Specifications

Alternator Direct Coupling Device (Lovejoy #LF4 Coupler)

The alternator is coupled to the genset engine via a flexible torsional coupling (Lovejoy

#LF4). The coupling is installed prior to shipping and should require no user adjustment

thereafter.

Should you need to remove and replace the alternator and coupling, re-installation will

require strict adherence to the following procedural guidelines:

1. Inspect all contact surfaces on the Lovejoy coupler (bare metal surfaces on the

rubber coupling unit) for oil, dirt or other contaminants. Clean those surfaces

thoroughly with a medium grit sandpaper and wipe clean. Clean flex ring adapter

(metal ring attached to the engine flywheel) and pulley flange as well.

2. The Lovejoy is connected to the flex ring adapter under compression. When

installing the Lovejoy coupling you will find that the threaded holes on the flex ring

will not necessarily align with the Lovejoy without some manipulation of the

coupling.

3. Attach the Lovejoy to the

flex ring with a single

25mm capscrew. Turn the

capscrew a couple of

rotations -- just enough to

ensure proper threading.

4. One-by-one, insert the

remaining capscrews and

turn just enough to ensure proper threading. It may be necessary to compress the

Lovejoy to align with the threaded holes on the flex ring. Once all of the capscrews

have been started, each can be tightened to 20 ft.lb. Inspect coupling attachment

for proper alignment, as shown in illustration above.

Alternator Attachment

1. Ensure that the aligning capscrew is attached to the center bore on the tensioning

crown of the alternator. Align alternator so the flange in the pulley assembly fits

evenly inside the center hole in the Lovejoy coupling and the head of the aligning

capscrew fits in the indexing hole in the alternator bracket.

2. Once aligned, insert the

/8” hex bolts in the two remaining holes in the alternator

tensioning crown (on either side of the indexing screw). These bolts will thread

into the alternator bracket. There may be some play in the bore containing the hex

bolts. Don’t be concerned. The head of the indexing capscrew will ensure proper

alignment.

3. Insert the

/2” hex bolt at the remaining alternator foot and thread into the

alternator bracket. Torque the alternator retaining bolts to 38 ft.lb.

4 Insert the Nordlock (locking washers) into the radial cavities of the Lovejoy

coupling. (Inserting the washer at an angle to the coupling makes it easier to

insert the washers).

5. Align the screw holes of the Lovejoy with the threaded holes in the pulley by

turning the alternator fan.

Shows correct and incorrect axial coupling alignment.

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