S T E E R I N G S Y S T E MTM 5-3805-258-24-1S Y S T E M S O P E R A T I O NSUPPLEMENTAL STEERINGSYSTEMSUPPLEMENTALI. Left neutralizer valve.6. Pilot section of pump.2. Handmetering unit7. Steering section of(HMU).pump.3. Right neutralizer valve.8.Implement section of4. Checkvalve for pilotpump.syatam.9. Steering control valve.5. Relief valve for pilotsystem.NOTE: The Hand Metering Unit will not give man-ual steering when the engine is stopped. Steeringwith a dead (stopped) engine can be done only whenthe Supplemental Steering System is installed.The supplemental steering system has twopurposes:(1) To give an oil supply for the steering system ifthere is a failure of the primary system or if theengine stops when the machine is moving.STEERING SYSTEM10. Valve spool.15. Right steering cylinder.11. Orifice.16. Flow switch.12. Leftsteering cylinder.17. Diverter valve.13. Hydraulic tank.18. Supplemental steering14. Oil cooler.pump.(2) To add oil to the primary oil flow at low enginerpm when the machine is moving.NOTE: When the machine moves, the flow of oilfrom the supplemental steering pump either; (a)combines (flows together) with the flow from steer-ing pump section (7) (at LOWER ENGINE rpm),or (b) is sent back to hydraulic tank (13) (at HIGH-ER ENGINE rpm). The supplemental flow startsto return to the hydraulic tank at 1450 ± 150 rpm.3-67
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