INOXPA HLR, Installation, Service And Maintenance Instructions

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(A) 2021/11 7.Maintenance 25
Pumps size 0-1 Pumps size 2 Pumps size 3-4
Pumps Size 0, 1, and 2: the adjustable fixing mechanism consists of three
pieces: Allen screws (51A), bearing cones (65A), and impeller bushing (17B).
Pumps Size 3 and 4: the adjustable fixing mechanism is a single piece (65).
Position 1 Position 2
• Slide the lobes (02) over the shafts (05 and 05A) as indicated
in
7.5.5 Lobe assembly
• Turn the lobes to the position indicated in position 1 until the
gap is as indicated in
7.6.1. Clearance and tolerance table
• Tighten manually several tightening screws in the adjustable
fixing mechanism.
• Then turn the left lobe about 60 o in anti-clockwise direction
(position 2). Check that the gap in this position is equal to the
position 1. If not, these gaps should be equalised by turning
one lobe slightly while holding the other still.
• Tighten the tightening screws of the adjustable fixing mechanism diagonally by 2 or 3 turns with the established tightening
torque.
• When tightening the screws of the adjustable fixing mechanism, ensure that the gears (19 and 19A) do not turn in relation
to each other. This can be avoided by placing a wooden wedge between the gears (19 and 19A).
•
Check again the gap between the lobes (02) and turn the driveshaft (05) a few times in order to check that the lobes (02)
do not rub against one another at any point.
• Remove the lobes (02) from the shafts (05 and 05A).
• Apply a little lubricant to the driveshaft (05) at the location of the retainer (88) once assembly is finished.
7.6.3.
Lobe/Pump Rotor case adjustment using shims
• This is the final adjustment to be carried out. The pump must be
synchronised and the pump rotor case must be mounted on the
gear case.
Pumps Size 0:
• Due to its small size, and the low assembly tolerances, this pump
does not use shims. The length of the sleeves (13) must be
adjusted for each pump.
Pumps Size 1, 2, 3, 4:
• The adjustment is made using ring-shaped shims (32) placed
between shaft (05 and 05A) and the lobe (02).
• There are 3 different shim thicknesses (0,1, 0,15 and 0,2 mm).
• Mount the lobes (02) and tighten the screws (25) as described in
7.5.5. Lobe assembly .
• Check the tolerances between the lobe and rotor case (A and B).
See
7.6.1. Clearance and tolerance table
. If they are out of
range, change the shims until the necessary clearance is
achieved.