11
B. Inspection and spare parts
1. spares for this cylinder are as follows:
(I)
spigot ‘O’ ring (front cover)
(II)
Bush ‘O’ ring
(III)
Piston rod ‘O’ ring
(Iv)
Piston rod wiper
(v)
Piston rod ‘u’ ring
(vI)
Piston ‘u’ ring
(vII) Piston tape
the above parts can be ordered by quoting
rk sk (sk no. is stamped on the end cover).
Other spares can be ordered quoting the sk
no. and the description of the part required.
2. tube - clean tube bore and inspect for
scoring and wear. If damaged, order a new
tube. If not damaged cover with a clean
cloth and preserve.
3. Front cover spigot ‘O’ ring. remove ‘O’ ring
and inspect for damage or distortion.
If damaged, order spare ‘O’ ring. If not
damaged preserve cover and ‘O’ ring.
4. Bush - see Figure 8. remove ‘O’ ring from
bush and inspect for damage or distortion.
If damaged, order spare ‘O’ ring. If not
damaged preserve ‘O’ ring.
remove wiper seat from front end of bush
and ‘u’ ring from back end of bush with
the use of a blunt flat bladed screw driver,
taking care not to cause damage to wiper,
‘u’ ring, seating faces or bearing surfaces.
Inspect wiper and ‘u’ ring for damage
or distortion. If either is damaged order
a. spare to replace the damaged item. If
there is no damage preserve.
FIGure 8
FIGure 9
Bearings
Piston rod O-ring
note orientation
Bush O-ring
wiper seal
2 - 5 mm gap
in piston tape
Piston rod O-ring
note orientation
Position piston rod O-ring
5. Piston (Figure 9) - remove piston rod ‘O’
ring from centre bore of piston, inspect for
damage or distortion. If damaged order
spare, If not damaged, preserve.
remove piston ‘u’ ring from piston. use of a
blunt flat bladed screw driver placed in the
center of the ‘u’, stretch the ‘u’ ring over
the piston lip. this is permitted but caution
should be taken not to damage the seating
faces or ‘u’ ring itself. Inspect ‘u’ ring for
damage. If damaged order a spare. If not
damaged, preserve.
remove piston tape from piston and inspect
for wear. If piston is worn, order spare. If
not, then preserve. note the piston tape is
cut at 45° and should have a 2-5 mm gap
when fitted (see Figure 9)
6. Piston rod. Inspect for scoring and general
wear. If worn order a replacement. If not
worn, wrap in a clean cloth and preserve.
Sempell
Dewrance BleeD steam check valves
InstallatIon and maIntenance InstructIons
Bush bearings - inspect bearing surfaces.
If 75% of the bearing surface appears to be
Bronze in color, the bearings will require
replacing. this can be done by carefully
pressing the bearings out or machining
them out. either method must result in
no damage to the bush itself, as this will
cause damage or bad fitting of replacement
bearings. replacement bearings should be
ordered to the sk no. and pressed in one
from each end of the bush until in position
shown in Figure 8.
