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46
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1. Maintenance
2. Diaphragm Replacement
3. Valve Replacement
4. Tubing
Before working on the pump, disconnect the power cord, depressurize the discharge
tubing and drain or flush any residual liquid from the pump head and valves.
Disconnect AC power to the pump and disconnect the suction tubing and discharge tubing. Remove the four
head bolts with a 5 mm hex wrench. Turn the stroke length knob fully counter-clockwise. Unscrew the
diaphragm and remove its retainer (small disk behind the diaphragm). Install the new retainer and
diaphragm on the shaft. Turn the diaphragm clockwise until it bottoms on the shaft. Replace the pump head
and tighten the head bolts to a torque of 2.6 N·m.
Remove the suction and discharge tubing. Remove the suction fit-
ting, two valve cartridges, o-ring and gasket (s). Install the new o-
ring, gasket (s) and valve cartridges.
Be sure both valve seats are in the same orientation. Refer to Figure
6, below. Tighten the suction fitting. Similarly remove and replace
the discharge valve cartridges, o-ring and gasket (s).
Check ends of tubing for splits, cracks, or thin spots. Examine the full length of tubing for damage due to
chafing, abrasion, stress cracks, excessive temperature or exposure to ultraviolet light (direct sunlight or
mercury vapor lamps). If any signs of deterioration exist, replace the entire length of tubing. It is a good idea
to replace discharge tubing on a regular preventive maintenance schedule every 12 months.
Caution
FLOW
GASKET
VALVE GUDE
VALVE CEAT
BALL
Figure 6
Valve Cartridge Orientation
5. Consumable parts
Part
Qty.
Replacement
Timing
Valve set
Diaphragm
2 sets
1
Approx.
8,000 hrs.
(Refor to pages 47 and 48)
The durability of expendable parts depends on the pressure, temperature, and properties of the liquid
handled. The value in the above table is obtained from a continuous run of the pump using clean water at
ambient temperature. Take the value as a guideline for replacement.
The valve set illustrated above represents VC, V6, PC and VM types of E30 & E35. For composition of
valve set of all other types, refer to next item "Names of parts and Structures" on pages 47 and 48.
