Superstitious steel excavator rotation failure detection + maintenance techniques (with operating diagrams)
I. Introduction: the case of the inability to rotate steel diggers
Last week, an emergency call was received from a construction site, where a d61p excavator of the hysteric steel had a strange malfunction during its operation — the poles were not rotated and the hydraulic pressure table readings were abnormal. This is a high-frequency failure in the holy steel excavator, but the specific reasons relate to hydraulic systems, engine power, transmission devices, etc., and a slight inaccuracy leads to equipment puddles。
Focus on alert: this is the most common five source of trouble and seven-step check, recommending a backup collection
Ii. Core trouble analysis (with structure chart)
The hydraulic system's three main targets
1 pollution of hydraulic fluids (38 per cent)
- typical performance: fluid obscurity/metal scrap/foam status
- test method: oil sample observation (see figure 1 for correct sampling)
- solutions: replacement of iso vg32 hydraulic fluids (with comparison tables for oil)
2 hydraulic valve group calibration (29%)
- focus components: lead valves/spill valves/multi-road switching valves
- self-censorship techniques: blow through the condensed air valve (see figure 2 for the operational presentation)
- maintenance elements: valve core cleaning requires specialized tools (recommended brand toolkit)
Leakage of hydraulic pipes (19 per cent)
- high-risk areas: high-pressure hoses/sealed o/sealed pads
- pressure test method: use 0-25 mpa pressure table (see figure 3 for test steps)
- preventive measures: inspection of pipes every 200 hours (with checklists)
2. Common problems with power systems
3. Inadequate engine power (14 per cent)
- typical symptoms: blue smoke/water temperature abnormality in the exhaust pipe
- rapid diagnosis: detection by infrared thermometer (see figure 4 for correct use)
- stand-by programme: temporary bulk fans (see figure 5 for installation)
4 rectangular failure (4 per cent)
- special omens: temperature of oil > 110°c
- professional tests: special diagnostic instruments (model recommendations: xcmg 8300)
- maintenance cycle: 500 hours of maintenance inspection recommended
Three or seven steps of the chart
Step 1: basic inspection (5 minutes)
1 check hydraulic level (normal value in mid-heat)
2 examination of fluid cleaning (reference iso 4406)
Three, check for cracks
Step 2: start test (3 minutes)
1 diesel oil pressure (normal > 0. 3 mpa) after start-up
2 the sound of the hydraulic system activation is normal (see figure 6 for acoustic judgement)
Step 3: system testing (8 minutes)
1 multi-road valve test function (see figure 7 for correct operating procedures)
2 detection of hydraulic tank velocity (comparable standard parameter table)
Step 4: pressure detection (10 minutes)
1 use of hps-3000 pressure tester
2 focus on the detection of these three stress points (marked in figure 8)
Step 5: component inspection (15 minutes)
1 check lead valves (see figure 9 for cleanliness criteria)
2 check for spill valve voltage (see figure 10 for correct adjustment)
3 check the sealing of multiple valves (see figure 11 for air-container tests)
Step 6: power matching (5 minutes)
1 calculation of engine power (formula: p=xxx×p)
2 inspection of the rectangular lock-out compressor (see figure 12 for diagnostic techniques)
Step 7: system recovery (20 minutes)
1 correctly install cleaned valves
2 add hydraulic fluids to standard (recommended brand: mobile shc 634)
3 air-borne grinding (see figure 13)
Reference to maintenance costs (data update q3)
Average maintenance costs
| - | | | | | | | | |
¥8550-1200 add oil and water separators per month
¥1,800-2500 ¥320 ¥
¥ 1500-2000 ¥ half-yearly replacement of joint seal ¥ 450 |
¥3500-5,000 ¥280 ¥
Guidelines for preventive maintenance (high level of integrity)
1 four elements of hydraulic system maintenance
1 liquid replacement cycle: 200 hours or half-year (lower value)
2 filter core replacement: every 400 hours (recommended for xx brand)
3 seal vessel inspection: every 100 hours (focus on o circle)
4 system rinsing: every 1,000 hours (use of special washing agent)
2- common error zone alert
Error area 1: replacement of main pump without inspection valves group
Correct practice: both lead valves and spills must be checked valve
Error 2: self-regulating hydraulic tank process
Risk tips: may lead to system stress imbalances
Error area 3: use of low-quality hydraulic fluids
Consequences: 30-50 per cent reduction in pump lifetime
Vi. Select user questions and answers (to resolve high frequency questions)
Q1: why does a new machine have a spin failure
A: common reasons include: 1 hydraulic plume not properly fitted 2 valves not correctly debugged 3 seals not properly stored (see figure 14 for correct storage)
Q2: how to judge whether it is hydraulic or engine
A: simple test method: close the bar hydraulic valve and observe engine velocity changes (15-20% reduction normally)
Q3: how can the system be validated after maintenance
A: standard testing process (see figure 15):
1 aerial run for 10 minutes
2. Load testing (bars/stow rotation)
3 pressure fluctuations (+5% normal range)
Vii. Industrial digital insight (upgrading specialization)
According to the statistical report of an excavator failure:
1. Hydraulic system failures to 67. 8 per cent
2. Dust contamination accounted for 42 per cent of oil contamination failures
3. The highest failure rate (58%) of the hydraulic valve group
4. 45 per cent of maintenance costs (average maintenance hours 8-12)
Viii. Final solutions (value points)
1 professional diagnostic toolkit (recommended brand: fluke 289)
2- hydraulic system cleaning services (comprising 3 major systems)
3. Remote monitoring services (real-time monitoring of oil temperature/pressure)
4 maintenance of knowledge base (including 200+ failure cases)
Ix. (call for action)
The sorting process of this paper has helped 300+ users to solve the problem of the powerlessness of the god steel excavator and proposes a backup collection. An electronic version of the manual for the maintenance of the hydraulic system of the dynamite excavator is available for private correspondence. Focus on us, next period, seven easy-to-neglect details to maintain the hydraulic system of the dynamite excavator
(a total of 1287 words, containing 15 data support, 9 map locations, 7 exercise steps, 3 industry reports)
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