Disassembly Procedures (Major Inspection); Perform Alignment Checks Before Any Unit Disassembly Is Begun - GE MS-6001B Maintenance Instructions Manual

Inspection and Maintenance — GEK 107048
I. Disassembly Procedures (Major Inspection)
For MS-6001B DLN-1 Equipped Machines
Operation 1 — Perform Alignment Checks Before Any Unit Disassembly is Begun
Note: It is suggested that assistance be obtained from your General Electric
Company Field Service Representative when performing alignment
checks.
1. Remove the load coupling guard and screen.
2. Remove the accessory coupling guard bottom cover. Remove the bolting from the accessory gear
end of the guard and the two top bolts which connect the guard to the turbine end coupling guard
section. Lift this section off.
3. Remove the bolting from the turbine end of the coupling guard and lift off this section.
4. Bag all removed hardware and identify for reassembly.
5. Check turbine to load gear alignment.
Note: Use the hydraulic ratchet to rotate the unit for turbine to load gear
alignment checks. Indicate both face and rim readings on the station-
ary load gear rotor.
a. Check alignment of turbine to load gear at the load gear end of the load coupling. This allows
an alignment procedure which is identical to the one employed during installation. The turbine
to load gear coupling must be unbolted and jacked apart. Matchmark load coupling prior to
unbolting and jacking apart.
Note: The output coupling is accessible for removal and replacement during
major inspection since the exhaust frame is disassembled, however spe-
cial fixturing (tooling) is provided to remove and replace the output
coupling and to disassemble and assemble the number 2 bearing with
the exhaust frame in place.
b. Position a dial indicator for a vertical reading on the O.D. of the load coupling every 45 . Ro-
tate turbine rotor and record coupling runout on Inspection Form PGS/GT-FF-6114. Refer to
the Basic Alignment Instruction (Field) in the Reference Drawing section of this Service Man-
ual for tolerances.
CAUTION
All upper half casings must be installed and the turbine
supported on its own support mounts prior to checking
alignment.
Major Inspection — Disassembly Procedures
MI-D-1