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2.5 Removing And Replacing A Castor Wheel Assembly
General
1
Check the castor wheel assembly for any defects (refer to paragraph 4). If any defects are observed then
refer to paragraphs 5 to 8 for maintenance details and to Chapter 3 for parts information.
2
It is not intended that any other part is maintainable.
Tools
3
Refer to the tool list at the beginning of this Chapter.
Inspection
4
Check the following:
4.1
Castor fork is undamaged.
4.2
Tyre is not cracked or excessively worn.
4.3
Castor wheel rotates freely when lifted clear of the ground and spun.
4.4
The tyre is firmly fitted and concentric within the rim.
Removing A Castor Wheel Assembly
5
To remove the castor wheel assembly proceed as follows:
5.1
Raise and support the front of the chair.
5.2
Using a torque wrench unscrew the castor wheel until the castor assembly releases from its
location.
5.3
Remove the castor wheel assembly.
5.4
Check that the castor wheel location is undamaged and clean.
Replacing A Castor Wheel Assembly
CAUTION:
6
Replacing the castor wheel assembly is the reverse of the removal; ensure the following:
6.1
It is firmly located and secure.
6.2
Free to rotate through 360 degrees.
6.3
Is undamaged.
7
Once correctly fitted, remove the support and allow the chair to sit on all four wheels. Check that it
functions correctly.
02/02
Apply Loctite 242 to the thread of the castor wheel shaft and ensure that the
castor wheel is tightened using the fork nut to a torque of 30 lbf.ft.
MAINTENANCE
Page 2.23
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