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Peterbilt 579 - Page 385

Peterbilt 579
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CLUTCH
CLUTCH
Introduction
The clutch pedal transmits force from
the operator to the clutch via hydraulic
and air assist action. The clutch pedal
position is factory set and does not
require adjustment.
Clutch Hydraulic Fluid
Visually inspect the clutch uid from the
reservoir. There are molded lines with
the letters MIN to indicate minimum
uid level and MAX to indicate the
maximum uid level recommended for
proper operation. Be sure to maintain
the uid between the MIN and MAX
levels indicated on the plastic reservoir.
If the uid level repeatedly goes below
the MIN line, then it is time to have
your clutch adjusted or the hydraulic
system inspected for service.
To
replace the uid, locate the drain
tting on the air solenoid mounted to
the transmission housing. Open this
tting and allow uid to drain out of the
system. Once all the uid is drained
out, close the tting and ll the system
through the master cylinder reservoir
in the engine compartment. Once the
system is full, then purge the system of
air by simultaneously pressing on the
pedal and opening the tting to allow
air to
escape. Close the tting when
uid starts coming out. Then rell the
reservoir. Repeat this until all air has
been purged from the system.
Replace with
the recommended uid
Component Lubrication
Index on page
5-38.
5
(04/13) Y53-6047–2C 5-149

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