T-SM5f Page 23 of 29
MR & MRS OPERATION TABLES
i Note the direction of tread pattern of the worn
pad (11, Fig. 5), before removing pad.
ii Remove the two hex screws (10, Fig. 5)
securing brake pad to frame and install new
pad, with the tread pattern facing in the same
direction as that noted in (i) above.
Replacing brake quadrant
4.44 If the base control pedal movement is uneven
and jerky the quadrant teeth may be damaged. This
can be ascertained by feeling with the fingers under
the table base. Tilt the table to expose the base
underside (see section 4.3) then proceed as follows:
i Refer to Fig.5 and remove socket head stop
screw (12) from beneath cut-out end of
quadrant (14).
ii Turn the quadrant clear of the roller (16)
remove hex. nuts (17) and withdraw the
quadrant. If quadrant teeth are broken, fit
new quadrant. For renewal of quadrant
pinion, carry out the procedure detailed in
the following paragraph.
Replacing quadrant pinion
4.45 Symptoms of jerky movement on base
control pedal could also be due to broken quadrant
pinion teeth. Verify as section 4.44 for broken
quadrant. Tilt the table to expose the base
underside (see section 4.3) then proceed as
follows:
i Remove quadrant (see section 4.44).
ii Refer to Fig 5 and turn base control pedal
(9) until small end of taper pin, securing
pinion (13) can be seen.
iii Using a hammer and punch, carefully knock
out taper pin.
iv Slacken the grub screws in the two collars
(18) on the brake shaft.
v Pull base control pedal and shaft out of table
base, allowing quadrant pinion to fall clear.
vi Position new pinion on shaft, lining up the
taper pin drillings in the pinion with those
on the shaft. Maintaining the tapers in line,
ream the pinion drilling relevant to the shaft
and loosely fit taper pin. Remove taper pin
and pinion from shaft.
4. MAINTENANCE
Part 4
vii Locate base control pedal shaft in table base
with collars and spring, and secure collars
in correct position. Install pinion on end of shaft
and fit taper pin.
viii With base control pedal in ‘castor’ position (see
diagram on base instruction plate) install
quadrant between roller (16) and eccentric pin
(19). Ensure that quadrant and pinion mesh
correctly and that the base control pedal is
parallel with the base instruction plate in the
‘wheel’ position, before fitting stop screw (12)
to quadrant. Check that brake pads are just
clear of the floor in the ‘wheel’ position.
ixThe eccentric pin (19) should be adjusted to take
up any excessive play between quadrant and
roller.
Replacing broken quadrant pillar
4.46 Proceed as described in section 4.44 to
remove quadrant, then remove and replace broken
quadrant pillar (20, Fig. 5). Reassemble
components.
Replacing main control handle
4.47 For the MR table only, the following
procedure must be carried out:
i Place table top in reverse Trendelenburg
position and remove gearbox cover.
ii Refer to Fig. 6 to identify gear selector shaft
(3). Improvise a suitable distance piece to
force the selector shaft outwards against its
spring bias. This is to ensure that when the
taper pin is removed from the handle shaft
the taper pin hole does not disappear inside
the gearbox as the selector shaft is drawn in
by spring tension.
Now refer to Fig. 16 and proceed as follows for
all MR series tables:
iii Punch out taper pin (1) and remove
damaged handle (2).
iv Take measurement for drilling new handle,
then drill (one side only) a suitable diameter
hole to allow use of a tapered reamer.
v Slide new handle onto shaft (3) and align
hole through shaft with newly drilled hole
in handle.
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