Impeller Outside Diameter (O.d.) Repair Procedure; Balancing - Hamilton Jet HJ212 Installation And Service Manual

Overhaul

Impeller outside diameter (O.D.) repair procedure

If the impeller OD is excessively worn it can be built up by welding.
After welding, turn on a mandrel to the correct OD. Use light cuts to avoid blade distortion.
Dress the faces back flush with the original surfaces.
File and polish.
Standard impeller diameter
New max diameter
214.75
Turbo impeller diameter
New Max Diameter
214.4

Balancing

The impeller must be balanced if any welding or grinding has been done.
Balance the impeller statically, on a suitable mandrel set on horizontal knife edges or bars to within the
maximum out of balance specified. Balance weights of 316 stainless steel may be welded to the inside of the
impeller hub and grinding is permitted.
Single impeller:
Static balance to within 38gm-cm.

Balance weights of 316SS may be welded to the inside of the hub and grinding is permitted.

Turbo impeller (rear):
Static balance to within 6.2gm-cm.

Balance weights of 316SS may be welded to the inside of the hub and grinding is permitted.

Turbo impeller (complete):
Static balance to within 11.5gm-cm.

Balance weights of 316SS may be welded to the inside of the hub and grinding is permitted.

New min diameter
214.60
New Min Diameter
214.3
Worn min diameter
214.1
Worn Min Diameter
213.8
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Installation and Service Manual