Hydraulic Lift Linkage - Belarus 1221B.2 Operator's Manual

BELARUS-1221.2/1221В.2/1221.3
Defect, external manifestation
gaged.
Lack or insufficient pressure in hydraulic system of steering
(Pressure in hydrosystem of steering should be 140...155 kilogram-force/sm
arrester))
Insufficient oil level in tank; feeding pump
does not develop necessary pressure.
Safety valve of pump-dosator hovered in
open position or it is adjusted to a low
pressure.
Significant friction or shimming in mechani-
cal elements of steering column.
Air leak into absorbent main line of system. Check absorbing main line, eliminate lea-
Steering wheel rotates without turn of steerable wheels
Insufficient level of oil in oil tank.
Sealings of piston of hydrocylinder are worn
out.
Steering wheel does not rotate to "neutral" position,
Increased friction or shimming in mechani-
cal elements of steering column.
Spline shank of steering column and pump-
meter are installed out of axis alignment
(end thrust of cardan shaft) or with insuffi-
cient backlash.
Conical pins of hydrocylinders or steering
drawbar are not tightened.
Increased backlash of spline connection
«cardan of steering shaft — pump-meter».
Unequal minimum radiuses of turn of tractor to the right-to the left
Toe-in is not adjusted.
Insufficient pressure in hydrosystem of
steering control.
Feeding pump has a defect.
The unloaded mounted attachment is not lifted; when setting any handles of the
distributor to the "lifting" or "lowering" position, no specific sound emitted by the
pump under load
Clogging of the safety valve of the tractor
distributor.
Increased effort on steering wheel
"motoring" of pump-meter
Increased gap of steering wheel
Incomplete corner of turn of directive wheels

Hydraulic lift linkage

Possible defects and ways of their elimination
Way of elimination
ing axle. When the disorder is found –
eliminate it.
Steering
Fill in tank with oil up to necessary level
and pump up hydrosystem for air removal
Wash out safety valve and adjust pressure
for 140...155 kilogram-force/sm
engine work at nominal turns.
Check and eliminate reasons preventing
steering column from fluent motion in me-
chanical elements.
kage. Pump up system for air remove.
Fill a tank up to demanded level and pump
over hydrosystem for air removal.
Replace sealings or hydrocylinder.
Eliminate reasons of friction and shimming.
Release cardan.
For increase of backlash install additional
washers with thickness no more than 1,5
mm between pump-motor and bracket of
steering column.
Tighten nuts of pins by moment 12...14 ki-
logram-force m and splint.
Replace cardan bottom plug.
Adjust toe-in as it is specified in section "Ad-
justments".
Adjust pressure within limits 140...155 kilo-
gram-force/sm
Repair or replace pump.
Disassemble and wash the safety valve.
Adjust the pressure maintained by the
221
2
2
.
2
(in
at diesel-