Rigid Dump Truck Repair Cost
A engine rebuild / replacement on a Komatsu HD785-8 typically runs $28,900-$105,150 all in. Below is the labor and parts breakdown, what drives the cost up or down, and how to get an exact number for your machine.
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Komatsu HD785-8 engine rebuild
$28,900-$105,150
estimated total, parts and labor
Labor hours
43-108 hrs
Shop rate
$125-$175/hr
Parts
$23,500-$86,250
* Static estimate from heavy-equipment norms, not a quote. Real cost depends on parts source, access, and collateral damage.Get an exact estimate →
Pulling the engine (or doing an in-frame), inspecting the block, and replacing pistons, rings, bearings, gaskets and seals, or dropping in a reman long block. Tier 4 emissions hardware (DPF, EGR, aftertreatment) adds labor and parts on newer machines.
The range above moves with these factors. The biggest swing is usually parts source and whether the failure damaged anything downstream.
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A engine rebuild repair at $28,900-$105,150 is usually worth it on a Komatsu HD785-8, but it pays to know the machine's current value first.
See Komatsu HD785-8 resale value →