Cla-Val 351GF-15 - Manual (Page 3)

WARNING
Assure that the hose is not pressurized and is drained
Open the poppet by depressing the 28291-01B lockpin, which
allows the 28278-01F sleeve to be moved providing clearance
for rotation of the 28286-01B Handle.
Tool required - 0.094 (2.39 mm) Hex (Allen) Wrench. Opening
the poppet by rotating the operating handle releases the energy
of the 200277-01B Wave Spring reducing the torque required to
remove the 6 each 8-32 Socket head. Screws which retain the
28280-01E Poppet. Removing the poppet exposes the 00779K
O-Ring and allows the 28276 Seat Assembly to be removed.
Removing the 28276 seat assembly from the coupler body can
be difficult because the O-Ring (01140A) must be tight to seal
and the "low swell" compound only means it does not swell as
much in fuel. In addition, the poppet stem restricts the space
available for entrance of fingers or tools.
A seat extractor tool is available which can be placed into the
space between the poppet stem and seat seal ring, then
expands outward to engage the ring making it possible to
remove the seat seal assembly with the operating handle. To
remove the seat seal without the extractor tool, the elbow must
be removed which involves removing six nuts that join the com-
ponents.
When the elbow is removed, a 5 1/2 or 6" length of hardwood
dowel can be placed on the top edge of the seat seal assembly,
then with hammer or mallet the ring is driven out of the coupler
body. Moving the dowel from side to side cocking or jamming of
the ring can be prevented. After inspection and/or replacement
of Seat Assembly, Wave spring and O-Ring the items can be
reinstalled by placement in position-reinstalling the 28280-01E
poppet. Then rotating the operating handle to the coupler
"closed" position.
NOTE:
The 00833E O-Ring on the seat assembly is a "low swell" com-
pound Parker No. N497-70 or equal for longer service life in
Fuel.
Additional inspection and maintenance or disassembly and
reassembly should be confined to a shop environment.
Access to interior components of the "Hydrant Coupler" requires
removing the elbow with or without its disconnect assembly.
Tool required to remove elbow from coupler assembly 1/2 inch
box or open end wrench.
Remove 6 each 80638-02G (5/16-18) self-lock nuts.
Remove the 29640-01J elbow - exercise care in removing the
00794J O-Ring as it is captured in a protected location and
maybe used in reassembly.
When the elbow assembly is removed with or without the
pop¬pet seat assembly, and wave spring, a complete visual
inspection can be made of the interior from the down stream
(elbow end) of the coupler assembly including the path of com-
ponents while operating handle is in motion.
351GF-15
8-32
3