6 Maintenance
24
Read the instructions carefully. The items refer to the parts list and service kits section.
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 GJ 18 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 grease is acceptable, for Viton®
O-rings, however, Silicon based lubricant must be used for EP O-rings.
Refer to the illustrations in Section 8 for clarification during reassembly.
Drawings 14-17
Gear Train
Replace the Planetary Output Shaft Washer (pos. 16.9) in the bottom of the Planetary Ring Gear (pos. 16.1), denoted by the
chamfered outer edge of the Ring Gear. Insert one of the Gear Box Snap Rings (pos. 16.2) to retain the Washer.
Ensure that the Planet Gear Idler Shafts (pos. 16.6.3, pos. 16.8.2) are pressed firmly into the Planetary Output Shaft (pos.
16.8.1) and three Planet Carrier Plates (pos. 16.6.1). Confirm that the Planet Gear Pinions (pos. 16.6.2) are also pressed firmly
into the Carrier Plates.
The Planet Gear Bushings (pos. 16.4.2) should be pressed into the Planet Gears (pos. 16.4.1). If reusing worn Bushings, sliding
clearance inside the Gears is permissible, but the fit should not be sloppy.
Place one Planet Gear Washer (pos. 16.5) around each Idler Shaft (pos. 16.6.3, pos. 16.8.2) on every platform, then place one
Planet Gear with its Gear Bushing onto each Idler Shaft.
Note: The sixteen Planet Gears (pos. 16.4.1) in the Gear Train are identical. They are interchangeable
and can be safely installed on any of the Idler Posts in any Layer.
Hold the assembled Lower Gear Stack Layer (Drawing 17) with the output shaft facing down and the Gears facing upward.
Place one Inter-Tier Planetary Washer (pos. 16.7) on top of the Gears, then put one of the Upper Gear Stack Layers on top of
the Inter-Tier Washer.
Caution: During reassembly, the Gear Stack should be lightly repacked using food-grade grease. Please
contact Alfa Laval for a specific grease recommendation.
Complete the Gear Stack (Drawing 15) with alternating Inter-Tier Washers (pos. 16.7) and Upper Gear Stacks (Drawing 16).
Complete the Gear Stack with the Top Planetary Large Washer (pos. 16.3).
Firmly hold the Gear Stack (Drawing 15) and apply pressure with fingers to the Top Washer and the underside of the Planetary
Output Shaft (pos. 16.8.1) to keep the parts assembled. Maintaining this hold on the Gear Stack, flip the Stack upside down so
that the Output Shaft is facing up.
Take the Planetary Ring Gear (pos. 16.1), with the already-installed Output Shaft Washer (pos. 16.9) and Snap Ring (pos. 16.2)
facing up and lower the Ring Gear onto the inverted Gear Stack. Rotate the Ring Gear back and forth slightly to get the Planet
Gears (pos. 16.4.1) to mesh with the teeth of the Ring Gear. The Gear Stack is in place once the Top Washer is flush up against
the teeth of the Ring Gear. Insert the remaining Gear Box Snap Ring (pos. 16.2) to secure the Top Washer.