Y-3
Y-3
Air Bleeding Procedure 2. Service brake circuit
3. Swing circuit
[NOTICE]
3.1 Swing motor
The vehicle has two boosters; one for the front wheel brakes and the other for the rear wheel brakes.
[NOTICE] Do not apply any load to the motor before performing air bleeding.
Two air bleeder screws are on the calipers for the front wheel brakes, and two are on those for the rear wheel brakes.
Bleed the swing motor by following either (1), (2) or (3).
Take care of the spill of the brake fluid and the fluid level in the fluid reservoir while bleeding.
1. Pour the hydraulic oil through the drain port into
1. With the sufficient air in the air reservoir, depress
2. Perform the right or left swing operation slowly for
the casing until the oil flows out. approx. one minute.
the brake pedal and loosen the air bleeder screw on the booster.
3. Set the swing brake switch to ON. Perform the right or left swing operation and keep the swing
2. Then tighten the air bleeder screw before
circuit hydraulic pressure at approx. 4.9MPa (710
releasing the brake pedal.
psi) for approx. 30 seconds.
3. Repeat the above steps until the flowing brake
Swing motor
fluid contains no air bubbles. After the air bubbles go out, tighten the air bleeder screw while letting the oil flow out.
Drain port (G 3/8)
IWY05-0130E04
3.2 Swing control back-pressure valve [NOTICE]
4. Bleed the calipers of the axles as the step 1
Conditions Engine speed : Max. PTO : ON Swing brake : ON
above.
1. Open the air-bleed plug and rapidly switch the swing lever repeatedly between swing left and swing right. 2. When there are no more bubbles in the oil that flows out, close the plug while the oil continues to flow.
12
WY05-1110E
