Northern Lights — Checking the Crankshaft Vibration Damper (6-Cylinder Engine Only)
Maintenance
From a Northern Lights owner's manual covering: NL445D, NL445D1, NL445T1, NL445T2, NL668T2. Check it applies to your exact model before use.
Applies to: Northern Lights NL445D1, Northern Lights NL445T1, Northern Lights NL445T2, Northern Lights NL668T2, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine
Procedure
- Run the engine to operating temperature and stop; remove the belts.
- Grasp the vibration damper with both hands and attempt to turn it in both directions; if rotation is felt, the damper is defective and should be replaced.
- Position a dial indicator so the probe contacts the damper outer diameter.
- With the engine at operating temperature, rotate the crankshaft using a flywheel turning tool and note the indicator reading.
- Replace the damper if runout exceeds 1.50 mm (0.060 in).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Damper radial runout maximum 1.50 mm (0.060 in)
- Replace damper assembly every 4500 hours or 60 months
Full service-parts list: Northern Lights NL445D1 →, Northern Lights NL445T1 →, Northern Lights NL445T2 →, Northern Lights NL668T2 →, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine →
Source: Northern Lights owner's 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.