Servicing the Fluid Pump

Fluid Pump Disconnect

Fluid Pump Reinstall

Refer to Figure 1

1.Follow the Pressure Relief Procedure on page 10.

2.Flush the material you are spraying out of the machine.

3.Remove the connecting rod shield (331-111).

4.Move the piston rod (331-093) to its lowest position by cycling pump slowly.

5.Remove the retaining ring (331-062) from the connecting rod (331-038) and slide the sleeve (331- 117) down revealing the connecting rod pin (331-065).

6.Remove the suction tube assembly from the fluid pump (331-209) by unscrewing the suction nut (331-034) with the packing adjustment tool.

7.Using a 1/2” wrench unscrew the two bolts (100-318) from the cover assembly (331-234). The fluid pump (331-209) will be hanging loosely at this point.

8.Remove the connecting rod pin (331-065) out of the connecting rod (331-038), allowing the removal of the fluid pump (331-209) from the machine.

FIGURE 1

331-209

Refer to Figure 1 & 4

1.Loosen the packing nut and ensure that the piston rod (331-093) is in its upper position in the fluid pump body (331-011). Slip the sleeve (331-117) & the retaining ring (331-062) over the piston rod.

2.Push the piston rod up into the connecting rod (331-

038)& align the holes. Insert the connecting rod pin

(331-065) through the connecting rod & piston. Slip the sleeve up over the connecting rod pin and insert the retaining ring into the groove on the connecting rod.

3.Push the two bolts (100-318) through the tube spacers (331-074) & screw them into the cover assembly (331-

234).Using a 1/2” wrench, tighten the two bolts evenly (alternating between them) until you reach 20 ft-lbs.

4.Reassemble lower suction valve assembly by placing the suction seat (331-409), O-ring (106-011), suction ball (331-030) & suction ball guide (331-029) in the suction nut (331-034) & screw onto fluid pump body.

5. Start the machine and operate slowly to check the piston rod for binding. Adjust the two bolts, holding the fluid pump body to the cover assembly, if necessary. This will eliminate any binding.

6.Tighten the packing nut clockwise until resistance is felt against the Belleville Springs, then go 3/4 of a turn more. Put five drops of Airlessco Throat Seal Oil into the packing nut.

7.Run the machine at full pressure for several minutes. Release the pressure by following the Pressure Relief Procedure & readjust the packing nut per step 6 above.

8.Install the connecting rod shield (331-111) so that the small hole is in the upper right hand corner.