RAMP DOOR INFINITE 4
I UiPPERT HINGE’ INSTALLATION is
DOORS
Weld On 2. Rear cross member must be tied to the
next forward cross member. A support
1. Tube must be added to the hinge tube must be tied into the frame directly
attachment area of the ramp door. forward of the adjustment bracket
Tube must be 1” x 3”- 8 ga. tube at minimum. Forward of each hinge
minimum (Fig. 1A). assembly is suggested. Support tube
must be 2” x 3”-8 ga. tube minimum
Fig. 1 (Fig. 2).
iY 1
Suggested Suggested
3. Hinge brackets weld locations 4. Bumper or rear cross member must be
noted below. Full welds over the 8 ga. minimum (Fig. 4A). Reinforcing
length of each weld surface. Weld welds are to be applied to the 1” x 3”
both sides of bracket (Fig. 3). tube opposite of the hinges to ensure
the torque on the hinges does not pull
the door frame apart.
wera | NOTE: Weld location highlighted in red.
| ae
Habe ‘ace,
Q CY we] Loe]
Rev: 01.17.25 Page 1 CCD-0002042

Y RAMP DOOR INFINITE 4
CiPPERT 6 =
" HINGE’ INSTALLATION A
DOORS
Weld On
NOTE: Installation requirements and instructions for torsion hinge are for 5 and 8 2 wide trailers.
The operation of this hinge will apply 5,000 — 9,000 in/Ib of force to your trailer.
The hinge and all components MUST be welded to the trailer strong enough to withstand the
in/lb forces being applied to the door and frame. Read and fully understand Instructions before
installing hinge. Failure to adhere to these instructions and requirements shall void the limited
warranty.
Installation and Requirements
1. The rear cross member and door of the trailer/frame must be designed, built and braced to eliminate
any flexing. The same must be able to withstand the force applied to them by the torsion hinge while
the door is being operated.
2. All door hinge brackets (Fig. 5A) must rest completely against the door without any gaps prior to
welding. The Hinge must be centered on the door. The welds must be strong enough to withstand the
in/lb forces applied. (Soldering and brazing are not acceptable.)
3. As the door is being installed, the frame hinge brackets (Fig. 5B) must be rotated until full contact is
made with the rear cross member. The welds must be strong enough to withstand the in/Ib forces
applied. (Soldering and brazing are not acceptable.)
4. Insert the hinge end tube assembly (Fig. 5A - see diagram) into the end of the hinge.
Rev: 01.17.25 Page 2 CCD-0002042

RAMP DOOR INFINITE °
CLIPPERT HINGE’ INSTALLATION a
DOORS
NOTE: 14 brackets on a double system
7 brackets on a single system

Fig. 5A - Bracket Detail
Fig. 5B- Bracket Detail
Rev: 01.17.25 Page 3 CCD-0002042

ViiPPERT RAMP DOOR INFINITE 3
wi @ -
HINGE’ INSTALLATION z
DOORS
Weld On
1. Maintain proper alignment with the hinge assuring that the end tube is installed on the same
centerline as the hinge. The welds must be strong enough to withstand the in/Ib forces applied.
(Soldering and brazing are not acceptable.)
2. Weld the frame torsion bracket assembly (Fig. 5B) to the rear cross member with the back surface of
the bracket making full contact with the rear cross member. The welds MUST be strong enough to
withstand the in/Ib forces applied. (Soldering and brazing are not acceptable.)
3. Turn adjustment bolt (Fig. 7 Bolt A) clockwise to add preload as desired and lock the jam nut
(Fig. 7 Nut B) to the pivot shaft (Fig. 7 Shaft C) after adjustment is made.
NOTE: Adding preload will lessen the force required to raise the ramp door, however it will increase the
closing force of the door.
NOTE: Hinge does NOT come from Lippert pre-adjusted.
All attachment points MUST have sufficient welds. Any flexing of the frame will result in
fatigue fracture at attachment point. Do not attach the torsion hinge to a frame or door that flexes
at the point of attachment. Do not open the door with the infinite hinge only tacked, it MUST be
fully welded before operation.
Do not stand behind the door while operating. Keep all body parts clear of the door while closing.
Maintenance
Add grease during torsion hinge installation final assembly. General purpose chassis grease is recommended.
Annual maintenance should be performed and documented with a visual inspection for any damage and
application of lubricant at grease points.
Rev: 01.17.25 Page 4 CCD-0002042

, . RAMP DOOR INFINITE 4
OUPPERT HINGE’ INSTALLATION a
DOORS
ate so a
Fig. 7 - Assembly B

eq
Rev: 01.17.25 Page 5 CCD-0002042

(JuPererr RAMP DOOR INFINITE 3
mi e
HINGE’ INSTALLATION a
DOORS
Bolt On 2. Rear cross member must be tied to the next
forward cross member. A support tube must
1. Tube must be added to the be tied into the frame directly forward of the
hinge attachment area of the adjustment bracket at minimum. Forward of each
ramp door. Tube must be hinge assembly is suggested. Support tube must
1"x 3”-11 ga. tube minimum be 2”x 3”-11 ga. tube minimum (Fig. 9).
(Fig. 8).
ae i Fig.9 Suggested
“isos Tube - 1"x3"
o -11ga.
3. Hinge brackets are bolted using torx 4. Bumper or rear cross member must be
barrel nut and hex cap screw and 11 ga. minimum (Fig. 11). Reinforcing
washers (Fig. 10A). welds are to be applied to the 1” x 3”
tube opposite of the hinges to ensure
5 the torque on the hinges does not
it Pay.
I pull the door frame apart. Note weld
8 location highlighted in red.
— ‘ Bumper or Rear
= Crossmember -
Peet) ah 11 ga. minimum
Rev: 01.17.25 Page 6 CCD-0002042

7 RAMP DOOR INFINITE 3
* -
CiPPERT HINGE” INSTALLATION 2
DOORS
Bolt On
NOTE: Installation requirements and instructions for torsion hinge are for 5 and 8 % wide trailers.
The operation of this hinge will apply 5,000 — 9,000 in/Ib of force to your trailer.
The hinge and all components MUST be bolted to the trailer strong enough to withstand the
in/lb forces being applied to the door and frame. Read and fully understand instructions before
installing hinge. Failure to adhere to these instructions and requirements shall void the limited
warranty.
Installation and Requirements
1... The rear cross member and door of the trailer/frame must be designed, built and braced to eliminate
any flexing. The same must be able to withstand the force applied to them by the torsion hinge while
the door is being operated.
2. All door hinge brackets (Fig 12 Bracket A) must rest completely against the door without any gaps prior
to bolting. The hinge must be centered on the door. The bolts must be strong enough and torqued to
withstand the in/Ib forces applied.
3. As the door is being installed, the frame hinge brackets (Fig. 12 Bracket B) must be rotated until
full contact is made with the rear cross member. The bolts must be strong enough and torqued to
withstand the in/Ib forces applied.
(a) Fig. 12
<
ms
a
4
4
a
4
4
Rev: 01.17.25 Page 7 CCD-0002042

ViuPPERT RAMP DOOR INFINITE -
mi @ -
HINGE’ INSTALLATION A
DOORS
Bolt On
1. Insert the hinge end tube assembly (Fig. 13 Assembly A) into the end of the hinge. Maintain proper
alignment with the hinge assuring that the end tube is installed on the same centerline as the hinge.
The bolts must be strong enough and torqued to withstand the in/Ib forces applied.
2. Bolt the frame torsion bracket assembly (Fig. 14 Assembly B) to the rear cross member with the back
surface of the bracket making full contact with the rear cross member. The bolts must be strong
enough and torqued to withstand the in/Ib forces applied.
3. Turn adjustment bolt (Fig. 14 Bolt A) clockwise to add preload as desired and lock the jam nut
(Fig. 14 Nut B) to the pivot shaft (Fig. 14 Shaft C) after adjustment is made.
NOTE: Adding preload will lessen the force required to raise the ramp door, however it will increase the
closing force of the door.)
NOTE: Hinge does NOT come from Lippert pre-adjusted.
All attachment points MUST have Grade 8 bolts torqued correctly.
Any flexing of the frame will result in fatigue fracture at attachment point.
Do not attach the torsion hinge to a frame or door that flexes at the point of attachment.
Do not stand behind the door while operating. Keep all body parts clear of the door while closing.
Maintenance
Annual maintenance should be performed and documented with a visual inspection for any damage and
application of lubricant at grease points.
Fig. 13 - Assembly A
Ss
% /
L/ 8
Rev: 01.17.25 Page 8 CCD-0002042

RAMP DOOR INFINITE Py
7 nn
CI UIPPERT HINGE’ INSTALLATION in
=
DOORS
Fig. 14- Assembly B
a ‘
ss
; .
,} s RB- s
Q ° C
Asa supplier of a broad array of highly-engineered components in the recreation and transportation product markets, safety, education and customer satisfaction are
our primary concerns. Should you have any questions, please do not hesitate to contact us at 432-LIPPERT (432-547-7378) or by email at [email protected].
Self-help tips, technical documents, product videos and a training class schedule are available at lippert.com or by downloading the LippertNOW app.
Rev: 01.17.25 Page 9 CCD-0002042