P30U Instruction Manual Revision : 1
1st December 2006
Page 21
Note that changing consumables should always be done by recovering the torch to the surface,
and switching the power unit off.
The electrode and nozzle are the same as the standard torch, although two different sizes
of nozzle may be used depending on the nature of the work and the depth.
As well as a retaining ring for the front cap there is a sealing ring fitted in the front
insulator that engages with the underwater front cap.
(For dry cutting the standard front cap may be used)
Silicone compound should be applied liberally around the nozzle and this seal, but not fill the space
between the seal and the front cap retaining ring as it may be caught between the two seals and
prevent fitting of the front cap.
The front insulator may be replaced if damaged using the special tool provided. This is an operation
that requires considerable care, as it is necessary to engage a fine thread in the plastic component.
The front insulator carries a second (identical) 0-ring that should be lightly coated with silicone
compound prior to fitting. It is then necessary to engage the fine thread on the outside of the front
insulator with that on the inside of the nozzle holder. Once sure that it is properly engaged, the
special tool engages with two small slots to screw the insulator fully home. Do not use undue
force!
Removal of a damaged insulator may require use of pliers or similar, if the slots have been damaged.
The contact tube can also be replaced if necessary, as on the standard torch, with the 1/8” Allen
Key
