TM 5-3805-261-20
PRINCIPLES OF OPERATION. (cont)
1-25.
STEERING. (cont)
b.
Supplemental Steering. Provides hydraulic oil flow to the steering if the engine fails or implement hydraulic
flow is lost while the machine is operating. The main components are the electrically driven motor/pump mounted in the
engine 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 governor
prevents automatic activation of the motor/pump during normal engine shutdown. A switch on the panel activates the
system 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.
Front Frame Section (Figure 1-35). Frame section is a large welded unit built up from heavy I-beam to
serve as a mounting for the front axle, blade, scarifier, hydraulic and electrical lines, and the cab. The cab mounting end
includes large hitch bushings to provide for articulation (pivoting) of the two section frame.
Figure 1-35.
b.
Frame and Case (Rear Frame Section) (Figure 1-36). This large weldment includes hitch bushings for
articulation and serves as a mounting for the engine and hood, radiator and fuel tank, transmission, differential, and final
drives.
Figure 1-36.
1-38
