Gorman-Rupp Pumps 612L20B-B 806819 and up - Manual (Page 30)

OM-01919 60 SERIES
MAINTENANCE & REPAIR PAGE E - 11
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the lu­
bricated shaft until the seal elements contact. In­
stall the seal spring.
Reinstall the air vent and piping (6, 7 and 8) and
bottle oiler and piping (9, 10 and 11). Lubricate the
seal assembly as indicated in LUBRICATION, af­
ter the impeller is installed.
Impeller Installation
Inspect the impeller for excessive wear, damage or
cracks and replace as required.
Install the woodruff key (54) and press the impeller
onto the shaft until fully seated.
Remove the setscrews (49) from the impeller nut
(51). Apply “Never‐Seez” or equivalent compound
to the shaft threads and screw the impeller nut onto
the shaft. Immobilize the impeller as shown in Fig­
ure E-2, and torque the impeller nut to 300 ft. Lbs.
(42 m. kg.).
Apply “Loctite No. 242” or equivalent compound to
the setscrews (49). Install new inserts (50), and
torque the setscrews to 18 ft. lbs. (216 in. lbs. or 2,5
m. kg.).
Pump Casing Installation
Replace the pump casing gasket (38). Slide the
pump casing over the impeller and secure it to the
seal plate and pedestal with the hardware (5 and
37).
Suction Plate and Wear Ring Installation and
Adjustment
Replace the wear ring O‐ring (47) and lubricate it
with light oil or grease. Slide the wear ring (53) into
the pump casing and secure it with the hardware
(46).
Replace the suction plate O‐ring (48) and lubricate
it with light oil or grease. Slide the suction plate (52)
into the wear ring. Use a soft‐faced mallet to tap the
suction plate into the wear ring until fully seated.
A clearance approximately .015 inch (35 mm) be­
tween the impeller and the wear ring (53) is recom­
mended for maximum pump efficiency. This clear­
ance may be measured through the suction port
with feeler gauges and can be adjusted using the
jam nuts (45) and hex nuts (46).
Loosen the hex nuts (46) and tighten the jam nuts
(45) until the war ring touches evenly around the
suction plate. Loosen the jam nuts until they con­
tact the volute. Tighten the hex nuts evenly, not
more than 1/2 turn at a time, until the wear ring
touches the impeller when the shaft is turned by
hand. Loosen the hex nuts 1/2 turn, then tighten
the jam nuts until the wear ring is pushed back
against the hex nuts. This will provide the recom­
mended .015 inch (35 mm) clearance.
Final Pump Assembly
Be sure the pump and power source are securely
mounted to the base and that they are properly
aligned. If used, remove the eye bolt used to lift
component parts.
Fill the pump casing with clean liquid.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure. Open all the
valves in the suction and discharge lines.
Be sure the pump and power source have been
properly lubricated, see LUBRICATION.
Refer to OPERATION, Section C, before putting
the pump back into service.
LUBRICATION
Seal Assembly
Fill the seal bottle oiler (9) with SAE No. 30 non‐det­
ergent oil. Check the oil level regularly and refill as
required.
Periodically clean and reinstall the seal cavity air
vent (7).
Bearings
The pedestal was fully lubricated when shipped
from the factory. Check the oil level regularly and
maintain it at the midpoint of the sight gauge (27).
When lubrication is required, unscrew the vented
plug (17) and fill the pedestal with SAE No. 30 non‐
detergent oil to the middle of the sight gauge (27).
Do not overfill. Over‐lubrication can cause the
bearings to over‐heat, resulting in premature bear­
ing failure. Clean and reinstall the vented plug.