Description
The Fleetguard AF55321 is a genuine inner safety air filter element designed for Bobcat compact track loaders and skid steer loaders equipped with Doosan D24 diesel engines. This Direct Flow panel-style secondary filter provides critical backup protection for your engine, capturing fine particles that pass through the primary outer element. Fleetguard is the OEM filtration supplier for Cummins and produces filters engineered to meet or exceed original equipment specifications for maximum engine protection.
Signs You Need a New Inner Air Filter
- Restricted airflow warning or reduced engine power
- Visible dirt, dust, or debris on the filter media
- Filter media is torn, damaged, or has holes
- Primary outer filter failed or was damaged, allowing contaminants to reach the inner element
- Service interval reached (replace every 1,000 hours or per manufacturer recommendations)
- Dusty or dirty operating conditions requiring more frequent replacement
- Black smoke or poor combustion indicating restricted air intake
- Engine running rough or losing power under load
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | AF55321 |
| Part Type | Inner Safety Air Filter Element |
| Filter Style | Direct Flow Panel |
| Overall Length | 146.6 mm (5.772 in) |
| Overall Width | 141.1 mm (5.555 in) |
| Overall Height | 38.1 mm (1.5 in) |
| Used With | AF55030 (Outer Primary Element) |
| Service Interval | 1,000 Hours (or as conditions require) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Fleetguard: AF55321
- Cummins: 5310324
- Bobcat: 7221934
- Baldwin: PA31014
- Donaldson: P636750
- Hyundai: 1DFQ20130
- Wix: WA11083
Applications
This inner safety air filter fits Bobcat compact equipment with Doosan D24 (2.4L) diesel engines:
- Bobcat Skid Steer Loaders: S450, S510, S530, S550, S570, S590, S595, S630, S650
- Bobcat Compact Track Loaders: T450, T550, T590, T595, T630, T650, T870
Primary and Safety Filter System
This AF55321 is the inner safety element that works together with the AF55030 outer primary filter in Bobcat’s Direct Flow air cleaner system. The primary outer filter (AF55030) captures the majority of airborne contaminants, while this inner safety filter provides secondary protection to prevent engine damage if the primary element is compromised. Both elements should be inspected at each service interval and replaced as needed to maintain proper engine protection.
Replacement Guidelines
Replace the inner safety filter every 1,000 operating hours under normal conditions, or more frequently in dusty environments. Always inspect the inner element when replacing the outer primary filter. If the inner element shows contamination, both filters should be replaced and the air intake system should be inspected for leaks or damage that allowed unfiltered air to bypass the primary element.
Filter applications may vary by serial number. Verify your equipment’s serial number and engine configuration to confirm proper fitment before ordering.
