Draining tank, Pressure safety valve, Monthly – Grizzly G0464 User Manual
Page 18: Quarterly
 
Model G0464/G0465/G0467/G0468/G0470 Air Compressors
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16
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Monthly
After the first 50 working hours or 30 days, 
perform the following maintenance:
1. Change the oil in the air compressor
pump as described in
Changing Oil on
Page 19.
Quarterly
After every 300 working hours or 3 months, 
perform the following maintenance:
1. Change the oil in the air compressor
pump as described in
Changing Oil on
Page 19.
2. Check for air leaks and correct as
needed.
Figure 11. Pressure safety valve.
2. Clean any dirt or dust from the pres-
sure safety valve.
3. Pull the metal ring on top of the safety
valve 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.
Note: The safety valve is preset to 
release air if the tank exceeds its maxi-
mum pressure. DO NOT try to adjust 
the safety valve pressure setting!
Some water may accumulate in the tank 
depending on usage and humidity. Drain 
water from the tank daily to increase the 
lifespan of the compressor and air tools.
To drain the tank:
1. Leave the tank pressurized and open
the drain valve, shown in
Figure 10, to
drain the water out of the tank.
 
 
Note: Draining the air from the tank 
can be extremely loud. Wear ear pro-
tection when draining the tank.
Draining Tank
The pressure safety valve prevents dam-
age to the tank by releasing pressure when 
the tank reaches maximum capacity.
To check the pressure safety valve:
1. Locate the pressure safety valve shown
in
Figure 11.
Figure 10. Tank drain valve.
Pressure Safety
Valve
Releasing the safety valve can be 
extremely loud. Protect your hearing 
with ANSI approved ear protection.
Pressure
Safety Valve