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M0076814-03
3. Connect the wiring harness (2.
Air Compressor - Check
(If Equipped)
Do not disconnect the air line from the air com-
pressor governor without purging the air brake
and the auxiliary air systems. Failure to purge the
air brake and the auxiliary air systems before re-
moving the air compressor and/or the air lines
could cause personal injury.
Illustration 63
Typical example
(1) Pressure relief valve
If the air compressor pressure relief valve that is
mounted in the air compressor cylinder head is
bypassing compressed air, there is a malfunction
in the air system, possibly ice blockage. Under
these conditions, your engine may have insuffi-
cient air for normal brake operation.
Do not operate the engine until the reason for the
air bypass is identified and corrected. Failure to
heed this warning could lead to property damage,
personal injury, or death to the operator or
bystanders.
The function of the pressure relief valve is to bypass
air when there is a malfunction in the system for the
air compressor.
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The pressure relief valve for the air compressor
releases air at 1723 kPa (250 psi). If the pressure
relief valve for the air compressor exhausts, all
personnel should be at a safe distance away from the
air compressor. All personnel should also stay clear
of the air compressor when the engine is operating
and the air compressor is exposed.
Consult your Perkins distributor for assistance.
Air Tank Moisture and
Sediment - Drain
(If Equipped)
Moisture and sediment in the air starting system can
cause the following conditions:
• Freezing
• Corrosion of internal parts
• Malfunction of the air starting system
When opening the drain valve, wear protective
gloves, a protective face shield, protective cloth-
ing, and protective shoes. Pressurized air could
cause debris to be blown and result in personal
injury.
1. Open the drain valve that is on the bottom of the
air tank. Allow the moisture and sediment to drain.
g03813903
2. Close the drain valve.
3. Check the air supply pressure. The air starting
motor requires a minimum of 620 kPa (90 psi) of
air pressure to operate properly. The maximum air
pressure must not exceed 1550 kPa (225 psi).
The normal air pressure will be 758 to 965 kPa
(110 to 140 psi).
Battery - Recycle
Always recycle a battery. Never discard a battery.
Return used batteries to one of the following
locations:
• A battery supplier
79
Maintenance Section
Air Compressor - Check
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