Grizzly T21888 - Manual (Page 16)

model t21888 (mfg. since 2/10) - 14
-
Quarterly
after every approximately 300 run-time
hours, or 3 months, perform the follow-
ing maintenance:
1. Change the oil in the air compressor
pump as described in changing oil on
page 18.
2. Check for air leaks and correct as
needed.
3. pull and release the metal ring on top of
the safety valve to unseat the valve and
to ensure the valve will release air. the
pressure safety valve must be replaced
if it cannot be pulled, or if it leaks after
releasing pressure.
the pressure relief valve prevents the air
tank from exploding should the compres-
sor keep building air pressure and not
shut off automatically. the safety valve
is preset at the factory and must not be
tampered with.
pressure relief
valve test
figure 17. pressure safety valve.
pressure
relief Valve
Water will accumulate in the tank depend-
ing on usage and humidity. drain water
from the tank daily to increase the lifespan
of the compressor and air tools.
draining tank
figure 16. tank drain valve.
draining the air from the tank will be
extremely loud and debris may be
blown into your eyes from the floor.
Wear safety glasses and ear protec-
tion when draining the tank.
to drain water from the tank:
1. put on safety goggles and hearing pro-
tection.
2. leave the tank pressurized and turn
the knurled knob shown in figure 16
counterclockwise to drain the water.
unseating the pressure relief valve
will be extremely loud and debris
may be blown into your eyes from the
floor or the valve. Wear safety glass-
es and ear protection when draining
the tank.
to check the pressure relief valve:
1. Clean any dirt or dust from the pressure
relief valve shown in figure 17.
2. Allow the air compressor to build full
pressure.
Knurled
Knob