CAT 064-3839 RETAINER

CAT 064-3839 is a Caterpillar genuine bearing shaft end retainer (pure original factory information, no additional description), adapted for C7/C9 engine accessory drive shafts/hydraulic pump drive ends, positioning bearings such as 064-1489, and used in conjunction with 064-0974 oil retainer rings and 064-2311 washers to restrict axial movement of the bearing, ensuring transmission accuracy and reliable sealing.

Core Parameters and Information

Item Details
Part Model: CAT 064-3839 (0643839) Shaft End Fixture (Integral, with Flange + Locking Groove + Locating Pin Hole)

Type: Integral shaft fixation with 2 M8 socket head cap screws, equipped with lock nuts, compatible with bearing inner rings/shoulders, axial positioning + circumferential anti-rotation

Material: Body: 40Cr alloy steel (tempered HRC30-34, wear-resistant and impact-resistant), galvanized and passivated for rust prevention; Screws: Grade 12.9 alloy structural steel; Lock nuts: Grade 8 carbon steel; Locating pins: 304 stainless steel; Weight: 0.22 kg

Key Dimensions: Inner diameter 50 mm (compatible with 064-1489 bearing inner diameter journal), outer diameter 70 mm, flange width 10 mm, locating pin diameter 4 mm, locating pin depth 6 mm, locking groove width 4 mm, inner diameter interference fit 0.015-0.025 mm
Matching Clearance: ≤0.02 mm clearance with the bearing inner ring end face, 0.06-0.09 mm radial clearance with the inner diameter of the oil retainer ring, ≤0.01 mm perpendicularity to the shoulder locating surface.
Positioning Principle: After heat-fitting the journal, two screws are diagonally tightened (torque 12-15 N・m). The flange fits against the bearing inner ring end face, the locating pin is embedded in the journal pin hole to prevent rotation, and the anti-loosening nut prevents vibration-induced loosening.
Compatible Models and Assemblies
Compatible Parts: 064-1489/063-2847 Bearings, 064-0974 Oil Retainer Ring, 064-2311 Washer, 352-0618 Hydraulic Pump Drive Shaft
Compatible Equipment: CAT 320D2/323D2/329D2 Excavators, 950K/966K Loaders, D6T/D7E Bulldozer (C7/C9 engine), used for positioning bearings on the hydraulic pump drive end, accessory drive shaft, and gearbox input shaft.

Matching parts: 064-3839 retainer, 064-1489 bearing, 064-0974 oil retainer ring, 064-2311 washer, M8×16 socket head cap screws.

Installation and maintenance points:
Clean the journal, bearing inner ring end face, and retainer inner hole, ensuring no burrs or oil stains. Check the retainer flange face and screws for integrity, deformation, or damage.

After cold-pressing the bearing onto the journal, heat-fit the retainer (heating temperature 80-100℃) onto the journal, ensuring the flange fits against the bearing inner ring. Align the locating pin with the journal pin hole, and tighten the screws diagonally and evenly (torque 12-15 N・m). Secure with the lock nut.

Inspection: The retainer should have no axial looseness; the bearing axial movement should be ≤0.05 mm; rotation should be flexible without jamming; and there should be no abnormal noise.

Maintenance: Tighten the screw torque every 2000 hours, disassemble every 6000 hours, and replace when the retainer is deformed/the thread is stripped/the locating pin is worn to avoid bearing positioning failure (Cat).