Reference: For more information about the lubrication pump, refer to Systems Operation, "Lubrication Pump".
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Do not open the metering units. The introduction of dirt inside the metering units may cause a malfunction. |
Each metering unit contains two chambers of grease. One chamber is for primary grease line (A) and the other chamber is for primary grease line (B). Both of the chambers are filled with an exact amount of grease. There are four stages of the injector cycle: Stage 1, Stage 2, Stage 3 and Stage 4.
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| Illustration 1 | g01071308 |
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Stage 1 | |
The metering unit is in the normal position or the rest position. The metering unit has not yet filled with grease.
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| Illustration 2 | g01071309 |
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Stage 2 (1) Channel (2) Chamber (3) Plunger (4) Plunger (A) Primary channel | |
Grease is pumped into the metering unit through primary channel (A). Due to the grease pressure, plunger (3) is pushed to the right. This will move the plunger past channel (1). The grease fills chamber (2) through channel (1) and the grease presses plunger (4) to the right.
During phase 3, the pressure drops in primary channel (A).
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| Illustration 3 | g01071310 |
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Stage 3 (1) Channel (2) Chamber (3) Plunger (4) Plunger (5) Secondary grease line (6) Channel (7) Chamber (8) Channel (9) Channel (10) Stop (B) Primary channel | |
Grease is pumped into channel (6) through primary channel (B). Due to the grease pressure, plunger (3) is pushed back to the left, past channel (8). The grease fills chamber (7). The grease then pushes plunger (4) back to the left. The grease that is inside of chamber (2) is pressed through channel (1). The grease flows through plunger (3), channel (9), and secondary grease line (5) to get to the greasing point. Stop (10) is pushed back in order to allow a clear path to the secondary grease line.
During phase 3, the pressure drops in primary channel (B).
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| Illustration 4 | g01071311 |
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Stage 4 (2) Chamber (3) Plunger (4) Plunger (5) Secondary grease line (7) Chamber (8) Channel (9) Channel (10) Stop (A) Primary channel | |
Stage 4 follows the same process as stage 2 except chamber (7) is now filled with grease. Plunger (4) is pushed to the right when chamber (2) is filled. The grease that is inside of chamber (7) is forced through channel (8), through plunger (3), through channel (9), and through secondary grease line (5) to the grease point. Stop (10) is pushed back in order to allow a clear path to the secondary grease line.
The pressure switch informs the control unit that sufficient pressure has been built up during the lubrication cycle. When the required amount of pressure is not reached, a warning light on the signal lamp will flash.
The pressure switch is preferably mounted on the distribution block that is located farthest from the pump. This is done in order to ensure that the required amount of grease pressure is also reached at the distribution block. Pressure switches are delivered with a pressure (switch) of
The pressure switch operates in 3 stages.
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| Illustration 5 | g01072173 |
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Stage 1 (1) Chamber (2) Plunger (3) Electrical contact (10) Spring (A) Channel | |
During stage 1, channel (A) and channel (B) are not under pressure. Chamber (1) is also under no pressure. Spring (10) pushes switch plunger (2) to the left. The electrical contact (3) is open.
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| Illustration 6 | g01072174 |
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Stage 2 (1) Chamber (2) Plunger (3) Electrical contact (5) Plate (6) Piston (7) Channel (8) Channel (9) Channel (10) Spring (A) Channel | |
During stage 2, grease is pressed into channel (A). While the grease pressure is built up, piston (6) is pushed to the right. Chamber (1) is connected to channel (A) through channel (7), channel (8), and channel (9). When the pressure in chamber (1) is greater than the force of spring (10), plunger (2) moves to the right. Electrical contact (3) is closed by plate (5).
During phase 3, the connection of the contacts is broken when the grease pressure in channel (A) is lower than the force of the spring.
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| Illustration 7 | g01153816 |
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Stage 3 (1) Chamber (2) Plunger (3) Electrical contact (5) Plate (6) Piston (7) Channel (8) Channel (9) Channel (10) Spring (11) Chamber (12) Channel (B) Channel | |
During stage 3, grease is forced into channel (B). While the grease pressure increases, chamber (11) fills with grease through channel (12). The grease pressure pushes piston (6) to the left. Due to the movement of piston (6), channel (8) is opened. This causes the grease to flow to chamber (1) through channel (7) and through channel (9).
When the pressure in chamber (1) is greater than the force of spring (10), plunger (2) moves to the right. Electrical contact (3) is closed by plate (5).
During phase 3, when the grease pressure in channel (B) is less than the force of spring (10), spring (10) pushes plunger (2) back to the left. The connection of the contacts is then broken.