Lubrication System; Cooling System - Kubota D1102-B Workshop Manual

(A) Lubrication System
(a)
0073F017
(a) Oil filter
(b) Oil pump
(c) Pressure regulating valve
(d) By-pass valve
(e) Filter element
(f) Crankshaft
(g) Piston
(h) Idle gear
(A) Cooling System
(g)
(a)
(b)
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(a) Radiator (f) Cylinder head
(b) Radiator core (g) Water pipe
(c) Suction fan (h) Thermostat
(d) Water pump (i) By-pass
(e) Cyl i nder block
(i)
Im)
(o)
(i) Rocker arm shaft
(j)
Rocker-arm
{k) Push rod
(I) Tappet
(m) Oil pressure switch
(n) Camshaft
(o) Oil pan
The l u brication system consists of a trochoide rotor-type
driven oil pu mp, oil filter cartridge, oil pressure regulati ng
valve, oil switch a nd oi l filter.
Oil is sucked by the oil pu mp (b) from the oi l pa n (o) through
the oil f ilter (a) , a nd the oi l is kept at 294 to 441 kPa (3.0 to
2
4.5 kgf/cm 42 to 64 psi) by a n oil pressure regulati ng va lve
,
(c) i nstalled i n the gear case. Then oi l flows towards the f i lter
ca rtridge where it wil l be f u rther f i ltered - To ensure the
suppl y ing of l u bricated oil, a by-pass valve (d) is prov ided,
the va lve opens when the f i lter element (e) is restr icted -.
From the f ilter cartridge, the pressured oil is then d istributed
i nto two parts: one pa rt wil l be f ed through cra nkshaf t
passage to the crank pi n bea ri ng a nd the other to the rocker
arm shaf t ( i) th rough the frame. Oi l then returns to oil pa n
by force of gravity.
A n oil pressure switch ( m) is provided on the way for watch-
i ng the oil pressure drop. The oil pressure switch can be con-
nected to the termi nals of the warni ng lamp on the hour-
meter u nit (optional part), the l ight wil l be l ight for warni ng
the operator if the oi l pressure drops below 50 kPa (0.5
2
kgf /cm 7 .1 psi) .
,
If the warn i ng la mp rema ins l ight wh i le engine is at normal
operation, stop the engine im med iately a nd check
pressure.
The cool i ng system consists of a rad iator (optional part),
centrif uga l water pu mp, suction fa n and thermostat.
The water flow is cooled th rough the rad iator core ( b) a nd
the fa n (c) set beh i nd the rad iator (a) pul ls cool i ng air
through the core to i mprove cool i ng.
The pump (d) sucks the cooled water, forces it i nto the
cy l i nder block (e) and draws out the hot water. Then the
cool i ng is repeated. F urthermore, to control tem perature of
water, a thermostat ( h) is provided on the way. When the
thermostat opens, t he water moves d i rectl y to rad iator, but
when it closes, the water moves toward the water pum p
th rough the by-pass ( i ) between thermostat and water pu mp.
The opening temperature of thermostat is about
(176.3°F).
18
the oil
82°C
KiSC issued 09, 2007 A