Cold Fluid Check
The purpose of the cold check is to determine if the transmission has enough fluid to be operated safely until a hot check can be made.
- Bring the vehicle to a complete stop on a level surface using the service brakes.
- Ensure that the engine is at low idle RPM (500-800 RPM).
- With the service brakes applied, put the transmission in the P, PARK, position.
- Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
- Apply the parking brake and ensure it is properly engaged.
- Run the engine for at least one minute. Apply the service brakes and shift to D, DRIVE, then to N, NEUTRAL, and then shift to R, REVERSE, in order to fill the hydraulic system.
- Ensure that the engine is at low idle RPM (500-800 RPM).
- With the service brakes applied, put the transmission in the P, PARK, position.
- Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
- With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.
- Insert the fluid level indicator into the fill tube and remove. Check the fluid level reading. Repeat the check procedure to verify the reading.
- Perform a hot check at the first opportunity after the normal operating sump temperature of 71-93°C (160-200°F) is reached.
Hot Fluid Check
- Operate the transmission in D, DRIVE, range until normal operating temperature is reached. Normal operating temperature is any of the following: Sump temperature 71-93°C (160-200°F) Converter-out temperature 82-104°C (180-220°F) If a transmission temperature gage is not present, check the fluid level when the engine water temperature gage has stabilized and the transmission has been operated under load for at least one hour.
- Bring the vehicle to a complete stop on a level surface using the service brake.
- Ensure that the engine is at low idle RPM, 500-800 RPM.
- With the service brakes applied, place the transmission in the P, PARK, position.
- Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
- Apply the parking brake and ensure it is properly engaged.
- With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.
- Insert the fluid level indicator into fill the tube and remove. Check fluid level reading. Repeat the check procedure to verify the reading.
- If the fluid level is not within the HOT RUN band, add or drain as necessary to bring the fluid level to within the HOT RUN band.
Initial Flush
- Turn the J 35944-A water supply valve (1) to the ON position and allow water to flow through the oil cooler and pipes for 10 seconds in order to remove any remaining transmission fluid. If water does not flow through the oil cooler and pipes, the cause of the blockage must be diagnosed and the plugged component must be repaired or replaced. Continue with the cooler flushing and flow check procedure once the blockage is corrected.
- Turn the J 35944-A water supply valve (1) to the OFF position and clip the discharge hose (5) onto a suitable container, preferably with a lid, to avoid splashback.
- Turn the J 35944-A water supply valve (1) to the ON position and depress the trigger (8) to mix cooler flushing solution into the water flow. Use the clip provided on the handle to hold the trigger (8) down. The discharge will foam vigorously when the solution is introduced into the water stream.
- Flush the oil cooler and pipes with water and solution for 2 minutes. During this flush, attach the shop air supply 825 kPa (120 psi) to the flushing system feed air valve (2) located on the J 35944-A for 3-5 seconds at the end of every 15-20 second interval to create a surging action.
- Release the trigger (8) and turn the J 35944-A water supply valve (1) to the OFF position.
Back Flush
- Disconnect both hoses from the oil cooler pipes and then connect them to the opposite oil cooler pipe. This will allow the oil cooler and pipes to be back flushed.
- Repeat steps 3 and 4 of the INITIAL FLUSH procedure.
- Release the trigger (8) of the J 35944-A and allow water only to rinse the oil cooler and pipes for 1 minute.
- Turn the J 35944-A water supply valve (1) to the OFF position and turn OFF the water supply at the faucet.
- Attach the shop air supply to the flushing system feed air valve (2) on the J 35944-A and blow out the water from the oil cooler and pipes. Continue until no water comes out of the discharge hose (5).
Scheme 605
- Disconnect both hoses from the oil cooler pipes. Connect the oil cooler feed pipe, bottom connector, to the transmission. Connect the return pipe, top connector, to the discharge hose (5). This will require the use of J-44835-1 . Clip the discharge hose (5) onto an empty oil drain container.
- Confirm the transmission is filled with automatic transmission fluid.
- Start the engine with the transmission in PARK range and run for 5 seconds at 2,400 RPM. A minimum of 2.2 L (2.3 quarts) must be discharged during this 5 second run time. If fluid flow is greater than 2.2 L (2.3 quarts) in 5 seconds at 2,400 RPM, go to step 4. If fluid flow is less than 2.2 L (2.3 quarts) in 5 seconds at 2,400 RPM, perform the following diagnosis: Disconnect the oil cooler feed line at the radiator. Connect the discharge hose (5) to the cooler feed line. Clip the discharge hose (5) to the empty oil drain container. Start the engine with the transmission in PARK range and run for 5 seconds at 2,400 RPM. A minimum of 2.2 L (2.3 quarts) must be discharged during this 5 second run time at 2,400 RPM. Do the following according to the flow rate: Insufficient feed flow: Inspect the transmission. Sufficient feed flow: Inspect the oil cooler return pipe, the oil cooler located in the radiator, and the auxiliary oil cooler.
- Remove the discharge hose (5), connect the cooler feed and return pipes to the transmission and fill the unit to the proper fluid level. Inspect the transmission oil cooler pipe connections at the radiator, the auxiliary cooler and the transmission for leaks.
Fluid Leaks from Fluid Fill Tube and/or Vent
| Condition | Action |
|---|---|
| Dipstick loose | Tighten the cap. Replace the cap if necessary. |
| Fluid level too high | Drain the fluid to the proper level. Refer to Transmission Fluid Checking Procedure . |
| Fluid level too low | Add fluid to the proper level. Refer to Transmission Fluid Checking Procedure . |
| Breather stopped up - clogged | Clean or replace the breather. |
| Dipstick or fill tube seal worn | Replace the seals or dipstick. |
| Incorrect dipstick marking | Calibrate the dipstick. |
| Fluid contaminated with engine coolant or water | Drain and replace fluid. Locate and fix source of additional fluid. Refer to Transmission Fluid Checking Procedure and Automatic Transmission Fluid/Filter Replacement . |
Fluid Leaks from Fluid Fill Tube and/or Vent
Fluid Leaks from Transmission Input
| Condition | Action |
|---|---|
| Torque converter seal leaks | Replace the torque converter seal. Refer to Seal Replacement - Torque Converter . |
| Front support bolt seals leaking | Replace the bolt seals. Refer to Torque Converter Housing Bolt Seal Replacement . |
| Converter leaks | Inspect the converter seals, cracked converter pump tangs, converter cover, or converter housing porosity. Replace the parts as required. |
| Spin-on filter leaking | Replace the filter. Refer to Automatic Transmission Fluid/Filter Replacement . |
| Main pressure plug leak | Replace or torque the main pressure plug. Refer to Oil Pressure Test Plug Replacement . |
| Pump bushing shows excessive wear | Rebuild and repair the pump. |
Fluid Leaks from Transmission Input
Fluid Leaks from Transmission Output
| Condition | Action |
|---|---|
| Faulty or missing seal at output flange/yoke | Install a new seal assembly in the transmission rear cover. Refer to Seal Replacement - Rear Propshaft . |
| Machine lead on output flange/yoke seal surface | Replace the flange/yoke. Refer to Output Flange/Yoke Replacement . |
| Rear cover porosity | Repair or replace the cover. |
| Flange/yoke worn at seal surface | Replace the flange/yoke. Refer to Output Flange/Yoke Replacement . |
| Insufficient sealant around seal OD | Install a new seal assembly in the transmission rear cover. Refer to Seal Replacement - Rear Propshaft . |
| Damaged or missing output bolt washer seal | Replace the output bolt sealing washer. Refer to Output Flange/Yoke Replacement . |
| Damaged, missing, or loose output flange bolt | Replace and/or torque the output flange bolt. Refer to Output Flange/Yoke Replacement . |
Fluid Leaks from Transmission Output
Low Lubrication Pressure
| Condition | Action |
|---|---|
| Incorrect fluid level | Correct the fluid level. Refer to Transmission Fluid Checking Procedure . |
| Plugged suction filter | Clean or replace the oil suction filter. Refer to Oil Pan Replacement . |
| Plugged cooler circuit filter | Replace the filter. |
| Excessive internal fluid leakage | Inspect other pressures. Refer to Low Main Line Pressure in All Ranges and Low Main Line Pressure in specific Ranges, Normal Pressure in Other Ranges . Inspect the control module mounting bolts. Inspect the lubrication valve and spring. Inspect the converter housing to separator plate gasket. |
| Cooler lines restricted or leaking | Inspect for kinks and leakage. Reroute or replace lines as necessary. |
| Lubrication regulator valve sticking | Clean or replace the regulator valve. |
| Converter relief valve sticking | Clean or replace the converter relief valve. |
| Cooler plugged | Clean or replace the cooler. |
| Faulty gauge | Repair or replace the gauge. |
Low Lubrication Pressure
Contaminated Transmission Fluid
| Condition | Action |
|---|---|
| Failure to change fluid and filters | Change the fluid and install new filters. Refer to Automatic Transmission Fluid/Filter Replacement . |
| Excessive heat | Inspect the cooling system for restrictions and proper capacity. |
| Substandard fluid | Use recommended fluid. Refer to Transmission General Specifications . |
| Clutch/transmission failure | Overhaul the transmission. |
Contaminated Transmission Fluid