5. Measure the AC voltage across the low voltage
terminals of the transformer that correspond to the
following generator terminals: “T1” and “T2” , “T2”
and “T3” and “T3” and “T1” . Record the voltages.
6. Monitor the voltage between any two of the
locations in step 5. Decrease the generator set
speed by 10%. Increase the generator set speed
by 10%.
7. The voltages that were measured in Step 5 should
be nearly equal. These voltages should measure a
minimum of 85 VAC.
8. When the generator set speed is decreased by
10%, the voltages that were measured in Step 6
should decrease by 10%. When the generator set
speed is increased by 10%, the voltages that were
measured in Step 6 should increase by 10% .
i01228545
Generator Set Vibration -
Inspect
SMCS Code: 4450-040-VI
Check for vibration damage. Vibration may cause the
following problems:
• loose fittings
• loose bolts
• excessive noise
• cracked insulation
The following areas are susceptible to vibration
damage:
• stator output leads
• protective sleeving
• insulation
• exposed electrical connections
• transformers
• fuses
• capacitors
• lightning arrestors
Check the generator set's vibration level by using a
broad spectrum analyzer.
i06104329
Hoses and Clamps - Inspect/
Replace
SMCS Code: 7554-040; 7554-510
Hoses and clamps must be inspected periodically
and replaced at the recommended interval to ensure
safe and continuous operation of the engine. Failure
to replace a fuel hose at the recommended change
interval may result in a hazardous situation. Take
proper safety precautions before inspecting or
replacing hoses and clamps.
Note: Always use a board or cardboard when the
engine components are checked for leaks. Leaking
fluid that is under pressure can cause serious injury
or possible death. Leaks that are the size of a pin
hole are included. Refer to Operation and
Maintenance Manual, “General Hazard Information”
for more information.
Note: Ensure that the hose is compatible with the
application.
Inspect the Hoses and the Clamps
Inspect all hoses for leaks that are caused by the
following conditions. Replace any hose which
exhibits any of the following conditions. Failure to
replace a hose which exhibits any of the following
conditions may result in a hazardous situation.
• Hoses which are cracked
• Hoses which are soft
• Outer covering that is chafed or cut
• Exposed wire that is used for reinforcement
• Outer covering that is ballooning locally
• Flexible part of the hose that is kinked or crushed
• Armoring that is embedded in the outer covering
• Hoses which exhibit signs of leakage which are
not the result of loose couplings or clamps
Inspect all clamps for the following conditions.
Replace any clamp which exhibits signs of any of the
following conditions.
• Cracking
• Looseness
• Damage
Inspect all couplings for leaks. Replace any coupling
which exhibits signs of leaks.
138
SEBU7125-13
Maintenance Section
Generator Set Vibration - Inspect
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