This instruction show you guide on how to bleed air test for Komatsu excavator.And for more repair manual please refer to:Komatsu CSS Full EPC Set
1. Bleeding air from hydraulic pump
1) Loosen air bleeder (1) and check that oil oozes out through the air bleeder.
2) After the oil oozes out, tighten air bleeder (1).
3 Air bleeder:7.8 – 9.8 Nm {0.8 – 1.0 kgm} a Do not use an impact wrench to tighten the air bleeder
2. Starting engine
When running the engine after performing step 1, keep its speed at low idle for 10 minutes.
3. Bleeding air from cylinder a If a cylinder is replaced, bleed air from it before connecting the work equipment. In particular, the boom cylinder does not move to the lowering stroke end, if it is installed to the work equipment.
1) Run the engine at low idle for about 5 minutes.
2) While running the engine at low idle, raise and lower the boom 4 – 5 times.a Stop the piston rod about 100 mm before each stroke end. Do not relieve the oil.
3) While running the engine at high idle, perform step 2).
4) While running the engine at low idle, move the piston rod to the stroke end and
relieve the oil.
5) Bleed air from the arm cylinder and bucket cylinder according to steps 2) – 4).
Komatsu CSS Full Set 2018 2014 Parts Viwer Free Download
4. Bleeding air from swing motor
1) Turn the swing lock switch "ON" and run
the engine at low idle for 5 minutes.
a Bleed air from the swing motor by
applying the S-port pressure.
2) Remove the swing motor top cover, disconnect hose (1) from the swing motor,
and block the hose with a plug.
a Use the following plug to block the hose. 07379-70628 (Plug #06)
3) Run the engine at low idle and check that oil flows out of elbow (2).
a If no oil flows out of the elbow, perform step 1) again.
4) Connect hose (1) under its normal condition.
5. Bleeding air from travel motor
1) Remove the travel motor cover and disconnect motor drain hose (2).
2) Run the engine at low idle and check that oil flows out of nipple (3)
6. Checking oil level and starting work
1) Run the engine, retract the arm cylinder and bucket cylinder to the stroke ends,
lower the work equipment to the ground,and stop the engine.
2) Check the oil level by sight gauge (4) on the rear side of the hydraulic tank.
-If the oil level is below line L, it is insufficient. Add oil.
-The oil level changes according to the oil temperature. Add oil when the oil level is out of the following standard ranges.
When oil temperature is 10 – 30°C:
Between line H and line L
When oil temperature is 50 – 80°C: Near line H
