Flowserve Guardian Sealless Metallic - Manual (Page 54)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11
Page 54 of 68 flowserve.com
d) Turn the jackscrews [6575] counterclockwise to
allow the outer magnet/motor assembly to slide
over the containment shell [224]. Turn the
screws one to two turns in an alternating pattern
to prevent binding.
e) Back out jackscrews until the lantern [3132] butts
up to the motor flange [251]. Make sure that the
lantern and motor flange sit flat against one
another. Insert the four (4) motor flange/lantern
fasteners [6570.10] and tighten them in an
alternating pattern. Make sure the jackscrews
[6575] do not interfere with the tightening of these
bolts.
6.9.4
Adjusting the Impeller
a) Temporarily tighten the impeller [2200] to the
pump shaft [2100.1]. Turn the impeller in a
clockwise direction until the impeller is firmly
seated but only hand tight.
Do not attempt to tighten the
impeller on the shaft by hitting the impeller with a
hammer or by inserting a pry bar between the
impeller vanes. Serious damage to the impeller
may result from these actions.
b) Place the entire assembly vertically on the
workbench with the impeller down and supporting
the weight of the assembly. Measure the minimum
clearance between the bearing holder face [3830]
and the impeller [2200] with a feeler gauge without
forcing the impeller away from the face. Measure
the clearance between the bearing holder and ALL
THE VANES to determine closest vane. Use the
smallest measurement as your guide and record
this number.
c) The Guardian Magnetic Drive requires a
clearance of 0.45 mm (0.018 in.) ± 0.08 mm
(0.003 in.), regardless of operating temperature,
between the closest impeller vane and the face of
the bearing holder. Determine the number of
shims that must be placed between the impeller
and the thrust collar by subtracting the minimum
clearance between the bearing holder and the
impeller from the thickness of the impeller shims
already inserted. Add 0.45 mm (0.018 in.) to this
difference. This number is the thickness of shims
that are required to adjust the impeller.
For example, if the initial measurement between
the closest impeller vane and the bearing holder
face is 0.75 mm (0.030 in.), and the thickness of
the shims already inserted is 1.00 mm (0.040 in.),
subtract
0.75 mm (0.030 in.) from 1.00 mm (0.040 in.).
1.00 mm – 0.75 mm = 0.25 mm
(0.040 in. – 0.030 in. = 0.010 in.)
Next, add 0.45 mm (0.018 in.) to 0.25 mm
(0.010 in.) to determine the thickness of the
shims required to adjust the impeller properly.
0.25 mm + 0.45 mm = 0.70 mm
(0.010 in. + 0.018 in. = 0.028 in.)
A combination of shims equal to 0.70 mm
(0.028 in.) thickness would then be required to
set the impeller properly.
d) Set the assembly back to horizontal. Remove
the impeller and the 1.00 mm (0.040 in.)
combination of shims from the pump shaft.
Removal should only require using your hands
since the impeller was only hand tightened. If
necessary, use the Durco impeller wrench to hold
the shaft stationary.
e) Place the required number of shims against the
shoulder in the thrust collar [3610] or thrust collar
ring [207]. Thread the impeller back onto the pump
shaft and tighten as described in step a). Make sure
the shims sit flat between mating faces.
f) Recheck the impeller clearance as described in
step b). If the distance is more or less than
required, repeat steps c) thru f) until clearance is
correct.
g) When the clearance is properly set, set the
assembly back to horizontal. Remove the
impeller and thrust collar [3610].
Group 1. Place the thrust collar/pump shaft
O-ring [4610.4] in the groove on the back side of
the thrust collar. Stretch the thrust collar ring/
O-ring [4610.5] over the hub on the backside of
the impeller.
Group 2. Remove the thrust collar ring and
shims from the thrust collar. Place the thrust
collar/ring O-ring [4610.5] into the O-ring groove
on the shimming side of the thrust collar. Using
an arbor press, press the thrust collar ring and
shims into the thrust collar. In order to keep the
shims from falling out of the thrust collar during
this press, the ring should be placed on the work
surface with the thrust collar on top of it. Place
the thrust collar/pump shaft O-ring [4610.4] into
the groove on the pump shaft side of the thrust
collar. Place the thrust collar into the bearing
holder [3830] so the thrust journal sits flat on the
grooved portion of the T-shaped bushing [212].
h) Install new impeller gasket [4590.2] and tighten
the impeller until it is firmly seated.
Failure to tighten the impeller
sufficiently may allow liquid to reach the impeller
thread. Additionally, a loose impeller will be
tightened when the pump is started, but may be
very difficult to remove later.