HPXM USER INSTRUCTIONS ENGLISH 14983571 - 03/11
Page 37 of 48
Figure 6.7
i) Place bearing housing in a horizontal position
suitably supported. Fit new o-rings into the
grooves on each labyrinth. Working from the
coupling end of the shaft the smaller labyrinth
over the shaft and press into the bearing housing
until it locates against the machined shoulder. It
is held in place by the o-ring - no further fixing is
required. Repeat the operation for the other
labyrinth, working from the impeller end of shaft.
j) Install both the deflectors (impeller and coupling
end) onto shaft. Position flingers approximately 1
mm (0.040 in.) from their respective labyrinth and
secure with appropriate clamping screws.
k) Check the axial play of the shaft, it must be
limited between 0.05 mm (0.002 in.) and 0.100
mm (0.004 in.)
6.9.3 Shaft seal
6.9.3.1 Shaft seal – mechanical seal
a) Fit new gasket in face of mechanical seal gland
plate. Refit mechanical seal cartridge over the 4
gland studs on the casing cover ensuring correct
orientation of the gland tappings (refer to
mechanical seal assembly drawing). Secure with
four nuts tightened to the torque specified in
section 6.6.
b) Rig bearing housing assembly to hoist impeller
end and shaft downwards. Carefully lower shaft
end through seal sleeve until bearing housing
locates on casing cover.
c) Secure bearing housing to cover.
d) Retighten mechanical seal drive collar set screws.
Move setting plates from "transit" to "run"
position. Refit screwed piping into mechanical
seal gland plates.
Refer to any special instructions supplied with
the mechanical seal.
6.9.4 Casing assembly
a) For non-inducer machines install key and
impeller. Install locking nut - noting left hand
thread form. Torque nut to correct tightness. Fit
and tighten lockscrew on end of locknut throat
bush (if fitted).
b) Install a new spiral wound gasket into position on
casing cover.
c) Rig assembly with lifting straps to an overhead
hoist and carefully install the assembled pumping
element into the casing.
Use care when installing pumping
element to avoid damage to the gasket.
d) Install nuts on casing cover to casing studs.
Torque nuts evenly to correct tightness. (See
Section 6.6).
e) Install coupling key and coupling hub onto the
pump shaft.
The coupling hub has a shrink fit to
the pump shaft. The use of heat and an
approved press/puller will be required to
install it. Install the pump half coupling hub
by heating to approximately 149 °C (300 °F) in
successive stages from periphery of hub
toward the centre. NEVER APPLY AN OPEN
FLAME TO THE COUPLING HUB TEETH.
f) Re-install drain plug and fill the bearing housing
to the prescribed level with fresh lubricating oil.
(See Section 5.1.1).
g) Check to see if rotor runs freely by turning the
shaft with a strap wrench or by hand. Make any
corrections or adjustments.
h) Check driver rotation. Driver rotation must
coincide with direction indicated by arrow on
pump.
i) Align pump - motor coupling per "ALIGNMENT"
instructions and install spacer piece. Install
coupling guard.
j) Replace all auxiliary piping.
