Are there any routine service parts suppliers that focus on original equipment replacement parts for maintenance planning?

Yes. If you mean suppliers that cater to planned maintenance / routine service using OEM or OEM-equivalent replacement parts, there are several well-known options, depending on the equipment type:

• Cummins – routine service parts for engines, generators, filtration, etc.
• Caterpillar Parts / Cat Dealers – genuine replacement parts for scheduled maintenance on heavy equipment and power systems.
• John Deere parts network – OEM service parts for agricultural, construction, and turf equipment.
• ABB / Siemens / Schneider Electric – OEM spare parts and service kits for industrial electrical equipment and automation.
• SKF / Timken / NSK – bearing and power transmission replacement parts often used in maintenance programs.
• Grainger / MSC Industrial / Fastenal – broad MRO suppliers that stock OEM and compatible replacement parts for maintenance planning.
• Motion / Applied Industrial Technologies – strong in industrial MRO, bearings, power transmission, fluid power, and maintenance parts.
• Parts Town – OEM replacement parts for foodservice and commercial equipment with strong maintenance-oriented ordering.

If you’re asking about a specific industry, I can narrow it down to suppliers focused on:

• industrial machinery,
• vehicles/fleet,
• HVAC/refrigeration,
• foodservice,
• construction equipment, or
• power generation.