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DH-RP* / RM* / RK*
TECHNICAL GUIDE
Manufacturer:
DHOLLANDIA US, L.L.C.
E-mail : Technical.US@dhollandia.com
270 Southridge Parkway
Bessemer City North Carolina, 28016
website :
www.dhollandia.com
phone: 980-443-4446
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
Ph
Order ref: xxx Doc: TECH_US technical guide DHR_US EN_2023 Rev: 3 Date: FEBRUARY 18, 2025
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Summary of Contents for Dhollandia DH-RP Series
- Page 1 DH-RP* / RM* / RK* TECHNICAL GUIDE Manufacturer: DHOLLANDIA US, L.L.C. E-mail : Technical.US@dhollandia.com 270 Southridge Parkway Bessemer City North Carolina, 28016 website : www.dhollandia.com phone: 980-443-4446 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...
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Page 2: Table Of Contents
RM* does not auto-tilt at ground level ............................. 43 APPENDIX ....................................... 44 Meaning of the safety and warning signs ..........................44 Prescribed torque values for bolts and nuts ..........................46 Electric and hydraulic requirements ............................47 End note ....................................49 DHOLLANDIA... - Page 3 Remainder of page left intentionally blank DHOLLANDIA...
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Page 4: Understanding Safety And 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 9.1 on page 44 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. -
Page 5: Introduction Contact Info And Disclaimers
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. -
Page 6: Safety Precautions For Operation
• In case of doubt, ALWAYS contact your national DHOLLANDIA distributor for further advice, prior to continuing. DHOLLANDIA... -
Page 7: Identification
On cylinders On platform • Use this serial number to order replacement parts, or to obtain technical advice from DHOLLANDIA or your local DHOLLANDIA distributor regarding maintenance, troubleshooting and repair. • The following information must be confirmed when ordering replacement parts: o Type, year of construction &... -
Page 8: Liftgate Terminology
15 Toggle-switch control: easy-to-use controls to LIFT / LOWER the platform, mostly mounted in fixed position at the side of the vehicle body, or on the rear post of the body. 16 Extra controls: auxiliary controls besides the main controls that allow full or partial functions. DHOLLANDIA... - Page 9 DHOLLANDIA...
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Page 10: Power Pack
Thermal contact: protects the motor from overheating, acts as a ground for the motor solenoid. 10 Motor solenoid: solenoid responsible for starting the electric motor. 11 Solenoid valve: electrically actuated valve that allows hydraulic fluid to flow when activated 12 Connection block: main junction for connecting the controls of the liftgate. DHOLLANDIA... - Page 11 CURRENT STYLE POWER PACK (≥2023) – FLOW RESTRICTOR TOP (A) NOTE: Gravity down power packs will not include a solenoid valve (11). DHOLLANDIA...
- Page 12 CURRENT STYLE POWER PACK (≥2023) – FLOW RESTRICTOR FRONT (B) NOTE: Gravity down power packs will not include a solenoid valve (11). DHOLLANDIA...
- Page 13 LEGACY STYLE POWER PACK (<2023) – POWER DOWN VALVE EXTERNAL NOTE: Gravity down power packs will not include a solenoid valve (11). DHOLLANDIA...
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Page 14: Electrical Basics And Controls
6 ELECTRICAL BASICS AND CONTROLS • This chapter explains the electrical basics of DHOLLANDIA DH-R* series liftgates. E2051 CONNECTION BLOCK • The orange connection block acts as a junction between the controls and the components of the liftgate. • In the image above, “MC” and “EC” stand for Main Controls and Extra Controls, respectively. This is where the source leads for your controls can be connected to power the various liftgate functions. -
Page 15: Electrical Cheat Sheet
Main 12V source from vehicle batteries to power controls and components Ground Function Activates the motor solenoid, which in turn powers the electric motor Energizes the solenoid valves located on / near the lift cylinder(s) Main 12V source from vehicle batteries to power controls and components Ground DHOLLANDIA... -
Page 16: Schematics
SCHEMATICS • The primary controls for the DH-R* series liftgates are shown wired in default configuration below: 6.2.1 Toggle Switch Control - Power Down – OAH025.1 – OAE015.PR – E0832.B DHOLLANDIA... -
Page 17: Toggle Switch Control - Gravity Down - Oae015.Pr - E0832.B
6.2.2 Toggle Switch Control - Gravity Down – OAE015.PR – E0832.B DHOLLANDIA... -
Page 18: Extra Controls
EXTRA CONTROLS • Some of the popular extra controls for the DH-R* series liftgates are shown wired in the configuration below: 6.3.1 2 Button Wander Lead - Power Down – OAH025.1 - OAE001 – E0787.2.H DHOLLANDIA... -
Page 19: Button Wander Lead - Gravity Down - Oae001 - E0787.2.H
6.3.2 2 Button Wander Lead – Gravity Down - OAE001 – E0787.2.H DHOLLANDIA... -
Page 20: Cabin Switch - Oae510.15 - E0393.S.15
CABIN SWITCH - OAE510.15 – E0393.S.15 • The cabin switch controls for the DH-R* series liftgates is shown wired in the configuration below: DHOLLANDIA... -
Page 21: Flow Diagrams
7 FLOW DIAGRAMS • This chapter outlines flow diagrams for DHOLLANDIA DH-R* series liftgates. • Only the primary controls are shown. • To troubleshoot other configurations, please refer to the previous chapters, or see contact information on page 4. Remainder of page left intentionally blank... -
Page 22: Power Down - Oah025.1 - Oae015.Pr - E0832.B
POWER DOWN – OAH025.1 – OAE015.PR – E0832.B • LIFT function activated: DHOLLANDIA... - Page 23 • LOWER function activated: DHOLLANDIA...
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Page 24: Gravity Down- Oae015.Pr - E0832.B
GRAVITY DOWN– OAE015.PR – E0832.B • LIFT function activated: DHOLLANDIA... - Page 25 • LOWER function activated: DHOLLANDIA...
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Page 26: Troubleshooting
8 TROUBLESHOOTING • This chapter outlines the most common issues encountered with DHOLLANDIA DH-R* series liftgates. CHECKING BATTERIES • Before moving on to any other section of this chapter, measure the voltages throughout the system. • Do this with the vehicle powered off, so normal use case scenarios can be assessed. -
Page 27: Checking Oil
• Please see appendix 9.3 on page 47 for the main types of oil used by DHOLLANDIA. • NEVER allow the hydraulic pump to run dry or without a proper supply of hydraulic fluid in the reservoir. -
Page 28: Testing Solenoid Valves
If no magnetic field is present, and proper voltage is verified to be going to the proper row on the connection block, the valve coil or valve coil harness needs to be replaced. • DHOLLANIDA provides a solenoid tester as part number E0247. Please email Parts.US@dhollandia.com to place an order or to find a local distributor. DHOLLANDIA... - Page 29 • The valve pin (at the base of the valve) may also be depressed while attempting to clean • See the following chapters for how these manual activation methods can be used for troubleshooting. DHOLLANDIA...
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Page 30: Motor Fails To Run
(where the yellow thermal contact wire used to be). NOTICE • If this step has resolved your issue, please contact your local DHOLLANDIA dealer for more information about repairing the thermal contact. See contact info on page 4. •... - Page 31 Check the primary controls harness for shorts, sharp bends / crimps, or other signs of damage / wear. If any damage exists, consider contacting your local DHOLLANDIA dealer to acquire new controls. Damage to the controls can be verified by following the flow diagrams in section 7 on page 20.
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Page 32: Platform Does Not Lift
After maintenance, the seal for the pump can become dislodged. This causes hydraulic fluid to only circulate in the reservoir and not build pressure. o If aeration of the fluid in the reservoir occurs, please contact your local DHOLLANDIA dealer. See page 4. •... -
Page 33: Liftgate Does Not Lift The Rated Capacity
Ensure cylinders are not obstructed from moving properly. HYDRAULIC • Check the operating pressures of the liftgate. o If you are not outfitted with DHOLLANDIA’s pressure gauge (part K0106). Please email Parts.US@dhollandia.com to place an order or to find a local distributor o The maximum pressure the liftgate is set at from the factory is listed on your order paperwork. -
Page 34: Platform Does Not Lower
WARNING • Removing or testing the solenoid valves causes the platform to fall and / or open rapidly. • Ensure the platform is either on the ground, or properly secured from falling before proceeding with removing the solenoid valves. DHOLLANDIA... -
Page 35: Platform Drifts Down
Using a small implement, verify the valve plungers can be depressed and that it moves freely back and forth, o Contamination in these valves may allow fluid to bypass and cause the platform to drift down. • If the liftgate continues to drift down, please contact your local DHOLLANDIA dealer. See contact information on page 4. DHOLLANDIA... -
Page 36: Platform Pitch Adjustments
Falling cargo will put the operator and any bystanders at serious risk of bodily injury and death. • Therefore, it is important that the pitch of the flip-over point and complete platform are adjusted correctly conform with instructions in this manual. DHOLLANDIA... - Page 37 • If needed, adjust the angle between the main platform deck and flip-over sections by adjusting the pitch bolts (pictured below). Make sure both sides are adjusted equally, so that the load is supported equally. DHOLLANDIA...
- Page 38 Falling cargo will put the operator and any bystanders at serious risk of bodily injury and death. • Therefore, it is important that the pitch of the flip-over point and complete platform are adjusted correctly conform with instructions in this manual. DHOLLANDIA...
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Page 39: Platform Is Difficult To Fold / Unfold
Therefore, it is important that you adjust the platform opener so that the platform stands just inside from vertical position when lowered to the ground, and the operator can unfold the platform sections comfortably. • If the platform opener assembly was dismounted during installation or moved, make sure all bolts are fastened with the prescribed torque. DHOLLANDIA... - Page 40 Therefore, it is important that you adjust the platform opener so that the platform stands just inside from vertical position when lowered to the ground, and the operator can unfold the platform sections comfortably. • If the platform opener assembly was dismounted during installation or moved, make sure all bolts are fastened with the prescribed torque. DHOLLANDIA...
- Page 41 / servicing may result in serious injury of the operator or service personnel. • Therefore, the tension in the bar should only be adjusted by someone who has been specifically trained to do so. It is NOT a user serviceable part. DHOLLANDIA...
- Page 42 / servicing may result in serious injury of the operator or service personnel. • Therefore, the tension in the bar should only be adjusted by someone who has been specifically trained to do so. It is NOT a user serviceable part. DHOLLANDIA...
- Page 43 / servicing may result in serious injury of the operator or service personnel. • Therefore, the tension in the bar should only be adjusted by someone who has been specifically trained to do so. It is NOT a user serviceable part. DHOLLANDIA...
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Page 44: Rm* Does Not Auto-Tilt At Ground Level
If the liftgate was initially mounted too high off the ground, the mechanical auto tilt function at ground level may not have sufficient enough travel left in the cylinders to properly deploy. • Contact your local DHOLLANDIA dealer if this happens. See contact info on page 4. DHOLLANDIA... -
Page 45: Appendix
WARNING signs MANDATORY ACTION signs Overview and keep visual control over the working Contact your regional DHOLLANDIA distributor. area of the hydraulic ramp at all times. General warning sign used to alert the user to potential hazards. All messages that follow Consult the DHOLLANDIA website. - Page 46 / or cabin Switch between external and internal controls. switch. This is an operation to be executed manually (as opposed to an electrical function controlled by means of one of the control units). DHOLLANDIA...
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Page 47: Prescribed Torque Values For Bolts And Nuts
A fall of the liftgate off the chassis can damage the liftgate and / or vehicle chassis and can cause serious bodily injury or death to the operator and any bystanders. • Therefore, it is essential that the mounting plates are installed following the instructions of this manual. DHOLLANDIA... -
Page 48: Electric And Hydraulic Requirements
• The applicable wiring diagrams are saved at the inside of the main external control box, and can be found there for reference. • A copy of the wiring diagrams can also be obtained from the national DHOLLANDIA distributor [see contact info on page 4];... - Page 49 It is important to follow these guidelines with due care. A lot of oils or fluids used in automotive industry, such as transmission fluids and ATF oils, are not suitable for liftgate use. DHOLLANDIA has not tested the potential consequences of oils and fluids with deviating specifications and cannot be held responsible or legally liable for any damage to the liftgate caused by the replenishment with non-compatible oils or fluids;...
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Page 50: End Note
END NOTE • DHOLLANDIA would like to thank you for using our products and leave you with this final notice and warning. • Additional information about this liftgate and many other DHOLLANDIA products is available at the following link: http://www.dhollandia.com/ NOTICE •...
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