42
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Torque for the oil-fill plug and oil-drain plug: 10 Nm
Gasket: P/N: 239 55 165
We can only guarantee that the pump operates as specified by the
technical data if the lubricants recommended by us are used.
5.5
Cleaning the Inlet Screen
A wire-mesh sieve is located in the intake port of the pump to act as a dirt
trap for coarse particles. It should be kept clean to avoid a reduction of the
pumping speed.
For this purpose, remove the inlet screen (1.2/2) from the intake port and
rinse it in a suitable vessel with solvent. Then thoroughly dry it with compres-
sed air. If the inlet screen is defective, replace it with a new one.
The cleaning intervals depend on the application. If the pump is exposed to
large amounts of abrasive materials, a dust filter should be fitted into the
intake line.
5.6
Checking the Coupling
Here the backlash between coupling cams and the flexible spider must be
checked by a feeler gauge (see sketch 1).
When reaching the limit of
wear of max.
friction, the spider must be exchan-
ged immediately, independent of the inspection intervals.
The wear limit is at 3 mm!
In addition a visual inspection as to the presence of any damage needs to be
done. If damaged, the coupling must be replaced.
5.7
Replacing the Outer Shaft Seal
Required tools:
Allen keys 3 mm, 5 mm, 8 mm, flat-nose pliers, plastic hammer, shaft seal
driver, possibly puller for coupling.
The TRIVAC NT has two shaft seals; the outer one is subject to greater wear.
Oil marks under the coupling housing are signs of a damaged outer shaft
seal.
The outer shaft seal (5.2/8) can be replaced without removing or disassemb-
ling the pump module.
Shutdown the pump.
Drain the oil (see Section 5.2) or place the pump on its front side.
Unscrew the four not counter-sunk hexagon socket screws at the intermedia-
te flange and detach the motor with the intermediate flange.
Remove the coupling element (5.2/1).
Remove the hex. socket screw (5.2/2) and the spring washer (5.2/3).
Pull off the coupling (5.2/4). Remove the key (5.2/5).
Maintenance
Sketch 1 Checking the wear limit
Hub 1
Spider
Feeler gauge
Hub 2
