CAT 434-2399 BEARING-SLV-GD

CAT 434-2399 YM is a Caterpillar original equipment manufacturer (OEM) C15/C18 engine front accessory drive (FEAD) dedicated pulley bracket. It is used to secure the fan pulley/idler pulley and is compatible with C15 ACERT, C18, and other engines. It is a key structural component in the FEAD system that ensures pulley positioning and transmission stability.

Core Parameters (Original Manufacturer Nominal)

Item Details
Part Model: CAT 434-2399 YM (4342399) Pulley Bracket
Material: Q345B low-alloy high-strength steel, integral stamping + welding, powder-coated surface, salt spray resistance ≥480h, tensile strength ≥345MPa, hardness HB180-220
Key Dimensions: Mounting hole center distance 76.2mm (3in), mounting surface flatness ≤0.05mm, locating pin hole φ12mm, bolt hole M12×1.75, bracket height 120mm, single arm thickness 8mm
Compatible with: C15 ACERT, C18 engine FEAD system; compatible pulley models: 434-2398, 434-2397; common machines: Caterpillar 349D excavator, 777F mining truck, C15 Generator Set

Features and Characteristics: Positioning accuracy ±0.02mm, radial load ≤5kN, temperature resistance -40℃ to 120℃, suitable for continuous operation and impact conditions.

Installation Method: Bolt fastening; fixed to the front housing of the engine front gear chamber with two M12×1.75 bolts, with locating pins for auxiliary positioning.

Weight: Approximately 1.2kg (2.65lbs)

Suitable Applications:

Pulley Positioning Installation: Fixed to the front housing of the engine front gear chamber (e.g., 245-3683), used to support the fan pulley or idler pulley, ensuring the coaxiality of the pulley with the crankshaft pulley and water pump pulley, preventing belt misalignment and slippage, and reducing transmission system vibration.

Operating Conditions: Suitable for heavy-duty, high-vibration conditions such as heavy construction machinery, mining equipment, and generator sets, providing stable support for the FEAD system and ensuring the power transmission efficiency of accessories (fan, water pump, generator, etc.).

Compatibility: Uses with 434-2398 pulley, 436-6512 belt tensioner, and 245-3684 gasket; during replacement, simultaneously check pulley radial runout, bracket mounting surface flatness, and bolt torque.

Installation and Maintenance Points
Installation Steps:
Clean the mounting surface of the bracket and the contact surface with the front gear chamber housing; insert the locating pin and place the gasket (if applicable);
Align the bracket with the locating pin and pre-tighten with M12×1.75 bolts, tightening in two steps at a torque of 45-50 N·m in a crosswise manner;
Install the pulley, checking that the pulley radial runout is ≤0.05 mm, the belt tension meets the original manufacturer’s specifications, and there is no jamming during operation.

Maintenance Cycle: Check every 2000 hours under standard operating conditions; shorten to 1000 hours under harsh operating conditions (high dust, high temperature, high vibration), focusing on checking bolt torque attenuation, bracket deformation, and leakage at the mounting surface.

Replacement criteria: If the bracket has cracks, the flatness of the mounting surface exceeds 0.1mm, the bolt hole is stripped, or the locating pin hole is worn beyond 0.08mm, it must be replaced and cannot be repaired.