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Service Guide ML520/521
Chapter 3 Maintenance & Disassembly
3.5 LUBRICATION
3.5.01 General Information
If the lubrication procedures are not performed properly, the printer will require more frequent cleaning.
Excessive lubricant attracts dust and accumulations build up quickly. An accumulation of paper dust is the
most frequent cause of print quality problems in a dot matrix printer.
3.5.02 Lubrication Schedule
Routine inspection and lubricating should be performed:
1. once a year
or
2. every 600 hours of operating time.
3.5.03 Lubrication Types
1. Machine Oil or equivalent
2. Moly-lube Grease or equivalent
3.5.04 Lubrication Amounts
Do NOT over-lubricate the printer. Operational problems are caused by excess lubricant. The excess
lubricant causes dust to accumulate. These accumulations can jam gears or cause print problems.
The Lubrication Table will direct you to use the following amounts of lubricant.
1. Medium
Oil: three to four drops
Grease: thin coating (approximately .015 inch)
2. Small
Oil: one drop
Grease: extremely thin coating (approximately .008 inch)
3.5.05 Lubrication Table
