Section G. Maintenance
Belarus – 90/92 Operating manual
101
For adjustment of engagement
“worm – sector” loosen bolt 5, and input key
in hub flange recess, turn hub 6 clockwise
(along the tractor movement) as far as it will
go, at this moment tie-rod arm should be in
middle position, then turn hub contra
clockwise by 10-12 mm to outside diameter
of the flange. Tighten bolt 5, crank up the
engine and make sure, that there are no
jamming, when rotate steering wheel to
both sides against to the stop.
If it is necessary, increase clearance
in engagement by turning hub contra
clockwise until jamming disappears.
For adjustment of engagement
“sector- rack” reduce thickness of shim
washer set 24 under the flange of limit stop
23 until between stop and rack appears 0,1
– 0,3 mm clearance. By clearance control
press rack to the sector.
Using spherical worm nut 30 can be
tightened end-thrust bearings 28. Correct
tightening of end-thrust bearings is the most
important factor for normal operation of
hydraulic booster. Excessive nut tightening
can cause warp of valve core and non-
uniform turn effort. Before tightening nuts,
bolt on distribution block, but previously
shim washers under bolt heads in thickness
of head flange (Fig. 117). Tighten worm nut
to 2 kgf•m (20 N-m), unscrew it by 1/12—
1/10 turns until the hole in the worm
matches locknut pin hole and then fasten
nut by cotter. Unscrew two tension bolts
from distributor block to the casing, put
cover and fix reliably distributor block.
For adjustment of axial stroke of
turning shaft 21 loosen check nut 12, screw
adjusting bolt 10 against the stop into the
shaft end, then unscrew by 1/8 — 1/10
turns and locknut with safety nut.
For adjusting of emergency valve
attach to discharge manifold or to valve
cover instead of plug 1 manometer with
gauge face not less than 100kgf/cm2 (10
М
P
а
). Turn steering wheel against the
stop, let diesel operate at maximal speed
and turn regulating screw 3 until
manometer indicate pressure 88 kgf/sm2
(8.8
М
P
а
). After valve adjusting locknut the
cap with wire. Perform adjustment at the oil
temperature 50±5°
С
.
Check free travel of the steering
wheel, when diesel is in operation on tractor
parking. Free travel in this case should not
exceed 20°. At increased free travel check
plays in steering gear connections, screw
nuts of tie-rod arm, of sector and pivoted
levers, adjust joints of steering link, check
tightening of the worm nut, of engagements
“worm- sector”, “sector – rack” and axial
stroke of hydraulic booster turning shaft.
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