Komatsu PC210-8, Руководство по ремонту

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10 Structure, function and maintenance standard UEN00104-00
PC210, 230, 240-8
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1. Assembly
Greasing system generally consists of the following components (see figure 1):
1. Electrically-driven plunger-pump with grease reservoir
2. Control unit (integrated in the pump housing)
3. Distribution blocks
4. Metering units
5. Secondary grease lines
6. Grease pressure switch
7. Primary grease line A
8. Primary grease line B
2. Components
(a) The Grease Pump
The relief valve
A relief valve is mounted in the grease line between the plunger-pump and the diverter-valves. When the
grease pressure exceeds 250 bar during the pumping phase, the relief valve will redirect the grease to the
reservoir.
The maximum grease pressure will be exceeded when:
q
a malfunction of the grease pressure switch, which is mounted in the system occurs;
q
a malfunction in the cable of the grease pressure switch occurs.
The grease pressure switch is intended to end the pumping phase, as soon as the minimum required grease
pressure is reached.
The minimum-level switch
A level switch maintains the grease level in the reservoir. When the grease reaches the minimum level, the
level switch will notify the control unit. At the beginning of every following greasing cycle a signal lamp in the
cabin will flash as a warning that the reservoir has to be refilled.
The test push-button
The grease system can be tested by starting one or more test cycles by means of the test push-button on the
pump unit. This button also can be used to reset the control unit.
Figure 1 Overview of the automatic greasing system
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