Perkins — How to check the air restriction indicator

Maintenance · Air filter restriction indicator

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

Procedure

1. Observe the middle section of the restriction indicator (A1); it remains clear while the air cleaner is serviceable.
2. When the filter reaches its contamination limit, the middle section (A3) changes to red; at this point the air filter must be changed.
3. After the air filters have been changed, reset the indicators by operating the button (A2).

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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