Grounding
311238ZAM 9
Motor Lubrication
Graco does not require lubrication beyond the grease
installed at the factory or through regular maintenance.
With good quality compressed air and normal ambient
conditions NXT air motors will run millions of cycles
without additional lubrication.
However, if any of the following criteria apply to your
system, you will benefit from installing a 3/4 in. air line
lubricator in the air line before the air motor or from
occasionally adding oil to an air filter cup.
• Air supply does not contain any oil.
• Air supply is very wet.
• Air supply is very dry.
• Air motor is run at low air pressure.
• Air motor is run in unusually hot or cold environ-
ments.
Areas that benefit from lubrication:
• main piston o-rings(17),
• sliding valve spool(119/108), and
• motor detent assembly (113).
Add Lubrication
The three methods for adding lubrication are described
below.
Lubricate Air Valve
Perform these steps annually, or more often depending
on your duty cycle, air pressure, and air quality. Use a
high quality lithium-based grease.
1. Remove the 10 air valve cover screws (124) and air
valve cover (112).
2. Grease all visible moving parts, especially detent
(113) and valve pistons (119).
Lubricate Air Filter Bowl
If using a motor with integrated air controls, add 50-75
ml of oil to the air filter bowl and run the motor for a few
minutes at a fast cycle rate. The oil will move through
the air valve and main piston.
Add Accessory Air Lubricator
If using an air motor with integrated air controls, add an
accessory airline lubricatorto the motor inlet. The oil
will move through the air filter.
Graco offers airline lubricators for NXT air motors.
Order 214848 (1/2 in.) for NXT 2200 and NXT 3400
air motors. Order 214849 (3/4 in.) for NXT 6500 air
motors.
If using an air motor without integrated air controls, add
a standard type filter/regulator/lubricator that is sized for
the specific air motor, such as 217073 (3/4 in.) or
217072 (1/2 in.).
Grounding
The equipment must be grounded. Grounding reduces
the risk of static and electric shock by providing an
escape wire for the electrical current due to static build
up or in the event of a short circuit.
See FIG. 2. Use the ground screw (60) and lockwasher
(61) to attach Part No. 244524 Ground Wire (GW) at the
rear of the air motor. Tighten the screw securely. Con-
nect the other end of the ground wire to a true earth
ground.
It is normal for some oil to come out through the
exhaust.
Depending on air quality you may need to change
the air filter more frequently.
The equipment must be grounded to reduce the risk of
static sparking. Static sparking can cause fumes to
ignite or explode. Grounding provides an escape wire
for the electric current.
FIG. 2. Ground Wire
