P30/54 T-SM47j
6.4 TABLE COLUMN COMPONENTS
6.4.1 The following parts on the table column may need
replacement in the event of wear, damage, or malfunction
(see notes below in each section). The procedures for these
are detailed in the sections that follow:
6.4.2 Trendelenburg actuator
6.4.3 Tilt actuator
6.4.4 Telescopic column assembly
6.4.5 Tilt and Trendelenburg actuator motor
6.4.6 Tilt bushes
6.4.7 Trendelenburg bushes
6.4.8 Bearing Pads
Fig. 6.2 and 6.3 show the general arrangement and identify
the main parts of the table base assembly and column,
refer to these as required.
6.4.2 Trendelenburg actuator
To replace the Trendelenburg actuator if damaged, worn
or has failed (see section 6.6.8 to test motor and 6.4.5 for
motor replacement) refer to Fig. 6.3 and proceed as follows:
i Gain access to the top of the column as detailed in
section 6.2.3.
ii Remove motor cable spade connectors from where
they connect onto the mid-column PCA (note two
sizes to aid correct connection) and the earth lead.
iii See safety warnings in section 4.0 as the table top
will not be stable during the following procedure.
Remove the ‘R’ clips from the top and bottom pivot
pins, remove the pins and remove the Trendelenburg
actuator.
iv Before refitting a new Trendelenburg actuator check
both pivot pins for wear and replace as required.
v Replace the Trendelenburg actuator by the reverse
of the above and remake connections.
vi Reassemble table recalibrate Trendelenburg and
carry out a function test.
6.4.3 Tilt actuator
Replacement of the Tilt actuator (see section 6.6.8 for motor
test details and 6.4.5 for motor replacement) is similar to
replacing the Trendelenburg actuator as detailed above in
section 6.4.2, follow this to replace the tilt actuator (note
no earth connection on tilt actuator). Recalibrate Tilt.
6.4.4 Telescopic column assembly
WARNING
Removal and replacement of the telescopic
column assembly entails lifting the trunk
sections, the complete wrapround assembly and
blocking up the base assembly. These
procedures require two people to perform safely,
do not proceed unless two people are available.
To replace the telescopic column assembly (see section
6.6.9 for test details) place the table on a flat surface in the
braked orientation and proceed as follows:
i Gain access to the top of the column as detailed in
section 6.2.3.
ii Remove trunk sections as detailed in section 6.2.5
for bellows replacement (also see safety warnings
section 4.0).
iii Remove the connector of the loom coming out the
top of the cable guide chain, from the four actuator
PCA, by pressing the release clips moulded into the
plug.
iv Release the column energy chain (two screws top
and bottom, may be hidden under cables) from the
wrapround assembly removing cable ties as
required (replace these on assembly).
v Release (see note below) the lower end of the height
potentiometer cable from the base plate and allow
it to slowly retract back. NOTE: DO NOT ALLOW
CABLE TO SNAP BACK.
vi Loosen the wrapround/column slide bearings screws
at the lower edge of the wrapround.
vii Remove the top of column cover to gain access to
the four top of column cap head screws and remove
them.
viii Lift the complete wrapround assembly up and off of
the telescopic column assembly and carefully place
to one side, leaving it in a stable position not resting
on any fragile components.
ix Using suitable blocks jack up the table base (keep
blocks clear of castors and wheels) to obtain access
to the underside of the table base plate. Remove
the four cap head screws that secure the telescopic
column assembly to the table base plate.
x Note the orientation of the telescopic column
assembly (by noting position of leads at the top of
the assembly) and remove it from the base plate.
xi Replace the new telescopic column assembly, apply
threadlock (part number 670650) to the screws and
tighten to 40Nm.
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