Gorman-Rupp Pumps 86A2-F4L 1322538 and up - Manual (Page 33)

OM-00957 80 SERIES
MAINTENANCE & REPAIR PAGE E - 13
Slide the seal spacer washer (15) onto the shaft
with the chamfered side facing the shaft shoulder.
Reinstall the automatic grease cup and piping (16,
17 and 18) in the seal plate. After the impeller has
been installed, lubricate the seal as indicated in
LUBRICATION.
Impeller Installation
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (13) as previously removed and screw the
impeller onto the shaft until tight.
The shaft and impeller threads must be
completely clean before reinstalling the im­
peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im­
peller or shaft.
A clearance of .020 to .040 inch (0,5 to 1,0 mm) be­
tween the impeller and the seal plate is recom­
mended for maximum pump efficiency. Measure
this clearance and add or subtract impeller shims
until it is reached.
NOTE
The seal plate must be tight against the intermedi­
ate while setting the back impeller clearance.
Securing Intermediate And Drive Assembly To
Engine
(Figure 3)
Install the shaft key (24, Figure 2) in the shaft key­
way. Position the flexible portion of the coupling as­
sembly (3) on the shaft as shown in Figure 3.
NOTE
The flexible portion of the coupling must be proper­
ly positioned on the shaft. The heads of the caps­
crews in the center of the coupling must be posi­
tioned toward the pump end of the shaft.
Align the keyway in the bushing (2) with the shaft
key, and slide it onto the shaft until it is just flush
with the end of the shaft. Rotate the flexible portion
of the coupling until the tapped holes for the two
setscrews align with those in the bushing, and in­
stall the setscrews.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 3.
This is critical.
If the coupling is not prop­
erly positioned on the shaft, the coupling
parts may not fully engage, or a pre‐load
condition can cause premature bearing
failure.
The end of the shaft must be just flush with
the face of the bushing. This will allow the
two portions of the coupling to fully engage
when the intermediate is secured to the en­
gine bellhousing, without pre‐loading the
bearings.
With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 14.6 ft. lbs. (175 in. lbs. or 2,02 m.
kg.).
If the complete coupling assembly is being re­
placed, apply `Loctite Retaining Compound No.
242' or equivalent compound to the threads of the
hardware (4 and 5), and secure the outer ring of the
coupling to the engine flywheel by torquing the
hardware to 45 ft. lbs. (540 in. lbs. or 6,2 m. kg.).
Using a suitable lifting device, position the interme­
diate (21, Figure 2) so the flexible portion of the
coupling seats inside the outer ring attached to the
engine flywheel.
NOTE
To ease installation, lightly lubricate the rubber por­
tion of the coupling with a non‐petroleum based
lubricant such as vegetable oil or glycerin, or a sili­
con‐based lubricant such as “WD40” or equivalent.
Do not use petroleum‐based lubricants, or any oth­
er substance which may soften or otherwise dam­
age the rubber.