Description
CAT 4L-3748 Pump Bearing Retainer
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The CAT 4L-3748 is a Caterpillar genuine crankshaft front oil seal retainer assembly, adapted for the front of diesel engines. It positions and secures the front crankshaft oil seal, preventing oil leakage and dust intrusion. The following is raw data only and does not include replacement parts information.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes
Model: 4L-3748; Type: Crankshaft Front Oil Seal Retainer Assembly; Material: Q345B steel plate stamping + 45# steel locating ring; Single weight: 0.85 kg; Suitable for engine speeds ≤2200 rpm; Operating temperature: -40℃ to +150℃; Installation torque: 35-40 N・m; Used to fix the crankshaft front oil seal, preventing axial movement and seal failure; Suitable for Cat C7.1, C9.3, and other engines.
Key Dimensions (Metric/Imperial):
Outer diameter: 165.0 mm (6.496 in, tolerance ±0.15 mm); Inner diameter: 105.0 mm (4.134 in, tolerance 0/-0.025 mm); Total thickness: 12.0 mm (0.472 in, tolerance ±0.10 mm); Locating pin diameter: 8.0 mm; Number of bolt holes: 6 1 bolt hole diameter: 140.0 mm; locating ring height: 5.0 mm; clearance with oil seal: 0.05-0.10 mm.
Performance Parameters: Surface galvanized and passivated; resistance to neutral salt spray ≥480 h; locating ring hardness: HRC 40-45; steel plate tensile strength ≥510 MPa; sealing surface flatness ≤0.05 mm; compatible with fluororubber/nitrile rubber oil seals; can withstand engine vibration and temperature shock; no deformation or corrosion after long-term use.
Structure and Compatibility Characteristics:
Combined structure design: Stamped steel plate provides rigid support; locating ring precisely positions the oil seal; 6 evenly distributed bolt holes ensure coaxial installation and prevent eccentric wear of the oil seal; suitable for installation in confined spaces at the front of the engine.
Sealing and Protection Function: Tightly fits with the crankshaft front oil seal to form a radial seal, preventing oil leakage along the crankshaft axial direction, while also blocking external dust and moisture from entering the crankcase, protecting the crankshaft and bearings from contamination.
Operating Condition Compatibility: Suitable for low-to-medium speed and vibration conditions of diesel engines; resistant to corrosion from engine oil, antifreeze, and other media; compatible with CAT universal engine oils and greases; requires no additional adjustments after installation; easy to maintain.
Installation and Maintenance Points (Original Data)
Installation: Clean the crankshaft front end and retainer sealing surface (free of oil stains and burrs); install the locating pins for positioning; tighten the bolts to the specified torque in 2-3 steps diagonally; check that the oil seal and retainer fit tightly, without misalignment and with uniform gaps.
Maintenance: Check the tightness of the retainer bolts and the oil seal every 2000 hours; replace if oil leakage or retainer deformation is found; for long-term storage, apply anti-rust oil to seal and prevent corrosion of the locating ring and steel plate.
