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SERVICE PROCEDURE
BLEED AIR FROM CENTER BRAKE
Stop the machine on level ground and put blocks under the wheels before bleeding the air.
To make it easier to bleed the air, warm the oil up to a temperature of at least 40°C (104°F) before bleeding the air.
Bleed the air from the center brakes in the same way on both the 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 3-75)".
4 - 34
WARNING
MAINTENANCE
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