2·2 By·pass Valve; Oil Switch - Kubota D650-B Handbuch

[A] Relief valve and by-pass valve
(3)
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2·1 RELIEF VALVE
Relief valve prevents damage to the lubrication system due
to high oil pressure_ Control range of the relief valve is
196 to 441 KPa (2.0 to 4.5kgf/cm
2
,
28 to 64psil. When oil
pressure exceeds the upper limit, the ball is pushed back by
high pressure oil and the oil escapes.
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2·2 BY·PASS VALVE
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Oil filter cartridge has a by-pass valve inside, to prevent the
lack of lubrication oil in the engine, if the oil filter element is
clogged. When the pressure difference before filtering and
after is more than 98.1kPa (1.0kgf/cm
2
,
14.2psi), the by-pass
valve opens and lets the oil,pass to each part of engine with­
out passing through the filter.
(1)
(21
131
(4)
(51
Relief valve
By-pass valve
From pump
To rocker arm shaft and camshaft
To crankshaft
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(7)
(81
2-3 OIL SWITCH
[AI Oil $Witch
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Oil switch is provided on the way for the oil pressure. If the
oil pressure is proper, it is switched off, if oil pressure falls
below 49.0kPa (O.5kgf/cm
2
,
7.1psi), the oil warning lamp
etc. will light, warning the operater. In this case, stop the
engine immediately and check the cause of the pressure drop.
111 When oil pressure is proper
(2) When oil pressure falls
(31 Screw
(41
Terminal
(51 Spring plate
(61
Insulator
(7) Spring retainer
(SI Rubber packing
(91 Oil seat
(101
Contact rivet
(111 Contact
(121
Lamp
(131
Battery
54