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5

MAINTENANCE

Important:

 Use 

ONLY

 good grade hydraulic jack oil. Avoid mixing different types of fluid and 

Never

 use brake fluid, 

turbine oil, transmission fluid, motor oil or glycerin. Improper fluid can cause failure of the jack and the potential for 

sudden and immediate loss of load. We recommend premium jack oil. 

Adding oil

1. With saddle fully lowered set jack in its upright, level position. Locate and remove oil filler plug.

2.

Fill with oil until just below the rim of oil filler hole. Reinstall the oil filler plug.

Changing oil

For best performance, replace the complete fluid supply at least once per year.
1. With saddle fully lowered, remove oil filler plug.

2. Lay the jack on its side and drain the fluid into a  suitable container.

Note: 

Dispose of hydraulic fluid in accordance with local regulations.

3. Fill with oil until just below the rim of oil filler hole. Reinstall the oil filler plug.

Lubrication

1. A periodic coating of light lubricating oil to pivot points will help to prevent rust and assure that pump assemblies

move freely.

2. Air pump should be internally lubricated before each use. Use good quality air tool lubricant. If no inline oiler

is used, pour a teaspoon of air tool oil into the air control valve inlet. Operate the jack with air pressure to fully

distribute the oil inside the air motor.

Cleaning

Periodically check the pump piston and ram for signs of rust or corrosion. Clean as needed and wipe with an oily cloth.

Note: 

Never use sandpaper or abrasive material on these surfaces! 

Storage

When not in use, store the jack with saddle fully lowered.

TROUBLESHOOTING 

Symptom

Possible Causes

Corrective Action

Jack will not lift load

• Release valve not tightly closed

• Load is too heavy

• Ensure release valve tightly closed

• Consider higher capacity jack

Jack will lift, but not maintain 

pressure

Release valve not tightly closed

• Hydraulic unit malfunction

Ensure release valve tightly closed

• Discontinue use, contact Omega

technical service

Jack will not lower after unloading

• Reservoir overfilled

• Linkages binding

• Fluid level low

• Drain fluid to proper level

• Clean and lubricate moving parts

• Ensure proper fluid level

Poor lift performance

• Fluid level low

Air trapped in system

• Ensure proper fluid level

Refer to Bleeding/ Venting

Trapped Air instructions

 Will not lift to full extension

• Fluid level low

• Ensure proper fluid level

Summary of Contents for 28045

Page 1: ...Ton 4 Ton This is the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death WARNING To av...

Page 2: ...se if broken bent cracked or damaged parts are noted Any jack that appears damaged in any way or operates abnormally shall be removed from service immediately If the jack has been or suspected to have...

Page 3: ...position used to lower the saddle 4 With saddle fully lowered and release valve closed pump the operating handle If lift arm responds immediately jack is ready for use If jack does not respond open r...

Page 4: ...alve by turning it clockwise until firm resistance is felt 3 Verify lift point center jack saddle under lift point 4 Squeeze the lift control valve model 28047 only or insert handle into handle sleeve...

Page 5: ...bricated before each use Use good quality air tool lubricant If no inline oiler is used pour a teaspoon of air tool oil into the air control valve inlet Operate the jack with air pressure to fully dis...

Page 6: ...items but are illustrated as a convenient reference of location and position in the assembly sequence When ordering parts please give the Model number part number and parts description Models 28045 2...

Page 7: ...1 A O ring 1 B Back up Washer 1 C Seal 1 D O ring 2 E Back up Washer 2 F U cup 1 G Back up Washer 1 H Seal 1 J Filter 1 K Oil Seal 1 L Packing 1 M O ring 2 N Back up Washer 2 Replacement requires spe...

Page 8: ...NTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED TO ONE YEAR OTHERWISE THE REPAIR REPLACEMENT OR REFUND AS PROVIDED UNDER THIS EXPRESS LIMITED WARRANTY IS THE EXCLUSIVE R...

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