Introduction to the main pump oil port of Komatsu excavator
Posted on 26/11/2023
Front pump end oil port
| Number | Oil port name |
|---|---|
| 1 | From PC-EPC to front pump PC valve |
| 2 | From the rear pump pressure goes to the small end of the servo piston as the front pump PC valve to the other pump pressure |
| 3 | From front pump pressure to front pump servo piston small end and LS valve |
| 4 | From LS-EPC to rear pump LS valve |
| 5 | From self-pressure reducing valve |
| 6 | From front pump pressure to lubricate the bearings |
Oil port at the front pump side of the middle pump body
| Number | Oil port name |
|---|---|
| 1 | From PC-EPC to front pump PC valve |
| 2 | From the rear pump pressure to the front pump servo piston small end as the front pump PC valve another pump pressure |
| 3 | From front pump pressure to front pump servo piston small end and LS valve |
| 4 | From LS-EPC to rear pump LS valve |
| 5 | From self-pressure reducing valve |
| 6 | PC-EPC oil return port |
| 7 | From front pump pressure to lubricate the bearings |
| 8 | Connect the front and rear pump internal drain chambers |
Oil port at the rear pump side of the middle pump body
| Number | Oil port name |
|---|---|
| 1 | From LS-EPC to rear pump LS valve |
| 2 | From PC-EPC to back pump PC valve |
| 3 | From the front pump pressure, remove the small end of the rear pump servo piston as the PC valve and use the other pump pressure |
| 4 | From the rear pump pressure remove the rear pump servo piston small end and LS valve |
| 5 | From rear pump pressure to lubricate the bearings |
| 6 | From front pump pressure to lubricate the bearings |
Rear pump end oil port
| Number | Oil port name |
|---|---|
| 1 | From the rear pump pressure to the small end of the servo piston |
| 2 | From PC-EPC to back pump PC valve |
| 3 | From LS-EPC to rear pump LS valve |
| 4 | From the rear pump pressure remove the rear pump servo piston small end and LS valve |
| 5 | From rear pump pressure to lubricate the bearings |
