Cab changing procedure of MU locos.

Cab changing procedure in Conventional MU Locos

Driving Cab (of the loco which is to be working as trailing loco):
1. Build up MR pressure to 9.5 kg/cm2.
2. Keep A-9 & SA-9 on application position.
3. Check that BC pressure gauge indicates 3.5 kg/cm2.
4. Apply hand brake/ wooden wedges towards the falling gradient.
5. Do not change the pneumatic COC position.
6. Open DJ, switch off all auxiliary switches, lower pantograph, put MPJ to '0', lock BL, and remove all the keys.
7. Proceed to the other loco.

In the other loco (which is to be working as the leading loco):
1. Apply loco brake through SA-9 and keep A-9 in release position. Then open A-9 and SA-9 supply and apply COCS. Ensure BC gauge is showing 3.5 kg/cm2.
2. Put MU2B on 'LEAD' position and open BP charging COC A-8.
3. Unlock BL, raise pantos, close DJ, start auxiliaries.
4. Proceed to rear loco. Change MU2B to 'TRAIL' position, close A-8 cock, A-9 & SA-9 supply and apply COCs, and keep A-9 & SA-9 in release position.
5. Close the cab doors and windows.
6. Then return to the leading loco. Check the working of A-9 and SA-9.
7. Conduct a loco brake test.
8. Release the hand brake/remove the wooden wedges of the trailing loco.
9. Before moving the loco, conduct a brake power test.