Minsk Tractor Works Belarus 1221.2, Disassembly-Assembly Manual

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Disassembly-assembly manual for tractor BELARUS-1221.2/1221 В .2/1221.3/1221.4
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Installation of new switch ВК 12-51 is made in reverse order.
Torque of switch 2 - (45±5) Nm.
Number of adjustment spacers (1) is provided by adjustment of switch actuation (2). Actuation of
switch (2) (contacts opening) must take place when drive wheels turn to angle over (13±2)° to any
side (decrease of the number of adjustment spacers leads to reduction of switch actuation angle).
With position of drive wheels corresponding to straight movement, contacts of switch (2) must be
closed (extension on lower axle of left-side FDA reduction gear presses switch ball). Lower axle of
the left-side reduction gear differs from other ones by availability of lug. This axle must be mounted
so that the lug was located along FDA axle (across the tractor). The availability of lug can be
checked by means of screwdriver through threaded opening where switch (2) in FDA beam is
installed.
ATTENTION: When lubricating bearing of lower left-side axle remember that bearing cavity is
closed tightly, and building up of excessive pressure inside cavity when injecting grease leads to
damage of switch
ВК 12-51.
To replace harness (4) across FDA to switch ВК 12-51 ( sensor of turn angle if drive wheels ) do
the following :
а ) ) disconnect terminals of harness (4) and (7
b) remove pin carrier socket (6) from harness (4);
с ) disconnect gaskets (5) for fastening harness (4
d) pass the harness through pipe (3).
Install new harness in reverse sequence
To replace elements on panel (15) for control of DI and FDA ( switches, control lamps, relay
and so on) do the following:
а ) unscrew four screws (17) for fastening cover (16) and raise cover as an assembly with panel (15)
b) disconnect terminals of harness (8) from corresponding element, remove the element from panel
(15).
Installation of corresponding element is made in reverse sequence
11.5.4 Operations to be performed when replacing engine:
а ) on both sides disconnect connectors of engine harness (7) (from FDA harness (4) and from
cabin harness (8));
b) dismount engine harness 7.
After replacement of engine install and connect harness (7) in reverse sequemce.
11.5.5 Operations to be made when dismounting-mounting the cabin:
а ) before dismounting the cabin disconnect connectors of cabin harness (8) from engine harness
(7) and transmission harness (18);
b) After mounting the cabon connect terminals of cabin harness (8) to engine harness (7) and
transmission harness (18).
Replace harness of DI and FDA control system according to diagram (Figure 12.4).