How to Test Oil Leakage for Komatsu Hydraulic Excavator PC130

This is a instruction on how to do oil leakage test for Komatsu hydraulic excavator PC130.If you need more information please go to:Komatsu CSS Full Set 2018 2014 Parts Viwer Free Download

 

Test the oil leakage under the following condition.
Hydraulic oil temperature: Within operating range

 

1.Testing oil leakage from boom cylinder
1) Move the boom cylinder to the RAISE stroke end and stop the engine.
Release the residual pressure from the piping on the boom cylinder head side. For details, see “Releasing residual pressure from hydraulic circuit” (Operate the lever in the boom RAISE direction only, however).
2) Disconnect hose (1) on the cylinder head side and block it with a plug.
Take care not to disconnect the hose on the cylinder bottom side.
Use the following part to block the hose side

3)Run the engine at high idle and relieve the boom circuit by raising the boom.
Take care not to “lower the boom”.
4) Start testing the oil leakage 30 seconds after relieving is started and test for 1
5) After finishing test, return the removed parts.

 

2.Testing oil leakage from arm cylinder
1) Move the arm cylinder to the IN stroke end and stop the engine.
Release the residual pressure from the piping on the arm cylinder head side. For details, see Releasing residual pressure from hydraulic circuit (Operate the lever in the arm IN direction only, however).
2) Disconnect hose (2) on the cylinder head side and block it with a plug.
Take care not to disconnect the hose on the cylinder bottom side.
Use the following part to block the hose side

3)Run the engine at high idle and relieve thearm circuit by moving the arm IN.
Take care not to “move the arm OUT”.
4) Start testing the oil leakage 30 seconds after relieving is started and test for 1
5) After finishing test, return the removed parts.

 

3.Testing oil leakage from bucket cylinder
1)Move the bucket cylinder to the CURL stroke end and stop the engine.
Release the residual pressure from the piping on the bucket cylinder head side. For details, see Releasing residual pressure from hydraulic circuit (Operate the lever in the bucket CURL direction only, however).
2)Disconnect hose (3) on the cylinder head side and block it with a plug.
Take care not to disconnect the hose on the cylinder bottom side.
Use the following part to block the hose side.

3)Run the engine at high idle and relieve the bucket circuit by curling the bucket.
Take care not to “dump the bucket”.
4)Start testing the oil leakage 30 seconds after relieving is started and test for 1 minute.
5)After finishing test, return the removed parts.

 

 

4.Testing oil leakage from swing motor
1)Disconnect 2 drain hoses (4) and block the hose side with plugs.
Use the following parts to block the hose side.

2)Turn the swing lock switch ON.
3)Run the engine at high idle and relieve the swing circuit by swinging.
Start testing the oil leakage 30 seconds after relieving is started and test for 1 minute.
After testing 1 time, swing 180°, and then test again.
4)After finishing test, return the removed parts.

 

 

5Testing oil leakage from travel motor
1)Remove the travel motor cover.
2)Run the engine, lock the travel mechanism, and stop the engine.
Put pin [1] between the sprocket and track frame to lock the travel mechanism securely.

3)Disconnect drain hose (5) of the travel motor and block the hose side with a plug.
Use the following part to block the hose side.

Run the engine at high idle, relieve the travel circuit, and test the oil leakage.
Before operating the travel lever,check the position and locking direction of the locked sprocket
again.
Wrong operation of the lever can cause an accident. Accordingly,
make signs and checks securely.
Start testing the oil leakage 30 seconds after relieving is started and test for 1 minute.
Test several times, moving the motor a little (changing the position of the valve plate and cylinder and that of the cylinder and piston) each time.

4)After finishing test, return the removed parts.

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