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ATTENTION
Do not fit gear (6) on HP3 and LH7 models.
Note: For HP3 and LH7 models.
•
Once bearing nuts are to the correct torque in
Table 8 repeat the stages in the 7 bullet
points above to fit the gear drive keys (28),
gears (6), tab washers (7) and gear nuts (8).
Ensure that the timing marks (Figure 36) are
aligned.
Once the Shaft, Bearing and Gear Nut assembly is
complete the bearing housing can be rebuilt as
follows:
•
Front oil seals (23) should be pressed in, until
they are flush with the front face of the
bearing housing (1). Take care not to
curl/damage the lip or displace the gaiter
spring on the shaft.
•
Ensure they are square to the shaft (not
tilted).
•
Assemble the gear cover (11) to the bearing
housing (1), using the new gasket (9), new
rear oil seals (20) and gear cover screw seals
(19). Be careful not to damage the lip seal on
the drive shaft keyway. Tighten the gear
cover screws to the torque shown in Table 1
(3.3 LOCATION & ORIENTATION)
•
Ensure the vent plug (12) is at the highest
point, the sight glass (13) on the side of the
cover and the oil drain outlet at the lowest
point and sealed with suitable thread sealant.
•
Re-fit the seal housings if removed, rotor case,
seals, rotors and end cover as described in
section 6. Remember to check the rotor
clearances
(6.8
CHECKING & ADJUSTMENT).
•
Fill the gearbox with the correct grade and
quantity of oil. (3.14 LUBRICATION)
•
This should be to the centre of the sight glass
(13).
•
Some oil may be retained in the sight glass
and will give a false impression of the oil level.
Be sure that the sight glass is full of oil to its
centre.
ROTOR
CLEARANCE
7
ATEX APPLICATIONS
General
This supplement applies to the HP & LH Rotary
Lobe Pumps used in applications covered by the
ATEX Directive 2014/34/EC.
Protection Class
II 2 GD c Tx
Temperature
1
processes media refers to section 'Maximum
Surface Temperature' in below text.
Safety Zones Applicable
Zone 1, 2, 21 & 22
The baseplate of the pump must be earthed
in order to prevent a build-up of static
electricity.
Maximum Surface Temperature
ATTENTION
The maximum surface temperature of the HP &
LH is dependent upon the temperature of the
media processed by the pump.
The
table
shows
temperature of the processed fluid within the
pump in order to ensure that the maximum
surface temperature of components does not
exceed the corresponding temperature class.
-
Temperature
Class
T1
T2
T3
T4
Table 8 - Temperature class
HP & LH Rotary Lobe Pumps are limited to a
processed fluid temperature of maximum 140°C.
1
class
depending
upon
the
maximum
Maximum
Maximum
Surface
Temperature
Temperature
of Processed
Fluid
450°C
300°C
200°C
140°C
135°C
85°C
the
permitted
N/A
N/A
36
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