JRR Double acting jack (double acting jack, two-way jack)Detailed product description：

JRR Double acting Jack (Double acting Jack, Bidirectional Jack) Detailed Description:

1、 Purpose:
Double acting jacks (double acting jacks, two-way jacks), especially in large projects, are easy to operate and control hydraulic jacks. They are designed with safety pressure protection devices and built-in pressure relief valves to prevent overload and protect the jacks for safe operation. The connection of this device adopts high-pressure rubber hose and threaded joint connection, which has the advantages of fast use and overcomes the shortcomings of traditional joint oil leakage. It is mainly used for equipment installation, lifting and dismantling operations in various industries such as power, construction, machinery manufacturing, mining, railway bridges, shipbuilding, etc.  

2、 Usage method
1. When the oil level of the pump body is insufficient, it is necessary to add working oil (10 # engine oil) to the pump before it can work.  
2. Estimate the lifting capacity and avoid overloading during use.  
3. Determine the center of gravity of the lifting object, select the point of force for the jack, and consider whether the ground is soft or hard and whether it is cushioned with tough wood to avoid the risk of tipping during lifting.  
4. After the jack lifts the heavy object, it should be supported firmly with tough wood in a timely manner. It is forbidden to use the jack as a support to avoid uneven load and the risk of tipping.  
5. When using, first connect the quick connector of the manual pump to the top, then select the position and tighten the oil drain screw on the oil pump to start working. Loosen the oil drain screw and unload the oil cylinder.  
6. Please refer to the instruction manual for electric pumps.  

3、 JRR double acting jack (double acting jack, two-way jack) basic parameters:

model	Tonnage T (KN)	Travel distance mm	Body height mm	Extension height mm	Outer diameter mm
JRR-1010	10（89）	two hundred and fifty-four	four hundred and nine	six hundred and sixty-three	seventy-three
JRR-1012		three hundred and five	four hundred and fifty-seven	seven hundred and sixty-two	seventy-three
JRR-308	30（267）	two hundred and ten	three hundred and eighty-seven	five hundred and ninety-six	one hundred and two
JRR-3014		three hundred and sixty-eight	five hundred and forty-nine	nine hundred and seventeen	one hundred and two
JRR-506	50（444）	one hundred and fifty-six	three hundred and thirty-one	four hundred and eighty-seven	one hundred and twenty-seven
JRR-5013		three hundred and thirty-four	five hundred and nine	eight hundred and forty-three	one hundred and twenty-seven
JRR-5020		five hundred and eleven	seven hundred and thirty-three	one thousand two hundred and forty-four	one hundred and twenty-seven
JRR-156	75（667）	one hundred and fifty-six	three hundred and forty-seven	five hundred and three	one hundred and forty-six
JRR-7513		three hundred and thirty-four	five hundred and twenty-five	eight hundred and fifty-eight	one hundred and forty-six
JRR-1006	100（889）	one hundred and sixty-eight	three hundred and fifty-seven	five hundred and twenty-five	one hundred and seventy-eight
JRR-10013		three hundred and thirty-four	five hundred and twenty-four	eight hundred and fifty-seven	one hundred and seventy-eight
JRR-10018		four hundred and sixty-one	six hundred and eighty-seven	one thousand one hundred and forty-seven	one hundred and seventy-eight
JRR-1502	150（1333）	fifty-seven	one hundred and ninety-six	two hundred and fifty-three	two hundred and three
JRR-1506		one hundred and fifty-six	three hundred and eighty-five	five hundred and forty-one	two hundred and three
JRR-15013		three hundred and thirty-four	five hundred and eighty-two	nine hundred and fifteen	two hundred and three
JRR-15032		eight hundred and sixteen	one thousand one hundred and sixteen	one thousand nine hundred and thirty-one	two hundred and three
JRR-2006	200（1778）	one hundred and fifty-two	four hundred and thirty	five hundred and eighty-two	two hundred and forty-eight
JRR-20013		three hundred and thirty	six hundred and eight	nine hundred and thirty-eight	two hundred and forty-eight

The parameters in the table may change due to improvements without further notice.  

4、 Precautions
a) If there is a phenomenon of empty tapping during use, you can first loosen the oil drain screw on the pump body, lift the pump body vertically and tap downwards a few times, then tighten the oil drain screw, and continue to use.  
b) When there is a load, do not remove the quick connector to avoid accidents and damage to the components.  
c) This machine uses oil as the medium, and it is necessary to maintain the oil and this equipment properly to avoid clogging or oil leakage, which may affect the effectiveness of use.  
d) A new or long-term hydraulic jack may experience a slight jump in the piston rod when it is first used due to the presence of a large amount of air in the cylinder. The hydraulic jack can be moved back and forth 2-3 times without load to eliminate the air in the chamber. Long term idle hydraulic jacks, due to the hardening of seals caused by long-term inactivity, affect the service life of hydraulic jacks. Therefore, when hydraulic jacks are not in use, they should be moved back and forth with no load 2-3 times a month