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Hydraulic jack jack goes up but will not lift or stay up even without weight

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Check the piston seals are not damaged.. Check the non return ball has not got something stuck under it .

Posted on Dec 31, 2013


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Posted on Jan 02, 2017

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SOURCE: does the max weight a bottle jack can lift lower

No. Max. capacity is the same all through the stroke of the piston.


Posted on Jan 08, 2011

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It lifted the car weight fine but it would eventually drop back down. what i did was drain the hydrolic oil and replaced for a new one but now it doesnt lift at all.

Sounds like you're having issues with a hydraulic jack. There are a few things that could be causing this issue:

1) The seals in the hydraulic cylinder are beginning to fail, allowing fluid to leak out of the pressurized cylinder and back into the reservoir
2) The valve is failing, leading to a similar issue stated above.

That stated, DO NOT CONTINUE TO USE THE JACK until you have resolved the issue--the high pressure system could fail very violently.

Sep 02, 2015 | Cars & Trucks

1 Answer

My hydraulic lift for my 149 cub cadet will not lift when the snow plow is attached.

Try checking the fluid, it may be low. Or the seals in the cylinders may be leaking and bypassing so you can't build up pressure.

Jan 31, 2015 | Cub Cadet Garden

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My lift goes high without weight on it. when we lift someone it does not go same height.

It sounds to me like you have air trapped in the lift cylinder or line this is caused by in some units by lowering the unit with no weight on it after it was lifted with weight on it. If you put weight on it and run it fully up and then lower it all the way. Check the Hydraulic Fluid running the system low will cause the fluid to get extra hot and will foam witch will put air in the line. I hope this helps

Jan 09, 2015 | Health & Beauty

1 Answer

What is a jack lift?

"A jack lift is a mechanical device used as a lifting device to lift heavy loads or apply great forces. Jacks employ a screw thread or hydraulic cylinder to apply very high linear forces.
A mechanical jack is a device which lifts heavy equipment. The most common form is a car jack, floor jack or garage jack which lifts vehicles so that maintenance can be performed.
More powerful jacks use hydraulic power to provide more lift over greater distances. Mechanical jacks are usually rated for a maximum lifting capacity (for example, 1.5 tons or 3 tons)." (Wikipedia)

Oct 07, 2013 | Hoisting

1 Answer

My Sears 3 ton high lift floor jack will raise but it won't lift any weight. The jack is only 3-4 years old and it has not had much use. I can't find my owners manual, and I want to know what I...

Sounds like it needs some hydraulic fluid added.Look for a rubber plug or screw on the side of the hydroelectric cylinder where the ram comes out.Buy a zoom spout oilier and save the oil.Use some solvent and clean it out.Add some hydraulic fluid and fill until it starts to come out.You may be able to find an oil can that will work for you. Leave the jack in the closed position when you fill it.

If this is not the solution that you are looking for please re post because when we pick a question to answer FixYa takes it out of the questions.

May 19, 2011 | Garden

1 Answer

Where Do I Fill Oil Into My Car Jack?

Usually only oil has to be added if the jack will not pump up, not down. They go down either by added retraction springs or by the weight of what they were lifting.
Anyway, look for a small rubber plug about 1/2" in diameter on the hydraulic unit, lay the unit on it's side so when the rubber plug is removed the oil won't run out. Once you remove the plug, fill it up with hydraulic jack oil from an auto parts store. Put the plug back in, you may have to work the jack to purge air bubbles, by pumping it up and down a few times.

May 05, 2010 | Sander Industrial Original Clarke Floor...

1 Answer

Automotive Jack will not lift if there is any weight on it

I am amusing the jack is hydraulic have you tried turning the screw clock wise on the base of the jack sometimes located were the handle inserts?

Jul 26, 2009 | Home Fencing

1 Answer

Problem removeing brake discs.

Replace Page 1 of 2
u can vist auto zone .com for more info here to help Shaun

Before any service is performed, carefully check the following:
  • Be sure the vehicle is properly centered and secured on stands or a hoist.
  • If the vehicle has antilock brakes, depressurize the system according to the procedures given in the service manual.
  • Disconnect the battery ground cable.
  • Front brake pad replacement begins with removing brake fluid from the master cylinder reservoir. If this is not done, the fluid could overflow and spill when the pistons are forced back into the caliper bore, possibly damaging the painted surfaces.
  • Replace the cover.
  • Discard old brake fluid.

  • Raise the car. Make sure it is safely positioned on the lift.
  • If you don't have a lift, use a jack and jack stands.
  • A handle on the jack is moved up and down to raise part of a vehicle and a valve is turned to release the hydraulic pressure in the jack to lower the part. At the end of the jack is a lifting pad.
  • The pad must be positioned under an area of the vehicle's frame or at one of the manufacturer's recommended lift points.
  • Never place the pad under the floorpan or under steering and suspension components, because they can easily be damaged by the weight of the vehicle.
  • Always position the jack so that the wheels of the vehicle can roll as the vehicle is being raised.
  • Never use a lift or jack to move something heavier than it is designed for. Always check the rating before using a lift or jack. If a jack is rated for 2 tons, do not attempt to use it for a job that requires a 5-ton jack. It is dangerous for you and the vehicle.
  • Safety stands, also called jack stands, are supports of various heights that sit on the floor. They are placed under a sturdy chassis member, such as the frame or axle housing, to support the vehicle.
  • Once the safety stands are in position, the hydraulic pressure in the jack should be slowly released until the weight of the vehicle is on the stands. Like jacks, jack stands also have a capacity rating. Always use the correct rating of jack stand.
  • Never move under a vehicle when it is supported by only a hydraulic jack. Rest the vehicle on the safety stands before moving under the vehicle.
  • The jack should be removed after the jack stands are set in place.
  • This eliminates a hazard, such as a jack handle sticking out into a walkway. A jack handle that is bumped or kicked can cause a tripping accident or cause the vehicle to fall.
  • If you use support stands on asphalt, put a piece of thick plywood or a steel plate under the stands.
  • Remove its wheel assemblies.

  • Inspect the brake assembly.
  • Look for signs of fluid leaks, broken or cracked lines, or a damaged break rotor. If a problem is found, correct it before installing the new brake pads.

  • Loosen the bolts and remove the pad locator pins.
  • During servicing, grease, oil, brake fluid, or any other foreign material must be kept off the brake linings, caliper, surfaces of the disc, and external surfaces of the hub. Handle the brake disc and caliper in such a way as to avoid deformation of the disc and nicking or scratching of the brake linings.

  • Lift and rotate the caliper assembly from the rotor.

  • Remove the brake pads from the caliper assembly.

  • Fasten a piece of wire to the car's frame and support the caliper with the wire.
  • When a hydraulic hose is disconnected, plug it to prevent any foreign material from entering.

  • Check the condition of the locating pin insulators and sleeves.

Art courtesy of Delmar - Thomson Learning.
  • Place a piece of wood over the caliper's piston and install a C-clamp over the wood and caliper.
  • Tighten the clamp to force the piston back into its bore.

Nov 15, 2008 | 1998 Honda Accord

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