BG TFX Transmission Fluid Exchanger

IMPORTANT! The BG Transmission Service is a maintenance service, not a repair service! A thorough inspection of the transmission, including lines and coolers, should be performed and all repairs made before performing this service. Check the vent on top of the transmission to be sure it is open and functioning. Inspect seal areas and gaskets, and replace any that are leaking or badly deteriorated. If the pan gasket needs replacing, it is recommended that the transmission filter be replaced as well. The filter should be changed anytime the pan is removed. Check hoses, metal lines, and connections to ensure all are in good repair.

1. Start the vehicle’s engine and run until normal operating temperature is reached.
2. Check transmission fluid level. If it is more than 32 oz. (946 mL) low, add fluid, but leave room for 11 oz. (325 mL) of BG Quick Clean for Transmissions, PN 106. Do not overfill transmissions.
3. Shut off engine and locate a junction in either of the two transmission lines that will allow you to install one of the included adaptors to each end of the junction. See “Possible Points to Make Connections” in this manual. Separate the line at the chosen junction and attach adaptors. Use pinch off clamps on rubber lines to prevent transmission fluid loss while connections are being made.
   NOTE: Some vehicles also use the radiator to help cool the engine oil. Be sure the lines you are working with actually go to the transmission and not the engine!
4. Press and hold the Pressure Release (PR) button on the fill block of the BG TFX to be certain that there is no pressure in the machine.
5. Connect BG TFX service hoses (H1 and H2) to adaptors. Either hose can be attached to either adaptor—flow direction will be corrected after the vehicle’s engine is started.
6. Turn the Service Selector (V1) to “OFF” (O) and connect the machine to shop air. Start the vehicle’s engine and check for leaks.
7. Determine flow direction through the Sight Glass (SG); flow should be from right to left. Correct flow direction, if required, using the Correct Flow Knob (V2) by turning the Correct Flow Knob (V2) 90°.
   Caution: Service Selector (V1) must remain in “OFF” (O) position until flow direction has been corrected.
8. Add the contents of one 11 oz. (325 mL) can of BG Quick Clean for Transmissions, PN 106, into the Additive Funnel (F2). Turn the Service Selector (V1) to the “ADD” (+) position to draw in cleaner. Run the pump until fluid is drawn in, plus an additional 15 seconds to ensure the fluid ends up in the vehicle. Set the Service Selector (V1) back to “OFF” (O).
9. The vehicle should then idle for 15 minutes. With the engine running, shift the transmission through all the gears so the valve body in the transmission is actuated to ensure BG Quick Clean gets to all parts. During this procedure, make sure the brake is fully applied and drive wheels have stopped turning between gear changes to prevent damage to transmission or differential assemblies. After adding BG Quick Clean, the vehicle should not be run more than 30 minutes before performing the transmission fluid exchange.
   NOTE: If the vehicle cannot be placed on a lift, chock the wheels, apply brakes (including parking brake) and carefully shift transmission through the gears several times with engine running at idle speed.
   
   Vehicle is now ready for the transmission fluid exchange.
10. With the engine still running, turn Service Selector (V1) to “SERVICE” (S). The transmission’s own pump along with the diaphragm pump in the machine will begin the exchange immediately by pumping new fluid into the vehicle and extracting used transmission fluid from the vehicle. The used fluid from the vehicle is transferred into the bottom of the Transmission Fluid Tube (T) at the same rate that the new fluid exits the top and returns to the vehicle. This means that the level of fluid in the transmission and components remains the same at all times during the exchange. The fluid level in the transmission does not require monitoring. For best results, the operator should be inside the vehicle shifting the transmission through its gears as in step 9 to ensure that all cleaner and used transmission fluid is purged from the valve body. As the transmission continues to pump used transmission fluid into the Transmission Fluid Tube (T), the Puck moves to the top of the machine to complete the exchange. A preset bypass valve will open after a pressure differential exists between the new and used transmission fluid lines. This will route the incoming fluid around the Transmission Fluid Tube (T) and into the transmission. The exchange is complete when the gauge pressure drops and/or the diaphragm pump sound changes.
    NOTE: The BG TFX contains a diaphragm booster pump that can speed up the exchange on low-pressure, low-flow transmissions. The service can be performed without boost by disconnecting the machine from shop air for the exchange. Shop air is required for the machine’s additive function to work.
11. When the fluid exchange is complete, add 11 oz. (325 mL) of BG ATC Plus, PN 310, or BG CVT Plus, PN 303, to the Additive Funnel (F2). With the engine running, turn the Service Selector (V1) to “ADD” (+). Run the pump for 15 seconds after fluid is drawn in to ensure it makes it to the vehicle.
12. Check the level of transmission fluid in the transmission and adjust accordingly. The BG TFX has the ability to add and remove additional transmission fluid with the vehicle’s engine running. Pour the desired amount of fluid into the Additive Funnel (F2) and turn the Service Selector (V1) to “ADD” (+). Run the pump for approximately 15 seconds after fluid is drawn in to ensure the fluid ends up in the vehicle. Set the Service Selector (V1) to “OFF” (O). To remove fluid, press and hold the Remove Fluid Button (–) on the BG TFX tower until the desired amount is removed into the Excess Fluid Container (X). 
13. Shut off engine and press and hold the Pressure Release (PR) to remove any pressure trapped in the system. Remove adaptors and reconnect transmission fluid lines. Service is complete.