Grizzly G470 - Manual (Page 21)

Model G0464/G0465/G0467/G0468/G0470 Air Compressors - 19
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Figure 12. Oil sight glass.
5. Replace the oil sight glass and remove
the fill plug shown in Figure 12.
6. Fill the crank case with oil until the oil
level is in the center of the sight glass,
then replace the oil fill plug.
Oil Fill
Plug
Oil Sight
Glass
Symptom Possible Cause Possible Solution
Air leaks from pressure
switch. 1. Faulty check valve.
2. Faulty pressure switch.
1. Repair the check valve
(see Page 19).
2. Replace pressure switch.
Air is dirty or has exces-
sive moisture. 1. Tank is not drained.
2. Delivery pipes are dirty.
1. Open drain valve and
make certain all the water
is drained out.
2. Remove delivery pipes,
clean out and replace.
Changing Oil
Change the oil in the air compressor pump
after the initial 50 hours, or 30 days of use;
and every 300 hours, or 3 months after the
first oil change. Use compressor oil or ISO
100/SAE 30W, non-detergent type oil.
To change the oil:
1. Unplug the air compressor and drain
all the air from the tank.
2. Place a container to catch the oil under
the oil sight glass.
3. Use a box end wrench or a socket
wrench to remove the oil sight glass
shown in
Figure 12.
Check Valve
The diaphragm and O-ring in the check
valve can become damaged, twisted, or
dirty and cause the check valve or pres-
sure switch to leak air.
To fix the check valve:
1. Unplug the air compressor and drain
all the air from the tank.
2. Remove the cap from the check valve
(see Figure 13).
Figure 13. Check valve.
4. Tip the compressor to drain all of the oil
from the crank case.
Cap