Bleeding The Braking Circuit - Komatsu WB93S-5 F50003 Operation & Maintenance Manual

4.8.1.h

BLEEDING THE BRAKING CIRCUIT

Oil spilled on the floor may cause the floor to become
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slippery; immediately clean any dirty area.
The braking system must be bled with the machine
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positioned on level ground, the loader arm completely
lowered, the backhoe boom in transport position and the
parking brake applied.
Oils, filters, the coolant and the battery are considered
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special waste and must be collected and disposed of
according to the regulations in force.
This operation is important, since it ensures the braking efficiency
and power of the machine. Proceed as follows:
1 - Disconnect the brake pedals, so that they are independent of
each other.
2 - Apply a small pipe for the collection of the oil to the drain
screws (1).
3 - Remove the front guard (2) and the cap (3) from the reservoir
(4).
4 - Make sure that the oil in the braking system reaches the
maximum level.
5 - Press the left brake pedal thoroughly and, keeping it pressed,
loosen the drain screw (1) of the corresponding brake until
the pedal reaches the end of stroke. Use a 13 mm wrench.
6 - While keeping the pedal completely pressed, tighten the
drain screw (1).
7 - Release the brake pedal, wait a few seconds and repeat the
operations described above until no air bubbles can be
noticed in the oil that flows out of the drain screw (1).
8 - Carry out the same operations for the right pedal.
9 - After bleeding the circuit, start the machine and check the
braking efficiency; if necessary, bleed the circuit again.
10 - Put back the front guard (2).
IMPORTANTE
When bleeding the system, apply a small pipe to the
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screws (1), in order to collect the oil.
The bleeding procedure must be carried out for both
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braking units, disconnecting the pedals from each other.
Frequently check the oil level in the braking system and
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top up whenever the oil is near the minimum level.
To top up, use only new oil of the prescribed type.
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AVVERTENZA
MAINTENANCE PROCEDURES
1 1
2
3
4
RWAA9090
RKAB3770
RKAB3750
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