Air Motor and Throat Service, Before You Start

Air Motor and Throat Service

Before You Start

DBe sure you have all necessary parts on hand. Repair Kit 238751 includes repair parts for the air motor and pump. Use all parts in the kit for the best results. Parts included in the kit are marked with one asterisk, for example (19*), in the text and drawings. See the Parts List on page 14.

DTwo accessory tools should be used: Padded Pliers, 207579, are used to grip the trip rod without damaging its surface, and a 0.125-in. (3.18 mm) Gauge, 171818, is used to assure the proper clearance between the poppets and seat of the piston.

Disassembly

1. Flush the pump.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7.

2.Relieve the pressure.

3.Disconnect the hoses, remove the pump from its mounting, and clamp the air motor base (28) in a vise horizontally by closing the vise jaws on the flange.

4.Use a strap wrench on the displacement pump cylinder (110) to screw it out of the air motor base (28). See Fig. 3.

5.Remove the piston/valve seat (109) from the displacement rod (29) with wrenches or with the vise and a wrench.

6.Remove the piston ball (103), seal (107*), and seal retainer washer (113).

7.Remove the air motor base from the vise, and place the displacement rod (29) flats in the vise with the air motor up.

8.Loosen the lift ring (24). Pull up the lift ring, grip the trip rod (31) with the padded pliers, and screw the lift ring off of the rod.

CAUTION

Do not damage the plated surface of the trip rod (31). Damaging the surface of the trip rod can result in erratic air motor operation. Use the special padded pliers, 207579, to grasp the rod.

9.Remove the eight screws (3) that hold the cylinder (30) to the base (28). Carefully pull the cylinder straight up off of the piston assembly (27).

CAUTION

To avoid damaging the cylinder wall, lift the cylinder straight up off of the piston. Never tilt the cylinder as it is being removed.

	28	29
		2*

	103	lips face
		down
	113

	flange	108*
		107*
	109
		lips face up
	110
		105*

	Fig. 3	TI1072

*Included in Pump Repair Kit 238751, which may be purchased separately.

308655 9

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