Sachs Hydraulic Clutch
The Sachs hydraulic clutch is a 14.5-inch (365 mm) push-type clutch that is used with the Mercedes-Benz medium-duty transmissions, models MBT520 and MBT660.
Note: All Mercedes-Benz transmission models require a hydraulic clutch system. For more information on the Mercedes-Benz transmissions, see under the heading "Mercedes-Benz Manual Transmissions."
The clutch hydraulic system consists of three main components:
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A pedal unit, including the pedal, main cylinder and fluid reservoir,
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A Secondary cylinder at the clutch,
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A hydraulic hose that connects the main and secondary cylinders.
Keep the clutch fluid reservoir full to the MAX mark. If fluid level falls below the MIN mark, have the hydraulic system checked for leaks at an authorized Freightliner service facility. Use only DOT 4 brake fluid to fill the reservoir.
The hydraulic clutch provides smooth, quiet, and reliable clutch actuation with a minimum of maintenance.
Pressure builds up in the main cylinder when the clutch pedal is pressed. This pressure is transmitted through the brake fluid in the hose to the secondary cylinder, where it acts directly on the clutch release fork.