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Only Install Clutch Disks That Have Been Tested.
The clutch disk is the component that makes the connection in the center of the clutch.
ZF SACHS recommends always checking clutch disks for lateral runout before they are installed in the vehicle.
The clutch disk is the component that makes the connection in the center of the clutch. It is a compact, very complicated component which is subjected to heavy loads. Together with the clutch pressure plate, it transfers engine torque to the transmission input shaft. It also reduces the effects of any fluctuation in engine speed on the transmission.
Check the lateral runout
In order to function optimally, new clutch disks must not exceed a maximum lateral runout of 0.5 millimeters. SACHS tests each individual clutch disk after production for clearance and only releases those clutch disks for sale which have passed the test.
During this test, ZF SACHS employees insert the clutch disks between two plates that are compressed with a defined force. The plates are then separated by a certain distance. If the clutch disk is adjusted correctly, it will be able to rotate freely between the two plates.
Checking ensures correct operation
In transit to the workshop or to the end customer, there is a risk that clutch disks are damaged during transportation, handling, or storage. Therefore, you must inspect each clutch disk for lateral runout prior to installation - using a special tool in the outer third of the clutch facing.
If the measured deviation exceeds 0.5 millimeters, the clutch disk must be corrected using a straightening device . Otherwise the clutch will not disengage properly later on. The tiny gap between the clutch disk and the flywheel or pressure plate is bridged constantly, which results in positive engagement between the engine and the transmission.
Clutch Disc Testing: The best alternative
ZF SACHS points out that a workshop employee takes just three minutes to test the lateral runout. The options for equipping clutch disks instead preventively by design changes to combat all transportation damage are severely limited. Ultracompact clutches are not feasible simply because certain functional and weight requirements must be met.
ZF SACHS sees very few alternatives in terms of packaging: A shipping carton, which protects the contents against any eventualities, would make the products far more expensive. Adding a lot more packaging material would be unacceptable from both an economic and environmental standpoint.
