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Perkins — How to check the tension of the alternator belt

Maintenance

From a Perkins owner's manual covering: 4000 Series, 4006-23 TAG1A, 4006-23 TAG2A, 4006-23 TAG3A. Check it applies to your exact model before use.

Applies to: Perkins 4006-23 TAG1A, Perkins 4006-23 TAG2A, Perkins 4006-23 TAG3A

Before you start

  • Disconnect the batteries and any other power that can start the engine.

Procedure

  1. Remove the three bolts (A5) from the plate (A6) and remove the plate.
  2. Remove the bolt (A3).
  3. Remove the top bolt (A1) and the bottom bolt (A4) and remove the two parts of the guard (A2).
  4. Apply 15,6 N (3.5 lbf) 1,5 kgf of pressure midway between the two pulleys (B2); correct deflection is 1,5 mm (0.0625 in).
  5. Adjust the belt if necessary.
  6. Fit the guard assembly and tighten all the bolts securely.
  7. Connect the power supply to the starter motor.

Specs & values

  • Deflection 1,5 mm (0.0625 in) at 15,6 N (3.5 lbf) 1,5 kgf

Source: Perkins 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.

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