6 Maintenance
22
Read the instructions carefully. The items refer to the parts list and service kits section.
6.4 Inspection and Service of Components
Drawings 9, 10
Stem and Stem Cap
Inspect the water outlets of the Stem 7-203; they should be free of debris.
The Pin 7-440 should be firmly pressed into the 7-203.
Check the inside diameter of the 7-124-NJ. It should not be greater than
8.48mm (0.334
”)
. Replace if necessary. Also, ensure
that the bottom Output Shaft 7-212-FT still has interference with the internal ring of the 7-124-NJ by passing the 7-212-FT
through the center of the part. There will still be a slight drag if the ring is still good. If the 7-124-NJ must be replaced, make
sure that the new bearing is installed with the ring end of the 7-124-NJ entering the bore of the 7-203, first.
Inspect the Stem Cap O-ring 7-751 and Stem O-ring 642-3 for deterioration (compression set or hardening) or damage and
replace if necessary. Use a sharp brass pick to aid in removal.
6.5 Reassembly
General Notes
All parts must be cleaned thoroughly before reassembling.
Any deposits remaining on the parts can cause difficult
disassembly the next time the Alfa Laval Gamajet needs to be serviced. Also, it may cause misalignment of parts and the
potential for premature failure.
Unless otherwise stated, apply a dab of a
Teflon-based anti-seize compound
to
all threads when reassembling; this will
prevent galling of threads and ease any future disassembly.
To ease installation of all O-rings, they should be lubricated prior to reassembly. Lithium-based soap grease is acceptable, for
Viton
O-rings; however, a Silicon based lubricant must be used for EPDM O-rings.
Drawings 1 - 8
Geartrain
Push the Planetary Ring Gear (12) over the Gearhead Lower Flange (24), being sure to align the keyway of the (12) with the
Planetary Gearhead Pin (23).
Position the Body Gasket (32) over the (24). Align the smallest holes in the gasket over the small through holes for the Upper
Stem Small Screws (28).
Place the Upper Stem (1) {8 holes down toward the (24), 6 holes up} over this assembly being sure to align the Dowel Pins
(63) with proper holes in the (1).
Pass the Upper Stem Small Screws (28) through the (24; drawing
2) and, using a 5/64” Hex Key,
lightly
tighten them into the
(1). Each (28) does nothing more than hold the geartrain assembly together during service and inspections.
Turn the assembly over.
Put the Planetary Output Shaft Washer (20) onto the Output Shaft (21). Insert this assembly into the Planetary Ring Gear (12)
and pass the (21) through the center of the (24) until it bottoms out on the Planetary Output Shaft Upper Bushing (22).
Tip:
To ease in installation of the internal gearhead components, the Gearhead Assembly (drawing 8) will have to be
supported such that the Output Shaft (21) rests at the bottom of the Planetary Ring Gear (12).
Take the Collar (3) and place it on an adequately flat surface, such as a table with the inlet connection facing up. Place
the Stem (38) with the Output Shaft Lower Bearing (36) facing up. The internal holes should be centered with each other.
Place the Gearhead Lower Flange Assembly (24; drawing 2) and all of the previously installed components on top of this
with the (12) facing up.
Drop the (21) through the bottom holes. Now, the (21) will be resting at the bottom of the (24; drawing 2) and the (12).
Using a small shaft, such as a Hex Key, as a guide, drop the Planet Gear Washers (16) and then the Planet Gear Assemblies
(15; drawing 5) onto each of the bottom Planet Gear Idler Shafts (17).
Place the bottom Planetary Gearhead Large Washer (13) over each (15).
Drop the Planet Gear Carrier Assembly (18; drawing 4) into the assembly such that the Planet Gear Carrier Pinion (19) teeth
engage with all three of the (15)s.
Repeat this procedure until the Washers, Gears, and Carriers have been installed in the (12). As stated previously, it is
recommended, but not necessary, that the parts be installed back into the gearhead in their original order.
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