Minsk Tractor Works Belarus 1221.2, Руководство по разборке и сборке

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Disassembly-assembly manual for tractor BELARUS-1221.2/1221 В .2/1221.3/1221.4
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b) put under end face of switch (5), (figure 5.21) initial number (5-6 pcs) of adjusting shims (4);
с ) by removing one adjusting shim after another, obtain such position of switch when its contacts
are closed;
d) put half-clutch to position “ II ”, when knuckles of halg-clutch and drum are fully taken apart and
pusher is recessed in extreme position;
Position “ II” (clutch is disengaged)
Figure 5.22
e) check opening of switch contacts in position “ II ”.
Note: In position «I», dimension « А » between end faces of pusher and switch should be at least
11.5 mm (figure 5.21). Failure to observe this requirement can lead to switch damage.
Switch is considered to be correctly adjusted, if in position «
I » its contacts are closed, and in
position “ II ” they are open. Make verification by control lamp. The check is allowed to be made by
signaling device on the control panel, with key of FDA drive control being in the middle position.
Testing hydraulically squeezed clutch
а ) to opening “ А ” (figure 5.23) of hydraulically squeezed clutch shell connect pipeline of the test
bench for measuring leakage of operation fluid;
b switch on the test bench;
с ) check hydraulically squeezed clutch for value of allowable leakage at operation fluid pressure of
1 . 0
9 . 0

М Pa (9+1 kgf/cm 2 ) within 1 min;
d) if leakage of operation fluid exceeds allowable value, replace sealing rings or mating parts of
hydraulically squeezed clutch.
Leakage value across sealings of
hydraulically squeezed clutch, l/min
Nominal value 1.3
Extreme value 2.5