Generac MFH500 — Checking Alternator Drive Belt
Maintenance
For the Generac MFH500, from the Generac owner's manual.
Applies to: Generac MFH500, Isuzu 4JJ1TT4 engine
Parts for this job
Part numbers from the service-parts lists for Generac MFH500, Isuzu 4JJ1TT4 engine. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Verify that the engine is stopped and cannot be operated.
- Apply 22 lb (98 N) thumb pressure at the midway point between the alternator pulley and the idler pulley.
- Read the belt tension.
- Replace the alternator drive belt if it is out of spec or damaged; replace belts as a set.
Specs & values
- New belt slack: 0.2–0.24 in (5.1–6.1 mm)
- Used belt slack: 0.28–0.31 in (7.1–7.9 mm)
Full service-parts list: Generac MFH500 →, Isuzu 4JJ1TT4 engine →
Source: Generac 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.