Synchronizer Cone for ZF Truck Transmissions

This synchronizer cone is offered for ZF truck transmission rebuilding enquiries. Selection depends on the gearbox model and the synchronizer assembly being serviced.

Compare the cone profile, ring dimensions, engagement teeth and component markings. Include the transmission assembly identification so the enquiry describes the correct synchronizer position.

Send the gearbox code, part number or component markings, dimensions and quantity. Include the gear position and photographs of the mating components where available.

Contact TOSEN for a quotation or browse Transmission Parts.

The synchronizer cone is the component that provides the conical friction interface at its synchronizer position in a ZF truck gearbox. As a shift begins, the mating ring presses against the cone surface, and the friction between them brings the rotating members toward a common speed before the engagement teeth take over. The cone offered here is selected by gearbox model and by the synchronizer assembly being serviced, since each position carries its own cone geometry. Replacement usually follows a teardown that finds the friction surface worn beyond service condition.

• Component: synchronizer cone, the friction interface component
• Application: ZF truck transmissions
• Selection inputs: gearbox model and synchronizer assembly
• Replacement trigger: friction surface worn at teardown

Because the cone works inside one synchronizer assembly, the selection is tied to the assembly being serviced rather than to the gearbox family alone. The cone profile and the ring dimensions of the mating parts are compared against the original, since the ring and the cone form one friction pair, and the engagement teeth are counted at the same time. Component markings on the removed parts and the transmission assembly identification complete the check and name the synchronizer position the order is for.

• Assembly check: synchronizer assembly being serviced
• Pair check: cone profile and ring dimensions together
• Teeth: engagement teeth counted against the original
• Identification: component markings plus assembly identification

TOSEN checks each synchronizer cone enquiry against the gearbox model and the synchronizer assembly recorded by the buyer. The cone profile, the ring dimensions and the engagement teeth supplied from the teardown are reviewed against the order, and the position named in the request is confirmed. Quantity and destination details complete the record before quotation.

What is the function of a synchronizer cone?

The cone provides the conical surface the mating ring works against during synchronization, so the speed difference between the rotating members is reduced by friction before the engagement teeth connect. The cone therefore decides how much friction work the synchronizer can deliver at its position. ZF truck gearboxes carry a cone at each synchronizer position, each with its own geometry.

Which wear signs call for cone replacement?

Shifts that begin to clash or grind at a gear position point to a friction pair that no longer matches speeds cleanly, and a teardown of that position shows the cone surface condition directly. Where the surface is worn, the ring that works against it is inspected at the same time, because the two form one pair. The cone is then ordered against the assembly identification.

How is the correct synchronizer position identified?

The transmission assembly identification names the synchronizer position the service is for, and the component markings on the removed parts confirm it. Each position in a ZF truck gearbox carries its own cone geometry, so the position belongs in the order from the first message. Photographs of the mating components support the identification where markings are hard to read.

What should be checked when replacing the cone?

The mating ring is inspected together with the cone, because the two form the friction pair, and the ring dimensions are compared before the order is completed. The engagement teeth of the surrounding parts are counted, and the assembly identification is confirmed against the gearbox model. Checking the pair rather than the single part keeps the rebuilt position working as an assembly.