Kmt Nut Fitting And Removal - Hamilton Jet HJ212 Installation And Service Manual

Appendix

KMT Nut Fitting and Removal

Technical Data
Material
Finish
Locking screws
Locking pins
Thread tolerance
Recommended shaft thread
tolerance
General
The KMT nut is quite simple to fit, as each nut is provided with 4 cut-outs and 2 spanner flats on its outer
surface. The KMT nut also has a number of radial and axial holes which can be used for tightening the nut.
A hook or impact spanner is recommended for the fitting and removal of the nut but open ended or
adjustable spanners may be used.
The KMT nut is locked in position by means of the 3 locking screws, tightened to the recommended torque,
using a socket / allen key or a torque wrench.
Fitting the KMT nut
Prior to fitting the KMT nut, ensure that the locking screws are partially withdrawn and that the locking pins
are not protruding into the thread path of the KMT nut.
Fit the nut to the shaft and torque load to the recommended torque.
Screw down the locking screws evenly so that the brass locking pins contact the screw threads of the shaft.
Torque load the locking screws evenly to the recommended torque.
Do not over tighten.
KMT bearing M6 locknut screws - 5Nm (4ft/lbs).
Removing the KMT nut
Loosen the three locking screws located around the circumference of the bearing retaining nut
Brass locking pins are fitted under the locking screws and are forced into the the mainshaft threads when

the locking screws are tightened.
To release the locking pins, firmly tap in the vicinity of the locking screws, with a soft headed hammer

If the retaining nut is shrouded by the bearing housing, place one end of a bar in the vicinity of the locking
screw and lightly strike the opposite end until the locking pins release. If this fails, tighten the retaining nut
slightly to remove any residual torque and tap the nut again using slightly heavier blows.
High strength steel
Phosphated and saturated with
oil
P6SS ISO/913, Grade 12.9
Hard drawn brass
5H ISO 965/3
6g
10-12
Installation and Service Manual