6 Causes of Manual Transmission Hard to Shift

In this post we are going to discuss why cars with manual transmission sometimes have problems when it comes to shifting. The symptom of manual transmission shifting hard can occur due to a problem with the clutch or gear systems.

Top 6 Causes of Hard Shifting Transmission

The common causes of this problem are further detailed below:

1. The clutch systems

The clutch system of a vehicle is responsible for disengaging and engaging power to the transmission while in between the flywheel of the engine. There are 6 main parts on clutch systems:

  • Clutch master cylinder
  • Release cylinder
  • Clutch cover
  • Clutch disc
  • Release bearing
  • Release fork

The clutch disc and input shaft transmission are engaged together. And the clutch cover is connected to the engine’s flywheel. When you press down on the clutch pedal, The “power pressing” will transmit to the clutch master cylinder and to push the release cylinder then push release fork to disengage between clutch cover and clutch disc. That is mean at this moment the engine spin do not transmit to the transmission. This allows you to easily change gears with the manual shift stick. However, if the clutch master cylinder or release cylinder is damaged or leaks, it will make it harder to shift gears. This happen because if the master cylinder or and release cylinder damaged or leaks, it can cause loss pressure on the fluid, this can make the clutch will not disengage properly. If the clutch and engine do not disengage properly, the manual transmission will hard to shift all gears, or even totally cannot shift.

2. The Synchronizer Ring

The purpose of the synchronizer ring is to effortlessly engage the gear. The ring is made up of small teeth which allow it to smoothly be engaged by the hub sleeve and then into the main gear. If the synchronizer ring were to get damaged or malfunction in some way, it would be difficult to shift the transmission.

3. Hub Gear

Between two different gears, there is a hub gear that engages them. For example, the hub gear goes between the first gear and second gear, and it goes between third gear and fourth gear. It is really like a bridge in between these gears. Since the hub gear is connected to the transmission shaft, it cannot freely be turned. A damaged or worn out hub gear will create problems when it comes to shifting the transmission.

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