Maintenance PT 6 /...
wc_tx000567gb.fm 38
5.14 Impeller Clearance
See Graphic: wc_gr003206
Sand, dirt, and debris will cause the impeller to wear. If the pump’s
performance drops over time, check and adjust the clearance between
the impeller and the insert.
5.14.1 Shut down the machine.
DO NOT reach into or insert anything into the pump while the engine
is running!
DO NOT run the pump with the impeller cover removed.
5.14.2 Open the bottom drain cover and drain the pump.
5.14.3 Remove the suction flange (a) and the flapper gasket (b) from the front
of the pump.
Impeller edges can become extremely sharp; use care when working
on the pump to reduce the risk of being cut.
5.14.4 Clean the impeller (d) with a 50-50 mixture of bleach and water before
working on it.
5.14.5 Reach inside the pump through the suction port, and use a feeler
gauge (c) to check the gap between the impeller and the insert (e). The
pump will operate most efficiently when the gap is maintained between
0.15–0.75 mm (0.005–.025 in.). Larger gaps are allowable but may
reduce pump output slightly.
5.14.6 If necessary, add shims (f) between the insert and the impeller cover
(g) to decrease the gap between the impeller and the insert. The insert
is attached to the back side of the impeller cover. To add shims:
• Remove the impeller cover.
• Remove the screws that secure the insert to the impeller cover.
• Add shims as required and recheck the clearance gap.
• After the proper shimming has been determined, use a high-
strength threadlocking compound on the screws and secure the
shims and insert to the impeller cover. Torque the screws to 26
Nm (19 ft.lbs.).
5.14.7 Reinstall the suction flange and the flapper gasket.
WARNING
CAUTION
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