MOUNTING — VIBRATION ISOLATORS
Vibration Isolators
Installation and Adjustment Procedure
1. Place the vibration isolators on the genset support structure. The isolators should be shimmed or grouted to ensure that all of the isolator bases are within 0.25 inch (6 mm) elevation of each other. The surface the isolator bases rest on must also be flat and level. (See Figure 9 to the right.)
2. Loosen the snubber lock nuts so that the top plate of the isolator is free to move vertically and horizontally. Be sure the top plate is correctly aligned with the base and springs.
3. Place the genset onto the isolators while aligning the skid's mounting with the threaded isolator hole. The top plates will move down and approach the base of the isolator as the weight of the generator is applied.
4. Once the genset is in position, the isolators may require adjusting so that the set is level. The isolators are adjusted by inserting the leveling bolt through the skid and into the isolator (the leveling bolt's locking nut should be threaded up towards the bolt head). The leveling bolt will adjust the clearance between the top plate and the isolator base. A nominal clearance of 0.25 inch (6 mm) or greater is desired. This will provide sufficient clearance for the rocking that occurs during
the 0.25 inch clearance is not present, turn the leveling bolt until the desired clearance is achieved.
Set mounted radiator-cooled generator sets:
Figure 9. Vibration Isolator
Make sure radiator skid and engine/alternator skid are level with each other after adjusting isolators. Improper fan belt alignment may occur is the unit is not level.
5.Adjust the leveling bolts until the set is level and sufficient clearance still remains. The clearance on all isolators should be roughly equal. Once all isolators have been set, lock the leveling bolt in place with the lock nut.
6.The snubber nuts must remain loose to provide better isolation between the genset and support structure.
Figure 10. Vibration Isolator Installation
PAGE 36 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)
