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Chapter 11. WHEEL AND TIRE 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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Emergency Steering Function
TM 10-3930-673-34
12
STEERING SYSTEM MAINTENANCE
Para
Contents
Page
Section III.  Description and Data
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Section IV.  Steering System Maintenance Procedures
Drive Wheel Spindle Replacement/Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Steering Pump Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Control Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tie Rod Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section III. DESCRIPTION AND DATA
This chapter covers maintenance procedures for the steering system components, as well as principles of
operation.
12-2. PRINCIPLES OF OPERATION
a. System Components. The steering system components include steering valve (1), steer select valve (2),
and four steering hydraulic cylinders (3). Additional, related components include the large (3.94 cu. in.)
section of dual gear pump (4) and priority valve (5). Making up the emergency steering system are an electric
motor driven pump (6) and pressure switch (7). Pressure switch (7) senses hydraulic pressure in the main
steering circuit and closes to turn on the emergency steering pump motor and a warning light in the cab when
main system pressure drops to below approximately 75 psi (517.13 kPa).
b. Normal System Operation. Hydraulic flow from the large section of dual gear pump (4) is directed to
the inlet port of priority valve (5). The function of priority valve (5) is to ensure that sufficient oil flow goes to
steering valve (1) to permit normal steering in the event that any attachment functions are being operated at
the same time that steering is occurring. The priority valve (5) will deprive the attachment functions of oil
flow in order to maintain adequate flow for steering. Component overpressure protection is provided by relief
valve (8) which is built into priority valve (5).
As long as the steering wheel is not being turned, sleeve and spool assembly (9) remains centered and
gerotor (10) remains stationary. Priority valve (5) will then direct pump flow to the main control valve. The
pressure resulting from the blocking condition of the centered steering valve sleeve and spool assembly (9)
keeps priority valve (5) shifted to the right (as shown) to permit flow to the main valve. The steering
cylinders (3) are held stationary by trapped oil in the lines.
Turning the steering wheel in either direction will cause the spool in sleeve and spool assembly (9) to rotate
with respect to the sleeve. As this happens, oil is allowed to flow through passages in sleeve and spool
assembly (9) to gerotor (10). This oil flow causes the gear in gerotor (10) to rotate, directing flow back to sleeve
and spool assembly (9). The redirected flow now exits sleeve and spool assembly (9) via the proper work port

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