JATCO CVT单位追逐轴承噪声

轴承噪声s can be difficult to track down even in familiar transmissions which we work on daily. The advantage of the familiar is that we know how to take these units apart and have a general idea of power flow and overall operation. Plus, we typically have plenty of extra pieces on the shelf should we need them. Bearing noises in the CVT传播更难处理，因为它并不像每天在门口滚动的单位一样熟悉，并且备用CVT碎片几乎不存在。这是在接受CVT修复时创造了一些次要的偏执狂。希望本文将消除有关这些单位的一些担忧，并证明 - 通过合适的工具和一点专有技术 - 可以修复CVT，并成为商店的体面的货币制造商。

For this article we'll reference the JF011E, but all Jatco models are similar when it comes to bearings. The most common abnormal bearing noise concern with these units is related to a rotational whining noise in Forward or Reverse. The noise gets worse as vehicle speed increases — sometimes it may even sound like a differential noise. A pan examination will reveal a magnet with a good amount of steel hair on it, which means there is something “making metal.” This happens when the pulley bearing races become pitted, causing metal flaking. To address the problem, the bearings must be replaced, and that requires unit removal.

Once the transmission is out of the vehicle, remove the valve body so that the ratio control motor and arm can be disconnected from the ratio control motor follower. Next, detach the rear cover and pulley assembly from the case. Once the rear cover is removed, take out the bearing retaining bolts (图1) so the pulley assemblies and belt can be removed from the cover. Wrap two nylon zip-ties around the belt (图2.）在拆除之前防止它分开（不是很好的情况！）。

图1	图2.

图3.shows a close-up of something to be aware of: the arrow on the belt that shows the correct rotation direction. You’ll need this for reference when the belt is reinstalled into the pulley assemblies, because putting the belt on backwards will damage it and the assemblies.

图3.

下一步是打开辅助滑轮，以便可以移除......但首先，您需要手头拥有正确的工具。次级带轮在滑轮可以打开之前必须压缩的大弹簧。完成此过程的工具包，以完成此过程非常值得和可在售后市场提供。他们的工作如下：

1。分流环围绕次要滑轮的钟形区域螺栓，两臂连接到分流环保持螺栓。

2。The upper puller assembly and threaded bolt are attached to the top of the arms with two bolts and nuts (图4.）。

图4.

3.一旦拉链的分体环和上部设定到位，拧紧中心螺栓就会缓解弹簧张力并允许开口二次滑轮（图5.）。

图5.

4.Lift the puller assembly and the secondary pulley out of the cover, then place it inside the primary pulley opening (you may want to put a rag over the primary pulley face to prevent scratching).

图6.	图7.

5。现在，将皮带抬过初级滑轮并从盖子中取出（图6.and7.）。有些单元在后盖和轴承之间有垫片（图8.）需要保存在重新组装期间的使用。

图8.

图9.and10.show the location of the bearings on both the secondary and primary pulley assemblies. There is a primary pulley bearing for the torque converter side and one for the cover side, along with a cover-side secondary pulley bearing. These bearings can be removed with a two-jaw bearing puller or a bearing splitter and puller assembly and pressed back into place with ease. Replacement bearings are readily available in the aftermarket for most CVT units..

图9.	图10.

Jim Dial是一个Sonnax技术专家。