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Remove keys or wrenches before connecting the tool to an air supply, power supply, or turning on 
the tool. A wrench or key that is left attached to a rotating part of the tool may cause personal 
injury. 

 

CAUTION

 

TRAILER JACK USE AND CARE 

 

Do not force the trailer jack. Products are safer and do a better job when used in the manner for 
which they are designed. Plan your work, and use the correct product for the job. 

 

Check for damaged parts before each use. Carefully check that the trailer jack will operate 
properly and perform its intended function. Replace damaged or worn parts immediately. Never 
operate the trailer jack with a damaged part. 

 

Do not use a trailer jack with a malfunctioning switch. Any power tool that cannot be controlled 
with the power switch is dangerous and must be repaired by an authorized service representative 
before using. 

 

Disconnect the power/air supply from the trailer jack and place the switch in the locked or off 
position before making any adjustments, changing accessories, or storing the tool. Such 
preventive safety measures reduce the risk of starting the tool accidentally. 

 

Store the trailer jack when it is not in use. Store it in a dry, secure place out of the reach of 
children. Inspect the tool for good working condition prior to storage and before re-use. 

 

Use only accessories that are recommended by the manufacturer for use with your product. 
Accessories that may be suitable for one product may create a risk of injury when used with 
another tool. Never use an accessory that has a lower operating speed or operating pressure than 
the tool itself.

 

Specific Operation Warnings 

WARNING

 

 

To prevent injury or property damage, read and understand owner's manual before operating. 

 

Do not exceed the rated load capacity.  

 

The trailer jack is designed for vertical loading. Excessive side forces may cause jack failure. 

 

Do not use crank while power lift is in use. 

 

Wear ANSI Z87.1 compliant safety goggles during use. 

 

For use on flat, level, hard surface capable of supporting load.  

 

Prevent trailer wheels from moving using wheel chocks while raising or lowering. 

 

Before towing, fully raise trailer jack and secure properly. 

 

Keep body parts clear from under jack and tongue when applying and releasing load, or moving 
trailer. 

 

Do not use blocks for additional ground clearance.  

 

To avoid accidental shock and/or damage to the electrical system, disconnect the battery ground 

Summary of Contents for 57405

Page 1: ...lectric Trailer Jack Owner s Manual WARNING Read carefully and understand all ASSEMBLY AND OPERATION INSTRUCTIONS before operating Failure to follow the safety rules and other basic safety precautions may result in serious personal injury Item 57405 ...

Page 2: ...t that you read the entire manual to become familiar with this product before you begin using it This trailer jack is designed for certain applications only Northern Tool and Equipment is not responsible for issues arising from modification or improper use of this product such as an application for which it was not designed We strongly recommend that this product not be modified and or used for an...

Page 3: ...tions 4 Important Safety Information 4 Specific Operation Warnings 6 Main Parts of Trailer Jack 7 Assembly Instructions 7 Before Each Use 8 Operating Instructions 8 After Each Use 9 Maintenance 10 Troubleshooting 10 Parts Diagram 12 Parts List 13 Replacement Parts 13 Limited Warranty 14 ...

Page 4: ...ication Type 12V DC A Frame Lift Capacity lb 5 000 Support Capacity lb 7 500 Clearance Bracket to Jack Top in 24 Length of Travel in 18 Length Retracted in 9 Measured from ground to center of mounting point Length Extended in 31 1 2 Measured from ground to center of mounting point Drop Leg Travel in 4 1 2 Jack Tube Size in 2 1 4 Crank Type Includes manual crank handle Ground Support Foot pad Mount...

Page 5: ...ly close to cutting tools and rotating parts Do not use the jack where there is a risk of causing a fire or an explosion e g in the presence of flammable liquids gases or dust The jack can create sparks which may ignite the flammable liquids gases or dust Do not allow the jack to come into contact with an electrical source The tool is not insulated and contact will cause electrical shock Keep chil...

Page 6: ... tool accidentally Store the trailer jack when it is not in use Store it in a dry secure place out of the reach of children Inspect the tool for good working condition prior to storage and before re use Use only accessories that are recommended by the manufacturer for use with your product Accessories that may be suitable for one product may create a risk of injury when used with another tool Neve...

Page 7: ...e jack If the trailer jack has a drop leg never attempt to adjust the drop leg when there is any load on the jack Main Parts of Trailer Jack Reference Subassembly 1 Hand Crank Handle 2 Light Switch 3 Extend Retract Motor Switch 4 Connector Storage Bracket 5 3 Graded 5 1 in long 3 8in 16 UNC Bolts 6 3 3 8in Flat Washers 7 3 Lock Washers 8 7 Way Connector 9 Drop Leg Assembly Instructions WARNING ...

Page 8: ...tion Secure the jack using three 3 3 8 diameter 1 long grade 5 bolts and lock washers Bolts should be tightened to 15 20 ft lb Route the black wire lead from the plastic cover along the trailer to the battery Attach the wire lead to the trailer using cable ties or equivalent Connect the wire lead from the jack directly to the positive terminal of the battery This unit has a built in circuit breake...

Page 9: ...sing the motor to switch off In this case release the operating switch and wait 15 seconds for the breaker to reset before resuming operation Retract the jack by pushing the operating switch DOWN The jack will stop automatically at the end of the extension or retraction stroke If you attempt to extend or retract the jack and it does not respond it may be at the end of the stroke If the jack fails ...

Page 10: ...ion manual for additional information about engine maintenance The following chart is based on a normal operation schedule Maintenance Interval Maintenance Point Daily before operating The powered A frame jack motor is sealed and maintenance free Before each use inspect jack tubes and replace if bent or damaged Ensure all connections are tight and free of corrosion and that the jack is properly gr...

Page 11: ...pler and ensure paint has been removed by the star washers Direct metal to metal contact must exist between mounting components to ensure good electrical contact Internal circuit breaker has opened Wait 15 seconds for breaker to close Manual reset circuit breaker has opened Reset the breaker by pressing the button on the breaker Loose wires on ON OFF switch Secure wire connections ON OFF switch is...

Page 12: ...Page 12 of 15 Parts Diagram ...

Page 13: ... pad 1 24 Lock Washers 3 25 Mounting Plate 1 26 3 8 16UNC 2B Lock Nut 3 27 Hand Crank Handle 1 Replacement Parts For replacement parts and technical questions please call Customer Service at 1 800 222 5381 Not all product components are available for replacement The illustrations provided are a convenient reference to the location and position of parts in the assembly sequence When ordering parts ...

Page 14: ...y claim contact Us at 1 800 222 5381 identify the product by make and model number and follow the claim instructions that will be provided The product and the purchase receipt must be provided to Us in order to process Your warranty claim Any returned product that is replaced or refunded by Us becomes our property You will be responsible for return shipping costs or costs related to Your return vi...

Page 15: ...Page 15 of 15 Distributed by Northern Tool Equipment Company Inc Burnsville Minnesota 55306 www northerntool com Made in China ...

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