Kubota — Checking and Adjusting Drive Belt Tension
Adjustments · Alternator drive belt
From a Kubota service manual covering: Hurth HBW 100, Hurth HBW 125, Hurth HBW 150, Hurth HBW 250, Hurth HBW 35, Hurth HBW 50, M-25XPB, M-35B, M-40B. Check it applies to your exact model before use.
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Before you start
- Never attempt to check or adjust the drive belt's tension while the engine is in operation.
Procedure
- Press belt midway between alternator and crankshaft pulleys with 22 lbs (10 kgf).
- Belt deflection should be 3/8 - 1/2 in. (10 - 12 mm) deep.
- Loosen the alternator adjusting strap bolt and the base mounting bolt.
- Inspect belt for damage, wear, cracks and frayed edges; replace if damaged.
- Pivot the alternator left or right to loosen or tighten.
- Tighten the base mounting bolt and the adjusting strap bolt securely.
- Run the engine about 5 minutes, shut down, and recheck belt tension.
Specs & values
- Belt deflection 3/8 - 1/2 in. (10 - 12 mm)
Source: Kubota service 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.