5
Fig. 1. Rotary mower Z-178: 1 - safety curtain, 2 - curtain frame, 3 - main frame, 4 - tension member, 5 - latch, 6
- guard, 7 - linkage frame, 8 - sliding disc, 9 - working drum, 10 - knife, 11 - tractor lower link, 12 - safety
device, 13 - transport beam, 14 - roof guard, 15 - safety chain, 16 - U-joint shaft, 17 - central frame.
Linkage frame (7) is used to connect mower and tractor. Linkage frame, through centre frame
(17), is jointed to main frame (3).
Cutting unit comprises two working drums (9), with loose knives (10) in lower part of drums. In
working position drums are supported on sliding discs (8) which allow for following any ground
unevenness.
The mower can be moved from transport to working position and the other way round by means
of jointed connection between linkage frame and central frame. Cutting unit safety curtain (1) protects
the machine operator and unauthorised personnel against hard objects which may be thrown at high
speed by working drums (9).
Spring safety device (12) prevents mower damages after driving the cutting unit on an obstacle.
Working drums (5) (Fig. 2.) are powered from tractor PTO shaft through U-joint shaft (1), driving
head shaft (2), belt-and-pulley drive (3) and ring-and-pinion gears (4). Drums with knives rotate in
opposite directions, cutting plants and forming forage as swath. Overrunning clutch (6) integrated with
pulley allows free rotation of drums after the engine is turned off, and thus protects drive elements
against damage.
n
2
= 2050 rpm (Z-178)
n
2
= 2350 rpm (Z-178/1)
n
2
= 1900 rpm (Z-178/2)
n
2
= 1600 rpm (Z-178/3)
Fig. 2. Mower drive diagram: 1 - U-joint shaft, 2 - driving head shaft, 3 - belt-and-pulley drive, 4 –
bevel-gear, 5 - working drum, 6 - overrunning clutch (not included in 178/3).
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