Description
A837 / A837X POWER CLUSTER – AIR/HYDRAULIC ACTUATOR
PART NUMBER(S):
Fleet Products: A837 (New), A837X (Remanufactured) | Replaces OE: Bendix FE4570, L35635, L31260, ASS# L12609 | Caterpillar 9K0735 | Other CAST# AE1111
DESCRIPTION:
Model: A837 / A837X – Brake Actuator Power Cluster with Master Cylinder 5" long X 1-1/4" dia. (FE4570)
Vehicles: Heavy-Duty Trucks and Trailers
• Type: Air-over-hydraulic brake booster
• Application: Heavy-duty vocational, trailer, and transport brake systems
• Dimensions: 5.00 in air chamber diameter
• Dimensions: 4.00 in air chamber length
• Master Cylinder Casting: FE4570
• Mounting: Compact chassis installation
• Material: Remanufactured assembly
• Performance: Air-over-hydraulic actuation
• Features: Compact actuator design, OEM-spec replacement, cleaned, inspected, and tested for heavy-duty service
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, L35635 , L31260 # L12609
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.
Warranty Information
