. MAINTENANCE SERVICE PROCEDURE BLEED AIR FROM CENTER BRAKE WARNING 4 - 33 Stop the machine on level gro und and put blocks under the wh eels before To make it easier to bleed the air, warm the oil up to a te mperature of at least 40°C (104°F) be fore bleeding the air. Bleed the air from the cent er brakes in the same way on both t he left and right sides. 1. Start the engine, check that the oil in the transmission case is the specified level, and check if the retarder oil pressure caution lamp is out. 2. Remove the cap installed to bleeder screw (1) of the slack adjuster, then insert a vinyl hose. Prepare a container with oil in it and insert the other end of the hose approx.
50 mm (2.0 in) below the surface of the oil. (Use any commercially available vinyl hose.) 3. Depress the brake pedal and loosen bleeder screw (1) approx. 3/4 turns. Keep the pedal depressed until no more bubbles come out from the vinyl hose. 4. Pull the retarder control lever and loosen bleeder screw (1) approx. 3/4 turns. Keep the retarder control lever depressed until no more bubbles come out from the vinyl hose. 5. After bleeding the air, tighten bleeder screw (1) securely and fit the cap. 6. The procedure for bleeder screw (2) of the center brake is the same as for the slack adjuster (with Step 4 excluded). NOTICE The brake oil pressure caution lamp may light on during air bleeding.
In that case, tighten the bleeder screw and check sight gauge (H) to see if some oil remains in the brake oil tank. If there is no oil left, stop the engine and fill with oil. (When the engine stops, the oil level rises and the brake oil tank is automatically refilled with oil.) 7. After finishing air bleeding, stop the engine (for 2 to 3 minutes), and adjust the oil level so that it reaches the specified level. For details, see "CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL (PAGE 3-74)". 1. Start the engine, chec k that the oil in the transmissio n cas e is the specified level, and ch eck if the retarder oil th oil in it and insert the other e nd of t he 2.0 in) below the surface of the 3.
Depress the brake ped al and loosen bleeder screw (1 ) approx. edal depressed until no more bubbles l hose. ol lever and loosen bleeder screw (1) ep the retarder control lever depressed (1) epressed come out from the vinyl hose. 5. After bleeding the air, ti ghten bleeder screw (1) secur ely and fit 6. The procedure for blee der screw (2) of the center bra ke is t he adjuster (with Step 4 excluded 7. After finishing air bleed ing, stop the engine (for 2 to 3 minutes), so that it reaches the specified level. F or IL LEVEL IN TRANSMISSIO N CASE,