Operating instructions

10
(1) Loosen the lower pan head screw on the stainless straps (if fitted with locking
collars). Remove any sealing compound from screw holes to reveal screws.
Loosen the socket set screws “A” from the collar, except the one securing the
Nylatron key “B”. Note there are two screws in each hole. The outer screws are
shorter and used to lock main screws.
(2) Holding the collar onto its tube, pull out all the remaining sections (keeping them
together as one unit) until the tube stop “C” is against the collar.
(3) Taking care to support the extended sections, slide the collar away from the
bottom tube. Continue pulling the extended sections out until the piston is free
from the bottom tube.
(4) Remove the air inlet valve from the base of the mast or spares kit and fit into the
tapped hole “D” in the exposed position. With a foot pump attempt to extend the
remaining sections. If they extend it will indicate that the exposed seal is the one
requiring replacement. If they do not extend, expose the next piston and seal
using the same procedure – and so on – until the faulty seal is located.
Since it is unusual for a seal to fail, it is necessary at this stage to establish the cause
if possible. If small particles of metal are found around the seal, it usually indicates
that something has scraped the tube. This can happen if the mast has been violently
abused, if some modification with different screws or clamps have been fitted by the
customer or if the mast has not been serviced and lubricated regularly.
O-RING
PISTON
PTFE SLIDE RING
SEAL
SCREW SELF TAP
ST/ST BAND