Service & Repair Manual
CAUTION: Whenever possible, use only plastic or brass O- ring tools for removing O-rings in order to prevent damage to the sealing surface. Steel instruments, such as dental picks, can easily damage the sealing surface of a softer brass part, causing irreparable leakage and requiring the part to be replaced with new.
1.Snip the plastic tie-strap(14) that holds the mouthpiece(12), and gently pull the mouthpiece off the second stage case(11). Record the serial number that is affixed directly below the mouthpiece tube, and compare it to the customer’s invoice or service record to determine whether it is eligible for warranty service (see Fig. 1). Inspect the condition of the mouthpiece to ensure that it is supple and free of any tears or corrosion. If any damage is found that could result in discomfort or leakage, discard the mouth- piece and do not reuse.
2.Slide back the hose sleeve(27) to expose the connection of the LP hose(25).
3.While holding the inlet coupling(6) secure with a w" open- end wrench, apply an n" open-end wrench to the fitting of the LP hose. Turn the hose fitting counter-clockwise to loosen and remove.
4.Using the O-ring pick that is provided in the Select Kit (PN 11-090-500), carefully remove the O-ring(26) from the post inside the hose fitting (see Fig. 2).
CAUTION: The O-ring pick is made of steel and is very sharp, and is only recommended for the removal of O-rings that cannot be removed with a brass O-ring tool. When per- forming the above step, be very careful to avoid scratching the O-ring sealing surface. Doing so may cause a perma- nent leak that will require the replacement of the LP hose.
5.While holding the diaphragm cover(2) fully depressed in the purge position, apply a w" open-end wrench to the inlet coupling and turn it counter-clockwise to loosen and remove.
6.Remove and discard the O-ring(7) from the inlet coupling. Do not reuse.
7.While holding the inlet coupling secure, apply a medium blade screwdriver to the slotted head of the valve ori- fice(5). Turn the orifice counter-clockwise until its threads have completely disengaged from the inlet coupling.
