CHAPTER 5
TROUBLESHOOTING
This guide is intended to assist in determining the probable causes of torch malfunctions and their
associated repairs. For each potential problem identified a probable cause and recommended repair
procedure is listed.
Section I. OXYGEN SYSTEM MALFUNCTIONS
5-1. OXYGEN LEAKS.
Table 5-1. Troubleshooting Oxygen Leaks
TYPE OF
PROBLEM /
MALFUNCTION
PROBABLE
CAUSE
RECOMMENDED REPAIR PROCEDURES
1. OXYGEN
LEAKS AT
THE COLLET
NUT.
2. OXYGEN
LEAKS AT
THE
CONTROL
VALVE NUT.
3. THE
OXYGEN
VALVE
DOES NOT
SHUT OFF
ALL THE
WAY.
a. The cutting rod not
seated against the
neoprene washer.
OR
b. The collet washer may
be dirty, worn,
damaged, or missing.
a. The control valve nut is
loose.
b. The valve nut o-ring
gasket is pinched or
damaged.
c. The control valve nut
or valve body threads
are damaged.
a. The rubber gasket is
dirty or worn.
b. The valve stem o-ring
is dirty or worn.
c. The valve stem washer
is dirty or worn.
d. The valve stem is
worn.
e. The valve stem washer
Loosen the collet nut 1/2 turn CCW. Firmly seat the rod
and tighten the collet nut. If the leak persists, remove the
collet nut, collet, and collet washer. Clean or replace the
collet washer. If the collet washer is worn and a new one
is not available, and only as a temporary/expedient
remedy, turn the washer over and replace with the
unworn face exposed.
a. Partially unscrew the control valve nut, then re-
tighten as described in the control valve re-assembly
procedures.
b. Remove the valve nut. Remove the o-ring gasket
from the valve nut, inspect and replace if necessary.
c. Remove the control valve nut and inspect the
threads. Inspect the control valve body threads.
Replace parts as necessary.
a. Remove and clean or replace as needed.
b. Follow control valve disassembly procedures to
remove the valve stem. Clean or replace the o-ring
as needed.
c. Follow control valve disassembly procedures to
remove the valve stem washer. Clean or replace as
needed.
d. Replace the valve stem and install a new o-ring.
