Table of Contents
Advertisement
MAINTENANCE
BLEEDING AIR FROM HYDRAULIC SYSTEM
For details of the procedure when starting the engine, see "STARTING ENGINE (PAGE 3-98)". If necessary, refer
to the OPERATION volume for the sections for starting the engine, moving the machine off, steering, and stopping.
When starting the engine to bleed the air, cancel the automatic warming-up operation before starting.
Method of canceling automatic warming-up operation
1. Turn the starting switch ON.
2. Hold the fuel control dial at the MAX position for 3 seconds.
3. Turn the fuel control dial to the MIN position.
4. Start the engine.
NOTICE
Bleed the air as follows.
1. Pump (work equipment, swing) (Bleed the air without starting the engine)
2. Work equipment circuit
Bleed the air from the pump with the engine stopped.
Run the engine at the speed of 1000 rpm or below and operate the cylinders slowly.
Do not carry out the operation suddenly, or raise the cylinder pressure, or operate the cylinder to the end of its stroke.
When operating the cylinder for the first stroke (extending and retracting), operate particularly slowly.
When operating the cylinder for the first stroke, there is a large amount of air inside the circuit, so the work equipment will not
move for at least 10 seconds. Be careful not to operate the lever to the end of the stroke.
Use clean oil of NAS7 class or above when filling the pump. Be sure to use a clean oil can.
Bleed the air from the various components in the order below (1.-6.).
1. Bleeding air from pump (Do this before starting the engine)
1) Loosen air bleed plug (1) and check that oil (4) oozes out
from the air bleeder (3).
CAUTION
MAINTENANCE PROCEDURE
4 - 37
Advertisement
Chapters
Table of Contents
