Servicing The Fluid Pump - AIRLESSCO LP460 Service & Operation Manual

SERVICING THE FLUID PUMP

NOTE: Check everything in the Troublshooting Chart before disassembling the Fluid Pump.
Fluid Pump Removal -
1. Follow the Pressure Relief Procedure 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 or by rotating the motor fan.
5. Disconnect the sensor (331-294-99) by holding it in
place with a 7/8" wrench and unscrewing the swivel
connector (100-003) with an 11/16" wrench.
DO NOT TURN THE SENSOR.
6. 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).
7. Remove the suction tube assembly from the fl uid pump
by unscrewing the suction nut (331-034) with
the packing adjustment tool.
8. Using a 1/2" wrench unscrew the two bolts (100-318)
from the cover assembly 331-234). The fl uid pump
(331-209) will be hanging loosely at this point.
9. Remove the connecting rod pin (331-065) out of the
connecting rod (331-038), allowing the removal of the
fl uid pump (331-209) from the machine.
Fluid Pump Fluid Pump
331-209 331-209
Low Boy/Carry
331-236
Hi Boy
16
Refer to Figure 11
FIGURE 11
Fluid Pump Reinstallation -
Refer to Figure 11 & 14
1. Loosen the packing nut and ensure that the piston rod
(331-093) is in its upper position in the fl uid pump
body. 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 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 the lower suction valve assembly by
placing the suction seat assembly: O-ring (106-011),
suction ball (331-030) and suction ball guide (331-029)
in the suction nut (331-034) and screw onto the fl uid
pump body.
5. Reconnect the sensor (331-294-99) to the fl uid pump
body. Hold the sensor with a 7/8" wrench while
tightening the swivel connector (100-003) with an
11/16" wrench.
DO NOT TURN THE SENSOR.
6. Start the machine and operate slowly to check the
piston rod for binding. Adjust the two bolts, holding the
fl uid pump body to the cover assembly, if necessary.
This will eliminate any binding.
7. Tighten the packing nut counter clockwise until
resistance is felt against the Belleville Springs, then go
3/4 of a turn more. Put fi ve drops of Airlessco Throat
Seal Oil into the packing nut.
8. Run the machine at full pressure for several minutes.
Release the pressure by following the Pressure Relief
Procedure & readjust the packing nut per step 7 above.
9. Install the connecting rod shield (331-111) so that the
small hole is in the upper right hand corner.