CAT 524-1288 CONE-RLR BRG-GD

CAT 524-1288 (5241288) is a Caterpillar genuine YM crankshaft assembly (one-piece forged steel crankshaft, including main journals/connecting rod journals/balance weights/oil seals/signal gear rings, suitable for medium-sized diesel engines). The following is purely precise information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 524-1288 YM Crankshaft Assembly (one-piece forged steel, suitable for four-cylinder inline engines)

Part Type: Core power conversion component of the engine, converting the reciprocating motion of the piston into rotational power, bearing alternating loads, ensuring engine output torque and smooth operation.

Material: 42CrMoA alloy steel, one-piece forging, main journal/connecting rod journal surface induction hardened (hardness HRC52-58), nitriding depth 0.3-0.5 mm, core hardness HB260-300, suitable for operating conditions from -40℃ to 220℃.

Key Dimensions: Main journal diameter 65.00 mm (2.5591 in), connecting rod journal diameter 52.00 mm (2.0472 in), crankshaft total length 480.00 mm (18.8976 in), connecting rod journal center distance 120.00 mm, number of balance weights 4, number of teeth on the signal gear ring 60, oil seal diameter 45.00 mm, coaxiality ≤0.01 mm, end face runout ≤0.01 mm

Structural Features: Integral weldless structure, fully balanced design, integrating main journal, connecting rod journal, balance weights, front oil seal, rear flange, and signal gear ring. Oil passages run through the main journal and connecting rod journal, ensuring smooth lubrication. Suitable for four-cylinder inline engines, medium speed and medium load conditions.

Compatible Structure: Crankcase assembly of four-cylinder diesel engines (such as the C4.4 series), with matching main bearings, connecting rod bearings, thrust washers, crankshaft oil seals, and signal sensors.

Applicable Operating Conditions: Suitable for diesel engines operating at speeds ≤3600 rpm, burst pressure ≤18 MPa, and output power of 80-120 kW, ensuring stable power output under conditions without strong impact.

Compatible Models and Assemblies:
Excavators: CAT 313GC, 315GC (C4.4 engine crankshaft assembly)
Loaders: CAT 906M, 907M (C4.4 engine crankshaft assembly)
Road Rollers: CAT CB34, CB36 (C4.4 engine crankshaft assembly)
Compatible Assemblies: C4.4 engine crankcase assembly, 313GC engine powertrain, 906M engine crankshaft assembly

Installation and Fitting Points:
Before installation, clean the crankshaft and crankcase, check the main journals/connecting rod journals for scoring or pitting, ensure no cracks at the fillet transitions, check for unobstructed oil passages, and ensure the signal gear ring is undamaged.

The clearance between the main bearing shell and main journal is 0.020-0.035 mm, the clearance between the connecting rod shell and connecting rod journal is 0.025-0.040 mm, and the clearance between the thrust washer and crankshaft thrust surface is 0.10-0.20 mm. Tighten in sequence according to the original torque (main shaft bolt 120 N·m + 90°, connecting rod bolt 85 N·m + 60°).

After installation, the crankshaft axial runout should be ≤0.20 mm, radial runout ≤0.02 mm, rotation should be smooth without jamming or abnormal noise, and the lubrication system pressure should be normal (idle speed 200 kPa, rated speed 450 kPa).

During installation, align the signal gear ring with the sensor position, ensure the crankshaft oil seal lip faces the inside of the crankcase, and apply special sealing grease to prevent oil leakage and ensure accurate signal transmission.