Operator’s manual
Front disc mower
KDF 390
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8. DEFECTS AND THEIR REPAIRS
Tab. 8. 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.
9. DISASSEMBLY AND WITHDRAWAL FROM USE
9.1. Disassembly
WARNING!
Prior to commencing repair works the mower should be disconnected from the
tractor.
Before starting any repair or service the mower should be cleaned and any grass or dirt
removed. Carefully check nuts and bolts for correct tension and the pins for wear. Replace as
necessary.
After checking nuts and bolts, proper slack in joints and gears we can assess if the machine is
still serviceable. Worn out bolts, pegs, pins, discs, holders, knives etc. should be replace.
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