Replacing The Bearings - Atlas Copco JS Serie Instructions Pour L'utilisation Et L'entretien

13.6 Replacing type 4 - 5 cartridge seals (fig. 10, 13, 14, 15, 16)
- Drain the pump casing as described
in paragraph 7.
Attention: residual liquid may be
found inside the pump casing, head
and suction line; take all necessary
precautions if the liquid is hazardous
(inflammable, corrosive, poisonous,
infected, etc.)
- Unscrew the nuts (52) (fig. 10) and
remove the pump casing,
care not to damage the casing
gasket (43)
- Block the impeller (03) and remove
the self-locking impeller nut (33)
- Remove the impeller
- Disconnect the flushing lines.
- Fix the seal lock setting plates (25.4)
in their seats (fig. 13)
- Loosen the grub screws of the
shaft sleeve (fig. 14)
- Unscrew the screws (20.2) which
fix the seal flange to the head (fig.15)
- Remove the head (19)
- Remove the seal (25), the shaft
sleeve (31), the seal box (20) and
the gasket (20.1)
- If the gasket (20.1) is damaged, replace it.
To assemble, proceed in reverse order
- To facilitate the initial assembly of the seal (fig. 16), smear a little oil on the shaft sleeve (31)
- Tighten the fixing screws (20.2) carefully (fig. 15) so as to avoid strain on the stationary seat of the seal
- Tighten the grub screws as far as they will go (fig. 14)
- Remove the setting plates (25.4) which hold the seal (fig. 13) and fix them in the appropriate holes in the flange so that they can be
used again to remove the seal
- Reconnect the flushing lines, begin flushing and bleed out air from the area around the seal. The seal must not run dry even for a
few moments.
13.7 Positioning the impeller with reference to the wear plate(s)
- In all models, the distance between
the top of the impeller blades and
the surface of the wear plate must
be between 0.3 - 0.6 mm (fig. 19).
For the 12" model, the distance
between the impeller and the front
and rear wear plates must be
between 0.6 - 1 mm (fig. 22). To
achieve this, dimensions A and B in
figs. 17, 18, 20, 21 must be as nearly
as possible equal. To this end, use
the shims (25.2) (fig. 11) supplied
with spare mechanical seals. These
shims are used to move the impeller
further forward if it is too far from
the front wear plate or too near the
rear wear plate. The shims should be
mounted between the seal support
ring (25.1) (fig. 11) and the impeller.
Further adjustments can be carried
out using casing gaskets (and rear
wear plate gaskets on models which
fit these). The presence of the casing
gasket (43) (fig. 10) 0.5 mm thick
then creates the correct distance
(fig. 19).
13.8 Maintenance of the bearings (fig. 10)
The pump is supplied with the bearings already greased and does not require maintenance for the first 500 hours of operation.
The bearings in the bearing housing must be lubricated appropriately, avoiding the use of too much grease which can cause overheating
and, as a result, damage to the bearings. NOTE: consult ANNEX 1 on page 52 for the JP/JE, FT series, monobloc versions -
ANNEX 1A on page 55 for the JP/JE, ET series, monobloc versions.
13.9

Replacing the bearings

- Drain the pump casing as described in paragraph 7.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
- Remove the casing, the head and the mechanical seal
- Remove the flexible coupling hub and the shaft key
- Remove the outer bearing cover (08)
- Extract the shaft from the coupling side
- Extract the bearings using a bearing extractor
- To reassemble, proceed in reverse order.
18
18
flushing hole
taking
fig. 13
fig. 15
fig. 17
www.northridgepumps.com
/ JS
JS / JP / JE / JO / JT
flushing
hole fig. 14
fig. 16
fig. 18
fig. 20
impeller
fig. 21
impeller
fig. 19
wear
plate
wear
plates
fig. 22