Rietschle Thomas DRUVAC KTA 40/4 Instructions De Service page 7

M
Maintenance and Servicing
When maintaining these units and having such situations where personnel could be hurt by moving parts or by live electrical parts
the pump must be isolated by totally disconnecting the electrical supply. It is imperative that the unit cannot be re-started during
the maintenance operation. Do not maintain a pump that is at its normal operating temperature as there is a danger from hot parts.
1. Lubrication (picture )
The bearings must be greased at the 2 greasing points (L) with 6 g per point, after the following recommended operating hours or at the latest one
year operation:
50 Hz: KTA 60-100 ➝ 10,000 hr and KTA 140 ➝ 6,000 hr
60 Hz: KTA 60-80 ➝ 10,000 hr, KTA 100 ➝ 8,000 hr and KTA 140 ➝ 4,000 hr
Note! These greasing instructions are valid for operation at 20° C ambient temperature. At 40° C these should be reduced by 50 %.
The suction grid (G) must be removed for greasing.
We recommend the following grease types: Klüber Petamo GY 193 or equivalent greases (see label for recommended grease (M)).
Pressure/vacuum pumps without greasing points need not be greased. These units use sealed for life bearings.
2. Blades (pictures and )
Checking blades: KTA /4 models have 6 carbon blades which have a low but permanent wear factor.
First check after 4,000 operating hours, thereafter every 1,000 operating hours they should be checked against the height (X).
Remove suction grid (G). To remove the end cover (b) from the housing, the bolt (a) located in the centre of the bearing cover (c) should be removed.
To achieve this one of the fixing bolts (s) from the housing cover should be screwed into the thread in the centre of the bearing cover (c). All blades
must have a minimum height (X) of bigger than 27 mm (KTA 40 and KTA 50) and 38 mm (KTA 60-140).
Blades must be changed completely.
Changing blades: If the minimum height (X) is reached then the whole set of blades should be changed.
Under no circumstances should the coloured slotted nuts (w
Before refitting the blades clean out the housing and the rotor slots with compressed air. Place the blades, with the radius outwards (Y), such that
the bevel is in the direction of rotation (O
Before refitting the end cover (b) redistribute the grease from the bearing cover (c) on to the appropriate bearing. It is important that the shaft end
is completely clean so that no grease can enter the housing, this could mix together with carbon dust and give a viscous paste which would result
in the blades becoming stuck in the rotor slots.
Note! Care should be taken that the bearing does not become contaminated.
When re-fitting the end cover (b) tighten the bolts evenly so that the end cover fits correctly onto the fixing pins. As soon as the cover is almost
touching the housing, we recommend during further tightening of the bolts, the fan is moved in both directions. This can be achieved by taking the
grill at the cooling air exit (F) away. This then ensures that the blades are sitting correctly in their slots and avoids any edge damage.
Refit the suction grid (G).
3. Cooling (pictures and
The space between the cooling fins and cooling pipes may become clogged by dust. They can be cleaned, by blowing out with compressed
air, after removing the suction grid (G) and the cover cap (G
L
L
G
) and corresponds with the radius of the housing (Z).
1
)
1
Z
X
O
1
c
a
s
) be removed from the housing cover (b). (see M 12)
1
).
Y
b
d
G
1