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MODEL 66300B
3 TON LOW PROFILE
FLOOR JACK
USER'S MANUAL
*This hydraulic jack conforms to all "ANSI / ASME" safety standards.
Jackco Transnational Inc. © 2010
South El Monte, CA
888-452-2526
To see more jackco products please visit our website at www.jackco.com
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FOR YOUR SAFETY
• Read these safety instructions carefully and keep this manual in an easy to nd place as you may need to
use it again.
• Non-compliance with these rules may result in injury or damage to the jack or the vehicle.
• Do not modify the jack in any way.
• Never exceed the rated capacity of the jack.
• This jack is a lifting device only and should never be used to move the vehicle.
• The jack should be supported on a solid and level ground. Never use the jack in a surface where it may
sink into the ground.
• Ensure that there are no persons inside the vehicle to be lifted. Switch off the engine and apply the brake.
• Position the jack under the manufacturer’s recommended lifting point for the vehicle. Off-centered loads
can slip and accidents may result.
• During raising and lowering of the load, precautions should be taken to avoid movement of the vehicle.
Trafc may cause the raised vehicle to rock during roadside use of the jack.
• Never work under a raised vehicle without supporting it with mechanical/jack stands.
• Never position any part of your body near the movable parts of the jack.
• Ensure that there are no persons or obstructions underneath the vehicle prior to lowering.
• Do not adjust the overload bypass valve under any circumstance.
Use wheel chocks appropriately
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SPECIFICATION
Capacity: 3 ton Saddle Diameter : 4.7 in
Min Height : 4.3 in Strokes to Max Height: 8
Max Height : 20.25 in Net Weight : 105.6 lbs
Dimension: 29.75 in (L) x 14.2 in (W)
PRIOR TO OPERATION
Air may become trapped in the hydraulic system during transit.
To Purge Air
1.Insert the handle into the socket and secure it with the set screw provided.
2.Turn the handle counterclockwise until release valve is open, pump the jack several times to purge the
accumulated air in the system.
3.Turn the handle clockwise to close the release valve. The jack is now ready to use.
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ASSEMBLY
Please refer to the exploded view drawing in this manual in order to identify parts:
1. Assemble the two handle halves together by depressing the spring-loaded button on the knurled handle
section (#7) and inserting the upper handle section into the lower section (#8). The spring-loaded button
should engage with the hole in the lower handle section.
2. Grease the inside of the handle yoke (#11) and remove the handle set screw (#10).
3. Install the handle assembly in the handle yoke until the bottom of the handle engages with the universal
joint assembly (#13).
4. Reinstall the handle set screw in the handle yoke making sure the screw secures the handle to the
handle yoke. Tighten the screw.
5. Air may become trapped in the hydraulic system during shipping and handling. Trapped air will affect the
pumping performance of the jack. If this occurs, follow the air pumping procedure below:
a) Remove the four screws that secure the cover plate (A) to the jack frame (B) so the oil ller screw (#37)
can be removed from the hydraulic power unit reservoir tube (#38).
b) With the lift arm (C) in its down position, look inside the oil ll screw hole. You should be able to see
the top of the power unit's cylinder (#35). The hydraulic uid level should be no higher than the top of
the cylinder. Correct the uid level if it is not at the proper height.
c) Pump the jack against a load that is at least 500 lbs. (225 Kgs).
After the load is raised, slightly turn the lift handle in a counterclockwise rotation so the load is very
slowly lowered.
While the lift arm is lowering, quickly pump the lift handle 5 or 6 full incremental pump strokes. After
pumping, lower the lift arm to its full rest position.
d) Install the oil ll screw (#37). Rotate the handle in a clockwise rotation until tight and pump the lift arm
to maximum height.
If the pumping condition has improved, repeat steps "a" through "d" until all of the air has been purged from
the system.
e) Install the cover plate (A) with the four screws.
OPERATING INSTRUCTION
To Lift a Vehicle:
Turn the handle clockwise.
Move the handle up and down. Use the full stroke of the piston for
greater speed.
Support the vehicle with appropriate jack stands.
To Lower a vehicle:
Lift the vehicle to remove the jack stands, ensuring that there are
no persons or obstructions under the vehicle. Turn the handle
counter-clockwise.
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MAINTENANCE
Important: Both the maintenance and repair of the jack may only be performed by
qualied persons, who have sufcient knowledge of the hydraulic system used in these
jacks
Regularly lubricate the moving parts in the wheels, arms, handle
and pump roller pin.
• Only original replacement parts should be used.
Extremely Important: never use brake uid.
• When the jack is not in use, make sure the lifting arm is fully retracted to avoid
corrosion.
• Keep the jack in a clean, dry place and out of children’s reach.
• Replace the hydraulic fluid in the reservoir at least once a year. To check the
hydraulic uid level, lower the lifting arm completely.
• The hydraulic uid level should be just below the ller plug. Replenish if necessary,
and reinstall the rubber filler plug. Excessive hydraulic oil may render the jack
inoperative.
• Inspect the jack before each use. Take corrective action or remove the jack from
service if any of the following problems are found:
a. Cracked or damaged frame d. Loose hardware
b. Leaking hydraulic uid e. Modied equipment
c. Scored, damaged piston rod
• Keep warning labels and instructional decals clean and readable. You may use a
mild soap solution to wash external surfaces of the jack.
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TROUBLESHOOTING
Caution: To prevent personal injury, all inspection, maintenance, and repair
procedures must be performed when the jack is free of load.
Trouble Solution
1. The release valve is not closed. Turn the
valve clockwise tightly. If this does not
work, remove handle, lubricate handle
receptacle and handle end, then retry.
2.Low on hydraulic uid. Follow Step 5 of
Jack will not lift load or leaks down
excessively
the "ASSEMBLY" procedure on page 3.
3.Pump seals or back-up ring may be
defective. Clean hydraulic uid passages,
replace seals and rell hydraulic uid.
(Must be serviced by qualied service
center
1.Low on hydraulic uid. Follow Step 5 of
the "ASSEMBLY" procedure on page 3.
Jack will not lift to its full height
Jack will not lower completely
Jack will not lift smoothly or jack
feels spongy
Jack will not hold load or handle
rises
2.The hydraulic system has trapped air.
Follow Step 5 of the "ASSEMBLY"
procedure on page 3.
Return spring is broken or linkages are
binding. Replace spring if broken. Grease
pivot shaft and all lift arm linkages.
The hydraulic system has trapped air.
Follow Step 5 of the "ASSEMBLY"
procedure on page 3.
Discharge ball is not sealing hydraulic
system and oil may be dirty. Manually ush
hydraulic system. Open the release valve,
as required, to raise and lower the lift arm.
Manually raise and lower lift arm.
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PARTS LIST
Part No. Description Q'ty Part No. Description Q'ty
1 Retaining Ring 2 11 Handle Yoke 1
2 Washer 2 12 Power Unit Ass'y. 1
3 Front Wheel 2 13 Universal Joint Ass'y. 1
4 Rear Caster Ass'y. 2 14
5 Hex Nut & Lock Washer 2 15 Grease Fitting 1
6 Yoke Retaining Bolt & Washer 2 16 Retaining Ring 2
7 Handle Lever "B" 1 17 Saddle 1
8 Handle Lever "A " 1 18 Saddle Screw 1
9 Handle Bumper 1 19 Rubber Saddle Pad 1
10 Set Screw - Handle 1 20 Spring 2
Block Linkage (incl. Split Pin, Ret. Rings)
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Model 66300B Power Unit
Index
No.
Description Q'ty
1 Ram
2 Retaining Ring 30
3 Ram Bearing
4 Gasket
5 O-Ring 31 x 4.6
6 Cylinder Nut
7 O-Ring 29.6 x 3.5
8 Gasket
9 Steel ball 4
10 Relief Valve Spring
11 Relief Valve Bolt
12 Sealed Washer
13 Small Pump Housing
14
Pump Spring
15 Dust Cover
16 Retaining Ring 15
17 Small Pump Piston
18 Universal Joint Assembly
19 O-Ring 10 x 2.65
Index
No.
1
20 Back-Up Washer 15 x 10.6 x 1.25
1
21 Washer
1
22 Dust Cover
1
23 Pump Spring
1
24 O-Ring
1
25 Steel Ball 6
1
26 Steel Ball 5
1
27 Retaining Ring 20
1
28 Large Pump Piston
2
29 O-Ring 15 x 2.65
2
30 Back-Up Washer 20 x 15.6 x 1.25
2
31 Washer
1
32 Large Pump Housing
1
33 Hydraulic Block
1
34 Cylinder Seal
1
35 Cylinder
1
36 Gasket
1
37 Oil Fill Screw
2
38 Reservoir Tube
Description Q'ty
2
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
*Index numbers are for your reference only, not all parts are available separately.
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LIMITED ONE YEAR WARRANTY
Jackco Transnational Inc. warrants all Jackco equipment and tools to the original purchaser against any manufacturing defect in material or
workmanship for a period of one (1) year from the original date of purchase. If the defective equipment or tool is determined to be covered under
this warranty, it shall be repaired or replaced at manufacturer's discretion without charge, provided that the equipment or tool must be returned
with proof of purchase to the dealer and freight prepaid, if returned to the manufacturer. This warranty shall not apply to damage due to accident,
negligent use, and lack of maintenance, abuse or applications other than the specic function the equipment or tool is designed for.
No other warranties, expressed or implied, including those of merchantability or tness for particular purpose shall be applicable to Jackco
except as specifically stated herein. In no event shall Jackco be liable to any party for any special, direct, indirect, consequential, punitive
damage of any nature caused by the sale or use of the equipment or tool.
Note: This warranty gives the original purchaser specic legal rights which may very from state to state.
Jackco Transnational Inc. © 2010
South El Monte, CA
888-452-2526 www.jackco.com
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