8
1.0.8 Fill gearbox and pump by pouring the hydraulic fluid (drive lubricant) supplied through the fill
opening at the rear of the pump. Pour fluid in slowly until it covers the worm gear. The control
knob should be in the zero position during the filling.
PLEASE NOTE: TO VENT THE AIR, REMOVE VENT PLUG LOCATED ON TOP OF THE OIL HEAD
(# 54 on Parts Drawing).
Allow 30 minutes for hydraulic fluid to make its way into pump chamber and then recheck fluid
level.
The hydraulic fluid supplied by Neptune is EP SAE 90.
Common sources for hydraulic fluid are:
Shell Oil Omala #220
Mobil Oil Mobil Gear #629
Sun Oil Sun Oil #220
Texaco Meropa #220
2.0 SUCTION PIPING
2.0.1 The suction piping to the pump must be absolutely airtight and one size larger than suction
inlet size of the pump. It is suggested that the suction piping be tested with low air pressure
and a soap solution to assure that no leaks exist. Limit the total length of the suction line to 3-4
feet for suction lift or 6-7 feet for flooded suction. Minimize bends, elbows, or other restrictions.
2.0.2 NEPTUNE RECOMMENDS THAT THE “dia-PUMP” BE OPERATED WITH A FLOODED
SUCTION, AS THIS WILL FACILITATE START UP AND INCREASE THE SERVICE LIFE OF
THE PUMP.
2.0.3 It is highly recommended that all solution tanks be furnished with a low level cut off switch or
low-level alarm and cut off switch to prevent the pump from running dry. OPERATION
AGAINST A DRY SYSTEM WILL CAUSE DAMAGE TO THE PUMP DIAPHRAGM AND
REDUCE THE OPERATING LIFE OF THE PUMP.
3.0 DISCHARGE PIPING
3.0.1 It is recommended that the “dia-Pump” operate against a minimum discharge pressure of 50
psig.
3.0.2 All Neptune Series 6000 “dia-Pumps” are supplied with an internally pre-set relief valve. This
relief valve is set above the actual rated discharge pressure of the pump and is designed to
protect the pump should a discharge pressure’ beyond the rated limit of the pump occur.
3.0.3 To protect the piping system, it is recommended that an external relief valve as manufactured by
Neptune Chemical Pump Company, or equal, be placed in the discharge line of the pump.
3.0.4 Discharge piping should equal discharge port size.
4.0 ADJUSTMENT OF INTERNAL RELIEF VALVE
4.0.1 All Neptune Series 6000 “dia-Pumps” are supplied with an internally pre-set relief valve. The
internal relief valve is set as follows:
APROXIMATE INTERNAL RELIEF VALVE SETTING (PSI)
Model 1/2 HP 3/4 H/P 1 H/P 1-1/2 HP 2 HP
6100 1500 2500 3000 4000
4500
6150 1500 2500 3000 3500
4000
6250 600 1200 2000 2300 2500
(35 pages)
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