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5-1
CHAPTER 5: PREVENTIVE MAINTENANCE AND TROUBLESHOOTING
5.1 Preventive Maintenance
Preventive Maintenance (PM) procedures are contained in McDonald’s Preventive Maintenance
System Maintenance Requirement Cards (MRC) 12, 14, 14A, and 15. The cards are distributed with
this manual, but are not an integral part of the manual. A replacement card set may be ordered using
part number 819-5432. To order both the card set and the Operator’s Manual, use part number 819-
5569. To order both the card set and the Service Manual, use part number 819-5625.
In addition to maintenance referenced in MRC cards, Frymaster recommends that the fryer be
inspected at least annually by a Factory Authorized Service Technician as follows:
• Inspect the cabinet inside and out, front and rear for excessive oil build-up and/or oil migration.
• Verify that the heating element wires are in good condition and that leads have no visible fraying
or insulation damage and that they are free of oil migration build-up.
• Verify that heating elements are in good condition with no carbon/caramelized oil build-up.
Inspect the elements for signs of extensive dry-firing.
• Verify that the tilt mechanism is working properly when lifting and lowering elements, and that
the element wires are not binding and/or chafing.
• Verify the heating-element amp-draw is within the allowed range as indicated on the appliance’s
rating plate.
• Verify that the temperature and high-limit probes are properly connected, tightened and
functioning properly, and that mounting hardware and probe guard are present and properly
installed.
• Verify that component box and contactor box components (i.e. computer/controller, relays,
interface boards, transformers, contactors, etc.) are in good condition and free from oil migration
build-up and other debris.
• Verify that component box and contactor box wiring connections are tight and that wiring is in
good condition.
• Verify that all safety features (i.e. contactor shields, drain safety switches, reset switches, etc.) are
present and functioning properly.
• Verify that the frypot/cookpot is in good condition and free of leaks and that the frypot/cookpot
insulation is in serviceable condition.
• Verify that all wiring harnesses and connections are tight and in good condition.
• Inspect all oil-return and drain lines for leaks and verify that all connections are tight.