Packaged Ratchet Straps differ from other ratchet straps by their packing method.
Usually by 1 pack,2packs,4 packs,6 packs and even 8 packs.
The plastic board for it are specially made thus these tie down strap are easy to carry and keep them in order.
Plus,these packaged ratchet straps are more tend to be hanged on the shelfs of supermarkets and online-shopping sites.
That's not the whole story,we usually make distinguished labels and signs for the packing so as to promote your brand,whereever people carry your straps,they know these are yours.
Consult us for more!
Packaged Ratchet Straps,Ratchet Tie Down Straps,Cargo Tie Down Straps,Rubber Tie Down Straps,Tie Down Strap WINNERLIFTING SAFETY EQUIPMENT CO.,LTD. , https://www.winnerlifting.com
The primary control valve was removed and sent out for external repairs. Following the repair, it was reinstalled, and attempts were made to lift the machine's boom. However, the coordination between components was inconsistent, making leveling operations challenging. Despite replacing the hydraulic pump, handle assembly, and the main arm cylinder seal, the issue persisted. Various hydraulic technicians were brought in by the user to resolve the problem, but none succeeded. This malfunction had lasted for over three months, leaving the equipment in an impaired state.
Effective Maintenance Approach:
1. It’s advisable to reach out to professional distributors who specialize in this machinery. During my on-site testing, I observed that the large arm operated slowly on its own. Performance tests revealed that the lifting time for the large arm was 4 seconds and 85 milliseconds. Interestingly, the forearm and bucket performed well under similar conditions. However, when both arms were used together, the forearm moved faster than usual, while the large arm moved extremely slowly, barely functioning. Only once the forearm began moving did the large arm start to lift.
Based on these observations, the issue seemed to stem from improper integration of the two arms during combined movement, rather than an individual arm malfunction.
2. During overflow testing of the boom lift action, Pump 2 registered a pressure of 30MPA, whereas Pump 1 showed only 4MPA. The test results confirmed that there was no convergence between Pump 1 and Pump 2 during the boom lift.
3. Upon examining the logic valves responsible for the joint operation of the main arm, it became apparent that the oil pipe PB was incorrectly connected to the adjacent DR5 oil pipe. Even after rectifying this connection error, there was still no convergence between the pumps when lifting the upper arm (pressure remained at 4MPA). Further investigation using a hydraulic gauge at the logic valve PB oil port indicated zero pressure when the upper arm was lifted.
4. Analyzing the drawings, it appeared that the logic valve PB oil port lacked pressure when the upper arm was lifted. This suggested a fault involving the pilot selection valve or the upper arm merging and cutting solenoid valve. Inspection of the pilot selection valve revealed that the upper arm merging and cutting solenoid valve was stuck in the closed position (typically it should remain open).
5. After cleaning and grinding the solenoid valve, it resumed normal function. However, subsequent measurements at the logic valve oil port still showed zero pressure when the upper arm was lifted. Noticing a peculiar behavior, I observed that when the upper arm was lowered, the pressure at the PB oil port was actually 4MPA. This led me to suspect incorrect oil pipe connections.
6. Upon meticulous examination of the oil lines, I discovered an improperly installed high-arm oil line at the shuttle valve block. Correcting this installation normalized the pressure at the logic valve PB oil port.
7. Further pressure measurements of the pump during the upper arm lift showed normal lifting speed, but the composite action still exhibited sluggishness. This suggested that the forearm merging might not have been properly disconnected during the upper arm lift. Connecting a pressure gauge to the forearm 2PX port from the forearm merging valve 2PX port measured zero pressure when the upper arm was lifted. Upon checking the lines, it was discovered that the forearm merging valve hose 2PX was incorrectly connected to the main control valve oil port DR1.
After thorough inspection, it became evident that the malfunction was due to a repairman incorrectly reconnecting several hydraulic lines while servicing the main arm merging solenoid valve.
It is recommended to engage professional distributor service engineers who are familiar with this machinery. Post rectification by the technician, the upper arm lifting time during performance tests dropped to 2.8 seconds. The functionality of the upper arm returned to normal, and the fault was fully resolved.
Conclusion: Engaging professional distributor outsourcing engineers is highly recommended. Additionally, always remember to avoid overconfidence and ensure proper labeling when replacing, dismantling, or repairing the main control valve oil lines. Incorrect installations can lead to complex failures and unnecessary financial losses, which can be entirely prevented!