Note: Check everything in the Troubleshooting Chart before disassembling the sprayer.
FLUID PUMP DISCONNECT
1. Flush out the material you are spraying, if possible.
2. Follow the Pressure Relief Procedure on page 10. Stop the pump in the middle of down stroke.
3. Remove the suction tube and uid hose (if so equipped) from the uid pump.
4. Remove the connecting rod shield from the pump.
5. Remove 2 retaining rings and slip the sleeve of the coupling down and remove both coupling halves. This
will disconnect uid pump from the connecting rod.
6. Using a 7/8” box wrench, disconnect the high pressure uid line from the pump.
7. Using a 9/16” wrench, unscrew the two tie rod locknuts.
8. Pull the pump off the tie rods.
FLUID PUMP REINSTALL
1. Loosen the packing nut & extend piston rod to fully up position. Slip sleeve (187-047) over the piston rod.
2. Make sure that the spacer tubes (301-048) are in place.
3. Connect the connecting rod with uid the uid pump by installing the coupling halves (189-046). Slide
sleeve over the coupling halves and secure with retaining ring (189-048).
4. Secure the uid pump housing to the tie rods (100-328) and screw locknuts with washers on loosely.
5. Tighten the tie rod locknuts evenly to 30 ft. lb.
Note: After all the rod locknuts are tight, the alignment of both rods should allow easy assembly and
disassembly of the coupling. If any binding, loosen and retighten all the rod locknuts to improve the
alignment. Misalignment causes premature wear of seal and packings.
6. Tighten packing nut clockwise until resistance against the packings can be felt. Turn it one full turn more.
7. Start the pump and operate it slowly (at low engine speed) to check the piston rod for binding. Adjust tie
rod lock nuts if necessary to eliminate binding.
8. Prime the unit and run at maximum pressure for several minutes, then release the pressure & repeat step 6.
9. Fill the wet cup (packing nut) with ve drops of TSO (Throat Seal Oil).
SERVICING FLUID PUMP
16
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