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Medium Duty Operator's Manual - Peterbilt Motors Company

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Preventive Maintenance<br />

Air System Function Test<br />

Scheduled maintenance should be performed on the <strong>Medium</strong><br />

<strong>Duty</strong> air system, as outlined in the <strong>Medium</strong> <strong>Duty</strong> Maintenance<br />

<strong>Manual</strong> and Table 5. In addition, perform an Air System<br />

Function Test at least every 3 months or if there is any<br />

indication of a potential problem.<br />

Air Tanks<br />

The front (secondary) service tank is underneath the cab, on<br />

the driver's side; the wet (supply) tank is underneath the front<br />

service tank, behind the battery box; and the rear (primary)<br />

service tank is attached to the left frame, just behind the cab.<br />

The supply tank (or “wet” tank), must be drained on a daily<br />

basis. Drain the supply tank by pulling the drain valve lanyard.<br />

Hold it open until the escaping air is free of water.<br />

The two service tanks (or “dry” tanks), must be drained on a<br />

weekly basis. Drain the two service tanks by opening the<br />

drain valves. Turn valve handles counter-clockwise, and<br />

leave open until the escaping air is free of water.<br />

Air System<br />

WARNING! If the supply and service tanks are<br />

not drained at the recommended frequency,<br />

water could enter the air lines and valves. This<br />

could cause corrosion or blockage, which could<br />

compromise the brake system safety and potentially<br />

cause an injury accident.<br />

FRONT<br />

SECONDARY<br />

(SERVICE) TANK<br />

Location of Air Tanks<br />

DRAIN VALVE<br />

REAR PRIMARY<br />

(SERVICE) TANK<br />

WET (SUPPLY)<br />

TANK UNDER<br />

FRONT SERVICE<br />

TANK<br />

02602<br />

Periodically: Clean filter screens ahead of the valves by<br />

removing the screens and soaking them in solvent. Blow<br />

them dry with pressurized air before reinstalling them.<br />

<strong>Medium</strong> <strong>Duty</strong> (R05/09) Y53-6008A – 193 –

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