Inner Pump Shaft O-Ring Replacement - Fluke 700HPPK Service Manual

700HPPK
Service Information

Inner Pump Shaft O-Ring Replacement

1. Unscrew the air exchange (Figure 9, ) valve with a
24 mm wrench (without unscrewing the ball/O-ring
retainer nut) while ensuring the ball bearings do not
fall off from their pockets.
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Figure 9. Air Exchange Valve
2. Once completely unscrewed, remove the pump shaft
assembly and the brass end cap from the bottom of
the pump to expose the non-return valve at the base
(Figure 10, ).
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3. Remove the brass end cap from the pump shaft.
Figure 10. Pump Shaft O-ring Replacement
4. There are two O-rings in the brass end cap, see
Figure 10:
•
An upper thin O-ring which seals against the
bottom of the pump body (no need to replace).
•
A thicker O-ring () which sits inside a machined
slot at the bottom of the end cap and seals
against the pump shaft.
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Carefully remove the thicker O-ring.
5. Apply silicone grease before installing the new O-ring.
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