26
Servicing
Nitrogen charging
3
The pneumatic system of the pedestal is a closed circuit, and normally maintains a given pressure for a
long period. However, the charge pressure may need to be varied for load changes in which case, the nitrogen
charging procedure given in Section 2 must be followed.
Leak check
4
Carry out the leak check as follows:
4.1
Place a suitable load (approximating to normal payload) on the head mounting platform,
disengage the two platform locking bars and raise the column to its full extent.
4.2
Remove load from head mounting platform.
4.3
Lay the pedestal on its side so that the steering ring supports the column.
4.4
Apply a soap and water solution to the manifold block, the area at the base of the ram, the safety
valve and the charging valve. The appearance of bubbles indicates leaks.
4.5
If leaks are apparent, consult
for the appropriate remedial action.
Safety valve check.
5
It is suggested that this check be carried out at yearly intervals. Proceed as follows:
5.1
Fit nitrogen charging equipment (Part No. 3702-32) or similar to charging point and depressurize
pedestal completely.
5.2
, remove safety valve (2) and bonded seal (1) from tank. Remove nitrogen
charging equipment from charging point.
5.3
Connect nitrogen charging equipment to nitrogen supply ensuring that a suitable pressure
reduction valve is fitted between the gas cylinder and the supply point
5.4
Connect pressure relief valve to outlet side of charging equipment.
5.5
Set pressure reduction valve to 280psi (19.31bar) and pressurize line, increasing pressure in
steps of 5psi (0.34bar) until relief valve opens. The valve should operate at 308psi (21.24bar) However,
WARNING!: This pedestal must be charged only with clean dry air or nitrogen. A pres-
sure reducing valve must be fitted to the pressure line between the nitrogen cylinder
and the outlet connection of the hose. The reducing valve must be screwed into the
nitrogen cylinder outlet. The maximum pressure on the outlet side of the reducing valve
when charging this pedestal must not exceed 280psi (19.31bar).
NOTE:
It is recommended that this check is only carried out when it is apparent that a pressure
loss has taken place. To carry out the check it is necessary that the column be at full
extension.
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