Zetor Major 80 Operator's Manual page 136

COGGED BELT TENSION
With proper cogged belt tension the
bending of belt must be 5.5 mm with
force effect of 25 N on a single belt.
Perform cogged belt tension to pre-
scribed value after releasing tightening
screws (1, 2).
COGGED BELT TENSION OF AIR-
CONDITION COMPRESSOR
With proper cogged belt tension, bending
of belt must be 7.5 mm with force effect
of 25 N on a belt.
Perform cogged belt tension to pre-
scribed value after releasing tightening
screws of air-condition compressor.
ADJUSTMENT
FH12N085
TIGHTENING HEADS OF ROLLERS
Tightening heads of engine rollers is
done with a cold engine in prescribed or-
der.
Tightening torque
Valve clearance
E752
ADJUSTING VALVE CLEARANCE
Adjusting valve clearance is done with a
cold engine. Proper valve clearance with
suction
0.25±0.05 mm.
160 - 180 Nm
Alternating the movement of balance
0,25 ± 0,05 mm
arms:
136
and exhaust
Alternating roller Roller valve is
balance arms adjusted
1.
3.
4.
2.
E753
valves is
4.
2.
1.
3.