5 Maintenance
20
Read the instructions carefully. The items refer to the parts list and service kits section.
Drawings 2, 6
Input Shaft Lower Bearing Housing and Output Shaft
Inspect the Carbide (49) in the Input Shaft Lower Bearing Housing (21; drawing 2). It should be pressed fully into the (21) and
should not be chipped or cracked.
Check for signs of scoring and wear on Output Shaft (13). Replace if the coating has been chipped or cracked.
Drawings 13-15, 17
Nozzle Housing
Unscrew the Nozzles (47) with pliers and inspect for debris caught on the Stream Straightener (36) or in the nozzle orifice. The
inside diameter of the (47) must be smooth, round, and free of damage (especially any nicks) for maximum jet impact.
Replace worn or oversized nozzles if the original flow rate and pressure are required.
Verify the (36) is tight in the bore of the (47).
Inspect the Nozzle Housing Bevel Gear (16) for wear such as sharp/pointed or worn teeth. If it needs to be replaced, remove
the Bevel Gear Retaining Ring (17) with a small slotted screwdriver and pry the (16) from the Nozzle Housing (9).
Clean any deposits from the Nozzle Housing Cups (27) and examine for excessive wear. Light scoring is acceptable, but the
(27)s should be replaced if they are grooved in the bearing contact area. A good maintenance program will require replacing
many (27)s, therefore, it may be worthwhile to make or obtain press tools for pressing a (27) out of a (9). The press tools are
available from Alfa Laval Tank Equipment. Before installing a new (27), clean the housing bores and remove any burrs
resulting from (27) removal. Press them in so that their flanges are flush against the (9).
Inspect the Nozzle Housing Bearings (25) and (26). Clean any deposits from the exterior of the (25)/(26) and check their fit in
the (27). While they should turn freely, the (25) and/or (26) should be replaced if the thickness of the
flange
is
2.18mm
(
0.086”
), or less, to avoid shortening the life of the Bevel Gears (15) and (16).
Drawings 8, 10, 11
Tee Housing and Tee Housing Cap
Check the water outlets on the nose of the Tee Housing (8); they should be free of debris.
Inspect the Tee Housing Bearings (23). Clean any deposits from the exterior of the (23) and check their fit in the Tee Housing
Cups (24). While they should turn freely, a (23) should be replaced if the thickness of the
flange
is
2.41mm (
0.095”)
, or less,
to avoid shortening the life of the Bevel Gears (15) and (16).
Inspect the Tee Housing Cap O-ring (3) for compression set or deterioration. Replace, if needed.
Inspect the Tee Housing Bevel Gear (15) for worn, damaged or sharp/pointed teeth.
Ensure that the Bearing Locking Pin (37) is pressed firmly into (15).
Clean any deposits from the (24) and examine for excessive wear. Light scoring is acceptable, but the Cups should be
replaced if they are grooved in the bearing contact area. A good maintenance program will require replacing many (24)s,
therefore, it may be worthwhile to make or obtain press tools for pressing a (24) out of the (8). The press tools are available
from Alfa Laval Tank Equipment. Before installing a new (24), clean the housing bores and remove any burrs resulting from a
(24) removal. Press them in so that their flanges are flush against the (8).
Ensure that the (37) is pressed firmly into the (8).
Drawings 7, 9
Stem and Stem Base
The Bearing Locating Pin (37) should be firmly pressed into the Stem Base (22).
Inspect the water outlets of the Stem (7); they should be free of debris.
The Dowel Pins (1) and Tapered Pins (35) should be firmly pressed into the (7).
Check the Clutch O-ring (33) for signs of damage (clipped or cut), deterioration (compression set or hardening) or wear (flat
edge developing or ring has thinned) and replace if necessary.
Drawings 7
Clutch to Pin Drive, Pin Drive to Clutch
The Dowel Pin (1) should not be present in the Stem (7) if the machine is a clutch machine. In order to make the machine a
pin driven machine, simply push a (1) into its hole in the (7) until it completely stops at the bottom of the hole. The Clutch O-
ring (33) remains in place.
Warning: Once a machine is made into a pin drive, the Nozzle Housing (9) will no longer rotate freely. Forcing the
Nozzle Housing (9) to rotate will result in damage to the machine.
To make a pin machine into a clutch machine, use a pair of pliers to grip the (1) and pull it out of the (7). If the (1) cannot be
pulled out, use a grinder to grind away the exposed portion of the (1); this method will make it harder to return the machine to
a pin drive if desired later. The (33) should already be installed and will run as a normal clutch machine.
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