MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
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Air System<br />
According to Table 11, “Air System Scheduled Maintenance,”<br />
Page 164:<br />
• Inspect compressor air filter element, if so equipped, and<br />
replace element if clogged. Check compressor mounting<br />
and drive for alignment and belt tension. Adjust if necessary.<br />
• Remove compressor discharge valve cap nuts and<br />
check for presence of excessive carbon. If excessive carbon<br />
is found, clean or replace the compressor cylinder<br />
head. Also, check compressor discharge line for carbon,<br />
and clean or replace the discharge line if necessary.<br />
• Disassemble compressor and thoroughly clean and<br />
inspect all parts. Repair or replace all worn or damaged<br />
parts, or replace compressor with a factory exchange<br />
unit.<br />
CAUTION: When draining the engine cooling<br />
system is required, to prevent damage from<br />
freezing, the compressor must also be drained<br />
at the cylinder head and block. Engine damage<br />
could occur if the cooling system is not periodically<br />
drained and maintained. See “Cooling System,”<br />
Page 145, and the Medium Duty<br />
Maintenance Manual for further information.<br />
Air Dryer<br />
Preventive Maintenance<br />
NOTE: A small amount of oil in the system may be<br />
normal and should not, by itself, be considered<br />
reason to replace a desiccant cartridge; oil-stained<br />
desiccant can function adequately.<br />
Every 900 operating hours or 25,000 miles/40,000 km or 3<br />
months, check for moisture in the air brake system by opening<br />
reservoirs, drain cocks, or valves and checking for the<br />
presence of water. A tablespoon of water in a reservoir would<br />
point to the need for a desiccant cartridge change. However,<br />
the following should be considered first:<br />
• Air usage is exceptionally high/abnormal for a highway<br />
vehicle. This may be due to accessory air demands or<br />
some other unusual air requirement that doesn’t allow<br />
the compressor to load/unload in a normal fashion or it<br />
may be due to excessive leaks in the air system.<br />
• When more than a 30-degree F. (17-degree C) range of<br />
temperature occurs in one day, small amounts of water<br />
can accumulate in the air brake system due to condensation.<br />
Under these conditions, the presence of small<br />
– 168 – PB1318 3/01 Model <strong>330</strong>