Gorman-Rupp Pumps 610M20B-B 699260 and up - Manual (Page 29)

OM−01912 60 SERIES
MAINTENANCE & REPAIR PAGE E − 11
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 four
places, equally spaced at the vanes. After welding,
dynamically balance the impeller assembly per
plane 0.2−0.3 oz./in. (5.7−8.5 g./in.).
Install the key (55) in the keyway so the end of the
key projects no more than 1/8−inch (3,2 mm) be-
yond the end of the shaft with the key positioned as
far toward the seal as possible.
Press the impeller assembly onto the shaft until ful-
ly seated. Install the impeller washer (55) so it seats
over the projecting end of the shaft key.
Apply Never-Seez" or equivalent compound to the
shaft threads and screw the impeller nut onto the
shaft. Immobilize the impeller, and torque the nut to
200 ft. lbs. (27,6 m. kg.)
Torque the setscrews (53) to 18 ft. lbs. (216 in. lbs.
or 2,49 m. kg.) Reinstall the inserts (53).
Pump Casing Installation
Install the casing gasket (9) over the pump casing
studs (40). Use a suitable hoist and sling to posi-
tion the casing over the impeller and slide the studs
through the seal plate and pedestal mounting
holes.
Secure the casing with the nuts (41).
Suction Plate And Wear Ring Installation
Install a new O-ring (44) in the groove in the wear
ring (47) and lubricate it with light grease.
Screw the jam nuts (60) onto the studs (59) until
they seat against the pump casing. Position the
wear ring on the studs. Install the nuts (58) on the
studs. Tighten the nuts evenly in an alternating pat-
tern until the wear ring seats against the impeller.
Unscrew the nuts (60) until they seat against wear
ring. Unscrew each nut 1/2 to 3/4 turn more in an
alternating pattern.
The clearance between the wear ring and the im-
peller wear ring should be approximately 0.015
inch (0,38 mm). Measure this clearance and use
the jam nuts (60) and locking nuts (58) to move the
wear ring to achieve the proper clearance. When
the correct clearance has been achieved, secure
the wear ring by tightening both the locking nuts
and jam nuts against the wear ring.
Install the suction head O-ring (49) in the groove in
the suction head and coat it with light grease. Posi-
tion the suction head in the wear ring bore and use
a soft-faced mallet to tap it into the wear ring until
fully seated.
Rotate the impeller shaft by hand to check for
scraping or binding and correct any before putting
the pump back into service.
LUBRICATION
Seal Assembly
Fill the bottle oiler (12) with SAE No. 30 non-deter-
gent oil. Check the oil level regularly and refill as re-
quired.
Bearings
The pedestal was fully lubricated when shipped
from the factory. Check the oil level regularly
through the sight gauges (32)
and maintain it at the
midpoint of the gauges. When lubrication is re-
quired, remove the vented plug (22) and add SAE
No. 30 non-detergent oil through the opening.
Clean and reinstall the vented plug. Do not over-lu-
bricate. Over-lubrication can cause the bearings to
over-heat, resulting in premature bearing failure.
NOTE
The white reflector in the sight gauge must be posi-
tioned horizontally to provide proper drainage.
Under normal conditions, drain the bearing hous-
ing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated con-
tinuously or installed in an environment with rapid
temperature change.