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Bosch Rexroth AG
Linear modules MKK/MKR-xxx-NN-3 | R320103169/2020-08
13
Lubrication
13.1
Notes
This chapter describes the basic lubrication of the linear motion system, if this has not been done by the
manufacturer, and the relubrication by the customer.
The required basic lubrication and relubrication by the customer is limited to the lubrication of the rail system
and the ball screw assembly.
The basic lubrication of all other components, e.g. deep-groove ball bearings, cover strips, gear units, etc. is done
by the manufacturer.
X
Before using lubricants, read and observe the appropriate safety data sheets.
Do not use lubricants with solid particles (e.g. graphite or MoS
2
).
If you use different lubricants from the ones stated, you may find that relubrication intervals are shorter and that
performance decreases with short stroke and load ratio; in addition, chemical interactions may take place between
the plastics and lubricants.
Central lubrication systemsalso need to be able to pump these lubricants.
If using a central lubrication system, make sure all lines and elements are filled with lubricant all the way to the
connection to the consumer (carriage) and that there are no air bubbles.
X
We recommend carrying out initial lubrication separately using a grease gun before connecting to the central
lubrication system.
X
The pulse count can be calculated as the quotient (rounded to the next whole figure) of the re-lubrication
quantity and the smallest permissible piston distributor size (minimum impulse quantity). The lubricating cycle
time is the result of dividing the lubrication interval by the determined pulse count.
Lubricant reservoirs should contain an agitator to ensure the lubricant can flow (avoids hardening in the reservoir).
For relubrication, it is not possible to switch from grease to oil lubrication and vice-versa.
If environmental factors such as contamination, vibrations, impact loads, etc. are present, we recommend shorter
relubrication intervals. Even under normal operating conditions, relubrication is required every two years due to
grease aging.
Rexroth recommends piston distributors by SKF. These should be installed as close to the carriage lube fittings as
possible. Avoid long lines (no longer than 1 m) and narrow line diameters. Install the lines at a gradient.
If other consumers are connected to the single-line lubrication system, the weakest link in this chain determines
the lubrication cycle. Excess lubricant can accumulate inside of the product or flow out and may lead to
contamination of the environment.
c
Attention!
For special operating conditions, please contact us - especially in case of glass fiber dust, wood dust, sol-
vents and short strokes!
