Low/Reverse Clutch Assembly
Low/Reverse Clutch
For low/reverse clutch operation, REFER to: Transmission Description . Refer to: Low/Reverse Clutch Assembly .
Low/Reverse Clutch
| Condition | Possible Sources | Action |
|---|---|---|
| Low/Reverse clutch does not apply | SSD solenoid filter blocked | CLEAN or INSTALL a new solenoid. Refer to: Solenoid . |
| SSD is mechanically stuck OFF | INSTALL a new solenoid. Refer to: Solenoid . | |
| Low reverse/overdrive (4, 5, 6) clutch regulator valve stuck off | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. If bore or valve is damaged, INSTALL a new main control. Refer to: Main Control Valve Body . | |
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or leaking. | DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Transmission Description . | |
| Clutch bypass valve stuck in default position | DISASSEMBLE, CLEAN and INSPECT the multiplex shift valve. If bore or valve is damaged, INSTALL a new Clutch bypass valve. Refer to: Main Control Valve Body . | |
| Low Reverse clutch main control-to-transmission case seal | REMOVE the main control valve body, Refer to: Main Control Valve Body . INSPECT the CBR1 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. | |
| Rear planetary carrier/center ring gear | INSPECT the planetary carrier/center ring gear for wear and damage that would prevent the gear from being held. INSTALL new components necessary. Refer to: Transmission . | |
| Low/Reverse clutch friction plates | DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission Description . | |
| Low/Reverse clutch piston seal leakage | INSTALL a new low/reverse clutch piston. Refer to: Transmission . | |
| Center support cracked or leaking. | INSPECT the center support for damage. INSTALL new components as necessary. | |
| Low/Reverse clutch always applied | SSD O-rings damaged/leaking | INSTALL a new solenoid. Refer to: Solenoid . |
| SSD mechanically stuck ON | INSTALL a new solenoid. Refer to: Solenoid . | |
| Low reverse/overdrive (4, 5, 6) clutch regulator valve stuck ON | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and spring. If bore, valve, or spring is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body . | |
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits cross leaking | DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leakage. CLEAN as necessary. Refer to: Transmission Description . | |
| Low One-Way Clutch (OWC) | INSPECT the Low One-Way Clutch (OWC) for free rotation in over-run direction. INSTALL new components as necessary. Refer to: Transmission Description . | |
| Low/Reverse clutch friction plates | DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission . | |
| Low/Reverse clutch piston return spring | INSPECT the return spring for damage. INSTALL new components as necessary. Refer to: Transmission . | |
| Low/Reverse clutch delayed/soft/slipping apply | Incorrect Transmission Strategy programmed into PCM | Remove SSD and record solenoid band number. Refer to: Solenoid . Using the scan tool, verify the correct band number is stored in the PCM. If band numbers do not match, replace SSD with correct band number. |
| SSD filter screen partially blocked or restricted. | CLEAN or INSTALL a new solenoid. Refer to: Solenoid . | |
| SSD mechanically sticking | INSTALL a new solenoid. Refer to: Solenoid . | |
| Low reverse/overdrive (4, 5, 6) clutch regulator valve sticking | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body . | |
| Low reverse/overdrive (4, 5, 6) clutch latch valve stuck ON | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch latch valve. If bore or valve is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body . | |
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or leaking | DISASSEMBLE and INSPECT the main control and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Transmission Description . | |
| Low Reverse clutch main control-to-transmission case seal | REMOVE the main control valve body, Refer to: Main Control Valve Body . INSPECT the CBR1 circuit seal between the main control valve body and the transmission case for missing or damaged seal. INSTALL a new seal. | |
| Low/Reverse clutch friction plates | DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission . | |
| Low/Reverse clutch piston seal leakage | INSTALL a new low/reverse clutch piston. Refer to: Transmission . | |
| Center support cracked or leaking. | INSPECT the center support for damage. INSTALL new components as necessary. | |
| Low/Reverse clutch harsh apply | Incorrect Transmission Strategy programmed into PCM | Remove SSD and record solenoid band number. Refer to: Solenoid . Using the scan tool, verify the correct band number is stored in the PCM. If band numbers do not match, replace SSD with correct band number. |
| SSD mechanically sticking | INSTALL a new solenoid. Refer to: Solenoid . | |
| Low reverse/overdrive (4, 5, 6) clutch regulator valve sticking | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch regulator valve and spring. If bore, valve or spring is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body . | |
| Low reverse/overdrive (4, 5, 6) clutch latch valve stuck OFF | DISASSEMBLE, CLEAN and INSPECT the low/reverse clutch latch valve and spring. If bore, valve or spring is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body . | |
| VBS CBR1/456, CBR1/456, CBR1 hydraulic circuits blocked or leaking | DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. Refer to: Transmission . | |
| Low/Reverse clutch friction plates | DISASSEMBLE and INSPECT the low/reverse clutch friction and steel plates. INSTALL new components as necessary. Refer to: Transmission . | |
| Low/Reverse clutch piston return spring | INSPECT the return spring for proper installation and damage. INSTALL new components as necessary. Refer to: Transmission . | |
| - | Center support cracked or leaking. | INSPECT the center support for damage. INSTALL new components as necessary. |