Dhollandia DH-R Technical Manual
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Dhollandia DH-R Technical Manual

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DH-R*
TECHNICAL GUIDE
Manufacturer:
DHOLLANDIA US, L.L.C.
E-mail : us.info@dhollandia.com
270 Southridge Parkway
Bessemer City North Carolina, 28016
website : www.dhollandia.com
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
Order ref: xxx Doc: TECH_US technical guide DHR_US EN_2021 Rev: 0 Date: SEPTEMBER 23, 2021

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  • Page 1 DH-R* TECHNICAL GUIDE Manufacturer: DHOLLANDIA US, L.L.C. E-mail : us.info@dhollandia.com 270 Southridge Parkway Bessemer City North Carolina, 28016 website : www.dhollandia.com 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...

  • Page 2: Table Of Contents

    Prescribed torque values for bolts and nuts ..........................35 Electric and hydraulic requirements ............................36 Connections to the main external control box type 1 ....................... 38 End note ....................................42 Basic wiring diagrams ................................42 Checklist for preventative maintenance and repair ......................... 42 DHOLLANDIA...

  • Page 3: 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 33 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 4: Introduction 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 5: Safety Precautions For Operation

    DHOLLANDIA liftgates are developed and manufactured using state-of-the-art technology, high quality materials and components and highly skilled workmanship. • The DH-R… series comprises of a range of fold-away liftgates, designed for a wide variety of trucks, trailers and semi-trailers, and is available with lift capacities ranging from 2,200 to 5,500 lbs. •...

  • Page 6: Liftgate

    The construction with support channels and diagonal braces aims to distribute the forces of a dock impact over the rear sill and support cross members of the vehicle body and avoid damage as much as possible. DHOLLANDIA...
  • Page 7 DHOLLANDIA...

  • Page 8: Power Pack

    Hydraulic pump: coupled to the electric motor. Pumps fluid from the reservoir into the logic block. (This component is located inside the reservoir). S4 Switching valve: logic block for power down functionality (NOT PRESENT ON GRAVITY DOWN LIFTGATES). Power down valve: responsible for switching the direction of hydraulic fluid to enable power down functionality. DHOLLANDIA...
  • Page 9 DHOLLANDIA...
  • Page 10 NOTICE • Items 12 and 13 are NOT present on gravity down models, only power down. • Items marked with red squares are responsible for LIFT, items with blue diamonds are responsible for LOWER. DHOLLANDIA...

  • Page 11: Electrical Basics And Controls

    Similarly, the two horizontal (pink) rows at the top of the connection block all act as GROUND and tie into the “-“ negative stud on the electric motor. • The table below shows the typical functionality of this block for DHOLLANDIA DH-R* series liftgates: Function Activates the motor relay, which in turn powers the electric motor.

  • Page 12: Main Control (Oae015.Pr - E0832.B)

    MAIN CONTROL (OAE015.PR – E0832.B) • The primary control for the DH-R* series liftgates is shown wired in default configuration below: DHOLLANDIA...

  • Page 13: Extra Control (Oae001 - E0783.H.s)

    EXTRA CONTROL (OAE001 – E0783.H.S) • The most popular secondary control for the DH-R* series liftgates is shown wired in the configuration below: DHOLLANDIA...

  • Page 14: New Series Cabin Switch (Oae510.15 - E0393.S.15)

    NEW SERIES CABIN SWITCH (OAE510.15 – E0393.S.15) • The newer generation cabin switch control for the DH-R* series liftgates is shown wired in the configuration below: DHOLLANDIA...

  • Page 15: Cabin Switch (Oae503.1 - E0667.12)

    CABIN SWITCH (OAE503.1 – E0667.12) • The older generation cabin switch control for the DH-R* series liftgates is shown wired in the configuration below: DHOLLANDIA...

  • Page 16: Schematics

    6 SCHEMATICS • This chapter will outline both power down and gravity down schematics for DHOLLANDIA DH-R* series liftgates. • For the sake of simplicity, only the primary control (OAE015.PR / E0832.B) will be shown. • To troubleshoot other configurations, please refer to the previous chapters, or see contact information on page LINK.

  • Page 17: Power Down Schematics

    POWER DOWN SCHEMATICS • This schematic shows a power down unit at rest: DHOLLANDIA...
  • Page 18 • This schematic shows a power down unit with the LIFT function activated: DHOLLANDIA...
  • Page 19 • This schematic shows a power down unit with the LOWER function activated: DHOLLANDIA...

  • Page 20: Gravity Down Schematics

    GRAVITY DOWN SCHEMATICS • This schematic shows a gravity down unit at rest: DHOLLANDIA...
  • Page 21 • This schematic shows a gravity down unit with the LIFT function activated: DHOLLANDIA...
  • Page 22 • This schematic shows a gravity down unit with the LOWER function activated: DHOLLANDIA...

  • Page 23: Troubleshooting

    7 TROUBLESHOOTING • This chapter will outline 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 24: Checking Oil

    • Please see appendix 9.3 on page 36 for the main types of oil used by DHOLLANDIA. NOTICE • DHOLLANDIA US recommends using AW-32 oil.

  • Page 25: 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 32.
  • Page 26 Check the primary toggle switch harness for shorts, sharp bends / crimps, or other signs of damage / wear. If any damage exists, consider contacting your local DHOLLANDIA dealer to acquire a new toggle switch. Damage to the primary toggle switch can be verified by following the flow schematics given in section 6 on page 15.

  • Page 27: Liftgate Will Not Lift

    Visual verification of this is generally adequate for diagnosis. o If aeration of the fluid in the reservoir occurs, please contact your local DHOLLANDIA dealer. See page 32. 4. Check for voltage (12V nominal) on row “H” of the connection block.

  • Page 28: Liftgate Will Not Lift The Rated Capacity

    3. Check the operating pressures of the liftgate. o If you are not outfitted with DHOLLANDIA’s pressure gauge (part K0106), please contact your local DHOLLANDIA dealer for a quote. See page 32. o The maximum pressure the liftgate is set at from the factory will be listed on your order paperwork.

  • Page 29: Liftgate Will Not Lower

    6. Finally, inspect and clean out the safety valves. WARNING • Removing the safety valve on the lift cylinder(s) will cause the platform to fall rapidly. • Ensure the platform is either on the ground, or properly secured from falling before proceeding with removing the safety valves. DHOLLANDIA...

  • Page 30: Liftgate Drifts Down

    3. Inspect and clean out the safety valves at the base of the lift cylinder(s). o Contamination in these valves may allow fluid to bypass and cause the platform to drift down. 4. If the liftgate continues to drift down, please contact your local DHOLLANDIA dealer. See contact information on page 32. DHOLLANDIA...

  • Page 31: General Platform Issues

    2. Platform will not auto-tilt to meet the ground (ONLY RMM* / RMH* (RM.20 / RM.25) SERIES GATES): o Check to see if the auto-tilt bolts have been removed post-installation. o These bolts keep the swing brackets for auto-tilt in place during installation and should be removed afterwards. DHOLLANDIA...
  • Page 32 Platform is leaning too far in. Platform is leaning too far out. platform in comfortable way. Operator could suffer back Platform could fall open injury when pulling open unexpectedly and hit the limbs of platform from this position. the operator or bystanders. DHOLLANDIA...

  • Page 33: Contact Information

    8 CONTACT INFORMATION • Before contacting a DHOLLANDIA location, please be sure to have the serial number of the liftgate in question on hand. • For help finding your serial number, please see the images below for common locations of serial number decals on the liftgate:...

  • Page 34: Appendix

    MEANING OF THE SAFETY AND WARNING SIGNS WARNING signs MANDATORY ACTION signs Overview and keep visual control over the Contact your regional DHOLLANDIA distributor. working area of the hydraulic ramp at all times. General warning sign used to alert the user to Consult the DHOLLANDIA website.
  • Page 35 / or Switch between external and internal controls. cabin 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...

  • Page 36: 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 37: 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 32];...
  • Page 38 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;...

  • Page 39: Connections To The Main External Control Box Type 1

    Reserve the wider for the ticker channels. supplied with the liftgate. battery & ground cables. Use the narrower Route the cable in such a way that it cannot for control units, cables of electro valves be damaged or pinched. etc. DHOLLANDIA...
  • Page 40 DC motor by means of a hexagonal key nr. assigned channels. Push them down into key nr. 13. the groove, make sure the cables don’t overlap the vertical divider lips between the various channels. DHOLLANDIA...
  • Page 41 Allen Key nr. 5. At the inside, route all cables so that they Use cable ties to bind the cables together, are protected against damage, pinching protect cables against vibration, and finish and chafing. off in a clean way. DHOLLANDIA...
  • Page 42 Insufficient torqueing of the connection bolts can cause overheating and short circuits. Improper sealing can cause water ingress, and premature corrosion to the battery cable connection. • DHOLLANDIA disclaims liability for any personal injury or property damage that results from improper or negligent installation. DHOLLANDIA...

  • Page 43: 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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