Pump Solutions Group Neptune Series 600 dia-PUMP MODELS 610 thru 647 - Manual (Page 14)

SECTION III
PUMP MODELS 635, 637 AND 647
NORMAL MAINTENANCE
TO VIEW FIGURE NUMBERS:
For Models 635 & 637 refer to Drawing on page 22.
For Model 647 refer to Drawing on page 24.
7.2 MAINTENANCE
Under normal conditions, the “dia-Pump” should not require any significant amount of maintenance. It is advised
that periodic visual observations be made of the oil level to make sure that it is within ¼” of the dipstick mark.
The liquid end of the pump should also be inspected for leakage. These observations should be made regularly.
The hydraulic fluid should be drained and replace twice a year, using the drain plug (FIG. #0130) at the back of
the pump. This change can be scheduled with the normal factory maintenance at seasonal periods.
7.2.1 Check Valves: Removing, cleaning, replacing.
The “dia-Pump” incorporates a unique check valve design whereas the discharge and suction piping
NEED NOT be disturbed in order to service the valves.
Should the valves need cleaning, remove as follows:
7.2.11 Remove vent plug (FIG. #3214) with anti-siphon spring (FIG. #3218) if installed.
7.2.12 Remove eight valve cap screws (FIG. #3236) on suction and discharge caps.
7.2.13 Remove discharge cap (FIG. #3212) along with retaining screen (FIG. #3216). Remove
suction cap (FIG. #3228).
7.2.14 With heavy wood dowel or bar of soft material, tap and push complete valve stack out of pump
from top through to bottom. The valve stack consists of:
4 Valve Balls (FIG. #3240)
4 Valve Seats (FIG. #3222)
2 Ball Retainers (FIG. #3224)
3 Stack Spacers (FIG. #3226)
1 Valve Ball Spacer Retainer (FIG. #3220)
4 Valve Seat “O” Rings (FIG. #3242)
NOTE: Valve seats are seated both sides and may be reversed.
7.2.15 Clean valve stack parts with suitable solvent. Replace in same order as removed from top to
bottom, putting suction valve cap (FIG. #3228) in place with “O” ring first.
7.3.1 Procedure for replacing CONTROL ROD “O” RING (FIG. #1434 for Models 610 & 615, FIG. #2334 for Models
620 & 625, FIG. #3234 for Models 635, 637 & 647) and SEALING PLATE “O” RING (FIG. #2333 for Models 620
& 625, FIG. #3233 for Models 635, 637 & 647).
7.3.11 Remove hydraulic fluid from gear box.
7.3.12 Remove indicator plate (FIG. #0118) by removing two indicator plate screws (FIG. #0143).
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