Pump Solutions Group Neptune Series 500 MODEL 481 THRU 547 User Manual

Page 12

4. On initial gearbox fill or after replacing hydraulic fluid, run pump for one-half to one hour to warm

up oil and allow air bubbles to dissipate. Check discharge line for indication of flow.

5. Once discharge flow is observed proceed to paragraph number 6; if no flow, repeat steps 3 and

6. Increase capacity adjustment setting to 70% of maximum capacity and operate for 10-20

minutes.

7. Reduce capacity adjustment setting to 30-40% of maximum capacity and operate for several

minutes, then increase capacity adjustment back to 100% for approximately 10 minutes. Repeat
several times to insure that the air is bled from the hydraulic fluid side and the liquid side.

6.0.4

The pump is now ready for “on line” service. Calculate what the desired capacity as a percentage of
either the maximum capacity rating on the pump data plate, or the nominal capacity at the required
system pressure.

7.0 START-UP

PROCEDURE

(SUCTION LIFT) SERIES 500 AND 500-A.

(See page 24 for SERIES 500-E) MODELS 481, 501 AND 510 REQUIRE A FLOODED SUCTION.

7.0.1

If the “dia-Pump” is to be used where suction lift is required, A FOOT VALVE STRAINER MUST BE
INSTALLED on the end of the suction line. A pipe tee is installed on the top end of the suction line
with one leg to the pump suction, one leg to the suction line and one leg pointing straight up and
plugged. Remove plug and fill piping assembly with liquid. Replace plug. Start pump and follow
procedure per Paragraph 6.0.3.

Use the following procedure only if required:

7.0.2

Remove Discharge Valve Cap (FIG. #536). Then, using Allen wrench provided, remove Discharge
Valve Nut (FIG. #543). The Discharge Valve Nut (FIG. #543) is stamped with the letter “T” to indicate
the face which should be installed toward the top on reassembly. Finally, remove Discharge Valve
Cartridge (FIG. #539) using special blade provided. Fill the pumping chamber. Replace parts and
then follow instructions per Section II, Paragraph 6.0.3. Repeat entire procedure if pump loses prime
or runs dry. (See Figures VI and VII.)

NOTE

PVC Head Pumps –Remove Discharge Valve Cap (P/N 000256) by removing Valve Cap Screws
(P/N 100250). Next, remove Discharge Valve Cartridge (P/N 000259) using special round lug tool
provided. Fill pumping chamber. Replace parts and then follow instructions per Section II
Paragraph 6.0.3. (Refer to Figure VII.)

CAUTION

Do not overtighten PVC valves as the PVC material is not able to withstand excessive force and can
fail. Teflon® paste is an excellent thread lubricant and may be applied.

8.0 START-UP AFTER SUCTION HAS RUN DRY

In applications where the suction tank does not have a low level cut-off interconnected into the pump motor
circuit, the pump may occasionally run dry. THIS MUST BE AVOIDED BECAUSE DAMAGE TO THE PUMP
CAN RESULT AND THE SERVIC LIFE WILL BE SIGNIFICANTLY REDUCED WHEN THE PUMP IS
ALLOWED TO RUN WITH A DRY LIQUID END.

Before restarting a pump that has run and which has not damaged itself, follow the procedure in Paragraph 6.0
through 6.0.3 of Section II, except it is not necessary to warm up the oil.

®Teflon – A registered trademark of the DuPont Company.