Miller WDW101 Owner's Manual - Page 4
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6. Service
Except when testing for leaks, shut
off gas supply at source before
servicing equipment.
Use an approved oil-free leak de-
tection fluid to locate possible
leaks.
General
Servicing is required if gas escapes from
the torch when it is on the lever rod.
If the torch and cylinder outlet valves are
closed and the regulator indicates a slow
loss in pressure when the torch is lifted
from the lever rod, the o-ring seal (Item 7)
may be damaged. Damaged o-rings allow
gas to escape past the rod assembly. This
condition may also occur at a hose connec-
tion (Items 2 and 3). Test for leaks with an
approved leak detection solution. If leaks
are
detected,
eliminate
OM-263896 Page 4
proceeding. If leaks cannot be eliminated,
do not put the equipment into service until
it has been repaired or replaced.
Valve Seat And O-Ring Replacement
Step 1. Loosen lever rod lock screw (Item
12) and seat adjusting screws (Item 11).
Remove pinion rod (Item 4) and then sad-
dle (Item 9).
Step 2. To replace o-ring, unscrew the
packing nut (Item 8) and the plunger rod
bushing (Item 6) by turning counterclock-
wise. Remove nut and bushing. The o-ring
is located in the recess in the bushing. Be-
fore installing a new o-ring, lubricate with a
lubricant compatible with oxygen. Do not
use oil.
Step 3. To replace seat (Item 5), remove
parts as indicated in previous steps. Re-
move plunger assembly (Item 5). Unscrew
them
before
the seat by turning counterclockwise and
remove from rod assembly (Item 13). Re-
place with new seat.
Step 4. Prior to reassembly, clean all parts
and the valve cavity with a clean, dry, oil-
free cloth. Degrease parts if necessary.
Step 5. Apply a lubricant compatible with
oxygen to the rod assembly and o-rings.
Do not use oil.
Step 6. Reassemble components. Adjust
seat pressure and lever rod (see Section
5).
Step 7. Check every connection and joint
from the cylinder valve to the torch tip with
an approved leak detection solution. If
leaks are detected, eliminate them before
proceeding. If leaks cannot be eliminated,
do not put the equipment into service until
it has been repaired or replaced.