Diagnostic Aids
Hard shifting can be diagnosed easily. You should perform a static shift test and a dynamic shift test. Many other factors could occur, such as insufficient fluid, excessive fluid or the wrong transmission fluid. A misaligned transmission, a worn or defective clutch, or binding of the shift control can also cause hard shifting. Many internal components can also play a factor in hard shifting, such as a front bearing retainer loose or cracked, or a worn, damaged, or improperly assembled synchronizer. Failure to fully depress the clutch pedal when shifting will cause hard shifting.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests for air in the hydraulic lines, which would also cause the transmission to shift hard.
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This step inspects for a faulty shift control.
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This step inspects for faulty or worn clutch pressure plate or clutch driven plate.
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
DEFINITION: The transmission does not shift smoothly or without difficulty into another gear. | |||||||||
1 | Did you review the manual transmission symptom operations and perform the necessary inspections? | Go to Step 2 | |||||||
2 | Test the clutch pedal travel. Is there sufficient clutch pedal travel? | Go to Step 4 | Go to Step 3 | ||||||
3 | Remove any clutch pedal restrictions. Did you find and repair the condition? | System OK | Go to Step 4 | ||||||
Test for air in the clutch hydraulic system. Is there air in the hydraulic system? | Go to Step 5 | Go to Step 6 | |||||||
5 | Bleed the air from the clutch hydraulic system. Refer to Hydraulic Clutch Bleeding in Clutch. Did you find and repair the condition? | System OK | Go to Step 6 | ||||||
Inspect the transmission shift control for binding. Is the transmission shift control binding? | Go to Step 7 | Go to Step 8 | |||||||
7 | Replace the transmission shift control. Refer to Shift Control Assembly Replacement . Did you find and repair the condition? | System OK | Go to Step 8 | ||||||
8 | Inspect the transmission for the correct type transmission fluid. Is the correct type fluid being used? | Go to Step 10 | Go to Step 9 | ||||||
9 | Drain and refill the transmission with the correct type fluid. Refer to Transmission Fluid Replacement . Did you find and repair the condition? | System OK | Go to Step 10 | ||||||
Inspect the clutch pressure plate and/or clutch driven plate. Is the clutch pressure plate and/or clutch driven plate worn or faulty? | Go to Step 11 | Go to Step 12 | |||||||
11 | Replace the clutch pressure plate and/or clutch driven plate. Refer to Clutch Assembly Replacement in Clutch. Did you find and repair the condition? | System OK | Go to Step 12 | ||||||
12 |
Is there an internal bind? | Go to Step 13 | -- | ||||||
13 |
Did you find and repair the condition? | Go to Step 14 | Go to Diagnostic Aids | ||||||
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 1 | ||||||
