RING 8T4774 - Caterpillar

Stage 1
Illustration 1 g01071308
Stage 1The metering unit is in the normal position or the rest position. The metering unit has not yet filled with grease.Stage 2
Illustration 2 g01071309
Stage 2 (1) Channel (2) Chamber (3) Plunger (4) Plunger (A) Primary channelGrease is pumped into the metering unit through primary channel (A). Due to the grease pressure, plunger (3) is pushed to the right. The plunger will move 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) .Stage 3
Illustration 3 g01071310
Stage 3 (1) Channel (2) Chamber (3) Plunger (4) Plunger (5) Secondary grease line (6) Channel (7) Chamber (8) Channel (9) Channel (10) Check Valve (B) Primary channelGrease 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. Check valve (10) is pushed back in order to allow a clear path to the secondary grease line.During phase 4, the pressure drops in primary channel (B) .Stage 4
Illustration 4 g01071311
Stage 4 (2) Chamber (3) Plunger (4) Plunger (5) Secondary grease line (7) Chamber (8) Channel (9) Channel (10) Stop (A) Primary channelStage 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), plunger (3), channel (9), and the secondary grease line (5). Grease will then go to the grease point through the secondary grease line. Check valve (10) is pushed back in order to allow a clear path to the secondary grease line.Lubrication Pressure Switch
The lubrication 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, an error will be stored in the control unit.The lubrication pressure switch is preferably mounted on the distribution block that is located farthest from the pump. The pressure switch is mounted on the farthest distribution block in order to ensure that the required amount of grease pressure is reached. Pressure switches are delivered with a pressure (switch) of 15000 kPa (2175 psi). A switch with a higher pressure setting must be used if the switch is installed further away from the end of the system. The pressure switches are available with pressures of 10000 kPa, 12500 kPa, 15000 kPa, or 17500 kPa.The lubrication pressure switch operates in three stages.Stage 1
Illustration 5 g01213501
Stage 1 (1) Chamber (2) Plunger (3) Electrical contact (10) Spring (13) Diverter Valve (14) Pressure Switch (A) Channel (B) ChannelDuring stage 1, channel (A) and channel