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1.Four-bar steering linkage
2.Steering cylinder (See Appendix 7)
3.Front driving wheel .
4.Full hydraulic steering gear
102SC-1-63-07-AH
5.
Steering-wheel
6. Constant flow pump HLCB-D04/04
7. Diesel engine
8. Oil Filter
9. Oil tank (i.e. rear axle housing)
Fig. 8 Working principle of the full hydraulic steering gears
5.4.2
Structure of the full hydraulic steering gear and points for attention
a. The structure of the full hydraulic steering gear is shown in Fig. 9. The Rotary servo valve,
consisting of the Valve element (6), Valve bush (5) and Valve body (4), controls the flow
direction of hydraulic oil. The Stator (9) and Rotor (10) makes up the pair of cycloidal
toothing functioning as the flow control valve, which makes the hydraulic oil flow enter into
the steering cylinder be in the direct ratio of the turning angle of steering wheel. The Linkage
shaft (7) transmits torque.
b. The full hydraulic steering system is actuated by the steering cylinder, therefore, the torque
to be applied to the steering wheel is little, normally 4-5 N. m. If the steering operation is
found out to be quite heavy or even jamming, please do not recklessly turn the steering wheel
with fierce force but to check thoroughly and fix up the trouble first.
c. In case the tractor is to be dislocated by pushing or hauling while its engine is stopped
working, then the steering wheel should be turned fully manually. Please note the torque to
be applied to the steering wheel should not be over 250 N. m, and further more, the impulsive
and fierce force is prohibited, otherwise some parts might be damaged.
d. Great care should be taken of the concentricity of the steering shaft and the full hydraulic
steering gear while assembling. A clearance of 0.5
～
1.0 mm should be kept between the
steering shaft and steering gear and there also should be a little bit endplay of the steering
shaft, so as to avoid any jamming.
e. Check all the screw connection portions and tighten all the bolts and nuts to avoid any
oil leakage of all coupling surfaces and connecting parts, because the oil leakage is
strictly forbidden while the Full hydraulic steering gear is working.
