GREAT PLAINS PA-120DEF Owner's Manual - Page 5

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Flush Pump

When the pump will not be used for more than 2 weeks,

it must be flushed to prevent internal drying of fluid.

It is strongly recommended, for protection from personal

injury, that a simple flush tank be created. Use a container

with a tight fitting lid with a minimum volume of 5 gallons

(19 litres). Cut two holes in the lid of this container; one

which is approximately 1 inch (2.5 cm) larger than the

largest diameter of the pump inlet fitting and a second

hole slightly larger than the nozzle tip. Fill the container

with distilled water. Secure the lid tightly on the top of

the container.

1. Disconnect from power. Remove the pump from the

tank and drain using the instructions above.

2. Connect the pump to the appropriate power supply

(PA-120DEF to grounded GFCI protected, 115-volt

power) (P-120DEF to a 12-volt DC battery)

3. Place the pump inlet and nozzle through the holes

in the top of the flush tank. (Figure 3)

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.

CAUTION

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.

WARNING

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.

When handling DEF, always wear protective

clothing such as goggles, gloves, and respirators,

as instructed by the fluid manufacturer.

Figure 3

For your protection, flush system before dis-

assembling.

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.

REPAIR – PA-120DEF

WARNING