MAC TOOLS JB12 Operating Instructions & Parts Manual page 3

WARNING
!
• Study, understand, and follow all instructions
before operating this device.
• Do not exceed rated capacity.
• Use only on hard, level surface.
• This is a lifting device only. Immediately after
lifting, support the load with appropriate means.
• Lift only on areas of the vehicle as specified by
the vehicle manufacturer.
• No alterations shall be made to this product.
• Only attachments and/or adapters supplied by
the manufacturer shall be used.
• Failure to heed these markings may result in
personal injury and/or property damage.
PREPARATION
Before Use
1. Before using this product, read the operator's manual completely and familiarize yourself thoroughly with the
product, its components and recognize the hazards associated with its use.
2. Verify that the product and application are compatible.
3. Assemble handle, ensure spring clips align with slots.
4. To familiarize yourself with basic operation, use the notched end of provided Pump Handle to engage and turn
the Release Valve:
a. Clockwise until firm resistance is felt to further turning. This is the 'CLOSED' Release Valve position used to
raise the ram plunger.
b. Counter-clockwise, but no more than 1/2 turn from the closed position. This is the 'OPEN' Release Valve
position used to lower the Ram Plunger.
5. With Ram Plunger fully retracted and release valve closed, pump the operating handle. If Ram Plunger responds
immediately, jack is ready for use. If jack does not respond, follow Bleeding/Venting Trapped Air instruction below.
6. Check that the pump operates smoothly and that the Extension Screw will thread up/down easily before putting
into service. Replace worn or damaged parts and assemblies with Mac Tools authorized replacement parts only.
Bleeding/Venting Trapped Air
With the Release Valve in the OPEN position (step 4b above) and with Ram Plunger fully lowered, locate and remove
the Oil Filler Plug/Screw. Insert the Pump Handle into the Handle Sleeve; then pump 6 to 8 full strokes. This will help
release any pressurized air which may be trapped within the reservoir. Oil level should be even with the bottom of
the oil filler hole. Reinstall the Oil Filler Plug/Screw.
WARNING
!
To avoid crushing and related injuries:
• Never work on, under or around a load supported
only by hydraulic jack.
• Always use adequately rated jack stands.
• Chock each unlifted tire in both directions.
• Do not use this device to lift, level, lower, support
nor move a house, mobile home, travel trailer,
camper or any building structure.
• Be alert and sober when using this product.
Do not operate under the influence of drugs or
alcohol.
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