Operator’s manual
Front disc mower
KDF 390
- 17 -
Tab. 5. Oil capacities
Model
Oil capacity [l]
Oil type
Lubrication frequency
KDF 390
about 1
(SAE 80W/90, API GL-4)
Once every 3 seasons
(if working intensively)
CAUTION:
The above instructions should be strictly followed. If the discs in
the cutterbar rotate loosely, do not worry about the high intersecting axis
gear
temperature;
after
long
working
time
it
may
reach
even 60 - 80
o
C.
8.
DEFECTS AND THEIR REPAIRS
Tab. 6. Defects and their repairs
Defect
Reason
Reapair
Mower stops working or
leaves uncut grass between
the disco
Worn knives
Replace knives
Improperly mounted knives
Put on knives strictly acc. to
instructions.
Too high PTO rpm
Reduce PTO rpm
Damaged FORTSCHRITT’s PTO
Repair
Lying grass
Always mow low
Mower is blocked
Damaged gears in the cutterbar
Check all the gears
Damaged bearings in the disc hub
Replace the bearing
Swath guides wre set too narrow
Widen swath guides to the
maximum
Mower does not work, even
though the drive is transmitted
from self-propelled mower.
Torn off shaft of intersecting axis gear
Replace intersecting axis gear
Torn off or or cut off key in the
cutterbar drive shaft
Put on new, genuine key
The mower cause too much
noise
Too low oil level in the cutterbar
Check the oil level and refill, if
needed
The mower slows down, even
though the rpm are stable
Burnt clutch in PTO shaft
Replace the clutch
Leaking cylinder
Dirty oil in hydraulic unit of the tractor
Replace oil in hydraulic unit of
the tractor (recommended class of
cleanliness of oil according to
NAS 1638 is minimum 9-10).
Purchase repair kit of the cylinder
and replace damaged sealings
Excesive vibration during
work
Damaged PTO shaft
Check the condition of PTO shaft
and if need be replace
Oil leak in gear
Not tight assembly
Examine tightness and check oil
level.
