Komatsu is one of the largest construction equipment manufacturers globally, with the PC200 and PC300 excavator series representing two of the highest-volume machines in the US construction industry. Komatsu engine mounts — also called engine cushions in Komatsu parts literature — are bonded rubber-to-steel components that isolate the diesel engine from the undercarriage frame. Correct specification and timely replacement of Komatsu engine mounts is essential for operator comfort, machine reliability, and structural longevity.
| Part Number | Machine Model | Application |
|---|---|---|
| 17A-54-46120 | PC200, PC200-6/7/8; PC300-7; D65E/P; D85E/P | Front Engine Cushion |
| 17A-54-46130 | PC200-6/7/8; PC270; PC300-7/8; WA320, WA380 | Rear Engine Cushion |
| 195-54-78412 | PC300-7/8; PC360-7; PC400-7/8; PC600-8 | Engine Cushion Block |
| 56B-50-12315 | WA320-5; WA380-6; WA430-6; GD555/655/675 | Engine Cushion B-Series |
| 56D-50-12314 | D65E/EX; D85E/P/EX; D155A/AX series bulldozers | Engine Mount D-Series |
Komatsu recommends inspecting engine mounts at each 1,000-hour service interval and replacing at 5,000 hours or at first sign of deterioration. In high-dust environments typical of US quarry and mining operations, UV exposure and rubber ageing can reduce actual service life to 3,000 hours. For PC200 and PC300 machines, replacing the 17A-54-46120 front and 17A-54-46130 rear cushions as a set is strongly recommended.
