Copyright Goodheart-Willcox Co., Inc.
Chapter 18 Load-Sensing Pressure-Compensating (LSPC) Hydraulic Systems 447
The donated priority valve had previously been used for corporate service
training. After further inspection, he discovered that the spool had not been
placed back into the priority valve. A new priority valve was ordered and the
problem was solved.
Reasons to Use a Jammer Solenoid in an LSPC System
Manufacturers typically use jammer solenoids in LSPC systems for two
reasons. The fi rst reason is to force the hydraulic system to perform the same as fi
a PC hydraulic system described in Chapter 17. Any time the jammer solenoid 7 7
is activated, the LSPC pump operates at high system pressure and little flow. fl
Figure 18-23. A jammer solenoid valve used in an LSPC variable-displacement system is designed to connect pump
outlet pressure to signal pressure when energized, resulting in the LSPC system operating in the stall mode.
Bias
spring
Swash
plate
Shuttle valve
Control piston
Axial piston
Axial piston
Pressure
compensator
spool (2500 psi)
Flow
control
spool
(300 psi)
Signal solenoid valve
(jammer valve)
DCV