Graco 238108, Series D Air Motor and Throat Service, 41 to 54 N.m using a 2-in.socket, 308608K

Air Motor and Throat Service

12.Grease and reinstall the u-cup seal (10{), thread the throat bearing (36) into the air motor base (28), and torque the throat bearing to 30 to 40 ft-lb

(41 to 54 N.m) using a 2-in. socket.

13.Slide the piston rod (29) down through the pack- ing, and lower the piston assembly (27) into the air motor base (28).

14.Carefully lower the cylinder (30) straight down onto the piston assembly (27). Tighten the eight screws

(3) holding the cylinder to the base (28).

CAUTION

To avoid damaging the cylinder wall, lower the cylinder straight down onto the piston. Never tilt the cylinder as it is being lowered.

15.Grip the trip rod (31) with padded pliers, screw the lift ring (24) onto the trip rod, push the lift ring down, and screw it into the top of the cylinder.

16.Install the u-cup packing (107{) with the lips up, and place the piston washer (113) on the piston/ valve seat (109). Make sure the lips of the u-cup packing face up. See Fig. 3.

17.Place the piston ball (103) in the piston rod (29).

18.Clean the threads of the piston/valve seat, Apply Loctiter to the threads, (109), and thread the assembly from Step 16 onto the piston rod (29).

19.Clamp the flats of the piston/valve seat (109) in a vice, and torque the piston rod (29) to the piston valve seat to 40 to 60 ft-lb (54 to 81 N.m).

20.Clamp the air motor base (28) in a vise horizontally by closing the vice jaws on the flange

21.Use a strap wrench to screw the displacement pump cylinder (110) to the air motor base (28), and torque to 95 to 105 ft-lb (129 to 142 N.m).

22.Before remounting the pump, connect an air hose and run the air motor slowly, starting with just enough air pressure to make the air motor run, and make sure that it operates smoothly.

23.Reconnect the ground wire before regular opera- tion of the pump.

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