Gorman-Rupp Pumps PA6F60-4045T 1521221 and up - Manual (Page 40)

PA SERIES OM-06189
MAINTENANCE & REPAIR PAGE E - 18
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 recessed
0.25 inch (6,3 mm) from the face of the
bushing. This will allow the two portions of
the coupling to fully engage when the en­
gine bracket is secured to the engine bell­
housing 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 m.
kg.).
If the complete coupling assembly is being re­
placed, apply `Loctite Retaining Compound No.
242' or equivalent 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 pump
frame so the flexible portion of the coupling seats
inside the outer ring attached to the engine fly­
wheel.
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 engine bracket to the engine bellhous­
ing with the hardware (6 and 7).
Seal Reassembly and Installation
(Figures 4 and 8)
Clean the bore of the back plate (6) and shaft (15)
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.
Lay the back plate on a flat surface with the impeller
side down. Press the oil seal (7) into the back plate
with the lip positioned as shown in Figure 4.
The seal is not normally reused because wear pat­
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer­
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non‐oil based solvent and a clean, lint‐free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak­
age. Clean and polish the shaft sleeve, or replace it
if there are nicks or cuts on either end. If any com­
ponents are worn, replace the complete seal;
never mix old and new seal parts.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
To ease installation of the seal, lubricate the bel­
lows and stationary seat O‐rings with water or a
very small amount of oil, and apply a drop of light
lubricating oil on the finished faces. Assemble the
seal as follows (see Figure 8).