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Dhollandia DH-R User Manual

Dhollandia DH-R
43 pages
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Order ref: xxx Doc: TECH_US technical guide DHR_US EN_2021 Rev: 0 Date: SEPTEMBER 23, 2021
DH-R*
TECHNICAL GUIDE
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 : us.info@dhollandia.com
270 Southridge Parkway
Bessemer City North Carolina, 28016
website : www.dhollandia.com
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Dhollandia DH-R Specifications

General IconGeneral
BrandDhollandia
ModelDH-R
CategoryLifting Systems
LanguageEnglish

Summary

1 UNDERSTANDING SAFETY AND WARNING SIGNS

DANGER

Indicates an imminently hazardous situation.

WARNING

Indicates a potentially hazardous situation.

CAUTION

Indicates a potentially hazardous situation.

NOTICE

Used for practices not related to physical injury.

SAFETY INSTRUCTIONS

General instructions for safe work practices.

SAFETY ALERT SYMBOL

Alerts user to potential hazards.

2 INTRODUCTION AND DISCLAIMERS

WARNING

Improper installation can cause damage and injury.

NOTICE

Confirm latest manual version and installer responsibility.

DISCLAIMERS

Manufacturer liability disclaimers for modifications, misuse, or installation.

3 SAFETY PRECAUTIONS FOR OPERATION

WARNING

Improper use poses risks of serious injury or death.

4 LIFTGATE TERMINOLOGY

Liftgate

Describes the DH-R* series fold-away liftgates.

Power pack

Refers to the hydraulic pump unit and controls.

Lift frame

Mounted under chassis, supports platform via arms/cylinders.

Mounting plates

Used to mount lift frame to vehicle chassis.

Foldable platform

Carries load during operation, consists of main section and flip-over.

Platform main section

Inboard section of foldable platform.

Flip-over point

Outboard, foldable section of the platform.

Lift arms L+R

Actuated by cylinders to LIFT/LOWER platform.

Lift cylinders L+R

Hydraulic cylinders to LIFT/LOWER arms and platform.

Parallel arms L+R

Support platform during travel.

Hydraulic pump unit

Contains motor, pump, oil tank, control valves.

Toggle-switch control

Easy-to-use controls for LIFT/LOWER.

Bumper bar

Under run protection device.

Center point of maximum load

Point up to which rated capacity is valid.

Platform opener

Arm assisting platform deployment.

Extension plate

Steel extension mounted to rear sill of vehicle floor.

Side steps L + R

Steps to help driver climb into vehicle from side.

Dock bumpers

Rubber buffers on side steps to reduce impact damage.

Support channels

Steel channels welded under vehicle body.

Diagonal braces

Steel profiles linking side steps to support channels.

4.2 POWER PACK

POWER PACK TERMINOLOGY

Definitions of power pack components and their functions.

Connection block

Main junction for connecting controls.

Motor relay

Solenoid for starting electric motor.

Electric motor

Drives the hydraulic pump.

Thermal contact

Protects motor from overheating.

Logic block

Manifold directing hydraulic flow.

Flow restrictor

Restricts hydraulic flow to reservoir.

Pressure gauge port

Port for connecting pressure gauge.

Pressure check valve

Maintains safe hydraulic pressure.

Reservoir

Contains hydraulic fluid.

Switching plunger

Valve in logic block.

Hydraulic pump

Pumps fluid from reservoir.

S4 Switching valve

Logic block for power down.

Power down valve

Switches hydraulic fluid for power down.

5 ELECTRICAL BASICS AND CONTROLS

E2051 CONNECTION BLOCK

Explains the E2051 connection block layout and function.

5.2 MAIN CONTROL (OAE015.PR – E0832.B)

5.3 EXTRA CONTROL (OAE001 – E0783.H.S)

5.4 NEW SERIES CABIN SWITCH (OAE510.15 – E0393.S.15)

5.5 CABIN SWITCH (OAE503.1 – E0667.12)

6 SCHEMATICS

GENERAL SCHEMATIC SYMBOLS AND LEGEND

Outlines schematic symbols and parts for understanding diagrams.

6.2 POWER DOWN SCHEMATICS

Unit at rest

Schematic of a power down unit when not in operation.

LIFT function activated

Schematic showing LIFT function activated.

LOWER function activated

Schematic showing LOWER function activated.

6.3 GRAVITY DOWN SCHEMATICS

Unit at rest

Schematic of a gravity down unit when not in operation.

LIFT function activated

Schematic showing LIFT function activated.

LOWER function activated

Schematic showing LOWER function activated.

7 TROUBLESHOOTING

CHECKING BATTERIES

Procedure for measuring battery voltages and testing.

7.2 CHECKING OIL

7.3 MOTOR FAILS TO RUN

Check the motor relay

Testing the functionality of the motor relay.

Check the motor ground post

Verifying the motor's ground connection.

Check main control switch voltages

Verifying voltages at the primary toggle switch.

7.4 LIFTGATE WILL NOT LIFT

7.5 LIFTGATE WILL NOT LIFT THE RATED CAPACITY

7.6 LIFTGATE WILL NOT LOWER

7.7 LIFTGATE DRIFTS DOWN

7.8 GENERAL PLATFORM ISSUES

Platform is not level

Verifying and adjusting platform leveling.

Platform will not auto-tilt to meet the ground

Troubleshooting auto-tilt issues.

Platform is difficult to fold / unfold from stowed position

Adjusting platform folding/unfolding issues.

8 CONTACT INFORMATION

9 APPENDIX

MEANING OF THE SAFETY AND WARNING SIGNS

Explains various safety, mandatory, and prohibition signs.

OTHER frequently used signs

Explains common signs for procedures and functions.

Signs for the electric / hydraulic functions

Explains signs related to liftgate operations.

9.2 PRESCRIBED TORQUE VALUES FOR BOLTS AND NUTS

9.3 ELECTRIC AND HYDRAULIC REQUIREMENTS

Recommended cable sections

Recommended cable sections for battery and ground cables.

Batteries and charging system requirements

Minimum requirements for batteries and charging systems.

Hydraulic oil types

Details the types of oils used in hydraulic systems.

9.4 CONNECTIONS TO THE MAIN EXTERNAL CONTROL BOX TYPE 1

Instructions for running cables through the entry seal

Instructions for running cables through the entry seal.

Connecting battery and ground cables

Steps for connecting battery and ground cables.

Arranging cables in channels

How to arrange cables for protection and neatness.

Reassembly of the entry seal

Steps for reassembling the multi-cable entry seal.

Securing cables with ties

Using cable ties to secure cables.

9.6 END NOTE

9.7 BASIC WIRING DIAGRAMS

9.8 CHECKLIST FOR PREVENTATIVE MAINTENANCE AND REPAIR

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