| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check whether there is excessive resistance when the clutch pedal is pressed.N. B.: Since this symptom is subjective, make sure that there is actually hardening compared with the previous so-called normal situation or compared with similar vehicles. | Move on to Step 1 | | |
| 1 | CLUTCH LEVER TRAVEL CHECK | All OK | Problems encountered | Operation |
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| Check, inside the engine compartment, that when the clutch pedal is pressed the clutch control lever on the gearbox completes the correct travel. | Move on to Step 3 | Clutch lever on gearbox travel incomplete | Move on to Step 2 |
| 2 | CLUTCH PEDAL CHECK | All OK | Problems encountered | Operation |
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| Clutch pedal disconnected from transmission Op. 3330B26 CLUTCH PEDAL - R+R check that the travel is free and there is no sticking or hardening | Move on to Step 3 | Clutch pedal clearance or hardening | Replace the pedal Op. 3330B26 CLUTCH PEDAL - R+R |
| 3 | VISUAL INSPECTION FOR LEAKS OR SEEPAGE | All OK | Problems encountered | Operation |
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| - Visually inspect the operating cylinder and pipes- Check that there is no seepage, leaks or damage | Move on to Step 4 | Leaks, damage or seepage from pipes and/or hydraulic connectors | Repair the defective or damaged components |
| 4 | CHECK FOR AIR IN THE HYDRAULIC CLUTCH CIRCUIT | All OK | Problems encountered | Operation |
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| Using the operating cylinder bleed screw, check that there is no air in the circuit | Move on to Step 5 | Air in the circuit | Bleed the air |
| 5 | CLUTCH CONTROL CYLINDER CHECK (ON VEHICLE) | All OK | Problems encountered | Operation |
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| - Release the cylinder from the clutch control lever, keeping it connected to the hydraulic system.- Press the pedal, producing thrust pressure and check the push rod travel.- Using a drift, retract the push rod, checking that it travels freely. | Move on to Step 7 | Clutch control cylinder malfunction | Remove the clutch control cylinder and move on to Step 6 |
| 6 | CLUTCH CONTROL CYLINDER CHECK (WITH GEARBOX REMOVED) | All OK | Problems encountered | Operation |
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| With the part at the bench, apply pressure (using compressed air) and check the push rod travel (the test mirrors what was done in the vehicle).N.B.: This test is designed to ensure that the problem is due to the cylinder and not to the pipes or the pump. | Move on to Step 7 | Clutch control cylinder malfunction | Replace the clutch control cylinder |
| 7 | CLUTCH PEDAL TRAVEL CHECK | All OK | Problems encountered | Operation |
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| With the system disconnected, check that the travel is correct when the pedal is pressed and released | Move on to Step 8 | 1. Hydraulic pump malfunction2. Hose from clutch reservoir to pump worn or distorted3. Delivery hose to clutch control cylinder worn or distorted | 1. Replace the pump Op. 1820B20 MASTER CYLINDER (PUMP) - R + R 2. Replace the hose Op. 1820B40 HOSE FROM CLUTCH RESERVOIR TO MASTER CYLINDER (PUMP) - R + R 3. Replace the hose |
| 8 | PRESSURE PLATE LEVER AND BEARING CHECK (WITH GEARBOX REMOVED) | All OK | Problems encountered | Operation |
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| After the gearbox has been removed, check that there is no hardening of the lever (as a result of dirt or insufficient greasing) and that the pressure plate bearing slides freely in its housing and shows no signs of damage. | Move on to Step 9 | 1. The presence of dirt or wear due to insufficient greasing does not allow the plate bearing to slide correctly2. Clutch release fork half-shells worn/broken | 1. Replace the faulty or damaged components2. Replace the release fork half-shells |
| 9 | CLUTCH ASSEMBLY CHECK | All OK | Problems encountered | Operation |
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| Visually inspect the condition of the clutch assembly, making sure it is not broken (pressure plate) and/or showing signs of obvious deterioration (plate).Measurements using the gauge as in the manual. | Move on to Step 10 | Obvious deterioration of the clutch plate and/or pressure plate broken | Replace the assembly |
| 10 | CLUTCH SLIDING SPLINED HUB CHECK | All OK | Problems encountered | Operation |
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| Check the following, in order:- for excess grease on the clutch plate hub bushes and the gearbox main shaft;- the condition of the main shaft and hub. | Move on to Step 11 | Main shaft damaged, hub worn, excess grease on the bushes | Replace the hub and/or main shaft |
| 11 | FLYWHEEL CONDITION CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the flywheel. In particular, check:- the state of the surface;- wear;- cuts;- presence of grease/oil on the disc surfaces;- signs of overheating | End of diagnosis | 1. Flywheel damaged2. Presence of dust in the flywheel friction seal | 1. Replace the flywheel2. Remove the dust from the flywheel friction seal. |