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Chapter 12. STEERING SYSTEM MAINTENANCE
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TM-10-3930-673-34 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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Section IV. STEERING SYSTEM MAINTENANCE PROCEDURES
TM 10-3930-673-34
TR00480
and goes to steer select valve (2). Steer select valve (2) ports oil flow to steering cylinders (3) according to the
selected steering condition (two-wheel, four-wheel, or crab). If two-wheel steering has been selected, only the
two front steering cylinders (3) are supplied. If four-wheel steering or crab steering has been selected, all four
steering cylinders are supplied.
c. Emergency Steering Function. Emergency steering pump (6) is powered by an electric motor and can
supply a flow of oil to the steering system independently of the main hydraulic system. If main steering
hydraulic pressure is lost or drops below a level of 75 psi (517.13 kPa), pressure switch (7) will close and
complete a circuit to energize the emergency steering pump motor. Emergency steering pump flow bypasses
priority valve (8) and goes directly to the inlet port of steering valve (1). A 1500 psi (10343 kPa) relief
valve (11) is used to protect the emergency steering pump (6) and other circuit components against
overpressure.
12-2

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