T-SM5f Page 21 of 29
MR & MRS OPERATION TABLES
Part 4
Removing hydraulic cylinder from table base
4.35 Due to the weight of the assembly, three
persons will be required for this operation.
Proceed as follows:
i Remove the head and leg sections and, if
possible, lower the table top to its lowest
position.
ii Refer to Fig. 12 and remove plate (1) from
cylinder base cover and secure into the
exposed tapped hole the lifting eyebolt (2)
which is provided in the table tool kit Part
No. 751030 (see Illustrated Parts List,
T-IPL6).
iii Turn cylinder locking lever (3) fully counter-
clockwise and remove it.
iv With one person holding the lifting eyebolt,
a second holding the pump pedal and a third
steadying the table top, lift the cylinder from
the table base.
v When the bottom end of the ram cylinder is
lifted clear of the table base, swing the table
top and cylinder so that the cylinder (4) is
almost horizontal then lay the table top onto
a low support, pump pedal (5) uppermost,
with the bottom of the cylinder resting on a
strong wooden batten placed across the well
of the base; this will allow surplus oil to
drain into the base.
Replacing ram cup washer
4.36 Remove hydraulic cylinder from table base
(see section 4.35), then proceed as follows:
i Refer to Fig. 13 and remove cover plate (3)
taking care not to damage the sealing gasket;
the ram cup washer will then be exposed.
ii Remove washer retaining screw (6), washer
(11), ram cup washer (4) and backing disc (7).
iii Refit the backing disc (7) together with a
new cup washer (4) smearing the latter with
a little of the oil used for the table hydraulics.
iv Refit the retaining screw and its washer but
use only moderate tension to tighten the
retaining screw; too much and the ram cup
washer will tend to buckle and allow
peripheral oil seepage - too little and oil will
leak past the backing disc.
4. MAINTENANCE
v Refit cover plate (3) and sealing gasket (8),
then manhandle table into base ensuring,
before doing so, that the cylinder locking
lever (3, Fig. 12) is refitted.
Removing and cleaning ball valve
4.37. Remove hydraulic cylinder from table base
(see section 4.35) then proceed as follows:
i Refer to Fig. 13 and remove ram release
lever pivot (9) - Sellok pin or screwed pin
and lock nut - then remove ram release
lever.
ii Unscrew the four ball valve retaining screws
(10) and insert two of these screws into
tapped holes in valve flange.
iii Continue to turn retaining screws until valve
assembly is forced from its seating.
iv Disassemble ball valve assembly and
thoroughly clean all components in a suitable
solvent.
v Reassemble and refit ball valve, preferably
using a new jointing washer (2).
Changing hydraulic oil
4.38 Under normal circumstances it will not be
necessary to change the oil in the table base for
ten years. After that time change the oil, using 2.8
litres (5.0 Imperial pints) of the Eschmann
(Matburn) oil supplied (equivalent to SAE 30
motor oil).
4.39 To change the oil, proceed as follows:
i Lift table top and ram cylinder away from
table base, as described in section 4.35 then,
after draining off excess oil from cylinder
back into table base, remove table top and
cylinder assembly and lay it on its side. (Do
not stand the assembly on the bottom of the
cylinder as this will damage the relief valve
mechanism).
ii Invert table base to empty out all the oil and
clean out the oil reservoir thoroughly.
iii Reassemble the table into its base.
iv Remove oil filler cap and pour 2.8 litres (5
Imp. pints) of the hydraulic oil supplied into
the sump via the oil filler (7, Fig. 3). To do
this effectively, the oil should be added little
To Next Page
Loading...
