Dhollandia DH-RMM 25 User manual

Order ref: xxx Doc: FIT_US installation manual RMM_US EN_2023 Rev: 0 Date: MAY 10, 2023
DH-RMM* 25 / 33 / 44
INSTALLATION MANUAL
Read the manual in its entirety before operating the liftgate
Keep this manual in the vehicle cab, as reference for the driver and liftgate operator
Manufacturer:
DHOLLANDIA US, L.L.C.
E-mail : [email protected]
270 Southridge Parkway
Bessemer City North Carolina, 28016
website : www.dhollandia.com

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DHOLLANDIA
TABLE OF CONTENTS
1UNDERSTANDING SAFETY AND WARNING SIGNS...................................................................................................................... 3
2INTRODUCTION, CONTACT INFO AND DISCLAIMERS................................................................................................................. 4
3SAFETY PRECAUTIONS FOR OPERATION ................................................................................................................................... 6
4SAFETY PRECAUTIONS FOR INSTALLATION............................................................................................................................... 6
5LIFTGATE TERMINOLOGY .............................................................................................................................................................. 8
5.1 DH-RPL liftgate terminology...................................................................................................................................................... 8
5.2 Installation parameters terminology .......................................................................................................................................... 9
5.3 Getting started......................................................................................................................................................................... 11
6INSTALLATION DIMENSIONS AND GUIDELINES ........................................................................................................................ 12
6.1 Installation dimensions............................................................................................................................................................ 12
6.1.1 RMM* - 51” Platform Depth................................................................................................................................................. 13
6.1.2 RMM* - 60” Platform Depth................................................................................................................................................. 15
6.1.3 RMM* - 63” Platform Depth................................................................................................................................................. 16
6.2 Installation resources .............................................................................................................................................................. 16
7BED EXTENSION AND CHASSIS CUT .......................................................................................................................................... 17
7.1.1 RMM* - 51” Platform Depth................................................................................................................................................. 17
7.1.2 RMM* - 60” Platform Depth................................................................................................................................................. 18
7.1.3 RMM* - 63” Platform Depth................................................................................................................................................. 18
7.2 Rear sill cut ............................................................................................................................................................................. 19
8MOUNTING OF THE BED EXTENSION ......................................................................................................................................... 21
9MOUNTING OF THE LIFT FRAME (PREMOUNTED PLATFORM)................................................................................................ 23
10 FIXATION OF THE MOUNT PLATES ............................................................................................................................................. 27
10.1 Fixation of the mount plates OAM010..................................................................................................................................... 27
10.2 General remarks...................................................................................................................................................................... 30
11 INSTALLATION OF ELECTRICAL CONTROLS ............................................................................................................................. 31
11.1 Installation of the control switch (OAE015.PR –E0832.B)...................................................................................................... 31
11.2 Installation of the cabin switch (OAE510.15 –E0393.S.15) .................................................................................................... 33
11.3 Installation of extra controls –2 button remote control (OAE001 –E0787.2.H)...................................................................... 34
12 ELECTRICAL INSTALLATION ........................................................................................................................................................ 36
12.1 Installation of the (+) battery cable and (-) ground cable......................................................................................................... 36
13 PUTTING THE LIFTGATE INTO SERVICE..................................................................................................................................... 39
14 PLATFORM ORIENTATION............................................................................................................................................................ 42
15 MOUNTING OF THE SIDE STEPS................................................................................................................................................. 43
15.1 Mounting the sides steps......................................................................................................................................................... 43
15.2 Mounting of the optional widening blocks (OAM053) .............................................................................................................. 45
15.3 Mounting of the optional bumper light cluster kit (OAM060).................................................................................................... 46
15.4 Mounting of the optional walk ramp kit (OAM054)................................................................................................................... 47
16 LUBRICATION INSTRUCTIONS..................................................................................................................................................... 49

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17 QUALITY CONTROL AND PDI ....................................................................................................................................................... 51
18 DECALS .......................................................................................................................................................................................... 53
18.1 Use of the ‘WARNING. LIFTGATE OUT OF SERVICE. DO NOT ATTEMPT TO OPERATE’ sign ........................................ 55
19 APPENDIX....................................................................................................................................................................................... 56
19.1 Meaning of the safety and warning signs................................................................................................................................ 56
19.2 Prescribed torque values for bolts and nuts ............................................................................................................................ 58
19.3 Electric and hydraulic requirements ........................................................................................................................................ 59
19.4 Safe operator position on the platform .................................................................................................................................... 61
19.5 End note.................................................................................................................................................................................. 62
19.6 Basic wiring diagrams ............................................................................................................................................................. 62
19.7 Checklist for preventative maintenance and repair ................................................................................................................. 62

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1UNDERSTANDING SAFETYAND WARNING SIGNS
•Many safety signs and symbols used in this manual are based on international standards, others refer to specific situations or actions.
•Consult appendix 19.1 on page 56 for an overview of signs and symbols used in DHOLLANDIA manuals, and their meaning. Make
sure you understand these signs and symbols prior to starting the installation.
•Please take special notice of the following signs used in the manual. They indicate the likelihood and severity of a potential injury if
a person fails to follow the instructions presented on the safety sign.
DANGER: indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury. [white letters on red background]
WARNING: indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury. [black letters on orange background]
CAUTION: indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury. [black letters on yellow background]
NOTICE: is used to address practices not related to physical injury. [white letters on blue background]
SAFETY INSTRUCTIONS: indicate general instructions relative to safe work practices, reminders of
proper safety procedures, or the location of safety equipment. [white letters on green background]
SAFETY ALERT SYMBOL: is used to alert the user to potential hazards. All safety messages that
accompany this sign shall be obeyed to avoid harm. [free-standing, or on back-ground colors red,
orange, yellow or black]
WARNING
•Failure to understand and to follow the instructions in this manual can put the operator and any bystanders at great risk of serious
bodily injury and death.
•Prior to operating the liftgate, make sure you understand the safety and warning signs used, and read them in conjunction with
the instructions in this manual.
•If in doubt, DO NOT operate the liftgate. Contact your national DHOLLANDIA distributor. See page 4 for contact info.
NOTICE
SAFETY
INSTRUCTIONS

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DHOLLANDIA
2INTRODUCTION, CONTACT INFO AND DISCLAIMERS
•This manual provides you with the information necessary for the installation of the 2500 –4400 lbs capacity DH-R* fold away lifts.
•It contains general instructions applicable to the most common types of trucks and trailers. Possibly, specific issues particular to your
case are not adequately covered by this manual. If in doubt, contact your national DHOLLANDIA distributor for further assistance
prior to continuing.
•DHOLLANDIA liftgates are regularly adapted to new vehicle and chassis developments and specialized customer requirements.
Therefore, DHOLLANDIA reserves the right to alter product specifications without prior notice. Such modifications might not have
been included at the time this manual was printed.
NOTICE
•Please confirm you have reviewed the most up-to-date version of this manual prior to operation of the associated DHOLLANDIA
liftgate. See below for instructions to download the latest version of the manual.
•It is the sole responsibility of the installer(s) to follow best workshop practices for safety and craftsmanship and to use good
common sense.
•Contact your national DHOLLANDIA distributor if you have any questions regarding the installation, operation, repair and
maintenance of DHOLLANDIA liftgates, or to obtain replacement copies of manuals or decals:
DHOLLANDIA US, LLC
DHOLLANDIA CANADA, Inc.
DHOLLANDIA MEXICO
270 Southridge Parkway
Bessemer City NC 28016
2105 Boulevard des Enterprises
Terrebonne Quebec J6Y1W9
Fracc. Industrial Dinamo Norte
Calle Tierra 103-105
Salinas Victoria CP 65500
Monterrey Nuevo Leon, Mexico
980-443-4446
(company line)
514-360-6125 ext.3
(parts and service)
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[phone]
[e-mail]
The latest version of all manuals can also be downloaded from the DHOLLANDIA website:
www.dhollandia.com → Country & language selection → Downloads → … select required manual
WARNING
•Improper installation can cause damage to the liftgate, can reduce its durability and reliability, and can put the operator and
bystanders at great risk of serious bodily injury and death in many ways.
•It is therefore essential that the liftgates are installed with proper care, in compliance with the installation instructions of this manual
and the fitting and body building instructions of the vehicle manufacturer.
•In case of doubt, ALWAYS contact your national DHOLLANDIA distributor for further advice, prior to continuing.

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•Take notice of the following important disclaimers:
DISCLAIMERS
•DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from operating a liftgate that has
been modified from the original design, without written approval from the manufacturer.
•DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from improper use of the liftgate
or negligence to apply the precautions and instructions of the operation manual.
•DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from incorrect of negligent
installation.
•There are no warranties, express or implied, including the warranty of merchantability or a warranty of fitness for a particular
purpose extending beyond that set forth in this manual.

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3SAFETY PRECAUTIONS FOR OPERATION
•It is essential that the installers understand and apply the safety instructions and precautions contained in the
OPERATION MANUAL issued with the liftgate.
•Therefore, make sure you consult the OPERATION MANUAL prior to installing or operating the liftgate.
4SAFETY PRECAUTIONS FOR INSTALLATION
•It is essential that the personnel involved in installing, servicing and repairing hydraulic liftgates knows, understands
and applies the safety instructions and precautions contained in the GENERAL SAFETY INSTRUCTIONS FOR
INSTALLATION, MAINTENANCE AND REPAIR manual.
•Make sure you consult these instructions prior to installing the hydraulic liftgate.
•Safety instructions are a matter of progressive insight. The basics are listed in this manual, but contact the national
DHOLLANDIA distributor for a copy of the latest set of instructions [see contact info on page 4], or download the
latest edition from the DHOLLANDIA website:
www.dhollandia.com → Country & language selection → Downloads → Operation manuals →
General information →… select required manual
WARNING
•Improper use of the liftgate will put the operator and other parties at great risk of serious bodily injury and death.
•To reduce the risk of serious bodily injury to the operator and any bystanders, the use of the liftgate is restricted to skilled operators,
who have been properly trained, and who know and understand the full content of the operation manual.
•To reduce the risk of serious bodily injury or death, the operator must ALWAYS comply with all safety instructions and warning
labels in the operation manual before and while operating the liftgate.
•Please confirm you have reviewed the most up-to-date version of this manual prior to installation and operation of the associated
liftgate.

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DHOLLANDIA
WARNING
•The installers are exposed to various dangers. Improper use of the liftgate, ignorance and neglect during installation, will put them
at great risk of bodily injury and death.
•Once the liftgate is in service, improper installation can cause damage to the liftgate, can reduce its durability and reliability.
Further, it can also put the operator and bystanders at great risk of serious bodily injury and death.
•Therefore installation works MUST carried out by skilled technicians, who have been professionally trained, and have mastered
the contents of all manuals:
1. OPERATION MANUAL
2. INSTALLATION MANUAL
3. GENERAL SAFETY INSTRUCTIONS FOR INSTALLATION, MAINTENANCE AND REPAIR
•ALWAYS confirm you have reviewed the most up-to-date version of these manuals prior to installation and operation of the
associated DHOLLANDIA liftgate.
•In case of doubt, ALWAYS contact the national DHOLLANDIA distributor for further advice, prior to continuing.
•ALWAYS wear appropriate Personal Protective Equipment. This includes but may not be limited to: safety glasses with side
guards or a wrap-around face shield; steel toe safety shoes; fire-resistant overalls; protective gloves; adequate ear protection; a
safety helmet when working under the vehicle chassis.
•NEVER wear loose-fitting clothes that may get trapped in the moving parts of the liftgate, or in any machinery and tools used for
the installation. Don’t wear rings, bracelets, necklaces, watches etc…
•ALWAYS use the proper tool for the job. Replace worn or damaged tools before use.
•Pay special attention to the lifting devices (forklifts with slings, overhead cranes, hoists, etc.) used to handle the liftgates, and for
the clamping tools used to clamp the liftgate, its platform, mount plates and various other components to the vehicle chassis and
/ or body. Ensure these tools are appropriate for the job, and in good working order.
•Place the vehicle on a flat even ground and chock the wheels so that it cannot move during the installation. In case of a motor
vehicle, make sure the engine is off and the parking brake is engaged.
•Do not work underneath the liftgate or within reach of the platform and the moving parts, without properly securing and supporting
the platform and the lift frame against an accidental fall. Use an overhead crane and hoists, a forklift with slings or equivalent
means to secure the heavy components.
•NEVER modify DHOLLANDIA liftgates or their mount plates, NEVER deviate from the described installation procedures without
prior written consent by the manufacturer.

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DHOLLANDIA
NOTICE
•Make sure the main battery power is disconnected while installing the liftgate. Connect the battery power to the liftgate only when
the installation is completed, or as required in the installation instructions.
•DHOLLANDIA liftgates are designed as a bolt-on system, and don’t require any welding. See appendix 19.2 on page 58
for prescribed torque values.
•If for any reason, troubleshooting and / or repair might be needed during the installation process, consult and follow
the guidelines and safety instructions of the MAINTENANCE MANUAL.
•If for any reason, welding would be required, please take note of the following precautions:
5LIFTGATE TERMINOLOGY
5.1 DH-RPL LIFTGATE TERMINOLOGY
•Refer to the OPERATION MANUAL for an overview of the most important terminology used in DHOLLANDIA manuals.
CAUTION
Welding on galvanized parts can produce hazardous fumes. To avoid intoxication:
•ALWAYS wear a suitable respirator.
•ALWAYS provide good ventilation.
•ALWAYS grind off the galvanization from the areas to weld.
•Most liftgates are equipped with thermoplastic hoses that can be damaged by hot metal chips, welding sparks and
slag. Damage to a hose can lead to sudden loss of hydraulic pressure and an accidental drop of the platform.
•The penetration of welding sparks and slag can also cause a flash fire.
•Both types of incidents can put the welder or installer and any bystanders at great risk of personal injury or death.
To avoid these risks:
→ALWAYS protect and cover thermoplastic hoses with a welding blanket, prior to grinding, drilling and welding.
→ALWAYS inspect the hydraulic hoses at the end of the installation process. Make sure all hoses are
undamaged, replace them if required.
Welding can cause severe damage to the electronic components of the vehicle and liftgate. To prevent damage:
•ALWAYS follow the instructions and precautions of the vehicle manufacturer.
•DO NOT weld if this is not authorized by the vehicle manufacturer.
•ALWAYS disconnect the positive and negative battery terminals.
•ALWAYS connect the ground directly to the component being welded, as close to the weld as possible.
Welding should be done by skilled and qualified installers only.

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DHOLLANDIA
5.2 INSTALLATION PARAMETERS TERMINOLOGY
larm
Lift ARM length
Length of the lift arms
vfh max
Vehicle Floor Height max
Max. vehicle floor height (UNLOADED), applicable for the given arm length
vfh
Vehicle Floor Height
Actual vehicle floor height (UNLOADED)
vfh min
Vehicle Floor Height min
Min. vehicle floor height (FULLY LOADED)
cth max
Chassis Total Height max
Max. height from underside of chassis to top of the vehicle floor, applicable for
the given arm length
cth
Chassis Total Height
Actual height from underside of chassis to top of the vehicle floor
mfc
Mounting height Floor to Center of lift
arm
Mounting height of lift frame under the vehicle: measured from the top of vehicle
floor to the center of the lift arm
mft
Mounting height Floor to top of lift frame
Tube
Mounting height of lift frame above the ground: measured from the floor of the
vehicle to the top of the lift frame tube
mpg
Mounting clearance Plates to Ground
Ground clearance under liftgate
pd
Platform Depth
Overall platform depth

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lof
Lift Overhang to Frame
Required overhang to end of lift frame
lom
Lift Overhang to Mount plates
Required overhang to the back side of the mount plates
lop
Lift Overhang to Power pack
Required overhang to end of the premounted power pack
lac
Lift Arm Center
Center width of the lift arm
chw
CHassis Width
Chassis width of the vehicle
bwo min
Body Width Outside min
Min. body width with power pack in premounted position

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5.3 GETTING STARTED
•Many vehicle manufacturers issue important instructions on various aspects of the liftgate installation, specific to the brand and type
of chassis. Examples:
→welding instructions or the prohibition to weld
→instructions on chassis drilling and bolt-on connections to the chassis
→recommendations on the use of hydraulic stabilizing legs
→guidelines on fuses, electrical interfaces, and the connection of battery and ground cables, etc.
NOTICE
•ALWAYS verify and ensure compatibility between the liftgate and the vehicle.
•ALWAYS ensure compliance with the fitting and body building instructions issued by the vehicle manufacturer.
•Make sure planned modifications to the vehicle chassis and body will not adversely affect the strength and integrity of the vehicle.
•If the instructions of vehicle manufacturer conflict with the installation instructions issued by DHOLLANDIA (e.g. on fuse ratings,
etc.), contact your national DHOLLANDIA distributor for further advice. See contact info on page 4.
•Place vehicle on a flat even ground and chock the wheels so that it cannot move during the installation process. In case of a motor
vehicle, switch off the engine and engage the parking brake before starting.
•Verify if the installation kit is complete and that all parts needed to install the liftgate are present.
•Compare the voltage of the batteries with the voltage of the hydraulic power pack of the liftgate.
•Compare the actual vehicle dimensions with the maximum installation parameters indicated in the INSTALLATION DRAWING or
technical documentation. If the actual dimensions go outside of the maximum installation parameters, DON’T continue and contact
your national DHOLLANDIA distributor for further advice.
•Verify and make sure that the vehicle chassis and body are strong enough to support the forces induced by the liftgate at its maximum
rated capacity. Refer to the instructions of the vehicle manufacturer for calculation and construction guidelines.
•Execute the required stability and weight distribution calculations.
•Make sure that the body is accurately fitted to the vehicle chassis.
•Remove all objects that impede the installation of the liftgate (bumper bar, spare wheel carrier, pallet racks, toolboxes, etc.). If
necessary, consult with the vehicle manufacturer for replacement solutions (e.g. special spare wheel carriers, exhaust pipe
modifications, etc.).
•Finish the liftgate in accordance with the road legislation of the state where the vehicle will be registered.
•When connecting hydraulic couplings, make sure that the connections are clean. Don’t contaminate the hydraulic oil.
•Grease all bearings and pins before putting the liftgate into service. Preferably, put grease in the bearings before mounting the
corresponding articulation pin.
•After installation, work through the checklist of the Pre-Delivery Inspection (PDI) test. Make sure the final inspection is signed off by
an inspector who is not part of the installation team.
•Do not pressurize any liftgate functions (LIFT / LOWER) before the installation is fully finished.
•During installation and testing, verify and make sure that the liftgate and its moving parts don’t interfere with any of the vehicle
systems (e.g. the suspension, braking system, hydraulic and electrical circuits, etc.), or cause damage to them.

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6INSTALLATION DIMENSIONS AND GUIDELINES
6.1 INSTALLATION DIMENSIONS
NOTICE
•This INSTALLATION DIMENSIONS chapter will be broken out into sections to address all standard configurations of the
DHOLLANDIA RMM* liftgate.
•Standard platform depths are available with varying lift arm and hydraulic cylinder lengths.
•Lift arm lengths change critical fitting dimensions, chassis cuts for platform stowing, and cuts to the rear vehicle sill.
•Please see installation dimensions on the following pages.

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6.1.1 RMM* - 51” Platform Depth
RMM* 51” Platform Depth –bed heights 39.5” –47”
Remove raw steel installation guide bracket to fit the 51” model
RMM* 51” Platform Depth –bed heights 47” – 54”
Remove raw steel installation guide bracket to fit the 51” model

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DHOLLANDIA
NOTICE
•Remove the installation guide bracket before positioning the liftgate under the vehicle.
•NOTE: if the dimensions above cannot be achieved, or if the lift frame tube will not level out, the installation guide bracket may
be removed, and the given dimensions can be sought manually with a floor jack.
•The MAX vehicle floor height vfh is measured on an UNLOADED vehicle. In case of a higher vfh, the risk exists that the platform
will not reach the ground.
•The LADEN vehicle floor height vfh is measured on a FULLY LOADED vehicle. In case of a lower vfh, the risk exists that the
platform will not fold / unfold under the bed extension.

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6.1.2 RMM* - 60” Platform Depth
RMM* 60” Platform Depth –bed heights 46” – 56”
NOTICE
•Use the installation guide bracket to help position the lift frame tube and mount plates into the proper position.
•NOTE: if the dimensions above cannot be achieved, or if the lift frame tube will not level out, the installation guide bracket may
be removed, and the given dimensions can be sought manually with a floor jack.
•The MAX vehicle floor height vfh is measured on an UNLOADED vehicle. In case of a higher vfh, the risk exists that the platform
will not reach the ground.
•The LADEN vehicle floor height vfh is measured on a FULLY LOADED vehicle. In case of a lower vfh, the risk exists that the
platform will not fold / unfold under the bed extension.

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6.1.3 RMM* - 63” Platform Depth
RMM* 63” Platform Depth –bed heights 48” – 56”
NOTICE
•Use the installation guide bracket to help position the lift frame tube and mount plates into the proper position.
•NOTE: if the dimensions above cannot be achieved, or if the lift frame tube will not level out, the installation guide bracket may
be removed, and the given dimensions can be sought manually with a floor jack.
•The MAX vehicle floor height vfh is measured on an UNLOADED vehicle. In case of a higher vfh, the risk exists that the platform
will not reach the ground.
•The LADEN vehicle floor height vfh is measured on a FULLY LOADED vehicle. In case of a lower vfh, the risk exists that the
platform will not fold / unfold under the bed extension.
6.2 INSTALLATION RESOURCES
•If in doubt about any installation parameters given, please reach out to your local DHOLLANDIA distributor.
•See contact info on page 4.

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7BED EXTENSIONAND CHASSIS CUT
•Before installation, verify the vehicle rear sill will support the required loads.
•Remove all objects that are mounted in the overhang / mounting space required by the liftgate (ICC, spare tire carrier, pallet racks,
toolboxes, walk ramps etc…).
•The installation can be a standard mount whereby the bed extension is added behind the rear sill of the vehicle body. Or it can be a
flush mount [Contact DHOLLANDIA for guidance], whereby the bed extension is integrated into the vehicle floor.
•For standard mounts, remove dock bumpers, steps, or any protrusions that would prevent the bed extension from being mounted
flush against the rear door sill.
•Follow the chassis cut dimensions given below. Trim the chassis beams, long sills, rear sill to the indicated dimensions.
•It is possible to mount the lift at a higher ground clearance mpg; or at a lower ground clearance (e.g. to fit within a shorter mounting
space). Ask DHOLLANDIA to confirm the required chassis cut dimensions, as these might change in relation to the new ground
clearance mpg. See contact information on page 4.
7.1.1 RMM* - 51” Platform Depth
Chassis Cut - RMM* 51” - Platform Depth
bed heights 39.5” –47”
bed heights 47” –54”

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7.1.2 RMM* - 60” Platform Depth
Chassis Cut - RMM* 60” - Platform Depth:
bed heights 46” – 56”
7.1.3 RMM* - 63” Platform Depth
Chassis Cut - RMM* 63” - Platform Depth:
bed heights 48” – 56”
NOTICE
•The chassis cuts above are given for the recommended mounting dimensions, and standard bed extension size of 12”, given in
section 6.1 on page 12.
•Deviation from the recommended mounting height will cause a change in the chassis cut needed.
•Be sure to consider these factors when performing the chassis cut for the installation of your liftgate.
•Contact DHOLLANDIA if you have questions. Please see contact info on page 4.
•Where chassis beams, longs sills, the rear sill and other steel chassis or body components have been cut, grinded, drilled, etc…,
the installer should apply adequate anti-corrosive coating to protect the vehicle and body against corrosion. Check, and make
sure you comply with the instructions of the OEM vehicle manufacturer.

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7.2 REAR SILL CUT
•Check the illustrations below to verify if a rear sill cut will be needed.
•The standard 12” bed extension (option OAM051) will have cut outs to accommodate any rear sill cut required.
RMM* 51” Platform Depth –bed heights 39.5” –47”
RMM* 51” Platform Depth –bed heights 47” –54”