Air Motor and Throat Service

16.Pull the trip rod (40) so it is sticking up out of the air motor cylinder (35).

You may have to hold the unit upside down to shake the trip rod loose.

17.Grip the trip rod (40) with padded pliers, screw the cylinder cap nut (39) onto the trip rod, push the cyl- inder cap nut down, and screw it into the top of the cylinder.

CAUTION

Do not damage the plated surface of the trip rod (40). Damaging the surface of the trip rod can result in erratic air motor operation. Use the special padded pliers to grasp the rod.

18.Place the piston ball (100) in the displacement rod (29).

19.Clean the threads of the fluid piston (107), apply Loctite® to the threads, install the new packing o–ring (102*) on the fluid piston, and thread the fluid piston onto the displacement rod (29).

20.Clamp the flats of the fluid piston (107) in a vice, and torque the displacement rod (29) to the piston to 40 to 60 ft–lb (54 to 81 N•m).

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

22.Use a strap wrench to screw the displacement pump cylinder (105) to the air motor base (28), and torque to 40 to 60 ft–lb (54 to 81 N•m).

23.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.

Never operate the pump with the warning plate (47) or the identification plate (46) removed. These plates protect your fingers from getting pinched or ampu- tated by moving parts in the air motor.

24.Reconnect the ground wire before you resume regu- lar pump operation.

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