of the lock nut.
  3. Hold the front and rear parts together and screw the lock nut onto the shaft. When the rear part grabs onto the shaft thread, a gap occurs between the two parts of approximately:
    • 0,6 mm for KMD 4 lock nuts
    • 1,0 mm for KMD 5 to KMD 15 lock nuts
    • 1,2 mm for KMD 16 to KMD 21 lock nuts
The remaining steps depend on whether adjustment to an exact position on the shaft is required.

When precise positioning is not required
  1. Screw the lock nut to its final position on the shaft thread, engaging the spanner in the slots on the front part of the nut.
  2. Tighten the locking screws alternately in a criss-cross pattern until the recommended torque value is obtained (→ product table). Screw sizes sizes are listed in the product tables.
When precise positioning is required
  1. Screw the lock nut to an approximate position on the shaft thread, engaging the spanner in the slots on the front part of the nut.
  2. Tighten the locking screws alternately in a criss-cross pattern to half the recommended torque value (→ product table). Screw sizes are listed in the product tables.
  3. Adjust the nut to its final position on the shaft (placing the spanner in the slots on the front part of the nut).
  4. Tighten the locking screws alternately in a criss-cross pattern to the full recommended torque.
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