Dive Gear Express DGX Gears FIRST, First Stage Service Manual, Page: 6 / 32

This involves using a small clean plastic bag containing a small amount of lubricant. The O-ring is
inserted into the bag, worked around to evenly coat with lube while squeezing off excess, then taken
out of the bag and used in its location – Fig. 2.
Fig. 2
(26) Another way is to apply a small amount of lubricant to the gloved index finger and massage the O-
ring between the thumb and index finger. Either way works, but the bag method tends to give better
distribution results and uses less lubricant.
(27)
Under most circumstances, a lubricant should be used very sparingly or not at all. In nearly all
scuba applications, if you can see the lubricant, too much has been applied. Before using any lubricant,
any existing lubrication should be removed before new is applied. In dynamic applications, it is used to
reduce excessive wear. Static O-rings do not generally require the use of lubricant.
(28) Where parts are not necessary to be lubricated, it is good practice to avoid getting any lubricant
on them, especially when the regulator is used with high oxygen content mixes. It also helps to keep
those parts clean and free of debris that will cling to the lubricant.
Caution Note: The DGX Gears FIRST Regulator flow-through piston first stage is
primarily intended for use in inflation and light scuba applications such as oxygen
decompression. When used as an inflation regulator, the Over Pressure Valve
(OPV) that is supplied with the regulator must be used to ensure the safety of the
diver should the Intermediate Pressure rise unexpectedly. When used as a
decompression regulator, the second stage acts as an overpressure valve.
Caution Note: The output pressure of the regulator is set at the factory to 120
PSI. Following the service instructions and using the authorized parts kit will
restore the regulator to this setting. The OPV is set by the factory at 180 PSI.
When rebuilding the OPV using the provided materials in the service kit, pay close
attention to the position of the OPV Bullet/Spring Holder when screwed into its
housing.