Preventive Maintenance - MAC TOOLS JSA350LR Owner's Manual

3.5 ton capacity floor jack

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Troubleshooting
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SET UP

1. Remove the 2-piece handle from box. Depress the upper handle lock button and insert the smaller diameter end of the upper handle into the lower handle

end with hole. Make sure the button engages the hole.

2. Grease the inside of the handle yoke so the handle will rotate freely inside the yoke. Remove the handle yoke screw. Insert the end of the lower handle all

the way in the handle yoke until it engages the release valve assembly. Secure the handle in the handle yoke by reinstalling the handle yoke screw and

tightening the screw. Rotate the handle to see if it is rotating the release valve assembly. Pull on the handle to make sure it is secured in the handle yoke.

If the release valve assembly is not rotating and/or the handle pulls out of the handle yoke, repeat step 2.

3. IMPORTANT: In most cases the jack should work normally right out of the box but it is not unusual for air to get trapped in the jack's hydraulic system during

shipping and handling. There are several symptoms of an air trapped hydraulic system which include only partial incremental pump stroke, jack will not

lift load, jack will not sustain load or pumping feels spongy under load. The following procedure will purge air from the hydraulic system and only needs to

be done if experiencing any of the above mentioned conditions.

a) The saddle should be in its lowest position. Remove the four screws that secure the cover plate to the jack frame so the oil filler screw can be

removed from the hydraulic power unit reservoir tube.

b) Look inside the oil fill screw hole. You should be able to see the top of the power unit's cylinder. The hydraulic fluid level should be no higher than

the top of the cylinder. Correct the fluid level if it is not at the proper height. CAUTION: In order to prevent seal damage and jack failure, never use

alcohol, hydraulic brake fluid, or transmission oil in the jack. Use hydraulic jack oil, a light turbine oil, Chevron Hydraulic Oil AW ISO 32 or Unocal

Unax AW 150.

c) Close the release valve by turning the handle clockwise until it stops. Pump the jack against a load of at least 500 pounds (225 Kgs). After the load

is raised to maximum height, slightly turn the handle in a counterclockwise direction so the load is very slowly lowered, while simultaneously and

quickly pumping the handle 5 or 6 full incremental pump strokes. After pumping, lower the lift arm to its full rest position.

d) Install the oil fill screw. Rotate the handle in a clockwise direction until tight and pump the lift arm to maximum height without a load. Repeat steps

a) through d) until all the air has been purged from the system. Reinstall the cover plate.

IMPORTANT: Before attempting to raise any vehicle, check vehicle service manual for recommended lifting surfaces.

OPERATING INSTRUCTIONS

This is the safety alert symbol used for the OPERATING INSTRUCTIONS section of this manual to alert you to potential personal injury hazards.

Obey all instructions to avoid possible injury or death. IMPORTANT: Before attempting to raise any vehicle, check vehicle service manual for

recommended lifting surfaces.

OPERATION

1. Put vehicle transmission in park or in gear and then apply the emergency brake.

To raise load: Turn the handle in a clockwise direction until tight. Position the jack under the load. Proceed to pump the handle in order to raise the lift

arm to the load. As the saddle at the end of the lift arm gets closer to the load, reposition the jack so the saddle will contact the load firmly and the load is

centered on the saddle. Make sure the saddle is correctly positioned. Raise the load to the desired work height. Place jack stands of appropriate capacity

at the vehicle manufacturers's recommended support areas that provide stable support for the raised vehicle. DO NOT CRAWL UNDER VEHICLE WHILE

LIFTING VEHICLE OR PLACING OR REMOVING THE JACK STANDS! Once jack stands are positioned, turn the jack handle VERY SLOWLY in a counterclockwise

direction to lower the load to rest on the jack stands. Inspect the relationship between the jack stands and load to make sure the setup is stable and safe.

If the setup is not stable or safe, follow the preceding steps until corrected.

2. To lower load: Follow the procedures mentioned in "To raise load" section of the OPERATING INSTRUCTIONS in order to raise the load off the jack stands.

Once the load has cleared the jack stands, remove the jack stands from under the load and away from the work area. Turn handle very slowly in a counter

clockwise direction until the load is completely lowered to the ground. Once the jack's lifting saddle has cleared the load, remove the jack from under the

load. CAUTION: Keep hands and feet away from the hinge mechanism of the jack. DO NOT CRAWL UNDER VEHICLE WHILE LIFTING VEHICLE OR PLACING

OR REMOVING THE JACK STANDS!