TM 5-3805-261-20PRINCIPLES OF OPERATION. (cont)1-25.STEERING. (cont)b.SupplementalSteering. Provides hydraulic oil flow to the steering if the engine fails or implement hydraulicflow is lost while the machine is operating. The main components are the electrically driven motor/pump mounted in theengine compartment, and a sensor mounted on the hydraulic combination valve. Refer to paragraph 1-29.The sensor activates the motor/pump when pressure is lost in the hydraulic system. A switch on the engine governorprevents automatic activation of the motor/pump during normal engine shutdown. A switch on the panel activates thesystem for testing or for use during towing. Refer to Appendix F for supplemental steering system schematic.1-26.FRAME, TOWING ATTACHMENTS, DRAWBARS AND ARTICULATION SYSTEM.a.FrontFrameSection(Figure 1-35). Frame section is a large welded unit built up from heavy I-beam toserve as a mounting for the front axle, blade, scarifier, hydraulic and electrical lines, and the cab. The cab mounting endincludes large hitch bushings to provide for articulation (pivoting) of the two section frame.Figure 1-35.b.FrameandCase(Rear Frame Section) (Figure 1-36). This large weldment includes hitch bushings forarticulation and serves as a mounting for the engine and hood, radiator and fuel tank, transmission, differential, and finaldrives.Figure 1-36.1-38
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