CAT 087-4970 SLEEVE

CAT 087-4970 is a Caterpillar genuine straight steel wear-resistant sleeve (shroud/bulb), suitable for hydraulic cylinders or pin parts in heavy machinery such as excavators and loaders, used for wear protection and precise positioning. The following are the original factory specifications and application information; replacement parts are not included.

Core Technical Parameters

Item Details
Part Model: CAT 087-4970 (Straight Steel Sleeve, Flangeless)

Material: Base material: 4140 chromium-molybdenum steel, nitrided surface, surface hardness HV 850-1000, nitriding layer depth 0.3-0.5 mm; smooth inner wall, Ra ≤ 0.08 μm, excellent wear resistance and fatigue resistance

Key Dimensions: Inner diameter 85 mm (3.346 in), outer diameter 95 mm (3.740 in), total length 80 mm (3.150 in), wall thickness 5 mm, chamfered ends 0.5×45°, suitable for standard pins and cylinder lug bores

Single Weight: Approx. 0.39 kg (0.860 lbs)

Tolerances: Inner diameter tolerance H7 (+0.030/0 mm), outer diameter tolerance h8 (0/-0.040 mm), length tolerance ±0.15 mm, perpendicularity tolerance ≤ 0.02 mm/100 mm
Core Features: Wear-resistant, impact-resistant, operating temperature -40℃ to +120℃, suitable for reciprocating motion of hydraulic cylinders or rotating pins. An oil film can be stored on the inner wall to reduce the coefficient of friction (≤ 0.005), extending the service life of the pin and cylinder lug.
Structure and Core Functions:
Wear Protection: High-hardness nitrided steel surface isolates the pin and cylinder lug from direct metal-to-metal contact, preventing wear and scoring, suitable for heavy-duty, high-frequency reciprocating operations.

Positioning and Guiding: Precise dimensional tolerances ensure coaxiality of the pin and lug, reducing off-center loading, lowering operating noise and vibration of the cylinder or pin, and improving mechanical operational stability.

Lubrication Compatibility: Smooth inner wall allows for the formation of an oil film with lithium-based grease (NLGI 2 grade), reducing friction and meeting the lubrication needs of harsh operating conditions in construction machinery.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 320C and 323D excavators, 966H and 972H loaders, and boom cylinder, stick cylinder lugs, or pins on some road machinery.

Core Purpose: Installed between the hydraulic cylinder lugs and pins to withstand radial loads and reciprocating friction, suitable for heavy-duty operations such as excavation and loading in construction machinery, ensuring the durability of the hydraulic system and structural components.