Harbor Freight Tools 94780 User Manual

10000LBS 2-POST LIFT

Model 94780

INSTALLATION, OPERATION

& MAINTENANCE MANUAL

IMPORTANT: READ THIS MANUAL COMPLETELY BEFORE

INSTALLING or OPERATING LIFT

GENERAL SPECIFICATIONS

See Figure 1

A Rise Height (Screw Pads Highest Position)
B Column Height
C Overall Width
D Drive-thru Clearance
E Floor to Overhead Switch
F Short Arm Reach
G Long Arm Reach
H Screw Pad Height
K Inside of Columns

* Maximum Capacity
Ceiling Height Required
Motor

* Lift capacity ratings are based on loads equally distributed on all four arms.
** Lifting and lowering speeds may vary depending on weight of vehicle.

12’ Min. To Nearest Obstruction

78 1/8”(1985mm)

151 3/16”(3840mm)

131 1/2”(3340mm)

99 3/8”(2524mm)

144”(3660mm)
28 1/4”-41 3/8”(730-1050mm)
34 3/8”-55 1/8”(874-1400mm)

5 3/8”-7 1/4”(136-185mm)

109 7/8”(2790mm)

10000LBS(4545kg)

152 3/16”(3865mm)

2HP, Single Phase, 60Hz, 220V

12’ Min. To Nearest Obstruction

Fig 1a- General Specification Fig 1b- Service Bay Layout

VERTICAL CLEARANCE

Check the height of the area where the lift is to be installed. Clearance should be calculated based on the
full raised height of the lift.

Failure by purchaser to provide adequate clearance could result in

unsatisfactory lift performance, property damage, or personal injury.

FLOORING

Be certain you have the proper concrete floor to properly handle the loaded lift. Floor should be in
generally good condition with no large cracks, spalling or deterioration.

Minimum requirements for concrete are 4 inches minimum depth, with steel reinforcement, 3500
PSI, cured for 28 days per local commercial practice.

Floor should be level within 3/8 inch over the installation area. No anchors should be installed within 8
inches of any crack, edge, or expansion joint. If these conditions cannot be met, pads can be poured to
accommodate the lift.
Check with local building inspectors and/or permits office for any special instructions or approvals
required for your installation.

Failure by purchaser to provide the recommended mounting
surface could result in unsatisfactory lift performance, property
damage, or personal injury.

Always wear ANSI approved safety goggles when installing and using this product.

ELECTRICAL REQUIREMENTS

For lift installation and operation for single phase units, it is necessary to have a dedicated circuit with a
25 amp circuit breaker or time delay fuse.

SAFETY NOTICES AND DECALS

For your safety, and the safety of others, read and understand all of the safety notices and decals
included here.

READ ENTIRE MANUAL BEFORE ASSEMBLING, INSTALLING, OPERATING, OR
SERVICING THIS EQUIPMENT.
PROPER MAINTENANCE AND INSPECTION IS NECESSARY FOR SAFE OPERATION.
DO NOT OPERATE A DAMAGED LIFT.

Safety decals similar to those shown here are found on a properly installed lift. Be sure that all safety
decals have been correctly installed on the Power Unit reservoir. Verify that all authorized operators
know the location of these decals and fully understand their meaning. Replace worn, faded, or damaged
decals promptly.

Do not attempt to raise a vehicle on the lift until the lift has been

correctly installed and adjusted as described in this manual.

RECEIVING

The shipment should be thoroughly inspected as soon as it is received. The signed bill of lading is
acknowledgement by the carrier of receipt in good condition of shipment covered by our invoice.
If any of the goods called for on this bill of lading are shorted or damaged, do not accept them until the
carrier makes a notation on the freight bill of the shorted or damaged goods. Do this for your own
protection.
NOTIFY our company AT ONCE if any hidden loss or damage is discovered after receipt.

Component Packing List

DESCRIPTION QTY

Power Column Ass’y 1 Synchronizer Cable 2

Idler Column Ass’y 1 Hydraulic Hose Pack 1

Power Column Extension 1 Power Lock Cover 1

Idler Column Extension 1 Idler Lock Cover 1

Overhead Ass’y 1 Hardware Box 1
Rear Arm Ass’y 2

Front Arm Ass’y 2

DESCRIPTION QTY

INSTALLATION

IMPORTANT: Always wear safety glasses while installing lift.

TOOLS (MINIMUM REQUIRED)

a. Banding Cutter
b. Tape measure, 16ft
c. Chalk line
d. 4ft level
e. 10” adjustable wrench
f. Standard open end wrenches 7/16”-15/16"
g. Needle nose pliers
h. Hammer drill
i. 2lb hammer
j. Torque wrench: 150 foot pounds minimum
k. 12 ft. Step ladder
l. Anti-Seize lubricant (for arm pins)

LAYOUT

1. Layout the service bay according to the architect’s plans or owners instructions (see Fig 1b). Be

certain that the proper conditions exist.

2. Assemble column extension to column using M12×30 Hex bolt. Repeat for opposite column and

extension.

3. Using the Overall Width(C) as a guideline, chalk two parallel (line 1 and line 2) on the concrete

floor within 1/8 inch tolerance.

4. Determine the location of the Column Ass’y on either chalk line and mark the base plate dimension

Overall Width(L) .

Fig 2 – Floor Plan
Be sure to stay within a 1/4 inch overall tolerance. This will eliminate any
difficulty in final assembly or possible premature chain wear or
misalignment.
The chalk line layout is very important. If it is not followed accurately

problems may arise in final assembly and operation.

5. Using a lifting device, Erect both column assemblies with the installation lines.

ANCHORING

6. The anchor bolts must be installed at least 8 inches from any crack, edge, or expansion joint.

7. Use a concrete hammer drill with a carbide bit. Do not use excessively worn bits or bits which have

been incorrectly sharpened. A core bit may be necessary if an obstruction is encountered.

Never substitute with shorter anchor.

8. Recheck “Inside of Columns” dimension, Fig 1. Drill the anchor holes using the base plate as a

template. Drill through the floor if possible or to a depth of 3.5 inches minimum.

9. Vacuum dust from the hole for proper holding power.

10. Shim both columns to plumb using the shims provided. DO NOT shim more than 1/2" at any given

point. Use a level no less than 24” in length to plumb columns.

11. Assemble washer and nut to anchor with nut just below impact section of bolt. Drive anchor into

hole until nut and washer contact base.

12. Tighten power column anchors and recheck column for plumb. Reshim if necessary. Torque to 150

foot pounds to set anchors.

Never remove the lift before the columns Tightened by the anchor bolts.

OVERHEAD BEAM

13. Assemble overhead ass’y to column extension using M12×30 Hex bolt.

14. Install Overhead Limit Switch to Power Column.

SYNCHRONIZER CABLES

15. Manually raise the carriages until each is located on the second lock position.

16. Route synchronizing cables using Fig 3 and attach ends to carriages’ joining using Fig’s 4.

17. Adjust cable tension by adjusting each cable’s adjustment nuts. The cables should be tight with no

slack. Each cable should be the same tension. Be sure as you are tightening the cables that they have
remained in place over the pulleys. Failure to do this will result in damage to the cable.

Fig 3- Cable Routing Fig 4- Attaching
Cable
Prior to operation of lift recheck equalizer cables making sure they are not
crossed or routed improperly. Be sure the cables have remained in place

over the pulleys.

POWER UNIT & HYDRAULIC HOSE

18. Mount Power Unit to power column with M8 hex nuts, M8×20 bolt.

19. Attach hydraulic elbow fitting to power unit.

20. IMPORTANT – To insure proper hose fitting seal without damage to the fitting follow this
procedure for each hose connection: Screw flared fitting on finger tight. Rotate flared fitting 1 1/2 hex
flats (90 deg.). Back the flared fitting off one full turn. Again tighten flared fitting finger tight, then
rotate flared fitting 1 1/2 hex flats (90 deg).

21. Thread power unit hydraulic hose into elbow on power unit. Route hydraulic hose from Idler column
across Overhead to the Power Column.(Fig 6)

22. Once the Power Unit is secured, fill reservoir with #10 weight HYDRAULIC OIL ONLY. Care
should be taken to keep dirt or other contamination out of oil.

Fig 5- Hydraulics

Fig 6

LOCK RELEASE

23. Install Lock Release Stud and Knob to Power Column Lock using one M10 nut.

24. Attach Mechanical Lock Release Cable Assembly to two Column Lock Pawl(Fig 7).

Fig 7 Power Column Lock Idler Column Lock

Release Assembly Release Assembly

THE LOCK RELEASE CABLE ADJUSTMENT IS NOT COMPLETE UNTIL THE LIFT HAS
BEEN LOWERED AND “FINAL ADJUSTMENTS” HAVE BEEN MADE.

ARM INSTALLATION

25. Lubricate the arm pin or carriage arm pin hole with “anti-seize” and install the arms. Insure that the
arm restraint gears engage and disengage properly. Arm restraints any binding occurs, insure that the
large gear mounted to the arm has been factory installed tight against the arm pin.

ELECTRICAL

26. Connect the Overhead Limit Switch Cord to Power Unit as shown in nameplate on the Power Unit.

27. Connect Power Unit to suitable electrical source as shown in nameplate on the Power Unit.

28. IMPORTANT: AFTER WIRING HAS BEEN COMPLETED, TEST OPERATION OF POWER
UNIT & OVERHEAD LIMIT SWITCH. WHILE RAISING LIFT, OPERATE OVERHEAD
SHUTOFF BAR. POWER UNIT MOTOR SHOULD STOP WHEN SHUTOFF BAR IS RAISED.

FINAL ADJUSTMENTS

29. Lower the lift to the floor and raise the lift approximately one foot.

30. Start with Idler side first. Slowly and carefully loosen the bleed plug on top of the cylinder just

enough to allow the entrapped air to escape. Repeat for power side.

31. Energize the power unit and raise 6 inches. Repeat previous step until no air comes out of cylinder.

32. Pressure test hydraulic system. Energize power unit, raise lift to full rise and continue to run motor

for additional 10 seconds. (NOTE: pressure relief will make a high pitch squeal sound for these 10
seconds.) Check hydraulic system for leaks.

33. Energize power unit again for 10 seconds. With a clean rag, wipe down both cylinder rods. If

lubricant is not wiped clean from the cylinder rod, the cylinder will appear to be leaking.

34. Cycle lift to insure that the latches operate simultaneously. Lower the lift onto the locks and insure

that neither lock will wobble (it is possible for the carriages to appear to be resting on the locks
when actually only one carriage is resting on its lock and the other carriage is being supported by
the synchronizing cable).

35. Lower lift to the floor. Pull and release lock release handle while watching idler column lock.

Adjust threaded sleeve cable adjuster nuts until idler column lock disengages and engages fully.
When properly adjusted, the idler column lock should just come to rest against the back of the
column when engaged and fully out against the tab when disengaged.

IMPORTANT: IF IDLER SIDE LOCK PAWL DOES NOT FULLY DISENGAGE, DAMAGE

MAY RESULT TO IDLER SIDE CARRIAGE AND OR CABLE SYNCHRONIZING SYSTEM.

36. Tighten and trim wire ties.

37. Snap lock cover over each lock assembly.

OPERATION PROCEDURE
SAFETY NOTICES AND DECALS

This product is furnished with graphic safety warning labels, which are reproduced on page 3 of
these instructions. Do not remove or deface these warning labels, or allow them to be removed or
defaced. For your safety, and the safety of others, read and understand all of the safety notices and
decals included.

OWNER/EMPLOYER RESPONSIBILITIES

The owner/employer shall make sure that all lift operators are qualified and trained in the safe use and

operation of the lift in accordance with the manufacturer’s operating instructions. They also shall
display the lift manufacturer’s operating instructions and maintenance schedule in a conspicuous
location and area, convenient to the operator.
The owner/employer shall establish procedures to periodically inspect and maintain the lift in
accordance with the lift manufacturer’s suggestions. The employer shall insure that the lift inspector and
maintenance personnel are qualified and that they are adequately trained in these procedures. The
employer shall maintain these periodic inspection and maintenance records.

LIFTING A VEHICLE

1) Insure that the lifting arms are parked, out to full drive thru position.

2) Position the vehicle in the service bay so that the vehicle’s center of gravity is on a line between the

two columns, and so the vehicle is centered between the two columns.

DO NOT EXCEED 2500 POUNDS PER ARM.
DO NOT ATTEMPT TO LIFT THE VEHICLE WITH ONLY TWO ARMS, AS THIS WILL
VOID THE WARRANTY
INSURE THAT THE HIGHEST POINT ON THE VEHICLE WILL CONTACT THE
OVERHEAD LIMIT SWITCH BAR
DO NOT PLACE THE VEHICLE IN THE SERVICE BAY BACKWARDS.

3) Position the arms and adapters so all four pads contact the vehicle simultaneously.

The vehicle should remain level during lifting.

4) Raise the lift until all four wheels are off the ground. Test the stability of the vehicle by attempting

to rock the vehicle. Check adapters for secure contact with vehicle lift points. If the vehicle seems
unstable, lower the lift and readjust the arms. If the vehicle is stable, raise the vehicle to a height a
few inches above the desired working height.

5) Lower the vehicle until the safety latches on both columns engage. The vehicle should remain level

when both latches are engaged. If one side engages and the other continues to descend, stop
lowering the vehicle, raise it several inches, and try again to engage both latches.

Always lower lift into locks before entering the area beneath the vehicle.
Always use safety stands when removing or installing heavy components.

LOWERING A VEHICLE

1) Insure that the area under the vehicle is clear of personnel and tools.

2) Raise the vehicle until both latches are free.

3) Disengage the latches by pulling down and holding the lock release lever.

4) Lower the vehicle by depressing the lowering valve handle.

5) Continue to lower the vehicle until the carriages stop against the base plate. Retract the extension

arms, and park them.

MAINTENANCE

To avoid personal injury, permit only qualified personnel to perform maintenance on this equipment.
The following maintenance points are suggestions for a preventive maintenance program. The actual

program should be tailored to the particular installation.

1) If lift stops short of full rise or chatters, check fluid level and bleed both cylinders per Installation

Instructions.

2) Replace all Safety, Warning or Caution Labels if missing or damaged (See Installation instructions

page 3.)

Daily

1) Keep lift components clean.

2) Check for loose or broken parts.

3) Check hydraulic system for fluid leaks.

4) Check adapters for damage or excessive wear. Replace as required with genuine Lifts parts.

5) Check the lock release activation.

Weekly

1) Check synchronizer cables and sheaves for wear. Replace as required with genuine Lifts parts.

2) Check lock release cable adjustment per Installation Instructions.

IMPORTANT: IF IDLER SIDE LOCK PAWL DOES NOT FULLY DISENGAGE, DAMAGE

MAY RESULT TO IDLER SIDE CARRIAGE AND OR CABLE SYNCHRONIZING SYSTEM.

3) Check synchronizer cable tension per Installation Instructions. Adjust if necessary.

Monthly

1) Torque concrete anchor bolts to 80 ft-lbs.

2) Check overhead shutoff switch. While raising lift, operate overhead shutoff bar. Power Unit motor

should stop when bar is raised.

3) Lubricate carriage slide tracks with heavy viscous grease. (Grease all (4) corners of both columns.)

If any problems are encountered, contact your local service representative.

TROUBLE SHOOTING GUIDE

TROUBLE CAUSE SOLUTION

1) Synchronization cables out of adjustment 1) Adjust cables to the correct tension (See manual) Lift going up unlevel

2) Lift is installed on unlevel floor 2) Shim lift to level columns (Do not exceed ½”)

Carriages not going

up

Carriages not going

down

Locking latches do not

engage

Lift chatters on the
way up

Fluid Leak

Fluid is contaminated 1) Water or foreign substance 1) Replace hydraulic fluid
Slow lowering speed

Footpads slipping from
pickup point when

raising lift

Anchors will not stay

tight

the power unit
Motor will not work

1) Leak in hydraulic system 1) Find and repair leak

2) Overloading the lift 2) keep load under the rated capacity

3) Problem with pressure relief valve 3) Clean or replace the valve

1) Carriage still engaged in the lock 1) Raise lift up, push lift lowering valve, and lower

2) Lowering valve clogged 2) Check lowering valve in power unit

3) Vehicle not loaded (spotted) correctly 3) Check pickup points for that particular vehicle

4) Foreign object blocking the carriage 4) Remove the object

1) Lock release shaft rusted. (Usually occurs on

outside installations or wash bays)

2) Lock release spring broken 2) Replace broken spring

3) Lock release cables need adjustment 3) Adjust clamp at cable end

1) Air in the cylinders 1) Bleed cylinders

1) Defect in hydraulic hose 1) Replace hydraulic hose

2) Defect in fitting 2) Tighten fitting, and replace if necessary

3) Defect in cylinder packing (seals) 3) Repack seals or replace cylinder if necessary

1) Plugged cylinder orifice 1) Remove and clear orifice

2) Lowering valve (screen) clogged 2) Remove and clean valve

3) Wrong weight of fluid 3) Replace with recommended fluid

4) Pinch or restriction in hydraulic hoses 4) Clean and/or replace hydraulic hoses

5) Foreign object in carriage 5) Remove foreign object

1) Column not plumb 1) Plumb columns

1) Oversized holes 1) Relocate lift using a new bit to drill holes

2) Concrete floor thickness or PSI strength not

sufficient

3) Anchors not torqued correctly 3) Torque bolts to the correct spec

1) Overloading the lift 1) Keep load under the rated capacity. Abnormal noise from

2) Hydraulic fluid low 2) Check fluid level, fill and bleed cylinders

1) Defect in motor 1) Replace motor

2) Fuse disconnected 2) Fix fuse

3) Defect in power button 3) Replace button

4) Overhead shut-off cable is activated 4) Deactivate shut-off system

5) Incoming power voltage is less than 220V

that is needed

1) Remove covers, oil the mechanism. Operate locks

to allow oil to penetrate

2) Tear out old concrete and pour new pads for the

lift

5) Have licensed electrician check the wiring

PARTS LIST

NO.

1 POWER COLUMN WELD 1 47 PULLEY AXES 2

IDLER COLUMN WELD 1 48 MIDDLE SPACE SLEEVE 2

2 POWER EXTENSION WELD 1 49 BOLT M8x25 2

IDLER EXTENSION WELD 1 50 STROKE SWITCH 1

3 POWER LOCK COVER 1 51 SHUTOFF BAR CUSHION 1

IDLER LOCK COVER 1 52 SHUTOFF BAR 1

4 SCREW M5x10 8 53 PROTECT CONNECTOR 1
5 BALL HANDLE 1 54 PULLEY FIX HOLDER 1R/1L
6 LOCK RELEASE STUD 1 55A SADDLE PAD 4
7 NUT M10 1 56C FLEXIBLE SADDLE 4
8 "C" RING 20 4 58 C RING 28 4

9 LOCK RELEASE WIRE PIN 2 61C BACK ARM 2
10 LOCK RELEASE SPRING1 2 62C BACK HOLDER 2
11 LOCK RELEASE SPRING2 2 63 WASHER 10 4
12 LOCK RELEASE SHART 2 64 SPRING WASHER 10 16
13 LOCK RELEASE CONNECTOR 2 65 LOCK SCREW 4
14 BOLT M6 2 66 HOLDER PIN 4
15 SPRING PIN φ6x35 2 67 SCREW M10x25 12
16 LOCK PAWL 2 68 GEAR WHEEL 4
17 WASHER 2 69 LIMITED BOLT 4
18 WHEEL AXES 4 70 SPRING PIN 4x24 4
19 WHEEL 4 71 SPRING PIN 4x30 4
20 WASHER 6 8 72 LIMITED SPRING 4
21 SPRING WASHER 6 8 73 LEVEL LIMITED BOLT 4
22 NUT M6 9 74 SLIDE BLOCK 16
23 BOLT 1 75 LIFT ARM 2
24 SPACE SLEEVE 1 76 BUMP SHIELD BLOCK 2
25 BOLT M12x30 28 77 WASHER 8 4
26 WASHER 12 28 78 BOLT M8x30 4
27 SPRING WASHER 12 28 80C FRONT FLEXIBLE ARM 2
28 NUT M12 28 81C FRONT FLEXIBLE HOLDER 2
29 LONG HYDRAULIC HOSE 1 82 BOLT M12x45 2
30 TRIANGLE CONNECTOR 1 83 CROSSBEAM JOINTING 1
31 PUMP OUTPUT HYDRAULIC HOSE 1 84 SYNCHRONIZER CABLES 2
32 CYLINDER CONNERCTOR 1 85 NUT M16 6
33 POWER UNIT 1 86 LOCK NUT M8 3
34 SHORT HYDRAULIC HOSE 1 87 SMALL WIRE ROPE 1
35 CYLINDER CONNERCTOR 2 88 NUT M4 2
36 CYLINDER 2 89 WASHER 4 2
37 NUT M8 4 90 SPRING WASHER 4 2
38 BOLT M5x8 10 91 BOLT M4x30 2
39 TUBE CORD BASE 5 92 BOLT M8x20 4
40 BOLT M6x20 4 93 TUBE CORD 1
41 PROTECTIVE BOLT 2 97 LOCK NUT 6 4
42 PROTECTIVE NUT 2
43 R-RING 6
44 WASHER 4
45 SPACE SLEEVE 4
46 PULLEY WHEEL 6

DESCRIPTION QTY NO.

DESCRIPTION QTY

PARTS LIST

NO. DESCRIPTION QTY

10
11

1

2

3

4

5
6

7

8

9

RAM

RING

RAM HEADER

GUIDE RING

CYLINDER

BOLT

WASHER

COVER
O-RING

O-RING

O-RING

1
1

1
1

1

1

1

1

1

1
1

b11

b2

b10

b9

b8

b7

b6

b1

b3

b4

b5

2

28

27

26

25

8

10

11

4

3

9

13

12

14

7

6

5

18

19

20

15

16

17

8

21

22

1

18

IDLER COLUMN EXTENSION

OVERHEAD ASSY

52

51

91

83

50 90

43

44

45

46

88

89

53

49

86

86

48

25

39

26

47

38

46

28

27

45

42

44

43

19

41

22

2120

40

54

20

21

38

39

22

POWER COLUMN EXTENSION

IDLER COLUMN ASSY

55A

56C

97

58

REAR ARM ASSY

61C

FRONT ARM ASSY

82

26

27

69

70

71

66

67
64

78

81C

68

77

62C

63
64
65

80C

72

73

75

36

76

46

43

POWER COLUMN ASSY

92

37

33

Limited 90 day warranty

Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for
the period of ninety days from the date of purchase. This warranty does not apply to damage due directly or
indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, or to lack of
maintenance. We shall in no event be liable for death, injuries to persons or property, or for incidental, contingent,
special or consequential damages arising from the use of our product. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation of exclusion may not apply to you. THIS
WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
THE WARRANTIES OF MERCHANTABILITY AND FITNESS.

To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid.
Proof of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection
verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase
price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our
expense, but if we determine there is no defect, or that the defect resulted from causes not within the scope of
our warranty, then you must bear the cost of returning the product.

This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]