BOOSTER-CLUTCH 5386687 - Caterpillar

Illustration 1 g02798677
Signal Resolver NetworkThe illustration includes the resolver for the ripper. (1) Float Boost Signal (2) Passage from Ripper Tip Control Valve (3) Passage from Ripper Lift Control Valve (4) Passage from Bulldozer Tilt Control Valve (5) Passage from Bulldozer Lift Control Valve (6) Passage from Steering Control Valve (7) Signal to Pump CompensatorThe resolver network consists of a resolver (ball check valve) in each implement control valve. Each resolver compares the pressure signal from the previous control valve and the pressure signal from the current control valve. The resolver ball shifts in order to allow the higher signal to flow to the next resolver.For example, Illustration 1 shows the resolver network when the ripper tip control valve is activated. The resolver in the ripper tip control valve compares float boost signal (1) to signal (2) from the ripper tip control valve. Since the ripper tip control valve is activated, signal (2) is higher. The resolver ball shifts and signal (2) is sent to the next resolver. The next resolver compares the signal from the ripper tip control valve to signal (3) from the ripper lift control valve. Since the ripper lift control valve is not activated, the signal from the resolver in the ripper tip control valve is higher. The ball shifts in order to send the higher signal to the next resolver in the bulldozer tilt control valve (4). The signal from each of the implement control valves is compared in this way.The highest resolved signal from the implement control valves goes through line (7) to the compensator valve on the implement pump. The signal instructs the pump to vary output in order to meet the highest load requirement. Also, the pump compensator valve adds margin pressure to the load requirement.Note: The resolver network does not add various loads together. Instead, the single highest resolved load governs the pump output.When the blade lift control valve is in the FLOAT position or in the LOWER position, pilot oil enters the end of the resolver network as float boost signal (1). When the blade lift control valve is in FLOAT and none of the other implements are activated, float boost signal (1) is sent through the resolver network to the pump compensator valve. This signal adjusts the pump output in order to maintain the necessary supply pressure that is required for pilot oil to keep the valve spool in the FLOAT position.When all of the implements are in HOLD, the pressure in the resolver network is equal to tank pressure. The pump compensator valve keeps the implement pump at LOW PRESSURE STANDBY until an implement is activated.