HOSE AS 3158420 - Caterpillar

Illustration 1 g03581397
Remove the transmission drain plug. Allow the transmission oil to drain into a suitable container. Clean the transmission drain plug and install the transmission drain plug.
Change the transmission oil filter element. Refer to Operation and Maintenance Manual, "Transmission Oil Filter - Replace".
Illustration 2 g03581398
Remove the transmission breather from the top of the transmission case. Clean the breather in clean nonflammable solvent and allow the breather to dry. Replace the breather.
Illustration 3 g03581399
Remove the dipstick/fill cap and fill the transmission with transmission oil. Refer to Operation and Maintenance Manual, "Lubricant Viscosities", and Operation and Maintenance Manual, "Capacities (Refill)".
Start the engine and run the engine at low idle. Apply the service brake. Slowly operate the transmission controls in order to circulate the oil.
Move the transmission control lever to NEUTRAL and engage the parking brake. Inspect the transmission for leaks.
Maintain the transmission oil level within the crosshatched region on the “CHECK WITH OIL WARM” side of the dipstick when the transmission is warm. Add transmission oil through the transmission filler tube, if necessary. Note: The transmission can be checked with cold transmission oil. Check the oil level with the cold oil check side of the dipstick. The engine must be stopped in order to do a cold oil check. This cold oil level check should be done the machine stayed at overnight.
Install the dipstick/fill cap and install the engine access door.
Stop the engine.