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Section 5 • Maintenance/Service
Important Notes
1. Backlash cannot be checked if:
• The gaterotor is damaged in any way.
• The clearance between the gaterotor and the shelf is
too tight.
2. Make sure you check the backlash, not the float:
• The backlash is the clearance between the gaterotor
teeth width and the rotor groove.
• The float is the amount of play between the gaterotor
bushing and the damper pins.
Additional Inspections
In addition, visually inspect the main rotor and gatero-
tors for signs of abnormal wear due to dirt or other
contaminants.
If some chipping is present on the edges of the gatero-
tor, this will not influence the compressor performance.
If chipping is more than what´s shown on Figure 5-18,
take pictures and contact Vilter Service Department.
Post Inspection
After all the inspections are complete, the gaterotor cov-
er, suction tee, coupling center member and coupling
guard can be reinstalled and the unit can be evacuated
and leak checked before starting.
5 – 14
HPLD Single Screw Compressor • Installation, Operation and Service Manual • Emerson • 35391HP
Figure 5-18. Chipped Edge of Gaterotor
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