© Feb. 2023
64 TB20J Plus Maintenance Manual
POWER SYSTEM
• Come off
• Glazed or hardened
If the belt is not properly tensioned, it should be
adjusted:
Press firmly the belt midpoint of the longest extension
between two pulleys, and the proper deflection is 10-
15mm (0.4-0.6in).
Fig 8 Belt deflections
Replace the V-ribbed Belt
It is recommended to replace the V-ribbed belt every 2
years or after 2000 hours of operation.
Fig 9 Engine V-ribbed belt
1. Tensioning pulley
2. Retaining pin
3. Assembly bore
1. Press tensioning pulley with socket wrench in the di-
rection of the arrow until the retaining pin can be
fixed in the assembly bore. The V-ribbed belt is now
tension-free.
2. First pull the V-ribbed belt off the tensioning pulley.
3. Mount new V-ribbed belt.
4. Retain the tensioning pulley using the pin wrench
and remove the retaining pin.
5. Tension the V-ribbed belt using the tensioning pulley
and socket wrench. Check whether the V-ribbed belt
is correctly in its guide.
Replace the V-belt
It is recommended to replace the generator V-belt every
2 years or after 2000 hours of operation.
Fig 10 Generator V-belt
1. Screw
2. Screw
3. Screw
1. Loosen all screws and locking nuts.
2. Move the generator in direction B until the V-belt
slackens.
3. Remove the belt and install a new belt.
4. Move the generator in direction A until the V-belt is
properly tensioned.
5. Check the tension of the V-belt.
6. Tighten all screws and locking nuts again.
Clean the Engine
The following causes of contamination make cleaning
the engine necessary:
• High dust content in the air
• Chaff and chopped straw in the area of the engine
• Coolant leaks
• Lubricating oil leakage
• Fuel leaks
Because of the different application conditions, cleaning
depends on the degree of soiling.
Cleaning with compressed air
Blowing dirt off or out. Always blow the cooler and cool-
ing fins from the exhaust air side to the fresh air side.
Cleaning with cold cleaner
• Spray the engine with cold cleaner and leave it for
about 10 minutes to take effect.
• Spray the engine clean with a high pressure water
jet.
• Warm up the engine so that the water residues
evaporate.
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