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6 Maintenance
Alarm source
Action
Overload protection Check that the impeller can rotate freely.
6.3 Replace the impeller
Required tools:
• 6 hexagon bit adapter with an extension of at least 125 mm (4.92
in.)
• Impeller puller
If applicable, contact your local sales and service representative for
correct type and size.
• Rod (wood or copper) for locking the impeller in place, if applica-
ble.
• Two crowbars, if applicable
NOTICE:
• When laying the pump on its side, do not allow the weight of the
pump to rest on any portion of the impeller. The impeller must not
be allowed to make contact with the concrete floor or other hard
and rough surfaces.
CAUTION: Cutting Hazard
Worn parts can have sharp edges. Wear protective clothing.
6.3.1 Remove the impeller: Non-clog and Vortex (H, M)
The instruction applies to pumps equipped with a Non-clog impeller or
a Vortex impeller with pressure class H or M.
1. Remove the suction cover:
a) Place the pump horizontally.
b) Remove the suction cover screws.
c) Remove the suction cover from the pump housing.
2. Remove the impeller:
a) Remove the impeller screw.
b) Remove the impeller and the conical sleeve.
6.3.2 Remove the impeller: Vortex (L)
This instruction applies to pumps equipped with a Vortex impeller with
pressure class L.
1. Remove the pump housing:
a) Remove the pump housing screws.
b) Lift off the drive unit from the pump housing.
2. Remove the impeller:
a) Place the drive unit horizontally.
b) Remove the impeller screw.
c) Remove the impeller, the washer, and the conical sleeve.
6.3.3 Install the impeller
1. Prepare the shaft:
a) Polish off any flaws with a fine emery cloth.
The end of the shaft must be clean and free from burrs.
b) Coat the inner conic, the outer cylindrical surfaces, and the
thread of the conical sleeve with a thin layer of grease.
14
The proper lubrication is grease for bearings, for example Exxon
Mobil Unirex N3, Mobil Mobilith SHC 220 or equivalent.
NOTICE:
Surplus grease can cause the impeller to become loose. Remove
surplus grease from conical and/or cylindrical surfaces of shafts
and/or sleeves.
2. Lubricate the threads of the impeller screw and the washer, if any.
3. Fit the impeller.
Impeller type
Action
Non-clog
Fit the conical sleeve, the washer, and the impel-
ler screw to the shaft.
Vortex (H) (M) (L) 1. Fit the conical sleeve to the shaft.
2. Fit the impeller and impeller screw to the
shaft.
Figure 10: Non-clog impeller
Figure 11: Vortex (H,M)
GFK-GFV Series Installation, Operation, and Maintenance Manual
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