Craftsman 50357 Operator's Manual

5PICTURE 3MAINTENANCEMaintenanceTo Add Oil:• Position jack on the level ground and lowerthe saddle.• Remove the oil fill plug.• Fill the oil reservoir until oil level is just overthe top surface of the inner cylinder. Replaceoil plug.• Perform Air Purge Procedure described onpage 2.To Replace Oil:• Fully open release valve by turning handlecounterclockwise as far as it will go.• Remove the oil fill plug. Turn the jack overso that old oil will drain from the oil fill hole.• Turn the jack back over after the oil hasdrained. Refill through oil fill hole. Keep dirtand other material clear when pouring. Fillto just beneath lower rim of hole. Replace oilfill plug.• Perform Air Purge Procedure described onpage 2.Lubrication:• Add lubricating oil (WD-40) to all movingparts when needed.• For light duty use, lubricate every sixmonths.• For heavy and constant use, lubrication isrecommended every month.Rust Prevention:• Check ram and pump plunger on the PowerUnit Assembly every two months (or sooner,based on usage) for any signs of rust orcorrosion. Lift the jack as high as it goesand look under and behind the lifting arm. Ifsigns of rust are visible clean as needed andwipe down with with an oily cloth or clothsprayed with WD-40.• When storing the jack, always have thesaddle and pump plunger in the downpostion.ALWAYS USE A GOOD GRADEHYDRAULIC JACK OIL. DO NOT USEHYDRAULIC BRAKE FLUID, ALCOHOL,GLYCERINE, DETERGENT, MOTOROIL OR DIRTY OIL. USE OF AN UN-RECOMMENDED FLUID CAN CAUSEDAMAGE TO YOUR JACK.Storage:Depress the spring lock to separate thehandle pieces.Air Purge ProcedureDuring shipment, air may get into thehydraulic system causing reduced liftingperformance. Perform Air Purge Proceduredescribed on page 2.• When the ram reaches maximum extension,oil bypasses the lift cylinder through anoverload valve back into the oil reservoir,protecting the jack from damage. Thisbypass system also goes into effect whenthe jack is overloaded (load exceeds 4,000lbs) to protect the jack from damage and theuser from possible serious injury.• Opening the release valve allows oil toflow back into the reservoir. This releaseshydraulic pressure on the ram, which resultsin lowering the saddle.Release valveOil filler plugOil filler holePump plungerRam all way inCylinderReservoirProper oil lever

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