ZF WSK 400 and WSK 440 Transmission Service Manual

The ZF WSK 400 and WSK 440 are synchromesh transmissions fitted to cranes and other heavy machines. The Easyshift I system shifts them with an electronic control unit and pneumatic shift cylinders. When a shift fault shows up on a machine that's out of warranty, this is the manual a technician opens. It's the repair document for tracing the fault, adjusting the switches and replacing the parts that caused it.

What this manual helps you do

• Check the electronic transmission control unit EST 11, the gear selector switch, the clutch switch and the signal booster.
• Adjust the display switches for "RANGE-CHANGE GROUP SELECTED", "GEAR ENGAGED" and "TRANSMISSION NEUTRAL".
• Replace the valve block, the output speed sensor or either shift cylinder, long or short selector lever.
• Follow the requirements and instructions for removal and installation of components, with the tightening torques for nuts and bolts.
• Verify your work with the checks section, and change pneumatic lines when they need it.

Who this is for

A crane service technician or rental fleet mechanic who has to get a WSK 400 or WSK 440 shifting properly again. Also an independent repair shop that took in a machine with no paperwork and needs the shift system laid out.

FAQ

Q: What do I receive and how is it organised?

A: One PDF file, 50 pages, in English. It runs from the preface and safety notice through the system components in the dry compartment, wet zone and on the transmission, then the gearshift mechanism and checks.

Q: Which transmission does it fit?

A: The ZF WSK 400 and WSK 440. The publication number is 6038 751 104a, and the title on the manual is "ZF Easyshift I Repair Instructions".

Q: How does it fit my repair job?

A: It's the complete manual for the Easyshift I shift system. You get a summary of the shift system on a synchromesh transmission without retarder, then component-by-component procedures you can follow at the bench or on the machine.

Download it, print the pages for the component you're working on and take them to the bench.

Click here to view the preview (PDF)

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