

Hitachi Hydraulic Pump Maintenance Tips | Kyotechs
Kyotechs — Reliable Parts and Support for Hitachi Hydraulic Pumps
Kyotechs, established in 2009, offers a full range of excavator parts including Hitachi pumps, engines, valves, cylinders, and more. We provide One-Stop Hydraulic Repair and Engine Repair solutions to keep your machine running. Below are clear, practical maintenance tips specifically for Hitachi hydraulic pumps.
Daily and Weekly Checks
Regular quick checks prevent small problems from becoming major failures.
Daily
- Check hydraulic fluid level and top up if safe to do so.
- Look for visible leaks at pump connections, hoses, and seals.
- Listen for unusual noises—grinding or whining can indicate wear.
Weekly
- Inspect hoses, clamps, and mounting bolts for tightness and wear.
- Check hydraulic oil temperature during operation; overheating shortens pump life.
Fluid Cleanliness and Filters
Clean oil and good filtration are the most important factors in pump longevity.
- Use the correct grade of hydraulic fluid recommended for Hitachi systems.
- Replace suction and return filters on schedule; clogged filters reduce flow and increase wear.
- Consider routine fluid analysis to detect contamination early.
Common Trouble Signs and Quick Fixes
- Low pressure or slow operation: Check for clogged filters, low fluid, or worn pump elements.
- Overheating: Inspect cooler, fluid condition, and working load—reduce idling and heavy cycles.
- Leaks: Replace seals or hoses promptly; small leaks often signal seal wear and will worsen.
When to Use Kyotechs Professional Service
If you spot persistent noise, rapid performance loss, or internal damage, let our One-Stop Hydraulic Repair Solution inspect and repair your Hitachi pump. We supply genuine-quality parts, seal kits, and rebuild services to restore reliability and minimize downtime.
Final Tips
Keep a simple maintenance log, use quality parts, and schedule regular professional inspections. Kyotechs values your uptime—contact us for parts, service, or advice tailored to your Hitachi excavator.
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Kyotechs dealing with reputable brands in the industry signifies our commitment to offering reliable and top-notch products, instilling confidence in our customers regarding the quality of the components they purchase.
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We cater to a wide range of renowned brands such as Caterpillar, Cummins, Hyundai, Doosan, Hitachi, JCB, CASE Construction, CNH, Kobelco, Komatsu, and Volvo, showcasing our comprehensive understanding of the industry.
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Focusing on engine components adds a layer of specialization, making us a go-to source for clients seeking high-quality parts specifically for engines.
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Question you may concern
What to do if the hydraulic system pressure is low?
Check the hydraulic pump, pressure control valve, and hydraulic cylinders. Test the hydraulic oil for contamination or degradation, clean or replace relevant components, and ensure the hydraulic system is properly sealed.
How to avoid the derailment (chaining) of the crawler chain of the excavator?
1. When walking on the construction site, please try to place the travel motor behind the walking to reduce the squeezing of the sprocket.
2. The continuous walking time of the machine cannot exceed 2 hours. The walking time on the construction site should be minimized. If necessary, it is recommended to walk after a short stop in the middle.
3. Avoid raised hard objects when walking to avoid stress concentration on the track chain.
4. Confirm the tightness of the crawler, adjust the crawler tighter in soft places such as soil, and adjust the crawler looser when walking on stones. It is not good to have a crawler that is too loose or too tight. Too loose will cause the crawler to derail easily, and too tight will cause the chain sleeve to wear too quickly.
5. Check whether there are foreign objects such as stones in the crawler frequently, and clean them if there are.
6. When working on a muddy construction site, it is necessary to frequently idle to discharge the soil deposited in the crawler.
7. Try to avoid the excavator turning in circles on the spot.
8. Regularly check the rail guard and the rail guard welded under the guide wheel.
What is the reason for abnormal noise from the hydraulic pump?
Abnormal noise may be caused by air entering the system, cavitation, internal component wear or hydraulic oil contamination.
How to troubleshoot the excavator's swing system?
Swing system issues are usually related to the hydraulic motor, swing gears, or control valves. First, check the operation of the hydraulic motor, inspect the gears for wear, and ensure the control valves are working properly. Replace faulty parts as needed.

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