Bleed Air From Front Brake - Komatsu ecot3 GALEO HM300-2 Operation And Maintenance Manual

SERVICE PROCEDURE

BLEED AIR FROM FRONT 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 front 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 front 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 depress the brake pedal 8 to 10
times to charge pressure to the accumulator.
In addition, 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 add 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)".
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WARNING
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