7.2 Coupler Assembly Removal/Replacement
Note:
The coupler assembly is replaced as part of a major overhaul of the torch or
when damaged by a catastrophic flashback. During the normal course of
operations it should not be necessary to remove or replace the coupler assembly.
The repair procedure calls for securing brass components in a vise. Note that brass
is a soft metal that bends or distorts easily. Damage to torch parts can affect fit-up
and cause oxygen leakage, making the torch unsafe to operate.
1.
Disconnect the oxygen hose from the torch hose adapter.
2.
Remove the collet nut and the collet.
3.
Remove the nylon screws (4) securing the torch handle grip. Remove the left
and right side handle grips. Carefully remove the nylon nuts (4) from the right
side handle grip and set aside.
4.
Disengage the valve lever screw from the brass lock nut and remove the
control valve lever.
5.
With the valve assembly exposed, secure the torch head in a vise.
6.
Using a 9/16” open end wrench, unscrew the brass hose connector and
remove it from the torch head. Remove the torch head from the vise and set
aside.
7.
Secure the valve assembly in a vise with the coupler exposed.
8.
Using a 7/16” open end wrench, unscrew the hose connector and remove it
from the top of the valve assembly to remove the coupler assembly.
9.
Reassemble by following steps 1 through 8 in reverse order. Use PTFE tape on
threaded hose fittings to prevent oxygen leakage. Do not over-tighten
threaded fittings.
Summary of Contents for Prime-Cut
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