Troubleshooting and fault correction
61/64
RE 79039-01-B/01.2021, MOBILEX GFB 8000 series 40 general operating instructions,
Bosch Rexroth AG
Table 7
Malfunction table of the MOBILEX GFB 8000
Malfunction
Possible cause
Remedy
Changed gearbox noises
Damaged gears
Notify Customer Service.
Check toothed components for
flaws such as pittings.
Let the damaged parts be replaced
by Rexroth Service.
Bearing play
Notify the Rexroth Service.
Bearing defective
Noises
Gearbox fastening has
become loose
Tighten screws with the required
tightening torque.
The operating
temperature is
substantially higher than
normal
The oil level is too high
or too low
Allow the planetary gearbox to cool
down to approx. 50 °C.
Check the oil filling level.
If required, fill with lubricating oil
or drain off lubricating oil if oil level
is too high.
The lubricating oil is too
old or badly
contaminated
Check in the operating instructions
of the system, machine or vehicle
when the last oil change took place,
if appropriate proceed to an oil
change. Proceed as described in
chapter 10.2 “Inspection”.
Leaking oil
Defective output seal.
Check seals as far as possible,
replace if necessary.
If the leak cannot be eliminated,
Rexroth Service must be notified.
Seals on partition seams
or on the locking screws
are defective
Lubricating oil is foaming Incompatibility of the
filled in lubricating oil
with the oil remains or
the preservation oil of
the planetary gearbox.
Replace the lubricating oil and rinse
with appropriate purging oil.
Decreasing or non-
existent brake action
Thermal overload of the
multiple-disk brake
Contact the Rexroth Service.
Let trained staff or Rexroth Service
employees carry out an inspection
on the multiple-disk brake. Replace
the disks, springs and sealing
elements.
If the malfunctions occurred cannot be eliminated, contact one of the contact
addresses indicated on
www.boschrexroth.com
or in the address directory in
appendix A “Address directory” of the material number-specific operating
instructions.
