Cummins/Onan C1250D6E / C1500D6E — Series C4E-1D Cast Iron Spring-Flex Mounting Installation

Installation · Vibration isolators (FES Spring Vibration Isolators, NSBOP34)

For the Cummins/Onan C1250D6E / C1500D6E, from the Cummins/Onan manual.

Applies to: Cummins/Onan C1250D6E, Cummins/Onan C1500D6E, Cummins/Onan QSK38-G18 engine

Procedure

1. Space and arrange isolators per installation drawings; ship fully assembled.
2. Set isolators on floor or sub-base; align centerlines with equipment mounting holes.
3. Shim or grout as required; level all base plates at same elevation (1/4 in max difference).
4. Unless specified, mountings need not be fastened to floor. If required, bolt through slots.
5. Remove adjusting bolt C with nut B from top housing A; do not discard.
6. Place machine onto top plate A; weight lowers upper housing onto lower housing.
7. Align equipment mounting hole to top housing tapped hole.
8. Turn nuts B up on leveling bolts so they will not interfere with leveling.
9. Insert bolts C through machine base holes and hand-screw into tapped hole as far as possible.
10. Adjust each isolator in sequence: screw down one complete turn on adjusting bolt.
11. Adjust until 1/4 in gap is obtained on all mounts.
12. Turn nut on adjusting bolt C down against machine leg and lock with wrench.
13. Installation is complete.

Source: Cummins/Onan manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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