CAT 241-3853 88.87mm Inner Diameter Sleeve Bearing Cap

CAT 241-3853 is a Caterpillar engine front gear chamber cover/camshaft end cover, used to seal the gear chamber and protect the internal gears and camshaft. It is compatible with Cat C7.1/C9 engines and is commonly found in excavators 320GC/323GC and loaders 950M. The following is professional structured information.

Core Technical Parameters (Professional Version)

Project Details
Basic Attributes: Model 241-3853, cast iron end cap, single weight 4.2 kg, 1 piece per unit, with 12 M10×1.5 bolts, sealing method is double sealing of rubber gasket + sealant, 2 locating pins (φ8 mm)

Key Dimensions: Outer diameter φ385 mm (tolerance ±0.3 mm), mounting surface flatness ≤0.05 mm, bolt hole distribution circle φ320 mm, sealing groove width 10 mm × depth 3 mm, locating pin hole φ8 H7, end cap thickness 25 mm (tolerance ±0.2 mm), surface roughness Ra≤3.2 μm

Material and Process: Material is HT250 gray cast iron, overall aging treatment to eliminate internal stress, surface electrophoretic coating (black, salt spray resistance ≥480 h), mounting surface precision milling, sealing groove accuracy ±0.1 mm, bolt hole thread accuracy 6H

Performance Parameters Operating temperature: -40℃ to +150℃; sealing pressure: ≥0.3 MPa; compatible sealant: Cat 5P-3931 anaerobic adhesive; withstands vibration frequencies of 5–2000 Hz and impact loads of ≤1000 N・m.
Compatible models: Engines C7.1, C9, C13; equipment includes excavators 320GC/323GC/330GC, loaders 950M/962M, and road rollers CS66B; fits at the front gear chamber of the engine (front of the camshaft).

Installation and maintenance points: Before installation, clean the end cover mounting surface and gear chamber mating surface, checking for cracks/deformation/rust. After installing the locating pin, apply 5P-3931 sealant (0.2–0.3 mm thickness), place the sealing gasket (material NBR, hardness 70 Shore A), and tighten the bolts in a crisscross sequence (torque 25). (N・m), excessive torque is prohibited to prevent end cap deformation.

Sealing Control: After installation, allow the sealant to cure for 30 minutes. Start the engine and check for leaks (oil pressure 0.4–0.6 MPa, oil temperature 80℃). If leaks are found, reinstall and replace the gasket.

Maintenance Requirements: Check the end cap tightness every 2000 hours. If bolts are loose (torque loss >10%), retighten them. Check the gasket for aging (cracks/hardening) every 5000 hours and replace it promptly.

Troubleshooting: If oil leaks/abnormal noises occur from the end cap, first check the flatness of the mounting surface (>0.1 mm requires milling repair), sealant failure, or wear inside the gear chamber. If necessary, replace the end cap and correct the coaxiality of the locating pin holes to ≤0.05 mm.