Gorman-Rupp Pumps 612M60-B 1453214 and up - Manual (Page 30)

OM−04407 60 SERIES
MAINTENANCE & REPAIR PAGE E − 11
quires machining and dynamic balancing
the impeller assembly after the wear ring is
welded to the impeller. Failure to properly
install the wear ring and machine and bal-
ance the impeller assembly can result in
premature shaft, seal or bearing failure, or
other damage to the pump.
Inspect the impeller, and replace it if cracked or
badly worn. If the wear ring (4) was removed, chill
the impeller by refrigeration and use an induction
heater or oven to heat the new wear ring. Slide the
wear ring onto the impeller until fully seated against
the shoulder and allow it to cool.
The wear ring must seat squarely on the
impeller; otherwise binding and/or exces-
sive wear will occur. Use caution when han-
dling hot parts to prevent burns.
Spot weld the wear ring to the impeller at three
places, equally spaced at the vanes. After welding,
machine the wear ring as shown in Figure 2.
The impeller assembly must be machined
and balanced as shown in Figure 2. Other-
wise, premature shaft, seal or bearing fail-
ure, or other damage to the pump may oc-
cur.
After machining, dynamically balance the impeller
assembly per plane 1.05 oz./in. (11.7 g/cm).
Install the same thickness of impeller adjusting
shims (6) as previously removed. Install the shaft
key (42) and press the impeller assembly onto the
shaft until fully seated.
A clearance of approximately .015 inch (0,38 mm)
between the impeller and the seal plate is recom-
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust-
ing shims as required.
After the impeller clearance has been set, align the
pin in the impeller washer (40) with the hole in the
impeller and install the washer. Apply Never-
Seez" or equivalent compound on the threads of
the impeller capscrew (41). Immobilize the shaft
and secure the the impeller by torquing the caps-
crew to 225 ft. lbs. (2700 in. lbs. or 31 m. kg.).
Pump Casing Installation
Install the casing gasket (9) over the pump casing
studs (10). Remove the hardware temporarily se-
curing the seal plate to the pedestal. Use a suitable
hoist and sling to position the volute over the impel-
ler and slide the studs through the seal plate and
pedestal mounting holes.
Install the bottle oiler bracket (63) over the volute
studs. Secure the bracket and volute casing with
the hardware (11, 12, 35, 58 and 59). Reconnect
the hose (65) to the connector (64) in the seal plate
and secure it with the hose clamp (66).
Reinstall the air vent and piping (54, 55 and 56) in
the seal plate.
Suction Head And Wear Ring Installation
If the wear ring (38) was removed, chill the wear
ring by refrigeration and heat the suction head.
Slide the wear ring into the suction head until fully
seated and allow it to cool.
The wear ring must seat squarely in the
suction head; otherwise binding and/or ex-
cessive wear will occur. Use caution when
handling hot parts to prevent burns.
The wear ring is secured to the suction head with
the spiral pins (39). Drill three evenly spaced
3/16-inch diameter x 3/4-inch deep holes through
the wear ring and into the suction head. Tap the
spiral pins into the holes until fully seated.
Install the suction head gasket (48). Position the
suction head over the studs (45) and secure it with
the hardware (46 and 47).