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Home›Repair guides›Cummins/Onan›Adjusting V-Belt Tension

Cummins/Onan A052J727 — Adjusting V-Belt Tension

Adjustments

For the Cummins/Onan A052J727, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan MDKD

Before you start

  • Accidental or remote starting can cause severe personal injury or death.

Parts for this job

Part numbers from the service-parts list for Cummins/Onan MDKD. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. Disconnect the negative battery cable.
  2. Remove the belt guard or enclosure top panel and access doors.
  3. Loosen the alternator pivot bolt, then the adjusting bracket bolt.
  4. Pivot the alternator out to tighten the belt.
  5. Check tension by applying 10 kg (20 pounds) to the middle of the pulley span.
  6. Tighten the alternator bolts, secure the guard, and reconnect the battery.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Belt deflection 10 mm (3/8 inch) with 10 kg (20 pounds) applied

Full service-parts list: Cummins/Onan MDKD →

Source: Cummins/Onan operator'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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