CAT: 8612 November 2019
Page 273
PREVENTIVE MAINTENANCE
TRANSMISSION SERVICE INTERVALS
For recommended types and brands of all lubricants, see the transmission
manufacturer’s Service Manual and Recommended Service and
Maintenance Schedules pages 315-342 and fluid quantities, page 333.
Maintain the oil level and check it regularly. Oil should be level with the
bottom of the filler plug hole with Manual, PACCAR and UltraShift PLUS
Transmissions.
CLUTCH SYSTEM
GENERAL INFORMATION
The hydraulic clutch system consists of a clutch pedal, which contains a
push rod that is mounted on the fire wall of the cab. This push rod extends
through the cab fire wall and engages the hydraulic master cylinder mounted
to the clutch pedal assembly, on the fire wall in the engine compartment.
This hydraulic clutch pivots approximately 13mm to engage the clutch.
Pressing in the clutch pedal will apply pressure to the hydraulic fluid. The
fluid pressure applies force to an air servo, in addition to applying force to
the clutch fork actuator, in the clutch servo mounted to the transmission.
When the air servo is opened, compressed air is allowed to assist the
hydraulic pressure and move the clutch fork actuator.
When the clutch pedal is released, the air servo will close and compressed
air will exhaust out the exhaust port.
Clutch adjustment (at the clutch pressure plates) is needed when the
pedal reaches the furthest down/stop position in the pedal assembly,
followed by a decreased effectiveness of the clutch brake.
Always disconnect the air supply from the clutch servo before
removing the clutch servo from the transmission. Do not install
and pressurise the air system until the clutch servo is secured back
onto the transmission. Failure to do so may result in a buildup of air
pressure against the back plate which may lead to personal injury
or death.
Brake fluid may be a hazard to human health and the environment.
Always dispose of brake fluid in accordance with applicable
regulations.
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