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.

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

Fig. 7

18 684025

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