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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Hydraulic hoist is assembled in reverse sequence.
Before assembly sheck state of all sealing elements, rings 16 pressed in shells in particular, three
rubber and four plastic rings in distributor grooves – twisting of rings and their mechanical damage
(cuts, cracks, delamination) are not allowed, lubricate sealants and surfaces that contact them
during assembly, with fat grease.
Measure diameter of four bushings 14 (Figure 9.1) and adjacent diameters of swivel shaft sections
44, maximum difference of diameters must not exceed 0.5 mm. If necessary, press out and replace
bushings or shaft. When replacing left- 17 and right-side 18 swivel levers put on new levers new
marks corresponding to marks you made on removed parts.
When mounting distributor:
а ) to avoid damage of control valve before mounting distributor put distributor against body of
hydraulic hoist so that fixing openings in distributor and body of hydraulic hoist were about to
coinside;
b) insert distributor inside body of hydraulic distributor, put fastening bolts;
с ) one by one keep tightening fastening bolts until clearance between mounting places of
hydraulic hoist body and distributor fully disappears.
ATTENTION! Excessive tightening of fastening bolts can lead to jamming of distributor control
valve.
Pay attention if assembly and adjustment of power sensor (if it was disassembled) were made
right):
а ) tighten nut 33 of power sensor until axial clearance between support turn of spring 31 and
adjacent parts is closed;
b) keep screwing nut until its cuts coinside with cotter pin opening;
с ) insert cotter pin in opening of rod 27, so that its long tendril was on the side of rod threaded end
face, and bend this tendril to end face surface;
d) after assembled and adjusted power sensor is inserted inside opening of hydraulic hoist body,
put bolts, press its cover to body with hand, and fill clearance between them on left and right sides
with adjustment shims, difference in the number of spacers on the left and right sides must not
exceed one piece;
e) tighten bolts, check axial play of rod – it must not exceed 1 mm.
Replacement of damaged rubber rings (without complete disassembly of hydraulic hoist):
-
on top bushing 40 (Figure 9.1) (leakage between bushing and body 1) and on hollow roller of
power link 36 (leakage between bushing 40 and power lever 43):
а ) unpin and disconnect ropes 7 from levers 42 and 43, having unscrewed fastening bolt on roller
end face 41, dismount levers;
b) unscrew bushing 40;
-
on top roller 41 (Figure 9.1) (leakage between levers 42 and 43):
а ) unpin and disconnect corresponding rope 7 from position lever 42;
b) remove cover 10 of hydraulic hoist, having unscrewed bolts that fasten it;