CAT 361-1713 Draft Frame Trunnion

CAT 361-1713 is a Caterpillar original YM (Yoke Mounted) forklift mounting trunnion used in the articulation parts of engineering machinery to bear radial loads and oscillation functions. The following is the structured original data, excluding replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 361-1713, Type YM Forklift Mounted Solid Trunnion, Material 42CrMo Alloy Steel, Tempered + Surface Hardened, Journal Hardness HRC 52-58, Core Hardness HRC 28-35, Single Weight 5.8 kg, Operating Temperature -40℃ to +120℃, Lubrication Method Grease Lubrication, Suitable for Low to Medium Speed ​​Oscillation Conditions (≤±45°), Used in Boom, Stick, and Frame Hinge Parts

Key Dimensions
Junior Diameter 70 mm (2.756 in), Mounting Outer Diameter 90 mm (3.543 in), Overall Length 150 mm (5.906 in), Journal Length 80 mm (3.150 in), Flange Diameter 120 mm (4.724 in), Flange Thickness 15 mm (0.591 in), Bolt Holes 4×φ14 mm (circumferential distribution, center distance 100 mm), chamfered ends 2×45°, journal tolerance h6, mounting surface flatness ≤0.01 mm, bushing clearance 0.015-0.030 mm
Compatible Models and Parts: Compatible with Cat 320, 323 excavators, 420F2, 430F2 loaders, and 446E backhoe loaders (boom lower hinge point, stick upper hinge point, frame hinge pins), one piece per part, bearing radial load + impact load, compatible swing angle ≤±45°, speed ≤100 r/min
Performance Parameters: Radial load capacity ≥120 kN, fatigue life ≥8000 hours, tensile strength ≥900 MPa, yield strength ≥750 MPa, impact toughness ≥50 J/cm², coefficient of friction ≤0.06 (grease lubrication), wear rate ≤0.003 mm/1000 mm/cm² Hourly
Structural and Performance Advantages
High-Strength Material and Heat Treatment: 42CrMo alloy steel, tempered and surface-hardened, ensures wear-resistant journals and good core toughness, suitable for frequent impacts and oscillations in engineering machinery, reducing the risk of bending and breakage.

YM Forklift Mounting Design: Flange + bolt hole structure ensures precise installation positioning, tight forklift fit, reduced loosening and uneven loading, improved stability of hinged parts, and easy quick disassembly and maintenance.

Precision Dimension Control: Journal tolerance h6 ensures precise clearance, flexible and jam-free oscillation, reduced vibration and noise, and extended lifespan of bushings, pins, and other peripheral components.

Original Manufacturer Compatibility Guarantee: Manufactured by Caterpillar, dimensions and mounting positions are perfectly matched, avoiding assembly difficulties or premature wear due to tolerance deviations, ensuring equipment operational reliability.

Installation and Maintenance Points (Original Data)

Installation Procedure: Clean the trunnion, bushing, and mounting surfaces. Apply 85 N·m torque to the flange bolts (M12×1.75, grade 8.8). After installation, check that the journal roundness is ≤0.01 mm, there is no jamming, and the bolts are not loose.

Maintenance Cycle: Check the grease nipple for blockage every 200 hours. Add Cat 1U-8886 grease every 500 hours. Check the journal wear every 6000 hours; replace the journal when wear exceeds 0.10 mm.

Common Troubleshooting: Insufficient lubrication causing journal wear requires inspection of the lubrication system and grease replenishment; loose bolts causing uneven loading require retightening and inspection of the flange surface; scratched journals require replacement of the trunnion to avoid damaging the bushing.