Wacker Neuson PG 3A, Operator'S Manual

Page: 29 / 54

PG 2A / 3A Maintenance
wc_tx000178gb.fm
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5.5 Replacing the Mechanical Seal
See Graphic: wc_gr000839
To service the mechanical seal do the following:
5.5.1 Remove the impeller (a) from the engine shaft by turning it
countercockwise.
Note: If the impeller is hard to remove, tap it with a plastic mallet. Do
not lose any adjusting shims (b) .
5.5.2 Remove mechanical seal spring (c) and carbon face (d) from
crankshaft.
5.5.3 Remove mechanical seal ceramic face (e) and L-ring (f) .
5.5.4 Clean engine shaft, remove any rust. Also clean contact surface of
ceramic and carbon faces with a clean cloth. Do not lubricate seal
faces.
5.5.5 Place ceramic face in L-ring and install in pump flange. Carefully place
carbon face and seal spring on engine shaft.
5.5.6 Mount impeller to engine shaft. Turn impeller shaft clockwise to
tighten. See Section
Adjusting Impeller Clearance .