5
3. Place the pump inlet and nozzle through the holes in the
top of the flush tank. (Figure 3)
Figure 3
CAUTION
WARNING
4. Open the nozzle and turn the pump on. Circulate distilled
water through the pump for 10 to 15 minutes. Open and
close the nozzle several times to flush the bypass poppet.
5. Lift the pump from the water. Allow the pump to run briefly
until only air passes through the system. Turn the pump
off.
Do not run the pump any longer than necessary without
flow. “Dry running” can cause overheating and pump
damage.
6. Drain the hose and nozzle. Wipe entire system with a clean
damp cloth.
To avoid fluid exposure, follow fluid manufacturer’s
instructions for the disposal of contaminated water.
Clean Pump
If fluid dries inside pump, remove the residue before further use.
1. Disconnect from power, remove the pump from the tank,
and flush.
2. Disassemble the pump as outlined in the Repair Section.
3. Thoroughly clean dried fluid from the interior of the pump.
Take care not to scratch parts.
4. Wash the bypass poppet in distilled water.
5. Assemble the pump.
REPAIR – PA-120DEF
WARNING
WARNING
When handling DEF, always wear protective clothing
such as goggles, gloves, and respirators, as instructed
by the fluid manufacturer.
For your protection, flush system before disassembling.
During repair, carefully inspect all parts for wear or damage and
replace, as necessary. Check O-rings and seals for breakage,
wear, and signs of deterioration, such as swelling.
Clean or Replace Strainer
1. Disconnect pump from power and flush.
2. Remove the coverplate and O-ring from the housing.
3. Remove the strainer.
4. Clean or replace the strainer. Install again.
5. Install the coverplate and O-ring. Torque screws to 25 to
35 in-lbs.
Clean or Replace Inlet Fitting
1. Disconnect pump from power and flush.
2. Remove the inlet fitting from the pump housing.
NOTE: Ensure proper seating of the O-ring between the inlet
fitting and the housing.
3. Clean or replace the inlet fitting. Install again. Torque screws
to 45 to 50 in-lbs.
Clean or Replace Bypass Poppet
1. Disconnect pump from power and flush.
2. Remove the bypass poppet plug.
3. Remove the bypass poppet. Gently rock it back and forth
as necessary to remove.
4. Wipe the cavity clean and wash the bypass poppet in
distilled water.
5. Examine all components and replace as necessary.
6. To replace the poppet O-ring, carefully remove the O-ring
using a small screwdriver or similar tool. Seat new O-ring
on the poppet head.
7. Assemble by placing the bypass poppet assembly in the
cavity. Tighten the plug firmly.
