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ALL ALUMINUM 125/16

2.

ALL ALUMINUM TVL 125/16

ATTENTION INSTALLERS:

Changes are made periodically to the installation procedure to comply with engineering 

changes. To ensure proper liftgate operation, it is VERY IMPORTANT to read and understand 

the installation instructions before attempting an installation. Installers also 

MUST read and 

understand the liftgate’s Owner’s Manual before installing the liftgate, so they can operate the 

liftgate safely as required during different stages of the installation process. 

NEVER perform 

a modification on the liftgate, which is not specifically covered in this manual or which is 

unauthorized by Thieman. Modifications may result in failure of the liftgate and may create 

hazards for liftgate installers, operators, or maintainers. Serious damage, equipment failure, or 

operator injury could result from improper installation. This equipment 

MUST have all decals 

applied properly. 

FAILURE to apply all decals properly will VOID all warranties! Any installer 

with questions or doubts should contact Thieman before proceeding.
NOTES:

1.  All maximum mounting dimensions are shown with the vehicle empty; all minimum 

mounting dimensions are shown with the vehicle loaded.

2. Check the bed height when vehicle is parked on a level surface.

3.  Refer to figure 1 and table 1 for overall dimensions of liftgates and bed height ranges for 

different models.

4.  The TVL series railgates are all level ride, which means when the vehicle is located on a level 

surface; the rails should be perpendicular to the ground. When mounting, consideration 

should be given to the platform position with the truck both empty and loaded. See figure 2 

and 3.

NOTES:

1.  All bed height ranges shown in tables 1 allow installer to provide a minimum of 18" of 

ground clearance by cutting off the lower end of the rail as needed unless otherwise stated. 

Rails must NOT be cut more than 22" above the ground (Note: 22" measurement must 

be made with truck unloaded. See Step 9 of Installation Instructions. On special orders, 

consult factory as the allowable trim dimensions may vary from what is shown here).

MODEL

TYPE

TVL125/16/20

TVL125A/16A/20A

TVL125LB/16LB/20LB

RAIL 

LENGTH

“A”

83.00

89.00

80.00

FRAME WIDTH

“B”

82, 92, 97, 102

82.00

92.00

97.00

102.00

82, 92, 97, 102

BED HEIGHT

RANGE

33.00-51.00

33.00-37.00

38.00-43.00

33.00-40.00

41.00-43.00

33.00-40.00

41.00-43.00

33.00-40.00

41.00-43.00

33.00-37.00

ABOVE BED

RANGE

NA

16.00

15.00-7.00

16.00

15.00-10.00

16.00

15.00-10.00

16.00

15.00-10.00

16.00

TABLE 1

Summary of Contents for NTEA TVL Series

Page 1: ...ONS IMPORTANT KEEP IN VEHICLE PLEASE READ AND UNDERSTAND THE CONTENTS OF THIS MANUAL BEFORE OPERATING THE EQUIPMENT TAILGATES INC 600 East Wayne Street Celina Ohio 45822 Phone 419 586 7727 Fax 419 586...

Page 2: ...mounting dimensions are shown with the vehicle loaded 2 Check the bed height when vehicle is parked on a level surface 3 Refer to figure 1 and table 1 for overall dimensions of liftgates and bed heig...

Page 3: ...the rear door on the vehicle Step 3 Raise gate and place it against the rear of the vehicle and remove any obstructions where possible If obstruction can not be removed use 6 aluminum spacers 12 long...

Page 4: ...he liftgate once again and square it with the rear sill of the vehicle as shown in figure 4 Temporary supports as shown in figure 5 may be welded to cylinder housing to assist in squaring lift to rear...

Page 5: ...he body structure a rear corner backer plate may be needed as shown in figure 6B for additional support See figure 7 for the vertical spacing of these backer plates DO NOT REMOVE THE FORKLIFT OR CRANE...

Page 6: ...aces to vehicle body and support tubes Then weld liftgate rails to support tubes on both the inside and outside corners of each rail Step 8 These models have plastic oil reservoirs on their power unit...

Page 7: ...ground strap connecting the block to the chassis Where this is the case the factory installed cable usually does not provide an adequate ground circuit for oper ating battery powered liftgates We reco...

Page 8: ...initial setting until the desired tension is reached Line up a hole in the ad justing bracket with one of the two holes in the slider and thread the 38 diameter bolt B through the aligned holes to sec...

Page 9: ...at stow bars are not sitting on the bottom of the resting plate slot so there is ten sion in chains See figure 4B Then unloosen screws on the adjustment angles and move angles so they are tight agains...

Page 10: ...ng Decal High Pressure 4620 14 Lubrication Instruction Decal 4662 15 Lube Location Decal 4 4663 16 Urgent Warning Decal 4681 Step 17 Thieman recommends that the installer perform a weight test of the...

Page 11: ...LIGHT WIRING PICTORIAL...

Page 12: ...Rev 10 21 1M MP108067...

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