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Adjusting method: loosen nut (7), turn adjusting screw (8) to make rock arm shaft (2)
move axially and therefore the mesh clearance is changed.
When the rock arm shaft is in middle position, the free travel of steering wheel outside is
°
50-55mm, i.e. the idle angle of the steering wheel is no more than 15 , then the adjustment
is suitable. After adjustment, lock nut (7).
2) Adjustment of circulating ball type steering gear
A. Adjustment of bearing clearance
In order to ensure the normal work of the steering gear, the clearance of the bevel
bearings 7304 on both ends of the rock arm shaft should be adjusted. When the bearings wear
out and the axial clearance of the bearings increases, the clearance should be adjusted in
time; i.e. make the upper and lower moving play of the steering worm be not more than
0.1mm through increasing or reducing the quantity of adjusting shim (7).
B. Adjustment of mesh clearance of rock arm shaft (with steering worm and nut
assembly) and fan teeth of rock arm shaft.
During operation, the mesh clearance will increase due to the wear out of fan teeth of the
rock arm shaft (with steering worm and nut assembly) and the idle angle of the steering wheel
will also increase; so adjustment should be made in time. Loosen nut (2), turn adjusting screw
(1) to make rock arm shaft move axially and therefore the above mesh clearance is changed
.
3) Construction and adjustment of balance string type hydraulic steering gear
A. Working principle of balance string type hydraulic steering gears BZZ series balance
string type hydraulic steering gears are adopted in the hydraulic steering gears of Agracat
series tractors; their structure diagram is as Fig.4-14. It is mainly made up of steering control
valve and steering measuring device.
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