Komatsu 730E User Manual (English)

Other manuals for Komatsu 730E

Shop Manual51 pages

Brochure4 pages

Questions and Answers:

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Alexander LongAug 20, 2025
What to do if the Komatsu Trucks pump does not operate?
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  Frank FoxAug 20, 2025
  If the Komatsu Trucks pump does not operate, several issues could be the cause. First, check if the lubrication system is properly grounded and correct any grounding connections to the pump assembly and truck chassis. Then check for electrical power loss, ensuring the key switch is on and that the system receives 24VDC power. If power is not the issue, the timer, solenoid valve, or relay may be malfunctioning, in which case you should replace the respective assembly or relay. Finally, there may be a motor or pump malfunction, requiring repair or replacement of the motor and/or pump assembly.
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Laurie PatelAug 22, 2025
Why is my Komatsu Trucks pressure gauge not registering pressure?
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  Nicholas MannAug 22, 2025
  If the pressure gauge on your Komatsu Trucks is not registering pressure, first check the hydraulic hose from the steering system to ensure there is system pressure to the pump motor. Also, verify that there is a 24VDC signal at the pump solenoid. If not, identify the problem in the 24VDC electric system. It's also possible that the pressure reducing valve is set too low, and in that case, the relay should be replaced.
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Ashley DiazAug 25, 2025
What to do if Komatsu 730E Trucks bearing points are not sufficiently lubricated?
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  Frank AnthonyAug 25, 2025
  If the bearing points on your Komatsu Trucks are not sufficiently lubricated, it could be due to several reasons. First, check the timer/controller cycle time setting and ensure it is not too low; if it is, set a longer cycle time or re-evaluate the lubrication requirements. Also, verify that the injector output adjustment setting is not too low, and readjust it if necessary. If the cycle time doesn't deliver lubricant often enough, set a shorter cycle time or re-evaluate lubrication needs. Lastly, the system might be too large for the pump output, so calculate the system requirements.
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Kathryn LarsonAug 26, 2025
Why is my Komatsu Trucks pump will not build pressure?
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  Christopher PottsAug 26, 2025
  If your Komatsu Trucks pump will not build pressure, there are several potential causes. The first is air trapped in the lubricant supply line; prime the system to remove any trapped air. Another cause could be a leak in the lubricant supply line, so check the lines and connections to repair any leakage. Additionally, the vent valve may be leaking, requiring cleaning or replacement. Lastly, the pump may be worn or scored, necessitating repair or replacement of the pump assembly.
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Tyler SmithAug 28, 2025
How to fix Komatsu 730E bearing points excessively lubricated?
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  Joseph GrayAug 28, 2025
  To fix excessively lubricated bearing points on your Komatsu Trucks, ensure that the controller memory mode is switched on. If it is off, switch it on. Additionally, check the injector output adjustment setting and readjust it to a lower setting if it is too high.
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Clinton AndersonAug 29, 2025
What to do if the Komatsu Trucks pump will not prime?
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  Paula CooperAug 29, 2025
  If the Komatsu Trucks pump will not prime, it may be due to a low lubricant supply. Check for dirt in the reservoir, a clogged pump inlet, or a clogged filter.
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rivaschristinaAug 31, 2025
What to do if Komatsu Trucks injector indicator stem does not operate?
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  Aaron MarquezAug 31, 2025
  If the injector indicator stem on your Komatsu Trucks does not operate, it could be due to a malfunctioning injector, typically indicated by the pump building pressure and then venting; in this case, replace the individual injector assembly. Alternatively, if all injectors are inoperative, the pump build-up may not be sufficient to cycle the injectors, requiring service and/or replacement of the pump assembly.
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Jacob SmithSep 2, 2025
What to do if Komatsu 730E controller does not operate?
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  Dan JacksonSep 2, 2025
  If the Komatsu Trucks controller does not operate, ensure that there is electric power to the pump controller. The Power LED must light, and the Pump On LED must light when manual lubrication is pressed.
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Elizabeth KellySep 3, 2025
What to do if Komatsu 730E Pump On LED lights, but load connected to terminals 3 & 4 will not energize?
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  Diana OrtizSep 4, 2025
  If the Pump On LED lights on your Komatsu Trucks, but the load connected to terminals 3 & 4 will not energize, it indicates a printed circuit board failure. The solution is to remove and replace the printed circuit board.
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Matthew TaylorSep 5, 2025
Why does the pressure gauge on my Komatsu 730E Trucks not register pressure?
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  Carrie FieldsSep 5, 2025
  If the pressure gauge on your Komatsu Trucks doesn't register pressure, consider these possibilities: * There may be no system pressure to the pump motor: Check the hydraulic hose from the steering system. * There may be no 24VDC signal at the pump solenoid: Investigate the 24VDC electric system to determine the problem. * The pressure reducing valve may be set too low: Refer to the Pressure Control Valve Adjustment guide. * The 24V Relay (RB7K8 or RB7K5) may be defective: Replace the relay.