Cooling System - Kubota B1220 Workshop Manual

B1220, B1620, B1820, WSM

(3) Cooling System

Fan Belt Tension
1. Measure the deflection (A), depressing the belt halfway
between the fan drive pulley and alternator pulley at specified
force 98 N (10 kgf, 22 lbf).
2. If the measurement is not within the factory specifications,
loosen the alternator mounting screws and relocate the
alternator to adjust.
Deflection (A) Factory specification
(A) Deflection
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
Radiator Cap Air Leakage
CAUTION
• When removing the radiator cap, wait at least ten minutes
after the engine has stopped and cooled down. Otherwise,
hot water way gush out, scalding nearby people.
1. Set a radiator tester (1) and adaptor (2) on the radiator cap.
2. Apply the specified pressure 88 kPa (0.90 kgf/cm
measure the time for the pressure to fall to 59 kPa (0.60 kgf/cm
8.5 psi).
3. If the measurement is less than the factory specifications,
replace the radiator cap.
Pressure falling time Factory specification
(1) Radiator Tester
1-S13
ENGINE
7.0 to 9.0 mm
0.28 to 0.35 in.
9Y1210272ENS0017US0
(B) Bad
9Y1210272ENS0018US0
2
, 13 psi), and
More than 10 seconds for
pressure fall from
88 to 59 kPa
(from 0.90 to 0.60 kgf/cm
from 13 to 8.5 psi)
(2) Adaptor
9Y1210272ENS0019US0
KiSC issued 07, 2011 A
2
,
2
,
(EU)