P36/54 T-SM47j
6.5.2.2 Traverse drive belt
To replace a traverse drive belt proceed as follows, noting
comments for later tables:
i Place the table into the ‘Service position’ as detailed
in section 1.9 (noting safety warnings) to gain access
and remove the bottom cross beam cover (item 17
of Fig. 6.7).
ii Remove the two M10 set screws in the break
attachment blocks (items 11 and 14 of Fig. 6.5)
clamping the ends of the lead screws. By turning
each lead screw or by moving the drive belt, wind
lead screws out of the traverse nuts (item 8, Fig. 6.7)
towards the head end (long trunk). Note that dome
plugs will be ejected from the attachment blocks.
iii Slacken the two M8 locking nuts to release the belt
tension as much as possible (not necessary on later
tables). Note the path of the drive belt (shown in
Fig. 6.7).
iv Remove two M6 socket head screws securing the
motor support posts to the traverse crossbeam
assembly (item 1 of Fig. 6.7). Slide motor assembly
away from the cross beam to free the drive belt.
v Remove the head end (long trunk end) limit switch
pins (item 11 of Fig. 6.7).
vi Remove the traverse nut housings (item 9 of
Fig. 6.7) one at a time. Release the old drive belt
and reassemble each traverse nut housing with the
new drive belt ensuring correct orientation of parts
(bearings should have the text facing out).
vii Loosen the traverse motor assembly belt tensioners
(not necessary on later tables) and replace the
motor assembly onto the crossbeam frame note
torque value of 9Nm. Ensure the correct routing of
the drive belt (see Fig. 6.7) and adjust the belt
tensioners*, tighten them when adequate tension is
achieved, do not over tighten to the extent that the
inner faces of the belt touch.
* Adjust tension on later tables by rotating motor
plate about support ‘A’, tighten support ‘B’ then ‘A’
when tension correct (see Fig. 6.7).
viii Run the traverse motor with a 24V d.c. supply and
check for correct belt alignment. Repeat in opposite
direction. Reposition motor drive pulley if required.
ix Power or turn lead screws back into break attach-
ment blocks and when both are correctly aligned
(the flats on the lead screws are vertical and facing
their M10 set screws, see note below) tighten the
two M10 set screws in the break attachment blocks
to clamp the lead screw, note torque setting of 20Nm.
Replace the dome plugs in attachment blocks.
Note: When tightening the M10 set screws ensure
that they only engage onto the flat of the lead screw
and do not engage onto the thread of the lead screw.
x Reassemble the table by reversing the above and
test all table functions.
6.5.2.3 Break motor
To replace a break motor proceed as follows noting that
either of the two motors could have failed and both need
to be checked:
i Traverse the table top to a suitable position and
remove the short trunk bottom covers (items 3 and
11 of Fig. 6.6) from the short trunk.
ii Remove the motor connector from the loom junction
and remove the two motor fixing screws to release
the motor. Then check that the motor has failed (and
not the control circuit) as detailed in section 6.6.7.
If the motor has failed replace it as below, or replace
the original and then check the other break motor.
iii Remove the drive connector from the old motor
before discarding.
iv Replace the drive connector onto the new motor and
reassemble the table by reversing the above (use
threadlock part number 670650 on screw threads
and see note on Fig.6.6).
v Test all table functions.
6.5.2.4 Break gearbox
To replace a break gearbox (which includes the motor)
proceed as follows:
i Traverse the table top to a suitable position and
remove the short trunk bottom covers (items 3 and
11 of Fig. 6.6) from the short trunk.
ii Remove the short trunk top cover as detailed in
section 6.5.2.6.
iii Remove connections from the break potentiometer
loom and from the break motor where they join the
break motor loom. Remove the break potentiometer
cover and then the break potentiometer loom from
the break gearbox and retain the break
potentiometer loom to fit to the new gearbox.
iv Remove the long trunk cover (see 6.5.2.6) and the
short trunk black top (see 6.5.2.12) and do not
replace black top until after recalibration. Remove
the two countersunk M8 screws that secure the arm
of the break gearbox assembly to the long trunk and
remove the short trunk side arm with the gearbox
attached.
v Remove the gearbox from the short trunk side arm
by removing the three M8 button head screws (two
at the top one underneath) and the black top location
dowel (retain for replacing into the new gearbox).
vi Reassemble the table (use threadlock part number
670650 on screw threads, see note on Fig.6.6 and
note any applicable torque values shown on Fig.
6.5 and 6.6) but note that the break potentiometers
will need to be recalibrated before refitting the black
top to the short trunk. Check Appendix 2 and proceed
as detailed in the ‘Application software manual’.
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