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Tools for this maintenance include the same tools as for L3, and in addition, the
rotor removal equipment. The preparations consist of opening the inspection
covers, and the removal of rotor and exciter, if applicable.
The amount of spare parts required for this level of maintenance is difficult to
determine. At least the recommended spare parts package is recommended, but
spare parts included in the capital spare part package would ensure a fast and
successful execution of this maintenance.
The Level 4 maintenance should be performed after every 80 000 equivalent
operating hour. When a L4 maintenance is conducted it replaces the L1, L2 or L3
maintenance otherwise scheduled, and it leaves their rotation unaffected, see
Table 7-1. Recommended maintenance program
.
7.3.1 Recommended maintenance program
Abbreviation used in maintenance program:
•
V
=visual checking
•
C
=cleaning
•
D
=disassembling and assembling
•
R
=reconditioning or replacement
•
T
=testing and measurement
NOTE: Not all options are applicable for all machines.
Table 7-2. Maintenance intervals.
Maintenance interval
In equivalent operating hours or time period,
which ever comes first
Maintenance
object
L1
L2
L3
L4
Check/test
4000
8000
24000
80000
0,5 year
Annual
3–5 years
Overhaul
Table 7-3. Maintenance objects for general construction.
Maintenance
object
L1
L2
L3
L4
Check / Test
Machine operation
V/T
V/T
V/T
V/T
Starting, shut down,
vibration measurement,
no-load point
Mounting and
foundation
V
V/T
V/T
V/T/D Cracks, rust, alignment
Exterior
V
V
V
V
Rust, leakage, condition
Fastenings
V
V/T
V/T
V/T
Tightness of all fastenings
