AIRLESSCO LP500 - Manual (Page 12)

Maintenance
12 3A1185H
Servicing the Fluid Pump
Fluid Pump Disconnect
1. Relieve Pressure, page 8.
2. Flush the material you are spraying out of the
machine.
3. Remove the connecting rod shield (12).
4. Move the piston rod (10) to its lowest position by
cycling pump slowly.
5. Turn off the motor and disconnect power from unit.
6. Disconnect fluid tube (17) from pump body.
7. Remove the retaining ring (4) from the connecting
rod (2) and slide the sleeve (3) down revealing the
connecting rod pin (1).
8. Remove the suction tube assembly from the fluid
pump (9) by unscrewing the suction nut (7) with the
packing adjustment tool. (865008).
9. Using a 1/2” wrench, unscrew the two bolts (8) from
the cover assembly (14). The fluid pump (9) will be
hanging loosely at this point.
10. Remove the connecting rod pin (1) out of the con-
necting rod (2), allowing the removal of the fluid
pump (9) from the machine.
Fluid Pump Reinstall
1. Loosen the packing nut and ensure that the piston
rod (10) is in its upper position in the fluid pump
body, snap cap onto packing nut and slip the sleeve
(3) and the retaining ring (4) over the piston rod
(10).
2. Push the piston rod (10) up into the connecting rod
(2) and align the holes. Insert the connecting rod pin
(1) through the connecting rod (2) and piston. Slip
the sleeve (3) up over the connecting rod pin (1) and
insert the retaining ring (4) into the groove on the
connecting rod (2).
3. Push the two bolts (8) through the tube spacers (11)
and screw them into the cover assembly. Using a
1/2” wrench, tighten the two bolts (8) evenly (alter-
nating between them) until you reach 20 ft-lbs
(27.12 N.m).
4. Reassemble lower suction valve assembly by plac-
ing the suction seat, O-ring, suction ball and suction
ball guide in the suction nut (7) and screw onto fluid
pump body.
5. Reconnect the Fluid Tube (17) to the fluid pump
body.
6. Start the machine and operate slowly to check the
piston rod (10) for binding. Adjust the two bolts (8),
holding the fluid pump body to the cover assembly,
if necessary. This will eliminate any binding.
7. Tighten packing nut clockwise until resistance is felt
against the Belleville Springs, go 3/4 of a turn more.
Put five drops of Airlessco Throat Seal Oil in the
packing nut.
8. Run the machine at full pressure for several min-
utes. Release the pressure by following the Pres-
sure Relief Procedure, page 8, and readjust the
packing nut per step 7 above.
9. Install the connection rod shield (12) so the small
hole is in the upper right hand corner.
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