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5.5.5 Oil Lubrication
Harmonic Drive® Units with oil lubrication are generally customer-specific solutions. Please follow the notes given on the
confirmation drawing and refer to chapter 4.10.2 for allowed oil types. The oil temperature during operation must not exceed
90 °C. The minimum requirement is mineral oil CLP 68 (ISO VG 68) according to DIN 51517 T3. Oil must be filled into the unit by
the customer as the standard delivery does not include any oil lubricant.
The confirmation drawing includes the required oil quantities. The oil quantity defined on the confirmation drawing must be
obeyed in any case. Too much oil results in excessive heat production and early wear due to the thermal destruction of the oil.
If the oil level is too low, this may lead to early wear as a result of the lack of lubricant.
The first oil change should be performed after about 100 hours of operation. Subsequent change intervals depending
on the load, but should be carried out in a period of about 1000 hours.
To change the oil, the old oil must be completely drained and new oil introduced. Recommended oil types can be found in
table 49.2. The mixture of lubricants with different specifications is to be avoided.
5.6 Assembly Preparation
Assembly preparation
The gear assembly must be carried out very carefully and within a clean environment. Please make sure that during the
assembly procedure no foreign particles enter the gear.
General information
Clean, degrease and dry all mating surfaces to ensure an adequate coefficient of friction. The values given are valid for
12.9 quality screws which must be tightened by means of a torque wrench. Locking devices such as spring washers or toothed
washers should not be used.
Auxiliary materials for assembly
For the assembly, we recommend the application of the following auxiliary materials or the use of those with similar
characteristics. Please pay attention to the application guidelines given by the manufacturer. Auxiliary materials must
not enter the gear.
Surface sealing
• Loctite 518
• Loxeal 28-10
Recommended for all mating surfaces, if the use of o-ring seals is not intended. Flanges provided with O-ring grooves must
be sealed with sealing compound when a proper seal cannot be achieved using the O-ring alone.
Screw fixing
• Loctite 243
• Loxeal 55-03
This adhesive ensures that the screw is fixed and also provides a good sealing effect and is recommended for all screw
connections.
Assembly paste
• Klüber Q NB 50
Recommended for o-rings which may come out of the groove during the assembly procedure. Before starting with the
assembly you should spread some grease (which you can take from the gear) on all other o-rings.
Adhesives
• Loctite 638
Adhesive applicable to the connections between motor shaft and Wave Generator. You should make use of it only if this is
specified in the confirmation drawing.
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V02
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