Gorman-Rupp Pumps 04B3-F4L 1242057 thru 1316965 - Manual (Page 32)

OM--01216 0 SERIES
MAINTENANCE & REPAIR PAGE E -- 11
endplay, and secure the bearing retaining nut with
the setscrew (16).
NOTE
Impeller shaft endplay should be between .002 and
.010 inch (0,05 mm to 0,25 mm). Adjust the bearing
retaining nut to obtain the correct endplay.
Securing Intermediate and Drive Assembly To
Engine
(Figure 3)
If removed, apply a thin coating of ‘Never-Seez’ (or
equivalent) lubricant to the inside diameter of the
replacement pilot bushing (1) and press it into the
flywheel until fully seated.
Install the shaft key (18, Figure 2) in the shaft key-
way. Position the flexible portion of the coupling as-
sembly (4) 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 (3) with the shaft
key, and slide it onto the shaft to the dimension
shown in Figure 3.
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 flexible portion of the coupling, shaft
key and bushing
must be positioned on
the shaft to the dimension shown in Figure
3. This will allow the two portions of the
coupling to fully engage when the interme-
diate is secured to the engine bellhousing,
without pre-loading the bearing or pilot
bushing.
Rotate the flexible portion of the coupling until the
tapped holes for the two setscrews align with those
in the bushing, and install the setscrews.
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 175 in. lbs. (2 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 (5 and 6), 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 as-
sembled intermediate and flexible portion of the
coupling so 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.
Secure the intermediate to the engine bellhousing
with the previously removed hardware (7 and 8).
Seal Reassembly and Installation
(Figures 2 and 5)
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.