Kubota ZD221-48 Workshop Manual page 87

ZD221, WSM ENGINE
(A).
(8)
3EEABAB1 P019B
Fan Belt Damage and Wear
1. Check the fan belt for damage.
2. If the fan belt is damaged, replace it.
3. Check if the fan belt is worn and sunk in the pulley groove.
4. If the fan belt is nearly worn out and deeply sunk in the pulley
groove, replace it.
(A) Good (B) Bad
(A) (8)
MM
3EEABAB1 P018A
A.
CAUTION
• When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down.
Otherwise, hot water may gush out, scalding nearby people.
Radiator Cap Air Leakage
1. Set a radiator tester (1) and an adaptor (2) on the radiator cap.
2. Apply the specified pressure 88 kPa (0.9 kgf/cm
2 ,
13 psi), and
measure the time for the pressure to fall to 59 kPa (0.6 kgf/cm
2 ,
9 psi).
3. If the measurement is less than the factory specification, replace
the radiator cap.
3TAAAAB1 P060A
Pressure falling time Factory spec.
More than 10 seconds
for pressure fall from
88 to 59 kPa (from 0.90 to
0.60 kgflcm
2 ,
from 13 to
8.5 psi)
(1) Radiator Tester (2) Adaptor
Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Set a radiator tester (1) and an adaptor (2) and raise the water
pressure to the specified pressure.
3. Check the radiator for water leaks.
4. If water leaks from the pinhole, repair with the radiator cement.
When water leak is excessive, replace the radiator.
Radiator water leakage
test pressure
Factory spec.
177 kPa
1.8 kgflcm
2
25.7 psi
(1) Radiator Tester
(3) Radiator
(2) Adaptor
1-S15