John Deere 000126.16 – PTP, PTI, EPC, CCU, BIF: Transmission Oil Filter Blocked in Rear Chassis

The transmission oil filter is restricted or clogged. This condition is detected by a pressure switch on the transmission oil filter that remains closed for more than three seconds while the transmission oil temperature is above 28°C (82°F) and the engine speed is over 700 RPM. A blocked filter restricts the flow of transmission oil, which can lead to poor hydraulic performance, overheating, and potential damage to the transmission system.

• 9x30 Series
• 9230
• 9330
• 9430
• 9530
• 9630
• 7x20 Series
• 7720
• 7820
• 7920
• 6M Series
• 6105M
• 6140M
• Compact Tractors
• 2025R
• Tractors equipped with PowrQuad Plus and AutoQuad Plus transmissions

1. 1

   Check the transmission/hydraulic oil level and condition, looking for a milky appearance (indicating water contamination) or metallic particles

2. 2

   Review the service history to determine if the transmission oil filter has reached the end of its service life (most common cause)

3. 3

   Warm the oil to normal operating temperature and restart the tractor to see if cycling the power clears a temporary error

4. 4

   If the code persists after a filter change, inspect the reusable suction screen in the transmission housing for debris

5. 5

   Check the old filter for metal filings, which points to a serious internal failure such as failing bearings or brake components

6. 6

   Inspect the oil filter housing and its components for any visible damage or blockages

1. 1

   Warm the oil

   Run the tractor for a few minutes to warm the transmission/hydraulic oil, which helps it drain more completely.

2. 2

   Park safely

   Park the tractor on a level surface, lower all implements, stop the engine, remove the key, and engage the park lock.

3. 3

   Prepare for Draining

   Place a suitable drain pan under the transmission filter.

4. 4

   Remove old filter

   Wipe the area around the filter to prevent contamination. Unscrew and remove the old transmission oil filter. Be aware that some oil will spill from the filter and its housing.

5. 5

   Clean and prepare new filter

   Clean the filter sealing surface on the transmission housing. Lightly coat the rubber seal of the new filter with fresh grease or clean transmission oil.

6. 6

   Install new filter

   Screw the new filter on by hand until the gasket makes contact with the housing, then tighten it according to the manufacturer's specifications (usually an additional half to three-quarters of a turn). Do not overtighten.

7. 7

   Address other filters/screens

   Operator's manuals often recommend replacing both the transmission and hydraulic filters at the same time. If the tractor is so equipped, and especially if the oil is being changed, locate and clean any suction screens in the transmission housing.

8. 8

   Check oil and finalize

   If the oil was drained, refill the system with the correct type and amount of John Deere hydraulic oil. Start the engine and let it run for a few minutes, checking for leaks around the new filter. Stop the engine, wait 10-15 minutes, and re-check the oil level, topping off as needed.