Operating
Instructions
Frequently Asked Questions (FAQ)
2K120/2K121
30
7
Frequently Asked Questions (FAQ)
Error Cause
of
error
Remedy
Gearbox is loud,
knocking noises
•
Loose contact on motor speed
sensor, which causes permanent
motor governing
•
Speed sensor dirty, no clear
signals sent
Check speed sensor and electrical
lines to motor, clean speed sensor if
necessary
Check engine management system,
adjust speed control accordingly
(softer setting)
Gearbox is loud,
running noise
Long periods at high cutting speed
in ratio 1:1 followed by change to
machining in ratio 4:1
No gearbox damage
Gearbox running noise normalizes
after several gear changes
Gearbox leaking at gearbox
input/output
Defective seals
Renew seals, send gearbox to ZF
for inspection if necessary
Gearbox leaking at breather
•
Oil has aged
•
Too much oil added during oil
change
•
Change the oil
•
Check the oil level and correct if
necessary
Machine control receives no
shift position signals from the
gearbox shift unit
•
Loose contact in the plug
connection on the gearbox shift
unit
•
Error in the shift unit
•
Check the plug connection and
clean if necessary, secure
connectors using clips
•
Send gearbox to ZF for inspection
Gear disengages
•
Limit position switch defective
•
Send gearbox to ZF Friedrichs-
hafen AG for inspection
