Replacing The Bearings - Graco Hydra-Cat H.P. Series Instructions Manual

Replacing the Bearings

1. Relieve the Pressure. Refer to Figure 6 and Figure 7.
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the Pressure
Relief Procedure on page 11.
2. With the bleeder type main air valve (1) turned off,
remove the twenty hex bolts (16) with a 13mm wrench
or socket and then remove the four sheet metal
covers (17) from the front and back of the
proportioner. The left rear cover may contain a sensor
attached to a cable. Do not remove the sensor, but
carefully set the cover to the side without straining or
damaging the sensor or cable. The (4) four main
bearings (21) are now exposed.
3. Remove the thumb screws (14) and the two guards
(15) from the sides of the proportioner.
4. Using an adjustable wrench (or hammer and punch),
unscrew the coupling nuts (10, 11, 12) from each of
the rod adapters (13) on the two displacement pumps
and the air motor. Do not lose or drop the coupling
collars (12). See Fig. 6.
5. The left rear bearing shaft has a magnet stuck on its
end. Remove the magnet and put it in a safe place.
Use a snap ring pliers to remove the four snap rings
(22) from the shafts and remove the retaining
washers.
6. You should now be able to slide the bearings (21) off
of the shaft ends.
7. Replace the bearings only with identical Graco
replacement parts. Pack the bearings in Industrial
Grade 1, Heavy Duty, Extreme Pressure, Lithium
Soap Grease, Graco Part Number 110293 or
equivalent.
Fig. 7
18 684025
8. Re-install the new bearings (21) onto the shafts.
Doing so may require slightly shifting the shaft
assembly which may have dropped during bearing
removal.
9. Re-install the four retaining washers and their snap
rings (22).
10. Replace the magnet onto the end of the left rear
bearing shaft.
11. Make sure the coupling nuts (10, 11, 12) and the
coupling collars (12) are in place on all three rod
adapters.
12. Screw all three (3) coupling nuts (10, 11, 12) onto
the rod adapters (13) loosely. Hold each rod
adapters flats with a wrench to keep it from turning.
Use an adjustable wrench to tighten the coupling
nuts. Torque to 196–210 N.m ft-lb).
13. Replace the covers (17) and the bolts (16).
14. Replace the two guards (15) and the thumb screws
(14) onto the sides of the proportioner.
15. Turn on the air supply. Follow the procedure for
starting the pump on page (11). Run the pump
slowly at first to ensure proper operation.
Bearing Inset