Hitachi ZX40U-2 User Manual (English)

Questions and Answers:

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wbaileyAug 19, 2025
How to troubleshoot a Hitachi ZX40U-2 engine that does not start?
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  cristinayoungAug 19, 2025
  If your Hitachi Excavator's engine won't start, several issues could be the cause. It could be due to a dead battery, in which case you should recharge or replace it. A faulty starter might also be the culprit, requiring repair or replacement. Check for loose or corroded connections and clean/tighten them. If the engine is too cold, preheat it by warming up the coolant. Air in the fuel system can also prevent starting, so thoroughly bleed the air. Make sure there is enough fuel, and if the fuel filter is restricted, clean or replace it.
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Jade FreemanAug 21, 2025
Why does my Hitachi ZX40U-2 Excavators engine overheat?
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  jjohnsonAug 21, 2025
  If your Hitachi Excavator engine overheats, it could be due to several reasons. First, check the coolant level and look for any leaks, adding coolant and repairing any leaks as needed. Next, inspect the fan belt for looseness or oil contamination; adjust or replace it accordingly. Also, inspect the radiator fins for clogging or bending, clean or repair them. Finally, a malfunctioning thermostat can cause overheating, so consider replacing it.
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Melissa EvansAug 25, 2025
What to do if my Hitachi Excavators engine stalls?
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  Benjamin MelendezAug 25, 2025
  If your Hitachi Excavator engine stalls, it could be due to a lack of fuel in the fuel tank, so refuel. Another potential cause is air in the fuel system, in which case you should re-tighten the connections and bleed the system.
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adamedwardsAug 26, 2025
Why won't the starter rotate on my Hitachi Excavators?
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  Angela GibsonAug 26, 2025
  If the starter on your Hitachi Excavator doesn't rotate, it could be due to a few reasons. A harness failure could be the cause, so inspect and repair it. Low battery power can prevent the starter from working, so charge the battery. Loose or corroded battery connections can also be the problem, so clean and tighten them. Lastly, a faulty key switch could be the issue, requiring replacement.
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debra79Aug 28, 2025
Why is my Hitachi ZX40U-2 Excavators engine knocking?
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  Alicia PerryAug 28, 2025
  If your Hitachi Excavator engine knocks or runs irregularly, the fuel filter might be restricted, so clean or replace it. Air in the fuel system could also be the cause, so re-tighten the connections and bleed the system. Another possible reason is a restricted air cleaner, so clean or replace the element.
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Hannah MartinezAug 30, 2025
What causes low engine oil pressure in Hitachi ZX40U-2 Excavators?
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  Lisa RussellAug 30, 2025
  If you notice low engine oil pressure in your Hitachi Excavator (the engine oil pressure indicator comes on), it could be due to insufficient engine oil, so add oil. Check for oil leaks at the connections and repair them if necessary. It could also be due to a faulty oil pressure switch, so replace it.
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Tyler EatonSep 1, 2025
Why does the alternator indicator stay on in my Hitachi ZX40U-2 Excavators?
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  jennifer32Sep 1, 2025
  If the alternator indicator on your Hitachi Excavator doesn't turn off after starting the engine, it could be due to alternator failure, so replace it. Another possible cause is harness failure, in which case you should inspect and repair it.
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Cynthia BergSep 3, 2025
Why aren't the monitor indicators working on my Hitachi ZX40U-2?
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  Paul YoderSep 3, 2025
  If the monitor indicators on your Hitachi Excavator don't come on, or the gauges don't operate, it could be due to a blown fuse, so replace it. A sensor failure could also be the cause, so replace the sensor. Another possibility is harness failure, so inspect and repair the harness. Finally, burned indicator bulbs could be the issue, so replace them.
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Roger WrightSep 5, 2025
Why does my Hitachi ZX40U-2 Excavators not travel smoothly?
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  David HarperSep 5, 2025
  If your Hitachi Excavator doesn't travel smoothly, there are several potential causes: * The track might be too tight (sag), so adjust the track sag. * Foreign matter, like rocks, might be stuck in the tracks, so remove it. * A counterbalance valve failure could be the problem, so replace it. * The travel motor performance might have dropped, so replace it.
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Joshua PruittSep 7, 2025
What causes a Hitachi Excavators to mistrack?
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  Javier LewisSep 8, 2025
  If your Hitachi Excavator is mistracking, it could be due to unequal track sag on both sides, so adjust the track sag properly and equally on both sides. Another cause could be hydraulic pump performance drop, so replace the pump. An oil leak inside the control valve might also be the issue, so replace the control valve.

Hitachi ZX40U-2 Specifications

General

Engine Model	Yanmar 3TNV88
Operating Weight	4080 kg
Engine Power	37.4 hp
Max Digging Depth	3470 mm
Height	2500 mm
Max Dumping Height	4, 270 mm
Transport Height	2500 mm