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What are the parts of a bottle jack?

 
         
         
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Bottle jack saddle

 
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Most bottle jacks have a serrated saddle that sits underneath the vehicle while it is being lifted. Serrated means it has a jagged edge, like a saw, for extra grip.

 
         
     

Bottle jack extension screw

 
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The extension screw can be extended for extra reach up to its maximum lift height. Turn the extension screw anti-clockwise to raise, and clockwise to lower.

 
         
     

Bottle jack ram

 
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The ram extends when the jack is pumped, pushing the saddle against the underside of the vehicle to lift it.

 
         
     

Bottle jack two piece handle

 
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Bottle jacks usually have a two piece handle that extends from a socket, and can be retracted again for easy storage.

 

The jack handle will either contain a spring clip or a bayonet connector to enable it to slot together.

 
         
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Spring clip

With a spring clip connector, the clip needs to be pushed in to slot the two piece handle together. The spring clip will sit in an opening to lock both parts of the handle.

 
         
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Bayonet connector

The bayonet connector will contain two radial pins on one half of the handle and two L-shaped slots on the other half of the handle. The pins fit into the L-shaped slots locking the two halves of the handle in place.

 
         
     

Bottle jack release valve

 
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When the release valve is partially opened, it allows pressure to be released, causing the oil to run back into the reservoir inside the bottle jack. This enables the jack to be lowered.

 

When the release valve is closed, it is ready to be raised. 

 
         
     

Bottle jack piston assembly (pump piston & cylinder)

 
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The piston assembly consists of a pump piston and a cylinder. When the user lifts the jack handle, it lifts the pump piston drawing oil into the pump cylinder from the reservoir.

 

Pushing the handle down forces the oil into the main cylinder, raising the main piston. 

 
         
     

Bottle jack socket

 
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The handle socket is where the two piece jack handle will be inserted. 

 
         
     

Bottle jack filler plug

 
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This plug can be removed to add hydraulic oil to the jack.