Support
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With an allen key continue to gradually and equally tighten the grub screws , making sure that the taper bush remains in the intended position , alternate between the two ( or three ) screws , making sure to never get any one too far ahead .
Note that the grub screws may be imperial ; you will need to use an imperial allen key .
Using a nylon hammer , tap on the larger end of the bush . This will ensure concentric seating by the bush . After doing this , further tighten the screws . ( You will find that they are now able to move more ). Repeat the tapping and tightening , until there is no more movement to be found on the screws .
You can torque the grub screws to the manufacturer ’ s published values given for the tightening of the grub screws . The tables , carrying this information , are available in the manufacturer ’ s literature . Allow the drive to run under load for a short time . Then stop the system and recheck the tightness of the grub screws . Once complete you can apply a small amount of grease to the grub screw heads .
Do not grease or apply other coatings to the bush or the shaft at the bush in order to prevent rusting . There will be no rusting of the surfaces where metal to metal contact is being made . Andre , let us move on to the removal of the taper bush .
REMOVAL To remove a taper bush , first loosen off all the grub screws . Apply commercial penetrating oil if rusting has taken place , after first having cleaned the shaft end where the bush will be required to slide .
Oil the threads . Fit one or two of these screws ( according to the design of the taper bush ) in the jacking out-hole or holes .
Tighten the screw ( s ) – in the case of two screws alternately – continuing until the hub and assembly draw free on the shaft . You can now remove the taper bush with ease and without damage .
Thank you for the question Andre , I hope that this helps with your work with taper bushes .
REFERENCES :
1 . ACRA 2 . SANS 10147 3 . Fenner
Thank you for all your questions . Send your problems ( and sometimes your creative solutions ) to acra @ netactive . co . za with ‘ Solutions Page ’ in the subject line . You may include pictures . RACA
www . refrigerationandaircon . co . za RACA Journal I October 2022 49