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TM 10-3930-653-14&P
STEERING SYSTEM
Steering System:
Type:
Rear-wheel steering with power steering
Power Steering:
Type:
Semi-integral type
Steering Gear:
Type:
Recirculating ball nut type
Name:
Reduction Ratio:
18.5: 1
Pitman Arm Working Angle:
74.5°
Steer Handwheel Dia.:
380 mm (15 in)
Power Steering Cylinder:
Type:
Double acting
Cylinder Bore:
50 mm (1.97 in)
O.D. of Cylinder Rod:
22.4 mm (0.88 in)
Stroke:
240 mm (9.1 in)
Flow Divider:
Set Pressure:
70 kg/cm2 (1000 psi)
Set Flow Rate:
10 £/min (2.6 US gal)
GENERAL DESCRIPTION
The steering system is a rear-wheel steering type with a hydraulic booster, which consists of steering gear, power
cylinder and flow divider.
STEERING GEAR
The steering gear is a semi-integral type being composed of a recirculating ball nut, worm and a steering valve.
The worm and ball nut are both hardened and ground precisely to have the grooves (internal/external) of special
cross section. The steel balls are packed in the screw grooves between the ball nut and worm to convert sliding friction
force of the worm and ball nut into rolling friction force of steel balls, providing smooth, easy action of the steer handwheel.
As the steering shaft turns, the steel balls roll between the worm and ball nut unitl they reach the end of the ball nut, then
return to the inlet of the ball nut, guided through the ball tube. At the bottom of the steering gear case is installed a
steering control valve to control oil flow for the steering cylinder.
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