3CX, 4CX
The hydraulic pump drive yoke is a key component that transmits torque from the driveshaft to the pump shaft. If you have experienced a sudden loss of all hydraulics, hear loud metallic noises and vibrations from under the machine, and the driveshaft is spinning while the pump is stationary, these are classic symptoms of a failed yoke or a sheared key. Continued operation is impossible and risks damaging the hydraulic pump shaft.
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High Torsional Strength
Reliable power transfer
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Precise U-Joint Bores
No vibrations, long service life
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Perfectly Matched Bore
No play, secure fit
The accuracy and quality of materials guarantee long and trouble-free use without the need for frequent replacement.
The yoke is fully adapted to work with original driveshafts and pumps, ensuring a consistent repair.
The GX-AFTER brand is a proven and safe alternative that offers quality comparable to original parts at a much better price.
Installing a new yoke on an old, worn U-joint will cause immediate wear of the new part's bores. These components should always be replaced together.
Before installing the new yoke, thoroughly check the condition of the pump shaft and keyway. If they are worn, the new yoke will be damaged quickly.
Always use a new, tight-fitting key. Reusing an old, worn key will cause play and rapid destruction of the yoke.
After installation, generously grease the U-joint through the nipple. Use high-quality grease, such as HYPTRON, and replenish it regularly according to the service intervals.
Answer: Yes, this is very likely. If the pump driveshaft is spinning but the pump is not, it most often means the yoke has sheared or the key has been cut.
Question: I hear knocking from under the machine. What could it be?Answer: Loud, metallic knocking could come from a worn U-joint that has damaged the bores in the yoke. In this case, both components should be replaced.
Question: What is the main cause of failure for this part?Answer: The most common causes are U-joint failure due to lack of lubrication, material fatigue of the yoke itself, or mechanical damage from hitting an obstacle under the machine.
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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