OM 803 us – Edition 3.7 * 803b520.fm 5-15
Maintenance
5.6 V-belt
Injury hazard when checking the V-belt tension!
Can cause serious injury or death.
• Stop the engine before performing inspection work in the engine compartment
• Raise the lock lever
• Remove the starting key
• Disconnect the battery
• Let the engine cool down
Cracked and stretched V-belts cause engine damage
• Have the V-belt replaced by a Wacker Neuson service center
Check the V-belt once a day, and retighten it if necessary.
Retighten new V-belts after about 15 minutes of running time.
Checking V-belt tension
☞Stop the engine
☞Raise the lock lever
☞Remove the starting key and carry it with you
☞Disconnect the battery
☞Let the engine cool down
☞Open the engine cover
☞Carefully check V-belt 1 for damage, cracks or cuts
➥Replace the V-belt if it touches the base of the V-belt groove or if the pulleys are
damaged.
☞Press with your thumb about 100 N (22.5 lbf) to check the deflection of the V-belt
between the crankshaft disc and the fan wheel. A new V-belt should have a deflection
of 6 to 8 mm (0.24 to 0.31 in), a used V-belt (after about 5 minutes running time)
should have a deflection of 7 to 9 mm (0.27 to 0.35 in) (see figure)
☞Retighten the V-belt if necessary
• If the V-belt is damaged:
☞Have the V-belt replaced by authorized personnel
☞Close and lock the engine cover
Retightening the V-belt
May only be performed by a Wacker Neuson service center.
Fig. 203: Checking V-belt tension
About 8 mm
1
2
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