We are facing a problem with the GE Frame-5 Gas turbine on ratcheting system. When the ratchet starts, it runs every three minutes without an alarm, but on the third cycle, the ending time, the ratchet clutch is disengaging and reengaging frequently. The following have been checked.
Thanks & Regards,
Selvalagan. A
- We checked the hydraulic pressure and found it to be low, with a maximum of 32 bar. Then suspected a pump issue, so we replaced it with a new one. We started it again, but the hydraulic pressure was still low.
- We then checked the DC motor and replaced it with new one, We started it again but the hydraulic pressure still low with a maximum of 32 bar.
- 20CS: Clutch solenoid valve checked (coil, tested, supply is ok 120vdc) and found normal.
- The clutch piston was working normally (if the 4-way valve was operated, it was found to engage and disengage normally).
- The hydraulic line filter was checked and replaced, and found to be normal.
- We inspected all fittings and found no physical leakage.
- During the Ratcheting Sequence, there were no alarms, and 33HR, 33CS were checked and working normally.
- During Forward stroke end, the 33HR is working normal and it checked contacts
- Sequence valve is working normal because there is no alarm. Physically shaft is rotating.
- I noticed that while the Ratcheting Shaft should always be engaged with the Turbine shaft, during the sequence the ratcheting was pushing forward to the Turbine shaft, but the Turbine shaft was moving quickly and the ratcheting shaft was coming slowly, So it makes a small space, after sequence stopping time, then shaft is disengaged.
- But only one problem during ratcheting time the shaft is disengage and engage.
- We suspected ratcheting system some internal passing oil and it not building pressure, I don't know where is passing oil. Kindly give some ideas to rectify the issue.
Thanks & Regards,
Selvalagan. A