Graco 03761B Displacement Pump Service, Stainless Steel Displacement PUMPS, with rubber packings

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Displacement Pump Service

STAINLESS STEEL DISPLACEMENT PUMPS, with rubber packings

This procedure covers the following displacement pumps. Refer to the parts drawings on the indicated pages for an illustration of your pump.

DModel 220440, page 33.

DModel 220439, page 34.

Before You Start

1.Disconnect the displacement pump from the air motor as explained on page 11.

2.Be sure you have all the necessary repair parts on hand to reduce downtime.

3.Repair Kit 218112 is available. For best results, use all the new parts in the kit even if the old parts look good.

Intake Valve

1.Unscrew the intake valve housing (23) from the cylinder (13), using a strap wrench. Disassemble the valve and clean and inspect all parts.

2.Inspect the ball (28) and seat in the housing (23) for wear or nicks.

3.Replace parts as necessary. Reassemble as shown in the applicable parts drawing.

Piston Valve

1.Using a strap wrench, grip the cylinder (13) near the outlet housing (6) and unscrew it from the housing. Pull the cylinder down off the piston. Check the inner surface of the cylinder for scoring or wear by running a finger over the surface or holding the part up to the light at an angle.

2.On Model 220440, loosen the lower nut (16) and unscrew the valve housing (18) from the connect- ing rod (17). Unscrew the piston stud (22).

On Model 220439, remove the cotter pins (29) from the ball stop pin (30). Remove the ball stop pin and unscrew the piston stud (22) from the dis- placement rod (15). Be careful not to drop the ball (25).

3.Clean and inspect all piston parts. Be sure to in- spect the ball (25) and its seat on the piston stud (22) for wear or nicks. Replace parts as necessary. Reassemble the piston parts as shown, being sure that the lips of the u-cup packing (21) are facing up. Torque as specified on the applicable illustra- tion. Using a strap wrench, grip the cylinder (13) near the outlet housing (6) and screw it into the housing.

NOTE: On Model 220440, when reassembling the pis- ton to the connecting rod (17), screw the connecting rod all the way into the displacement rod (15). Tighten the upper nut (16) against the displacement rod and torque to 33 NSm (24 ft–lb). Adjust the lower nut (16) to allow 3.1 mm (0.125 in.) free travel for the ball (25).

Also, when installing the cylinder (13), make sure that the knurled end is at the bottom.

Throat Packings

1.Remove the cylinder (13) and piston as explained previously. Remove the packing nut (1) and pull the displacement rod (15) out of the top of the out- let housing (6). Inspect the outer surface of the displacement rod for scoring or wear by running a finger over the surface or holding it up to the light at an angle.

2.Remove the throat packings from the outlet hous- ing (6).

3.Clean and inspect the parts for wear or damage. Lubricate the packings before reassembly. Install the parts one at a time, in the same position as before. The lips of the u-cup must face down against fluid pressure.

4.Leave the packing nut (1) loose until the displace- ment rod (15) has been installed.

CAUTION

Insert the displacement rod from the top of the outlet housing to prevent shearing of the packings.

5.Tighten the packing nut just enough to prevent leaking. Overtightening can damage the packings.

6.Reconnect the displacement pump to the air motor as explained on page 11.

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Contents Instructions-Parts List Table of ContentsSymbols 307427Fire and Explosion Hazard Pump Models Stubby PumpsBung-Mounted Drum Length Pumps This model isGrounding the System InstallationGeneral Information Mounting the Pump Model 226951 onlySystem Accessories Model 226951 OnlyAll Other Models Model 226951 ShownPressure Relief Procedure Flush the Pump Before UsingStarting and Adjusting the Pump OperationMaintenance Troubleshooting Problem Cause SolutionPump Service Disconnecting the Air MotorReconnecting the Air Motor Pressure Relief Procedure onPump Parts Bung Mount Drum-Length Pumps, Carbon Steel ModelsDescription Qty Model 226940 ShownBung Mount Drum-Length Pumps, Stainless Steel Models Model 226953 ShownModel 226943 Shown Stubby Length Pumps Carbon Steel ModelsModel 226943, Series B, leather packed Stubby Length Pumps Stainless Steel Models Model 226945 ShownBung Mount Adjustable Length Pump, Carbon Steel Model Model 226951, Series B, rubber packed Description QtyDisplacement Pump Service Before You StartIntake Valve Piston ValveDisplacement Pump Parts Model 215953 Displacement Pump, Series DModel 215956 Displacement Pump, Series C Liter 55 Gallon Size, Carbon Steel, Leather PackedModel 215954 Displacement Pump, Series D Model 215957 Displacement Pump, Series CLiter 55 Gallon Size, Carbon Steel, Polyethylene Packed Stubby Size, Carbon Steel, Polyethylene PackedModel 237254 Displacement Pump, Series a CylinderModel 237449 Displacement Pump, Series a Liter 55 Gallon Size, Carbon Steel, Ptfe PackedModel 237255 Displacement Pump, Series a Stubby Size, Carbon Steel, Ptfe PackedCarbon Steel Displacement PUMPS, with rubber packings Model 218113 Displacement Pump, Series a Model 218114 Displacement Pump, Series aLiter 55 Gallon Size, Carbon Steel, Rubber Packed Stubby Size, Carbon Steel, Rubber PackedModel 218116 Displacement Pump, Series a Adjustable Length, Carbon Steel, Rubber PackedDisplacement Pump Service Model 215955 Displacement Pump, Series B Liter 55 Gallon Size, Stainless Steel, Polyethylene PackedModel 215958 Displacement Pump, Series B Stubby Size, Stainless Steel, Polyethylene Packed307427 Model 237253 Displacement Pump, Series a Liter 55 Gallon Size, Stainless Steel, Ptfe PackedModel 237256 Displacement Pump, Series a Stubby Size, Stainless Steel, Ptfe PackedStainless Steel Displacement PUMPS, with rubber packings Model 220440 Displacement Pump, Series a Liter 55 Gallon Size, Stainless Steel, Rubber PackedModel 220439 Displacement Pump, Series a Stubby Size, Stainless Steel, Rubber PackedAccessories Wall Mounting Bracket Carbon Steel. See manualOpen Tank Mounting Clamp Bung AdaptersGround Wire and Clamp Bleed-Type Master Air Valve RequiredAir LIne Filter Air LIne LubricatorDimensions Pump No Overall Length Pump Length Fluid Inlet Fluid OutletTechnical Data Category Data307427 Graco Standard Warranty Graco Information

03761B specifications

The Graco 03761B is a high-performance airless paint sprayer designed to simplify the painting process for both homeowners and professionals. Renowned for its efficiency and ease of use, this sprayer is a go-to tool for delivering a smooth and even finish on a variety of surfaces.

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