Cooling System - Kubota WSM J Series Workshop Manual

J SERIES, WSM

[3] COOLING SYSTEM

(1) Checking and Adjusting
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.
Fan Belt Tension
1. Measure the deflection (A), depressing the belt halfway between
the fan drive pulley and alternator at specified force (98 N, 10 kgf,
22 lbs).
2. If the measurement is not within the factory specifications, loosen
the alternator mounting screws and relocate the alternator to
adjust.
Deflection (A) Factory spec.
Fan Belt Damage and Wear
1. Check the fan belt for damaged.
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
1. Set a radiator tester (Code No. 07909-31551) and an adapter
(BANZAI Code No.RCT-2A-30S) on the radiator cap.
2. Apply the specified pressure (88 kPa, 0.9 kgf/cm
measure the time for the pressure to fall to 59 kPa (0.6 kgf/cm
9 psi).
3. If the measurement is less than the factory specification, replace
the radiator cap.
Pressure falling time Factory spec.
Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Set a radiator tester (Code No. 07909-31551) with an adapter
(BANZAI Code No.RCT-2A-30S) and raise the water pressure to
the specified pressure.
3. Check the radiator for water leaks.
4. For water leak from the pinhole, replace the radiator or repair with
the radiator cement. When water leak is excessive, replace the
radiator.
Radiator water leakage
Factory spec.
test pressure
S-103
ENGINE
7.0 to 9.0 mm
0.28 to 0.35in.
W10384280
(B) Bad
W10385490
2
, 13 psi), and
More than 10 seconds
for pressure fall from
88 to 59 kPa
(from 0.9 to 0.6 kgf/cm
from 13 to 9 psi)
W10387530
137 kPa
2
1.4 kgf/cm
20 psi
W10389070
KiSC issued 10, 2016 A
2
,
2
,