CAT 320D & 330D Engine Mount Anti-Vibration Parts

CAT 320D and 330D Engine Mount Overview

The Caterpillar 320D and 330D are the dominant mid-size and large excavators in the North American construction market. Powered by CAT C7.1 and C9.3 ACERT diesel engines, these machines require precisely matched engine anti-vibration mounts to control the significant vibration forces generated at typical construction site operating conditions (2,000–2,200 RPM continuous digging cycle).

The primary engine mount for the CAT 320D series is part 211-4987, which isolates the C7 and C9 engine block from the main frame through a bonded rubber-to-steel assembly. Part 227-0172 serves the 320D2 and 323D variants, while 358-0286 covers the larger 336 and 349 platforms.

CAT 320D Engine Mount Part Number Reference

Part Number	CAT Models	Engine	Application
211-4987	320B, 320C, 320D; 325B, 325C, 325D; 330B, 330C, 330D	C7, C9 ACERT	Engine Mount (primary)
227-0172	320D, 320D2, 323D, 323D2; D6K, D6N, D6R, D7E, D7R	C7.1, C9.3 ACERT	Anti-Vibration Cushion
358-0286	336, 336D2, 340, 349; 773, 775, 777; D8R, D9R, D10T	C13, C15, C18	Engine Mount (heavy duty)

CAT 320D Engine Mount Inspection & Replacement Interval

Caterpillar recommends engine mount inspection every 1,000 service hours on 320D and 330D machines. Replacement is typically needed at 4,000–6,000 operating hours under normal North American construction conditions. In high-idle applications (demolition, rock breaking, pipelining), the interval may be reduced to 3,000 hours due to higher peak loads.

Indicators requiring immediate engine mount inspection on CAT 320D/330D excavators:

• Ground-level vibration — operator feels engine vibration through the seat and floor even at high idle
• Hose chafing near the engine area — vibration damage from failed mounts causes premature hydraulic hose wear
• Cracked rubber — visible on physical inspection; any crack depth greater than 1 mm requires immediate replacement
• Engine misalignment — symptoms include drivetrain noise or coupling wear due to engine shifting on failed mounts

CAT C7.1 and C9.3 ACERT Engine Vibration Profile

The C7.1 and C9.3 ACERT engines used in the CAT 320D2 and 323D2 exhibit a distinct second-order excitation at typical dig cycle speeds, requiring careful engine mount stiffness selection to prevent resonance at 1,400–2,200 RPM. Part 227-0172 has been specifically validated against the vibration profile of these engines. Our aftermarket replacements maintain the same stiffness specification — verified by dynamic bench testing — to ensure the same isolation performance as the OEM part.

Ordering CAT 320D Engine Mounts for USA Delivery

CAT 320D and 330D engine mount parts ship from our Turkey manufacturing facility to US destinations within 3–5 business days dispatch, with 5–7 day transit to the US East and West Coasts via DHL Express. All shipments include commercial invoice, packing list, and HS code 4016.99 classification. Certificate of Conformance and Material Test Report available on request.