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Maintenance - Craftsman 50102 Operator's Manual

2 ton aluminum / steel service jack

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How it works
With Release Valve Closed
• An upward stroke of the jack Handle draws oil
from the reservoir tank into the plunger cavity.
Hydraulic pressure holds the valve closed,
which keeps the oil in the plunger cavity.
• A downward stroke of the jack Handle
releases oil into the lift cylinder, which forces
the power unit ram out. This raises the saddle.
• When the ram reaches maximum extension,
oil bypasses the lift cylinder through an
overload valve back into the oil reservoir,
protecting the jack from damage. This bypass
system also goes into effect when the jack is
overloaded (load exceeds 4,000 lbs) to protect
the jack from damage and the user from
possible serious injury.
• Opening the release valve allows oil to flow
back into the reservoir. This releases hydraulic
pressure on the ram, which results in lowering
the saddle.

MAINTENANCE

To Add Oil:
• Position jack on the level ground and lower the
saddle.
• Remove the oil plug.
• Fill the oil case until oil level is just beneath
the lower rim of oil fill hole. Replace oil plug.
• Perform the Air Purge Procedure detailed on
page 1 of this Operator's Manual.
To Replace Oil:
• Fully open release valve by turning handle
counterclockwise as far as it will go.
• Turn the jack over so that old oil will drain from
the oil fill hole.
• Refill through oil fill hole. Keep dirt and other
material clear when pouring. Fill to just
beneath lower rim of hole. Replace oil plug.
• Perform Air Purge Procedure detailed on page
1 of this Operatior's Manual.
Lubrication
• Add lubricating oil (WD-40) to all moving parts
when needed.
• For light duty use, lubricate every six months.
• For heavy and constant use, lubrication is
recommended every month.
Rust Prevention:
• Check ram and pump plunger on the Power
Unit Assembly every two months (or sooner,
based on usage) for any signs of rust or
corrosion. Lift the jack as high as it goes and
look under and behind the lifting arm. If signs
of rust are visible clean as needed and wipe
down with an oily cloth or WD-40.
• When storing the jack, always have the saddle
and pump plunger in the down postion.
ALWAYS USE A GOOD GRADE HYDRAULIC
JACK OIL. DO NOT USE HYDRAULIC
BRAKE FLUID, ALCOHOL, GLYCERINE,
DETERGENT, MOTOR OIL OR DIRTY OIL.
USE OF AN UN-RECOMMENDED FLUID CAN
CAUSE DAMAGE TO YOUR JACK.
Air Purge Procedure:
During shipment or after oil refill, air may get
into the hydraulic system causing reduced
lifting performance. Perform Air Purge
Procedure as detailed on page 1 of this
Operator's Manual.

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