TM 5-2410-241-23-1
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IMPLEMENT AND STEERING HYDRAULIC SYSTEM CONTINUED
Signal Resolver Network
00011
The 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, Figure 43 indicates the resolver network when the ripper lift control valve is activated. The resolver in
the ripper lift control valve compares the float boost signal (Figure 43, Item 1) to the signal (Figure 43, Item 2) from
the ripper tip control valve. Since the ripper tip control valve is activated, the signal (Figure 43, Item 2) is higher.
The resolver ball shifts and the signal (Figure 43, Item 2) is sent to the next resolver. The next resolver in the
bulldozer angle control valve compares the signal from the ripper tip control valve to the signal (Figure 43, Item 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 blade tilt
control valve (Figure 43, Item 4). The signal from each of the implement control valves is compared in this way.
The steering control valve (Figure 43, Item 6) also has a signal.
The highest resolved signal from the implement control valves goes through the line (Figure 43, Item 7) to the
compensator valve on the implement pump. The signal to pump compensator instructs the pump to vary output in
order to meet the highest load requirement. The pump compensator valve adds margin pressure to the load
requirement.
N OT E
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 (Figure 43, Item 5) is in the FLOAT position or in the LOWER position, pilot oil
enters the end of the resolver network as the float boost signal (Figure 43, Item 1). When the blade lift control valve
is in FLOAT and none of the other implements are activated, the float boost signal (Figure 43, Item 1) is sent
through the resolver network to the pump compensator valve. This 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 the tank pressure. The
pump compensator valve keeps the implement pump at LOW PRESSURE STANDBY until an implement is
activated.
Figure 43. Ripper Tilt Control Valve Activated.
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END OF WORK PACKAGE
