Lincoln Navigator Manuals

Lincoln Navigator: Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / F Clutch. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Automatic Transmission / Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / F Clutch. Diagnosis and Testing

Principles of Operation

Symptom Chart

F Clutch

For F clutch operation,
REFER to: F Clutch (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Description and Operation).


  F Clutch


Condition Possible Sources Action
F clutch does not apply SSF mechanically stuck OFF INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch control valve stuck OFF DISASSEMBLE, CLEAN and INSPECT the F clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch latch valve stuck OFF DISASSEMBLE, CLEAN and INSPECT the F clutch latch valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch hydraulic circuit blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris, blockage and leaks. CLEAN as necessary.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
CARRY OUT the air pressure test on the F clutch.
REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing).
If a leak is detected, INSPECT the front support assembly, input shaft Teflon seals and F clutch piston seals for leaks. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
CDF clutch cylinder, clutch and planetary carrier, ring gear no. 4 DISASSEMBLE and INSPECT the CDF clutch cylinder, the clutch and planetary carrier and ring gear no. 4 for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch piston seals DISASSEMBLE and INSPECT the F clutch piston seals for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch friction plates DISASSEMBLE and INSPECT the F clutch friction and steel plates for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch always applied SSF mechanically stuck ON INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch control valve stuck ON DISASSEMBLE, CLEAN and INSPECT the F clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch latch valve stuck OFF DISASSEMBLE, CLEAN and INSPECT the F clutch latch valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch hydraulic circuit cross leaks DISASSEMBLE and INSPECT the main control valve body and separator plate passages for cracks, warping and damage. If damage is found, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
CDF clutch cylinder, clutch and planetary carrier, ring gear no. 4 DISASSEMBLE and INSPECT the CDF clutch cylinder, the clutch and planetary carrier and ring gear no. 4 for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch piston return spring DISASSEMBLE and INSPECT the F clutch piston return spring for damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch friction plates DISASSEMBLE and INSPECT the F clutch friction and steel plates for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch delayed/soft/slipping apply Incorrect transmission strategy programmed into PCM / TCM . CARRY OUT the Transmission Strategy Download and the Adaptive Learning Drive Cycle.
REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures).
REFER to: Adaptive Learning Drive Cycle (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures).
Low line pressure CARRY OUT the line pressure test. If line pressure is low, REFER to the Line Pressure Diagnosis Chart.
REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing).
SSF mechanically sticking INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the F clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch latch valve sticking DISASSEMBLE, CLEAN and INSPECT the F clutch latch valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch hydraulic circuits blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris, blockage and leaks. CLEAN as necessary.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
CARRY OUT the air pressure test on the F clutch.
REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing).
If a leak is detected, INSPECT the front support assembly, input shaft Teflon seals and F clutch piston seals for leaks. INSTALL new components as necessary. REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch piston seals DISASSEMBLE and INSPECT the F clutch piston seals for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch friction plates DISASSEMBLE and INSPECT the F clutch friction and steel plates for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch harsh apply Incorrect transmission strategy programmed into PCM / TCM . CARRY OUT the Transmission Strategy Download and the Adaptive Learning Drive Cycle.
REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures).
REFER to: Adaptive Learning Drive Cycle (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, General Procedures).
High line pressure CARRY OUT the line pressure test. If line pressure is high, REFER to the Line Pressure Diagnosis Chart.
REFER to: Special Testing Procedures (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing).
SSF mechanically sticking INSTALL a new solenoid.
REFER to: Shift Solenoids (SS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the F clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch latch valve sticking DISASSEMBLE, CLEAN and INSPECT the F clutch latch valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch hydraulic circuit blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris, blockage and leaks. CLEAN as necessary.
REFER to: Main Control Valve Body (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
F clutch piston return spring DISASSEMBLE and INSPECT the F clutch piston return spring for damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).
F clutch friction plates DISASSEMBLE and INSPECT the F clutch friction and steel plates for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Overhaul).

    E Clutch. Diagnosis and Testing

    Symptom Chart E Clutch For E clutch operation, REFER to: E Clutch (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Description and Operation)...

    Low One-Way Clutch Assembly. Diagnosis and Testing

    Low One Way Clutch For low one way clutch operation, REFER to: Low One-Way Clutch Assembly (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Description and Operation)...

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    NOTICE: Suspension fasteners are critical parts that affect the performance of vital components and systems. Failure of these fasteners may result in major service expense. Use the same or equivalent parts if replacement is necessary. Do not use a replacement part of lesser quality or substitute design. Tighten fasteners as specified.

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