Lubricating System; Cooling System - Kubota WSM ZD321 Workshop Manual

ZD321, ZD326, ZD331, WSM

(2) Lubricating System

(3) Cooling System

Engine Oil Pressure
1. Remove the engine oil pressure switch, and set an oil pressure
tester.
2. Start the engine. After warming up, measure the oil pressure of
both idling and rated speeds.
3. If the oil pressure is less than the allowable limit, check the
following.
• Engine oil insufficient
• Oil pump defective
• Oil strainer clogged
• Oil filter cartridge clogged
• Oil gallery clogged
• Excessive oil clearance
• Foreign matter in the relief valve
At idle
speed
Engine oil pressure
At rated
speed
(When reassembling)
• After checking the engine oil pressure, tighten the engine oil
pressure switch to the specified torque.
Tightening torque Oil pressure switch
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 spec.
(A) Deflection
1-S22
More than 49 kPa
Factory
0.50 kgf/cm
spec.
7.1 psi
197 to 441 kPa
Factory
2.00 to 4.50 kgf/cm
spec.
28.5 to 64.0 psi
147 kPa
Allowable
2
1.50 kgf/cm
limit
21.3 psi
15 to 19 N·m
1.5 to 2.0 kgf·m
11 to 14 lbf·ft
W10349520
7.0 to 9.0 mm
0.28 to 0.35 in.
W10356670
ENGINE
2
2
KiSC issued 04, 2007 A