Problem | Solution |
| Low oil level | Check and add oil |
| Wrong oil grade | Check oil grade |
| Weak or broken pressure regulating valve spring | Do Transmission System Pressure Test |
| Transmission pump suction screen restricted | Remove and clean screen |
| Low transmission pump flow due to worn pump | Do Transmission Pump Flow Test |
| Transmission control valve or gasket leakage | Remove valve and inspect gaskets |
| Clutch cut-off valve sticking | Remove and inspect clutch cut-off valve |
| Restricted modulation orifice housing orifices | Remove control valve housing and check for restrictions in valve and valve
|
| Excessive transmission element leakage | Do Transmission Element Leakage Test Using System Pressure |
| Worn clutch disks | Repair transmission |
Problem | Solution |
| Low or no transmission pressure | See Transmission Pressure is low (all gears) or Transmission Pressure is low (one or two gears) |
| Service brakes will not release | Do Brake Pedal Operational Check. Do Service and Park Brake System Drag Checks |
| Park brake applied or parkswitch misadjusted | Adjust park brake switch |
| Stuck control valve spool | Check shift linkage operation. Disconnect shift linkage from control valve spool and check linkage movement. |
| Failed torque converter | Do Torque Converter Stall Test. If engine pulldown is normal, torque converter is good |
| Broken shafts or gears | Drain transmission to determine if large pieces of metal contamination are present |
| Broken drive shafts | Inspect drive shafts and universal joints for external damage. Repair |
| Broken ring or pinion gear | If drive shafts rotate with transmission in gear but unit does not move, a differential failure is indicated. Repair |
Problem | Solution |
| Low oil level | Check transmission oil level and refill if necessary |
| Switch failure | Verify transmission system pressure. Do Transmission System Pressure Test |
| Suction strainer is plugged | Transmission pump may be noisy if transmission suction screen is clogged. Drain transmission. Remove and clean suction screen. Also, check condition of transmission filter. |
| Transmission pressure regulating valve is stuck or spring is broken | Remove transmission pressure regulating valve. Inspect for damage |
| Control valve gasket failure | Inspect transmission control valve for external leakage. Remove control valve. Inspect or replace gasket. |
| Transmission pump is failed | Do pump flow test |
Problem | Solution |
| Low oil level (aeration of oil) | Check and add oil |
| Low transmission pressure | Do Transmission System Pressure Test |
| Transmission pump suction screen restricted | Remove and clean screen |
| Low transmission pump flow | Do Transmission Pump Flow Test |
| Excessive transmission element leakage | Do Transmission Element Leakage Test Using System Pressure |
| Oil passages restricted between control valve and transmission elements | emove control valve and inspect oil passages |
| Clutch cut-off valve sticking | Remove and inspect cut-off valve |
Problem | Solution |
| High oil level | Check and adjust |
| Low oil level | Check and correct |
| Wrong oil grade | Check oil grade |
| Park brake on | Release park brake |
| Lube lines pinched, restricted, or leaking | Check cooler lines |
| Unit operated in too high gear range | Operate unit in correct gear range |
| Temperature gauge or sender malfunction Install | temperature sensor to verify temperature. Do Tachometer/Temperature Reader Installation Procedure. |
| Air flow through oil cooler or radiator restricted | Do Radiator Air Flow Test |
| Oil cooler thermal relief bypass valve stuck | Bypass thermal bypass valve and check to see if unit still overheats. Do Transmission Oil Cooler Thermal Bypass Valve Test |
| Oil cooler internally restricted | Do Oil Cooler Restriction Test |
| Warped disks and plates in transmission | Do Transmission Clutch Drag Check |
| Leakage in transmission hydraulic system | Do Converter-Out Pressure Test. Do Transmission Element Leakage Test |
| Low transmission pump output | Do Transmission Pump Flow Test |
Problem | Solution |
| Engine fast idle speed set too low | Check fast idle adjustment |
| Incorrect transmission oil | Check oil |
| Aerated oil | Check and add oil |
| Low transmission pressure | Do Transmission System Pressure Test. |
| Warped transmission clutch | Do Transmission Clutch Drag Checks |
| Brake drag | Do Brake Drag Check |
| Clutch cut-off valve sticking | Remove and inspect clutch cut-off valve |
| Low engine power | Do Engine Power Test |
