Quality Hydraulic Piston Pumps & Rexroth Hydraulic Pump Manufacturer

Better parts company specialize in research and development,production and sales of hydraulic products.We have more than 8 years experience focusing on the overseas Market. Our main products is hydraulic pump,motor,valve,gear box ,gear pump,spare parts,ect.Involved in hydraulic brands:Rexroth,Parker,Eaton-Vickers,Linde,Sauer-Danfoss and so on.We always adhere to the "High Quality,best service,competitive price ”product concept. And we are the investor of many factories, one-stop service has become our shining point. Our factory produces rotary motor, rotary reducer, rotary bearing, rotary gear parts, walking motor, walking reducer, walking gear parts, four wheels and one excavator chassis parts. Welcome new and old customers from all over the world to contact us for future business ..

1 Depressing the clutch pedal is difficult to start An excavator is equipped with a Mitsubishi S6D115 diesel engine. When the clutch pedal is stepped on, it will be difficult to start the diesel engine, and the hot engine will not start. At this time, if you crank the crankshaft by hand, you will feel that the crankshaft is very difficult to rotate. Only when the clutch pedal is released, the above phenomenon will not occur. Check as follows: When the diesel engine is running, depress the clutch pedal to the end, and the clutch will make a continuous beep. When the diesel engine is idling, as long as the clutch pedal is stepped on, the engine will stop immediately, and it is preliminarily judged that the clutch is faulty. Carry out on-vehicle inspection when the diesel engine is stationary. Step on the clutch pedal, the clutch driven disc can rotate freely, and other parts are not damaged or abnormal, but the release bearing cannot rotate. In order to find the cause of the failure, it was decided to dismantle and inspect the clutch. However, when disassembling the transmission, it was accidentally found that the inner, outer ring and cage of the release bearing were severely ablated and locked. Retry the machine after replacing it with a new release bearing, the malfunction disappeared. 2 The diesel engine cannot start after overhaul An excavator is equipped with an Isuzu 6B115 diesel engine. The diesel engine cannot be started after overhaul. Although the diesel engine rotates very fast when it is forced to start, there is still no sign of fire. Check the fuel system and found no pipeline blockage and air leakage. The fuel injection pump pumps oil for each cylinder, and each fuel injection nozzle also sprays well. The cylinder pressure of the diesel engine is normal, and there is no problem with the fuel supply timing. Suspected that the valve clearance was not adjusted properly, and decided to readjust the valve clearance. When adjusting the valve clearance, in order to strive for accuracy, the high-pressure oil pipe was removed and the diesel engine was rotated. When the fuel injection pump high-pressure oil pipe joint of the first cylinder came in, it was found that the first cylinder of the diesel engine was not at the compression top dead center position, while the VI cylinder was in compression Top dead center position. Rotating the diesel engine clockwise, it is found that the fuel injection pump work sequence is chaotic, the sequence is Ⅳ—Ⅱ—Ⅵ—Ⅲ—Ⅴ—I; while rotating the diesel engine counterclockwise, the working sequence is normal Ⅰ—Ⅴ—Ⅲ—Ⅵ—Ⅱ -IV. This situation is exactly the opposite of the working sequence of diesel engines and fuel injection pumps. Disassemble the fuel injection pump and check it carefully, and found that the camshaft of the fuel injection pump was reversed. After the camshaft is installed upside down, the diesel engine will have a special malfunction of disordered work order and unable to start. Retry the machine after reinstalling the camshaft in the correct way and the fault is eliminated. 3 Idle speed jitter after diesel engine overhaul A Mitsubishi S6D110 diesel engine equipped with a certain excavator jittered severely when idling after overhaul. The analysis believes that for a newly overhauled diesel engine, it is most likely that a certain part of the fit clearance is inappropriate during the assembly process. To this end, the diesel engine was disassembled for a comprehensive inspection. Check the clearance between the main journal of the crankshaft and the main bearing, the connecting rod journal and the connecting rod bearing, the piston skirt and the cylinder wall, the piston and the piston ring, and no problems were found. In the process of disassembling the piston and connecting rod, it was found that the clearance between the small end bushing of the connecting rod of cylinder II and the piston pin was too small, only 0.01 mm. After the diesel engine is overhauled, the connecting rod small end bushing and piston pin should be able to rotate flexibly. However, the matching gap between the connecting rod small end bushing and the piston pin of cylinder II is too small, which makes the connecting rod difficult to rotate, resulting in the crankshaft not rotating. Jitter due to balance, especially at idling speed, this phenomenon is more obvious. Trim the small-end bushing of the connecting rod of cylinder II with a scraper, and try to fit the piston pin while trimming until the gap between the two meets the requirements. Then the test engine was assembled and the idling jitter of the diesel engine was eliminated.

How to store construction machinery correctly is the knowledge that construction machinery operators should master. In particular, many construction machinery may not be used for a long time, or after a certain project is completed, these machinery and equipment need to be stored for a long time.   At this time, how to properly store construction machinery for a long time has become an important issue, so how to store and prevent construction machinery for a long time and how to maintain these equipment during storage so that they will not affect future use.   How to store construction machinery correctly: 1. It should be parked in a dry room. Those who have to stop outdoors should choose a flat ground and spread wooden boards. Cover with a drape after parking. 2. Before long-term storage, the machine must be maintained, repaired and damaged, and cleaned up thoroughly to maintain a good technical condition. 3. The arrangement and layout of the parking area should ensure that the entry and exit of any machine is not affected by other machines. 4. The fuel control lever of the machine should be placed in the idle position, and the control levers should be placed in the neutral position. 5. Custody of the engine. ① Drain the cooling water in the engine. ② Change the engine oil. New engine oil is usually neutral and will not corrode the metal parts of the engine. ③Fill the fuel tank with diesel to avoid rusting of the fuel tank. If conditions permit, preservatives should also be added. ④ During the shutdown period, the engine should be started once a month to allow the machine to travel a short distance so that a new oil film is established at the lubrication of each part to prevent rust. It should be noted that the cooling water should be filled before starting, and the cooling water should be drained at the end. 6. Storage of batteries. ① The battery should be removed and placed in a dry and antifreeze place. To keep its surface clean and dry, it is strictly prohibited to place conductive objects on the battery. When removing the battery, first cut off the negative wire and then the positive wire; when installing, connect the positive wire first, and then the negative wire. Because the electrical system of construction machinery is negative ground, this is to prevent short circuit when disassembling the battery. ② Lead-acid batteries should be charged once a month. 7. Anti-rust treatment. ①Before storage, it is necessary to determine whether to repaint or repaint the whole machine according to the size of the peeling area of ​​the outer surface of the anti-rust paint. ② For the working devices of construction machinery, such as the screed of the paver, the bucket of the loader, the scraper of the grader, etc., the anti-rust method for the exposed metal is to apply butter.