Double acting hollow ram hydraulic jack
The double acting hollow hydraulic jack is a double-acting design, hydraulic reset, the design of the hollow plunger can be used for pulling force, but also for thrust. The advantages of the hollow hydraulic jack are: equipped with a safety valve to prevent damage caused by overpressure, and the painted surface makes the corrosion resistance better strong, all models include quick connectors and dust caps, equipped with dust rings to reduce pollution and extend the life of the jack. Purpose and scope of use: The tension jack is a product developed based on foreign advanced technology and the actual situation in China. It is equipped with the ultra-high pressure electric oil pump station produced by the company to complete the tension function of the tension jack (also can be used for jacking only) ), easy to operate, easy to maintain. Hollow ram hydraulic jack is mainly suitable for the construction of various prestressed concrete structures, widely used in roads, railways, power stations, bridge construction, rock and soil anchoring, landslide treatment, overall lifting of large heavy objects, continuous pushing of super-heavy parts, disassembly of interference fit machines, etc. 
Long-term use of the hollow hydraulic jack requires daily maintenance, otherwise it will shorten the life of the jack. Let's take a look at how to maintain the hollow jack:
1. The newly purchased hollow hydraulic jack has not been used before, so there will be a lot of air in the cylinder. If it is used at the beginning, it is normal for the piston rod to have a slight sudden jump, and the hollow ram hydraulic jack can be reciprocated without load. Exercise a few times and remove the air in the cavity. This is the point of attention for the maintenance of the newly purchased hollow hydraulic jack. If it is not maintained according to this method, there may be many failures in the later use process, such as seal aging and other problems. 
2. After talking about the newly purchased hollow hydraulic jack, let’s take a look at how to maintain the used jack. If the double acting hollow hydraulic jack is used, it will not be used temporarily. If it is to be stored, we must remember to take out the jack every month and let it reciprocate without load. Several times, this can prevent too much air from entering the cavity of the hollow jack and aging the seal. In fact, for hollow jacks, the place where failures are likely to occur is the seal. Once the seal is damaged, the service life and use effect of the hollow jack will be greatly reduced.
3. Hollow hydraulic jack is a widely used hydraulic tool. No matter what environment the jack is used in, it must be moisture-proof and rust-proof. When using the hollow jack in daily use, know its lifting weight range, which is also an important precaution for daily maintenance of the jack.