Every 240,000 mi / 384,000 km / 3 yr
8
Main and auxiliary Transmission - Lubrication (VOCATIONAL)
• Drain and replace lubricant (See Draining the T
ransmission on page 54).
Every 500,000 mi / 800,000
km / 5 yr
Every 500,000 mi / 800,000 km / 5 yr
9
Main and auxiliary Transmission - Lubrication (ON-HIGHWAY and CITY DELIVERY)
• Drain and replace lubricant (See Draining the T
ransmission on page 54).
Air Compressor
All compressors, regardless of make or
model, run continuously while the engine is
running. System pressure is controlled by
the governor. The governor acts in
conjunction with the unloading mechanism
in the compressor cylinder block to start
and stop compression of air
. The
compressor is unloaded when the system
pressure reaches 130 psi (896 kPa), and
compression is reestablished when system
pressure falls to 110 psi (758 kPa).
Preventive Maintenance
The following service checks are provided
for informational purposes, and should only
be performed by a certified mechanic.
Contact your dealer or the engine
manufacturer's maintenance manual for
further information on servicing air
compressors. After completing any repairs
to the air system, always test for air leaks,
and check the brakes for safe operation
before putting the vehicle in service. Below
is a list of areas to maintain for the air
compressor:
8
Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
9
Ensure that all maintenance intervals leading up to this point are repeated during this interval prior to the completion of
those listed here.
MAINTENANCE - Every 500,000 mi / 800,000 km / 5 yr
50 Y53-1349-1A1 (02/2022)
6
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