Description
A837 / A837X POWER CLUSTER – AIR/HYDRAULIC ACTUATOR
PART NUMBER(S):
Fleet Products: A837X, A837 | OE: FE4570, CAT 9K0735
DESCRIPTION:
Model: A837 / A837X – Power Cluster
Vehicles: Heavy-Duty Trucks and Trailers
• Air Chamber Diameter: 5″
• Air Chamber Length: 4″
• Master Cylinder Casting #: FE4570
• Condition: Remanufactured
• Core Return: Required (A837X only)
• Actuation Type: Air/Hydraulic – uses compressed air to generate hydraulic brake force
• Function: Power cluster for air-over-hydraulic brake systems in heavy-duty vocational, trailer, and transport vehicles
• Build Standard: Remanufactured to OEM specifications
• Quality Control: Units are disassembled, cleaned, inspected, and fully tested for performance and durability under heavy-duty brake system conditions
• Unique Features:
– Direct replacement for master cylinder casting # FE4570
– Compact actuator size for installation in limited-space chassis or axle layouts
– Engineered for reliability in demanding brake actuation environments
Applications:
Engineered as an OEM-style replacement for legacy air/hydraulic systems, this actuator is intended for use in space-constrained or lightweight platforms where full pneumatic systems are not viable. Ideal for vocational equipment, agriculture, and medium/heavy-duty truck and trailer configurations.
CROSS-REFERENCE(S):
A837X, A837, FE4570
A cross-reference listing means the part can be used as a direct or functional replacement for the listed part numbers.
IMPORTANT INSTALLATION NOTES:
✔ A837X is a remanufactured actuator – core return is required
✔ Ensure compatibility with FE4570 master cylinder configuration
✔ Use DOT 3, DOT 4, or mineral-based hydraulic brake fluid, as specified by system design
✔ Mounting orientation and air line routing must prevent contamination and retain air chamber seal integrity
✔ Bleeding required after installation – verify hydraulic system is free of trapped air
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
WHY CHOOSE FLEET PRODUCTS | KBR - HEAVY DUTY TRUCK & TRAILER PARTS?
• Canadian-owned since 1985
• Trusted by fleets, mechanics, and B2B partners across North America
• Fast, Reliable Shipping Across North America
• Competitive pricing with Core Return Refunds
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Warranty Information
