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DH-VO* K1/K2/K9
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 DHVO_US EN_2023 Rev: 0 Date: APRIL 10, 2023
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Table of Contents
Related Manuals for Dhollandia DH-VO K1 Series
Summary of Contents for Dhollandia DH-VO K1 Series
- Page 1 DH-VO* K1/K2/K9 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
Oil Inspection ..................................35 Testing solenoid valves ................................36 Motor fails to run..................................38 Platform does not lift ................................40 Liftgate does not lift the rated capacity ............................ 41 Platform does not lower ................................42 Platform drifts down ................................. 43 DHOLLANDIA... - Page 3 Platform jammed against stow lock (travel position) ....................... 50 APPENDIX ....................................... 51 Meaning of the safety and warning signs ..........................51 Prescribed torque values for bolts and nuts ..........................53 Electric and hydraulic requirements ............................54 End note ....................................56 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 51 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 the lift frame / columns On the 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 Main controls: mounted in a fixed position at the side of the vehicle or under the body. It contains the electrical switches to OPEN / LOWER / LIFT / CLOSE the platform. 16 Extra controls: auxiliary controls besides the main controls that allow full or partial functions. DHOLLANDIA... - Page 9 General representation of multiple VO* types DHOLLANDIA...
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Page 10: Power Pack
10 Power pack bracket: mounted to the passenger side of the chassis to affix the power pack to the vehicle. 11 Motor solenoid: solenoid responsible for starting the electric motor. 12 Solenoid valve(s): electrically actuated valve that allows hydraulic fluid to flow when activated. 13 Connection block: main junction for connecting the controls of the liftgate. DHOLLANDIA... - Page 11 VOU* / VOM* / VOH* / POWER PACKS VODH* POWER PACKS DHOLLANDIA...
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Page 12: Electrical Basics And Controls
6 ELECTRICAL BASICS AND CONTROLS • This chapter explains the electrical basics of DHOLLANDIA DH-VO* 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 13: Vou-16.K1 / Vou-16.K2K9 - Electrical Cheat Sheet
Energizes the solenoid valve located inside the power pack that switches between LIFT / LOWER / OPEN / CLOSE Energizes the solenoid valve located inside the power pack that allows fluid to the TILT cylinder hoses Main 12V source from vehicle batteries to power controls and components Ground DHOLLANDIA... -
Page 14: Schematics
SCHEMATICS • The primary controls for the DH-VO* series liftgates are shown wired in default configuration below: 6.2.1 VOU-16.K1 – Manual Closure DHOLLANDIA... -
Page 15: Vou-16.K2K9 - Manual Closure
6.2.2 VOU-16.K2K9 – Manual Closure DHOLLANDIA... -
Page 16: Vom-22 / 33 & Voh-33 / 44 - Hydraulic Closure
6.2.3 VOM-22 / 33 & VOH-33 / 44 – Hydraulic Closure DHOLLANDIA... -
Page 17: Vodh-33 / 44 - Hydraulic Closure
6.2.4 VODH-33 / 44 – Hydraulic Closure DHOLLANDIA... -
Page 18: Extra Controls
EXTRA CONTROLS • Some of the popular extra controls for the DH-VO* series liftgates are shown wired in the configuration below: 6.3.1 VOU-16.K1 / K2K9 – 2 Button Wander Controls - OAE001 – E0787.2.E DHOLLANDIA... -
Page 19: Vom-22 / 33 & Voh-33 / 44 - 3 Button Wander Lead - Oae002 - E0787.3.M
6.3.2 VOM-22 / 33 & VOH-33 / 44 – 3 Button Wander Lead - OAE002 – E0787.3.M DHOLLANDIA... -
Page 20: Vodh-33 / 44 - Toggle 4 Function - Oae017.Pr - E0834
6.3.3 VODH-33 / 44 – Toggle 4 Function - OAE017.PR – E0834 DHOLLANDIA... -
Page 21: Cabin Switch - Oae510.15 - E0393.S.15
CABIN SWITCH - OAE510.15 – E0393.S.15 • The cabin switch controls for the DH-VO* series liftgates is shown wired in the configuration below: DHOLLANDIA... -
Page 22: Flow Diagrams
7 FLOW DIAGRAMS • This chapter outlines flow diagrams for DHOLLANDIA DH-VO* 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 23: Vou-16.K1 - Manual Closure
VOU-16.K1 – MANUAL CLOSURE • LIFT function activated: DHOLLANDIA... - Page 24 • LOWER function activated: DHOLLANDIA...
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Page 25: Vou-16.K2K9 - Manual Closure
VOU-16.K2K9 – MANUAL CLOSURE • LIFT function activated: DHOLLANDIA... - Page 26 • LOWER function activated: DHOLLANDIA...
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Page 27: Vom-33 / 44 & Voh-33 / 44 - Hydraulic Closure
VOM-33 / 44 & VOH-33 / 44 – HYDRAULIC CLOSURE • LIFT function activated: DHOLLANDIA... - Page 28 • LOWER function activated: DHOLLANDIA...
- Page 29 • OPEN function activated: DHOLLANDIA...
- Page 30 • CLOSE function activated: DHOLLANDIA...
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Page 31: Vodh-33 / 44 - Hydraulic Closure
VODH-33 / 44 – HYDRAULIC CLOSURE • LIFT function activated: DHOLLANDIA... - Page 32 • LOWER function activated: DHOLLANDIA...
- Page 33 • OPEN function activated: DHOLLANDIA...
- Page 34 • CLOSE function activated: DHOLLANDIA...
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Page 35: Troubleshooting
8 TROUBLESHOOTING • This chapter outlines the most common issues encountered with DHOLLANDIA DH-VO* 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 36: Checking Oil
1” below the maximum level. • Please see appendix 9.3 on page 54 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 37: 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 38 This will manually actuate the pin within the valve and temporarily allow hydraulic fluid to bypass the valve. • See the following chapters for how these manual activation methods can be used for troubleshooting. DHOLLANDIA...
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Page 39: 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 40 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 21.
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Page 41: 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 42: Liftgate Does Not Lift The Rated Capacity
Using a small implement, verify the valve plunger can be depressed and that it moves freely back and forth. 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 43: 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 44: 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 45: Platform Does Not Open / Close
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. • Please contact Dhollandia for further advice if platform fold / unfold adjustment is required. See contact info on page 4. DHOLLANDIA... -
Page 46: Hydraulic Open / Close Platforms - Ovh004
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 testing or removing the solenoid valves. DHOLLANDIA... -
Page 47: Platform Is Not Level
If one chain has more slack than the other, the tension can pulleys. be set via the chain forks inside the cylinder beam. • If adjusted, tighten bolts to the proper torques as outlined in 9.2 on page 53. DHOLLANDIA... - Page 48 Examples of locations to find platform pitch adjustment bolts (platform in the CLOSED position). • Ensure both sides of the platform are adjusted equally. • Fasten these bolts to the proper torques as outlined in 9.2 on page 53. DHOLLANDIA...
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Page 49: Platform Moves Abnormally
Check that the chain has not been modified, and that both chains are of equal length. • Check lift columns and slide pads. Visually verify the columns and slide pads do not have bends, cracks, gouges, or uneven surfaces. DHOLLANDIA... - Page 50 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 testing or removing the solenoid valves. DHOLLANDIA...
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Page 51: Platform Jammed Against Stow Lock (Travel Position)
The platform may also need to be forcibly pulled OPEN, while operating the OPEN function on the primary controls OR in the case of manual OPEN / CLOSE platforms, with the platform lock manually bypassed or disengaged. • The operation decals present with the liftgate provide adequate instruction on how to avoid this condition: EF0590.EN EF0592.EN DHOLLANDIA... -
Page 52: 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 53 / 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 54: 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 55: 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 56 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 57: 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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