T-SM47j P25/54
T20-a
OPERATION TABLE
vi Compress or extend the damper length manually to
enable the damper angle bracket to be secured back
onto the base plate using threadlock (part number
670650) on the screw threads.
vii Reassemble table by reversing the above, replace
covers as section 6.2.2.2 and check table base function.
6.3.4 Front wheels
To replace a front wheel in the event of wear or damage,
refer to Fig. 6.2 and proceed as follows:
i Ensure both pedals are in the raised position.
ii Remove the appropriate base cover as detailed in
section 6.2.2.1. Replace the castor pedal (see note
in 6.2.2.2 iv) and raise the table onto its castors at
the short trunk end.
iii Remove the screw from the wheel (its axle) and
remove the wheel.
iv Replace the wheel with a new one and replace the
screw using threadlock (part number 670650) on
the screw thread. Tighten the screw until the wheel
tread guards have been clamped reducing any
lateral play to a minimum.
v Remove castor pedal, replace covers as 6.2.2.2,
reattach castor pedal (see note in 6.2.2.2 iv) and
check table base function.
6.3.5 Castors
6.3.5.1 Castor assembly
To replace a castor assembly in the event of wear or
damage, refer to Fig. 6.2a or 6.2b as appropriate and
proceed as follows noting that the procedure is similar for
all castors. If replacing the wheels only refer to 6.3.5.2:
i Ensure both pedals are in the raised position.
ii Remove the appropriate base cover as detailed in
section 6.2.2.1.
iii Remove the appropriate damper angle bracket and
at the leg end remove the two fixing screws in each
of the two outer pedal anchor blocks. In the case of
the head end remove the two fixing screws in the
outer pedal anchor block only.
iv If required remove the connection from the static
discharge resistor assembly where it joins the table
base and/or the earth lead connection.
v Slide the pedal spindle and lifting wheel assembly
away from the remaining pedal anchor block and
clear of the table base.
vi Lift the castor plate assembly up and off of the castor
pillars. Remove the faulty castor from the castor
plate (four screws). Note position of the isolating
bushes, special washers and insulation pad.
vii Replace the new castor by reversing the above
ensuring that the following points are observed:
a) Correct positioning of all components and refer
to note on Fig. 6.2b.
b) Use threadlock (part number 670650) on all
threads and tighten castor screws to 4Nm. Do
not overtighten as this can compromise the
insulation properties of the insulation pad.
c) Reapply grease (part number 110477) to castor
pillars, bearings and pins.
d) Reconnect the static discharge assembly to the
base plate and earth lead (if removed).
e) Check function of pedal latching mechanisms.
viii Check for a nominal resistance of 6.6MΩ between
a table side rail and the surface of the castor wheel
to which the resistor assembly (item 22 of Fig. 6.2)
is connected, to ensure that the static path has not
been compromised (or >100MΩ on other castors).
ix Reassemble table, replace covers as section 6.2.2.2
and check all base functions for correct operation.
6.3.5.2 Castor wheels
If replacing the castor wheels only proceed as follows:
i To replace the leg end wheels, raise both base
pedals, remove the leg end base cover as detailed
in section 6.2.2.1 and then change the leg end
wheels as below in parts ‘iii-v’.
ii If required (i.e. changing the head end wheels) refer
to 6.3.5.1 follow parts ‘ii-vi’ and remove the head
end castor plate assembly, then replace the head
end wheels as below in parts ‘iii-v’.
iii Remove the nut from the wheel spindle and replace
the wheels as a pair (part number 110900, 2 per
castor). If replacing the washers as well use 3
washers part number 710704 only. Use threadlock
(part number 670650) on nut thread.
iv Reassemble the table by reversing the above
ensuring that the following points are observed:
a) Correct positioning of all components.
b) Use threadlock (part number 670650) on all threads.
c) Reapply grease (part number 110477) to castor
pillars, bearings and pins (if removed).
v Reassemble table, replace covers as section 6.2.2.2
and check all base functions for correct operation.
6.3.6 Brake pads
To change the brake pads when worn or hard and
becoming brittle, refer to Fig. 6.2a or 6.2b as applicable
and proceed as follows:
i Remove the head end base cover as detailed in
section 6.2.2.2 and then replace the wheel foot pedal
(see note in 6.2.2.2 iv).
ii Raise the table at the head end onto its castors
(wheel orientation).
iii Always change both brake pads and use threadlock
(part number 670650) on screw. If applicable ensure
the spacer is replaced (SN T2AC or later only).
iv Remove wheel foot pedal, replace covers as 6.2.2.2
and check table base function.
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