Case IH 735-00 - DEC – Transmission Controller / TCU: Transmission C2 clutch solenoid maximum calibration current limit exceeded

The system attempts to calibrate the C2 clutch but the electrical current required by the C2 clutch solenoid exceeds the maximum allowable limit. This prevents the clutch from calibrating successfully.

• MAGNUM AFS Connect
• MXU110
• MXU115
• MXU135
• 5120
• 5130
• 5140
• 5150
• MX255
• MX285
• 9270
• 9280
• 9310
• 9330
• Bearcat
• Cougar
• Panther
• 1896
• 2094
• 2096
• 2294
• 2394
• 2594
• 3294
• 3394
• 3594
• 4494
• 4694
• 4894

1. 1

   Air Pressure Test: Apply air pressure to the C2 clutch pressure pipe port to check for internal leaks. Listen for air escaping in the forward gearbox section (the C1/C2 clutch section). You should be able to clearly hear the clutch piston movement; if air escapes without building pressure, there is a mechanical leak preventing calibration.

2. 2

   Electrical Circuit Check: Verify the transmission temperature sensor, wheel speed sensor circuits, and the 5-volt reference circuits, as failures or shorts in these systems can disrupt the transmission controller's ability to calibrate the clutches.

3. 3

   Switch Verification: Ensure the clutch disconnect switch is not misadjusted (e.g., adjusted too high) or short-circuited (always closed).

1. 1

   Locate manifold

   Locate the transmission control valve manifold which houses the electro-hydraulic solenoids.

2. 2

   Remove retaining pins

   Using a suitable punch, remove the retaining pins from the manifold.

3. 3

   Remove valve components

   Remove the plug, spring, and the lubrication proportional valve.

4. 4

   Inspect proportioning valve

   Inspect the C1/C2 lubrication proportioning valve (which is moved by C2 clutch pressure) for binding, wear, or debris.

5. 5

   Replace solenoid or coil

   Replace the faulty C2 clutch solenoid or coil as necessary.

6. 6

   Lubricate components

   Lubricate all components with CASE IH AKCELA NEXPLORE™ FLUID prior to reassembly.

7. 7

   Reinstall components

   Reinstall the manifold components and retaining pins.

8. 8

   Perform calibration

   Perform a transmission clutch calibration. The tractor must be driven, and the clutch pedal depressed to enable the transmission calibration sequence via the electronic diagnostic tool or cab display.