RELAY ASSEM. 3T0689 - Caterpillar

All Generator Set EnginesVibration limits for all generator set engines have changed. The 4C3030 Vibration Analyzer Group has the new limits programmed in as "Genset-NL". Analyzers can be updated with the new limits by calling Service Technology. The older limits apply to all engines except generator set engines.
Generator Set Vibration Limits
Limits-Production and Field:* 1/2and First Order, 5.0 Mils PK-PK* Overall Displacement, 8.5 Mils PK-PK (0.4 to 8th order)* Overall Velocity, 1.35 in/sec PK (0.4 to 8th order)
Conditions:Full Package RatingRated SpeedAll Mounting Configurations
Measurement Points:The illustration shows the location of the measurement points.
Illustration 1. Location of vibration limits for engine generator set.1. EFV-Engine Front Vertical2. EFH-Engine Front Horizontal3. ERV-Engine Rear Vertical4. ERH-Engine Rear Horizontal5. GRV-Generator Rear Vertical6. GRH-Generator Rear Horizontal7. ERR-Engine Rear Roll (vertical on side of flywheel housing)8. GRA-Generator Rear Axial (at outer diameter of rear generator bearing bracket) 7A is for 3600 Engines.