MTZ 1220.1 Operator'S Manual Download

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MTZ 1220.1/1220.3

Section J. Possible failures

Defect, external manifestation

Way of elimination

Steering wheel rotates without turn of steerable wheels

Insufficient level of oil in oil tank.

Fill a tank up to demanded level and pump
over hydrosystem for air removal.

Sealings of piston of hydrocylinder are worn
out.

Replace sealings or hydrocylinder.

Steering wheel does not rotate to “neutral” position,

“motoring” of pump-meter

Increased friction or shimming in mechani-
cal elements of steering column.

Eliminate reasons of friction and shimming.

Spline shank of steering column and pump-
meter are installed out of axis alignment
(end thrust of cardan shaft) or with insuffi-
cient backlash.

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.

Increased gap of steering wheel

Conical pins of hydrocylinders or steering
drawbar are not tightened.

Tighten nuts of pins by moment 12...14 ki-
logram-force m and splint.

Increased backlash of spline connection
«cardan of steering shaft — pump-meter».

Replace cardan bottom plug.

Unequal minimum radiuses of turn of tractor to the right-to the left

Toe-in is not adjusted.

Adjust toe-in as it is specified in section “Ad-
justments”.

Incomplete corner of turn of directive wheels

Insufficient pressure in hydrosystem of
steering control.

Adjust pressure within limits 140...155 kilo-
gram-force/sm

Feeding pump has a defect.

Repair or replace pump.

Hydraulic lift linkage

With hydraulic lift

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.

Disassemble and wash the safety valve.
Adjust the pressure maintained by the
safety valve.

The unloaded mounted attachment is not lifted; when setting any handles of the
distributor to the “lifting” or “lowering” position, a specific sound emitted by the
pump under load is heard. After stopping the diesel engine and moving the posi-
tion handle to the foremost position and then to the rear position and starting the
diesel engine, the mounted attachment is lifted (the power handle shall be in the
foremost position).
Clogging the orifice in the overload valve.

Remove the regulator-distributor from the
tractor, remove a bypass valve from it, wash
the valve and clean off the valve orifice.

The unloaded mounted attachment is not lifted; when setting any handles of the
distributor to the “lifting” or “lowering” position, a specific sound emitted by the
pump under load is heard. After stopping the diesel engine and moving the posi-
tion handle to the foremost position and then to the rear position and starting the
diesel engine, the mounted attachment is not lifted (the power handle shall be in
the foremost position).