John Deere 002602.01 – CCU: Transmission Oil Level Low

The system's sensors have detected that the transmission and hydraulic oil reservoir is below the minimum required level for safe operation. This can impede the proper functioning of the transmission and hydraulic systems, potentially leading to significant damage if not addressed promptly.

• 8130
• 8230
• 8330
• 8430
• 8530
• 8230T
• 8330T
• 8430T
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Verify the transmission/hydraulic oil level with the tractor parked on level ground

2. 2

   Visually inspect the tractor for any signs of external hydraulic oil leaks from hoses, fittings, seals, and components

3. 3

   Check for related fault codes, specifically CCU 002602.02 (Hydraulic Oil Level Sensor Fault), which indicates a sensor or electrical circuit issue rather than an actual low fluid level

1. 1

   Add Oil (If the oil level is low)

   Add the correct specification of hydraulic/transmission oil (typically John Deere Hy-Gard) through the filler neck until the level is within the correct range on the sight glass or dipstick.

2. 2

   Monitor

   After filling, operate the tractor and re-check the level to ensure there isn't a rapid loss of oil, which would indicate a significant leak.

3. 3

   Access the Sensor (If the oil level is correct, but the fault code persists)

   The hydraulic oil level sensor is a switch located in the transmission/hydraulic reservoir. Access will require locating the sensor on the reservoir housing.

4. 4

   Inspect Wiring

   Visually inspect the wiring harness and connector leading to the hydraulic oil level sensor for any damage, corrosion, or loose connections.

5. 5

   Test the Sensor Circuit

   Check for continuity or resistance across the switch terminals with the float in the low and high positions to ensure it is functioning correctly.

6. 6

   Replace the Sensor

   If the sensor is determined to be faulty, it must be replaced. This involves draining a sufficient amount of hydraulic oil to bring the level below the sensor's mounting point, unscrewing the old sensor, installing the new one, and then refilling the oil to the correct level.