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TM 5-2420-230-24-1
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DUAL STEERING SYSTEM
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Two or more integral steering gears are sometimes used where high front axle loads or space limits exist.
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The secondary (slave) gear assembly is different from the master gear. It does not have an actuating shaft or an
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actuating valve. The steering gears in a dual system are not mechanically connected. Each gear has it's own
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steering linkage and pitman arm.
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Pressure to operate the secondary, or slave, gear is passed through ports in either the cylinder head, sector shaft
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bore or bearing cap of the master gear. It is routed through high pressure lines to the proper end of the slave
gear. When the actuating shaft of the master gear is moved, it causes a pressure build-up on the piston of the
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master gear. This same pressure is directed to the opposite end of the slave gear piston.
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Figure illustrates a typical dual M-Series master gear layout. Fluid from the slave gear is returned to the mas-
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ter gear and back to the reservoir. The lines between the master gear and slave gear act as both pressure
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and return lines.
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Figure illustrates an M-Series master gear and a 92-Series slave gear used in a dual steering installation. Fluid
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from the master gear is routed through the pinion gear area of the slave gear and then to the reservoir. This
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system requires the use of more hoses than the dual M-Series system.
Pressure relief plungers are not required on slave gears. Pressure relief is in the master gear.
WARNING
BLEEDING OF THE DUAL SYSTEM IS CRITICAL WHENEVER THE OIL HAS
BEEN CHANGED, THE SYSTEM HAS BEEN OPENED, OR A STEERING
GEAR HAS BEEN REPLACED. FOLLOW THE "DUAL SYSTEM BLEEDING
PROCEDURES" OUTLINED IN THE "COMMON PROCEDURES" SECTION
OF THIS MANUAL.
K-99
