Kubota BX1880, BX2380, BX2680 Fan Belt Adjustment

BX1880 / BX2380 / BX2680 Owner Service Guide

The fan belt drives the cooling fan and the alternator from the crankshaft. Check the tension and condition every 100 hours. A loose or stretched belt slips, which can cause the engine to overheat and the battery to run down.

Specification

Checking the tension

1. Park on level ground, set the parking brake, stop the engine and remove the key.
2. Open the hood.
3. Press on the belt with your thumb halfway between the fan drive pulley and the alternator pulley.
4. Measure how far the belt moves. It must deflect 7 to 9 mm (0.28 to 0.35 in.).

Adjusting the tension

1. Loosen the alternator mounting bolts.
2. Place a pry bar between the alternator and the engine block. Pull the alternator outward until the belt deflection is within 7 to 9 mm (0.28 to 0.35 in.).
3. Hold the alternator in position and tighten the mounting bolts.
4. Recheck the deflection.

Inspecting the belt

Replace the belt if it is cracked, frayed or otherwise damaged. Also look at how the belt sits in the pulley groove. A good belt rides with its top near the top of the groove. A belt that is worn thin sinks deep into the groove and can no longer be tensioned correctly; replace it.

Replacing the belt

1. Loosen the alternator mounting bolts and push the alternator toward the engine to slacken the belt.
2. Remove the old belt from the pulleys.
3. Fit the new belt into the grooves of all the pulleys.
4. Set the tension as described above and tighten the mounting bolts.

Parts

Parts catalogs: BX1880, BX2380, BX2680.

Related

• Battery check
• Cooling system flush and coolant change
• Hose and line inspection
• BX Owner Service Guide

To have the service done at Messick's, schedule service.