Dhollandia DH-L Series Operating instructions

DHOLLANDIA
Doc : serv-DHL-EUR EN-2019-01 Rev: 0Date: JUNE 04, 2019
DH-L* cantilever tail lifts
MAINTENANCE & REPAIR MANUAL
Manufacturer:
DHOLLANDIA N V Zoomstraat 9 9160 LOKEREN (Belgium)
Tel : [phone] Fax : [phone]
e-mail : info@dhollandia be
website : www dhollandia com
Read the manual in its entirety before servicing or repairing the tail lift
Keep this manual in the vehicle cabin, as reference for the tail lift operator and technical personnel
edition

DHOLLANDIA 2
Sect § Title Page
1 Understanding safety and warning signs 4
2 Contact information and disclaimers 5
3 Safety instructions for maintenance and repair 6
4 Identification & ordering replacement parts 7
5 ail lift terminology 8
6 Maintenance 9
7 Lubrication and grease plans 14
8 Electric and hydraulic diagrams 15
§8.1 General 15
§8.2 ail lift terminology : electric DC motor and starter solenoid 16
§8.3 ail lift terminology : pump unit of DH-LM.10, DH-LM.15, DH-LM.20 17
§8.4 ail lift terminology : pump unit of DH-LM.20, DH-LM.30 18
§8.5 ail lift terminology : pump unit, hydraulic pipes and cylinders 19
9 roubleshooting and repair 20
§9.1 Introduction 20
§9.2 ail lift moves at normal speed, whilst operator doesn’t operate any switch or button 21
§9.3 ail lift doesn’t move al all, whilst operator tries to operate external control box or auxiliary control 22
§9.4 Symptoms of weak batteries or damaged current supply 23
§9.5 he DC motor doesn’t run, but the downward functions OPEN/LOWER work ok 25
§9.6 he DC motor doesn’t switch off 26
§9.7 he platform doesn’t LOWER, the other functions work ok (for DH-LM + MECH-X wiring system) 27
§9.8 he platform doesn’t OPEN, the other functions work ok (for DH-LM + MECH-X wiring system) 28
§9.9 he tail lift doesn’t reach its max. rated lift capacity (for DH-LM + MECH.X wiring system) 29
§9.10 he tail lift doesn’t reach vehicle floor level 30
§9.11 he platform LOWERS only very slowly, when function LOWER is activated 31
§9.12 he platform LOWERS shock-wise, when function LOWER is activated 32
§9.13 he platform OPENS very slowly, when function OPEN is activated 33
§9.14 he platform LIF S and CLOSES simultaneously, when function LIF is activated 34
§9.15 he platform drifts down slowly, although the operator doesn’t push any button (for DH-LM + MECH-X
wiring system)
35
§9.16 he platform drifts open slowly, although the operator doesn’t push any button (for DH-LM + MECH-X
wiring system)
36
10 Emergency operation 37
§10.1 Introduction and safety instructions 37
§10.2 Procedure I-SERV-G-001 : manual operation of the SINGLE AC ING valves 38
§10.3 Procedure I-SERV-G-002 : manual operation of the DOUBLE AC ING valves (2 types) 39
11 Other important techniques 40
§11.1 Procedure I-SERV-G-003 : hydraulic pressure reading and adjustment 40
§11.2 Procedure I-SERV-G-004 : flushing of pressure relief valve 41
§11.3 Procedure I-SERV-G-005 : check on valve and solenoid function 43
§11.4 Procedure I-SERV-G-006 : flushing and cleaning of valve cartridge 44
... ...
TABLE OF CONTENTS

DHOLLANDIA 3
§11.5 Procedure I-SERV-G-007 : testing internal cylinder leaks 45
§11.6 Procedure I-SERV-G-008 : oil replacement, filling and bleeding 46
12 Decals 47
13 Prescribed torque values for bolts supplied with tail lift 50
14 Meaning of safety and warning signs 51
- Annexes 53...

DHOLLANDIA 4
1 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 section 14 for an overview of signs and symbols used in DHOLLANDIA manuals, and their meaning.
• Please take special notice of the following signs used in the manual. hey indicate the likelihood and severity of a potential
injury if a person fails to follow the instructions presented on the safety sign.
NOTICE
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
INSTRUCTIONS
SAFETY ALERT SYMBOL (freestanding, or on background colors red, orange, yellow or black) : is
used to alert the user to potential hazards. All safety messages that accompany this sign shall be
obeyed to avoid possible harm.
• Failure to understand and to follow the instructions in this manual can put the technician working on the tail lift, the operator
and any bystanders at great risk of serious bodily injury and death.
• Prior to operating the tail lift, 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 NO operate the tail lift. Contact your national DHOLLANDIA distributor. See page 3 for contact info.

DHOLLANDIA 5
2 CONTACT INFORMATION AND DISCLAIMERS
• DHOLLANDIA tail lifts are regularly being adapted to new vehicle and chassis developments, and specialized customer
requirements. herefore DHOLLANDIA reserves the right to alter product specifications without prior notice; and potentially
modifications or new developments might not have been taken into account at the time of printing.
• Contact your national DHOLLANDIA distributor if you have any questions regarding the installation, operation, repair and
maintenance of DHOLLANDIA tail lifts, to obtain replacement copies of manuals or decals, or to learn about available
equipment options for DHOLLANDIA tail lifts.
NOTICE
Please confirm you have reviewed the most up-to-date version of this manual prior to carrying out maintenance or repair work.
See below for instructions to download the latest version of the manual.
DISCLAIMERS
• DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from operating a tail lift that
has been modified from the original design, without explicit written approval from the manufacturer.
• DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from operating a tail lift that
has not been serviced or repaired according to the instructions in the MAINTENANCE & REPAIR MANUAL.
• DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from use of aftermarket or
non-OEM replacement parts for service or repair of the tail lift.
• DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from improper use of the
tail lift.
• DHOLLANDIA disclaims liability for any personal injury, death, or property damage that results from overloading or
improperly loading the platform, disregard of the maximum rated lift capacity and the applicable load charts.
• here 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 the OPERA ION MANUAL.
• ake notice of the following important disclaimers:
he latest version of all manuals can also be downloaded from the DHOLLANDIA website
www dhollandia com → Downloads → User’s manuals → … select required manual
If in doubt where to find your national DHOLLANDIA distributor, visit the official DHOLLANDIA website
www dhollandia com → Country selection / language selection → Distributors & service

DHOLLANDIA 6
3 SAFETY INSTRUCTIONS FOR MAINTENANCE AND REPAIR
• he health & safety instructions for installation, repair and maintenance are
regularly updated and enhanced, and therefore managed and presented in a
separate manual.
• Contact the national DHOLLANDIA distributor for the most recent
edition, or download it from the website:
www.dhollandia.com  your language  Downloads
 User’s manuals  General information
• In order to ensure the safety of the technicians performing installation, repair or maintenance work on tail lifts, it is essential
that they follow the instructions and precautions of the GENERAL SAFE Y INS RUC IONS FOR REPAIR AND
MAIN ENANCE at all times.
• Make sure you wear safe work clothes, and take safety precautions as described in these instructions at all times.
• Additionally, when dismounting parts of the hydraulic circuit, make sure you take maximum precautions to avoid oil spillage
and protect the environment, as described in these instructions.
• In order to ensure the safety of the technical personnel, of the tail lift operators, and of any bystanders, installation,
maintenance and repair work should only be performed by skilled and authorised technicians. hese technicians must have
been duly and professionally trained; must know and understand the content of the operation manual and the relevant
installation, repair and maintenance manuals; and must master the safety aspects involved in their job.
• Negligence can put the technical personnel, the operator and third parties at great risk, and could result in severe personal
injury or death. Negligence can also cause premature wear or damage to the tail lift.
• In case of doubt, contact the national DHOLLANDIA distributor for further help and instructions.

DHOLLANDIA 7
• 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.
• he following information must be confirmed when ordering replacement parts:
→ ype, year of construction & serial number of the tail lift
→ Replacement part number [consult the replacement parts lists]
→ he desired quantity of each item
→ Your administrative data: company name, invoice address + resale number, purchase order number, delivery address, to
whose attention and expected delivery time.
• Replacement parts lists can be obtained from your local DHOLLANDIA distributor, or can be downloaded from:.
www.dhollandia.com  your language  Downloads  Replacement parts lists (2005-…)  ...
4 IDENTIFICATION & ORDERING REPLACEMENT PARTS
On the lift frame On the hydraulic cylinders
In the pump unit On the platform
On the main external control box
• Every DHOLLANDIA tail lift is identified by and labelled
with a unique 8-digit serial number (with or without a
space between the first and last 4 digits). Use this
number for any inquiry on a particular tail lift, or when
ordering replacement parts.
• In addition to the tail lift type and serial number, the
various serial number labels provide additional
information, such as: the maximum rated lift capacity and
load chart, the bumper certification number, the date of
manufacture, etc...
• hese labels are usually affixed to the vehicle body and
various tail lift components, and can be found in following
locations (the yellow arrows point to the serial numbers):
EXAMPLE
Affixed to the side of the vehicle body, or on the platform

DHOLLANDIA 8
5 TAIL LIFT TERMINOLOGY
1
2
2
3
4
5
6
7
7
9
9 8
TAIL LIFT TERMINOLOGY
# Description
1 Lift frame: mounted in a fixed position under the vehicle chassis. It bears the platform and its load via connection to the
lift arms and hydraulic cylinders.
2 Mounting plates: used to mount the lift frame to the vehicle chassis.
3 Platform: carries the load during loading / unloading, lifting / lowering. Manufactured from steel or lightweight aluminum
with a non-slip working surface. Equipped with synthetic rollers to protect it from scraping the ground.
4 Lift arms L+R: actuated by the hydraulic lift cylinders, used to LIF / LOWER the platform and its load.
5 Lift cylinders L+R: 1 or 2 hydraulic cylinders used to LIF / LOWER the lift arms, the platform and its load.
6 Tilt cylinders L+R: 1 or 2 hydraulic cylinders used to OPEN / CLOSE the platform, or to change its angle when opened
in work position.
7 Hydraulic pump unit: contains the electric motor driving the hydraulic pump, the oil tank, and the control valves.
8 Main external control box: mounted in a fixed position at the side of the vehicle, under the body. Contains the electrical
switches allowing the operator to execute all tail lift functions OPEN - LOWER - LIF - CLOSE.
9 Bumper bar: under run protection device.
10 Center point of maximum load: point up to which the maximum rated capacity of the tail lift is valid. Beyond that point,
the maximum safe working load diminishes according to the applicable load charts found near the external control station
on the side of the vehicle body. See also section 8 in the OPERA ION MANUAL.
See figure below for parts corresponding to numbers in this table
10

DHOLLANDIA 9
6 MAINTENANCE
• Regular maintenance performed by competent technicians, is extremely important, not only to maximize the life expectancy of
the tail lift, but also to help ensure the operational reliability of the tail lift and safety of the operator (and potential bystanders).
NOTICE
• All maintenance and repair work must be performed by skilled and authorized DHOLLANDIA service agents, and using
original DHOLLANDIA replacement parts only.
• he warranty and product liability are only valid for tail lifts which are maintained in good working condition according to the
instructions in this manual.
• he tail lift should work smoothly and quietly through its range of motion. During OPEN and LOWER cycles (*), the tail lift
should operate almost silently. During LIF and CLOSE cycles, only the sound of the running DC motor in the pump unit
should be audible. Any other (creaking, grinding or shrieking) noise should be carefully investigated to avoid damage.
(*) Valid for standard tail lifts equipped with single acting tilt cylinders with internal springs. For tail lifts equipped with the
optional double acting tilt cylinders and POWER OPEN function, the DC motor is also audible while opening the platform.
• he maintenance frequency depends on the frequency and conditions of use. he checklist hereafter uses following letters to
indicate the required maintenance frequency:
90 days = every 90 days or 1750 cycles, whichever occurs first
Yearly = yearly, preferably just before winter
W = after each pressure wash
• Use the checklist hereafter to execute the maintenance or inspection in a systematic way. Make sure you follow the indicated
intervals.
• When checking the correct fastening of bolts and nuts, use a calibrated torque wrench to do so. he prescribed values are
mentioned in the annex of this manual.
• Besides the regular maintenance performed by skilled technicians, DHOLLANDIA strongly recommends that operators
perform daily pre-trip inspections as detailed in the operation manual.
• Some steps in the maintenance check list require special skills and specific knowledge, that can be acquired through the
DHOLLANDIA training programs for maintenance and repair. In case of doubt, DON’ go any further, but ask your local
DHOLLANDIA distributor for professional advice.

DHOLLANDIA
Checklist for preventative maintenance
and inspection of DH-LM
Work order #
Client: …………………..…………………..………………….
Address: ………………………………..….………………….
………………………………………….....……….…………..
City:………………………. ST:……... Zip:...……..……..
Plate: ………………...………..... Mileage: ……….……….....
Model + S/N:…………………………..........................…..…..
Date:…………………………………………………………..….
Conta t phone:………………………………………………….
When “not OK”, liftgate m st be serviced or repaired prior to f rther se !
Client PO #
Before getting started... OK ? Corre ted
Pressure wash
Clean liftgate thoroughly to make it ready for inspection
90 days
Doc mentation check, safety markings and decals OK ? Corre ted
Operation manual
Present in vehicle cab; complete
90 days
Model ID de al, serial number de al, MAXIMUM RATED CAPACITY de al
Present, legible, conspicuous, in good condition
90 days
Marking of CENTER POINT OF MAXIMUM LOAD on platform
Present, legible, conspicuous, in good condition
90 days
Marking of SAFE OPERATOR POSITION on platform (if no foot ontrols)
Present, in good condition, applied per installation manual
90 days
Safety and operation de als
Present, complete, legible, in good condition
90 days
Controls and electrical wiring OK ? Corre ted
Main external ontrol box, over, installation to vehi le body
Condition and integrity, undamaged
90 days
Main battery dis onne t swit h in ontrol box, dashboard swit h in tru k abin
Condition, operation
90 days
Swit hes and buttons, prote tive rubber overs
Condition, operation, automatic return to neutral position
90 days
Wiring harnesses
Condition, secured with clamps and/or cable ties, undamaged
90 days
Inside of main external ontrol box, 15A fuse, plus spare, ele tri al swit hes
Condition, dry, corrosion free, all wires secured
90 days
Mandatory 2-hand operation when using main external ontrol box (if appli able), safety
swit h
Operation, not tampered with or altered in any way
90 days
Safety swit h (if appli able), onne tion of auxiliary ontrols
Operation, correct switching between main external controls and auxiliary controls
90 days
Foot ontrols and their rubber buttons
Condition, operation, routing, securement and condition of the wiring harness
90 days
Handheld remote ontrol
Condition, operation, condition of holder or magnetic catch, spiral cable and plug(s
90 days
SERV-DHL he klist-EUR EN-2019-01 page 1/4

DHOLLANDIA
Electrical installation OK ? Corre ted
Batteries and battery onne tions
Condition, maintenance of battery, charging system output is sufficient, connections are
secure. Apply silicone dielectric grease to all exposed connections.
Yearly
(+) Battery and ables, plugs, terminal onne tions, prote tive looms
Condition, undamaged, secured with clamps and/or cable ties, inspect full length and
connection at both ends of the cable
90 days
Cylinder lo k valve harnesses
Condition, secured with cable ties, undamaged
90 days
Harness(es) from platform to ontrol box or pump unit (foot ontrols, platform lights, et .)
Condition, routing, secured with cable ties, undamaged
90 days
Harnesses for other auxiliary ontrols
Condition, routing, secured with cable ties, undamaged
90 days
Wiring harness between ontrol box and pump unit
Condition, secured with clamps and/or cable ties, undamaged
90 days
Main fuse or ir uit breaker in battery box
Terminals tight, corrosion free, no signs of overheating, verify operation if manual trip
present.
90 days
Conne tions at main external ontrol box
Condition, all connections secured, dry and corrosion free
Yearly
Conne tions in pump unit, ele tri onne tion board
Condition, all connections tight, dry and corrosion free
90 days
Limit swit hes, pressure swit hes, tilt sensors (optional)
Condition, operation, automatic return to the neutral position; tilt sensor works correctly
90 days
(-) Ground ables, plugs, terminal onne tions, prote tive looms
Condition, undamaged, secured with clamps and/or cable ties, inspect full length and
connection at both ends of the cable
90 days
Hydra lic pipes and connections OK ? Corre ted
Hydrauli pipes, flexible and rigid
Condition, routing, no damage, leaks or chafing. Replace flexible pipes every 5 years.
90 days
Hydrauli fittings, O-ring seals
Condition, no leaks
90 days
Hydrauli ir uit general
No visible oil leaks during operation and at rest
90 days
Hydra lic p mp nit OK ? Corre ted
Pump unit box + over, outside + inside
Condition, undamaged, sealed, dry and corrosion free.
90 days
Mounting of pump unit to lift frame or vehi le hassis
Condition and integrity
90 days
Oil reservoir, oil filter
Check oil level, clean filter yearly, replace hydraulic oil every 3 years
Yearly
Bleed hydrauli ir uits
After replacing oil, or after opening hydraulic circuit for any reason
As needed
Motor, starter solenoid, onne tion between both
Condition inside pump unit, operation, all connections are tight, no signs of overheating
90 days
Hydrauli ir uit general external appearan e, valve blo k and solenoid valves
No visible oil leaks during operation and at rest
90 days
SERV-DHL he klist-EUR EN-2019-01 page 2/4

DHOLLANDIA
Hydra lic cylinders OK ? Corre ted
All hydrauli ylinders
Condition, operation, fastening of pivot points and locking bolts
90 days
Piston rods, rubber prote tion boots
Condition; rod surface free of paint, dirt, scratches and pitting
90 days
Cylinder lo k valves
Condition, undamaged, clearance from mounting plates, bumper, other fixed parts
90 days
Tilt ylinders
Correct adjustment of extension rods, fastening of lock nut of extension rod
Yearly
Hydrauli ir uits of ylinders, valves and ouplings
No visible oil leaks in operation and at rest
90 days
Lift frame OK ? Corre ted
Lift frame, lift arms
Condition, undamaged (deformation, cracks in material or welds , no corrosion
90 days
Pivot points, pivot pins and bearings
Condition, no damage or wear, fastening of locking pins / bolts / nuts
Presence and condition of lubrication fittings
90 days
Auto-tilt bra kets between lift arms and lift frame (DH-LM type)
Condition, undamaged (deformation, cracks in material or welds , lubricated
90 days
Mounting plates to hassis
Condition, undamaged (deformation, cracks in material or welds , sufficient bolts per
installation instructions, torqued to specifications (if bolted .
90 days
Pivot points, pivot pins and bearings
Pump grease in all lube fittings
90 days
Platform OK ? Corre ted
Platform onstru tion
Condition, undamaged (deformation, cracks in material or welds , no corrosion
90 days
Pivot points, pivot pins and bearings
Condition, no damage or wear, fastening of locking pins / bolts / nuts
Presence and functional condition of lubrication fittings
90 days
Platform rollers
Condition, undamaged. Replace when worn or damaged
90 days
Cart-stops (optional)
Condition, operation, no debris underneath
90 days
Flashing platform lights, foot ontrols, other ele tri platform options (optional)
Condition, operation of the device. Condition, routing of the harness(es to the control box
or pump unit, undamaged
90 days
Platform flags (optional)
Presence, condition, visibility
90 days
Me hani al platform lo k (optional)
Condition, operation, lubricate mechanism
90 days
Platform at loading floor
Presence and functional condition of stop blocks for lifting movement. Alignment of the
platform flush with the loading floor
Yearly
Pivot points, pivot pins and bearings
Pump grease in all lubrication fittings
90 days
(*) 90 days, 1750 y les or after ea h
pressure wash, whi hever omes first
(*) 90 days, 1750 y les or after ea h
pressure wash, whi hever omes first
SERV-DHL he klist-EUR EN-2019-01 page 3/4

DHOLLANDIA
Practical tests OK ? Corre ted
Fun tional test with empty platform
Perform all movements minimum 3 times with all control units.
Liftgate should operate smoothly and quietly through its full range of motion.
Check condition of pivot points (no excessive play .
Verify correct auto-tilt function at ground level.
90 days
Regular weight test at 100% of MAXIMUM RATED CAPACITY
Rest platform on ground.
Position MAX. LOAD on CENTER POINT FOR MAX. LOAD.
Lift platform. Check if lift capacity is sufficient. Check general operation and stability.
Check safe working speeds:
• Lift and lower: max. 6” / sec
• Open and close: min. 9 sec to open or close platform
Yearly
Overload test, adjustment of pressure relief valve
Rest platform on ground.
Position a load = 1.1 x MAXIMUM LOAD on the CENTER POINT OF MAXIMUM LOAD
Press lift function. Platform should not lift off the ground. Pressure relief valve should
open.
If required, use procedure I-SERV-G-003 to adjust the pressure until platform will NOT lift
1.1 x MAXIMUM LOAD
(Note: pressure should never exceed 220 bar / 3190 psi
Yearly
Hydrauli ir uit general
No visible oil leaks during operation and at rest
90 days
Notes:
Maintenan e or inspe tion performed by:
Servi e Center
Name of te hni ian:
Date of next maintenan e / inspe tion (*):
(*) erase what is not appli able
Make s re yo follow the all instr ctions and safety preca tions at all times. Refer to:
the OPERATION MANUAL
the GENERAL SAFETY INSTRUCTIONS FOR REPAIR AND MAINTENANCE
(available via www.dhollandia.com or contact the local distributor)
SERV-DHL he klist-EUR EN-2019-01 page 4/4

DHOLLANDIA 14
7 LUBRICATION AND GREASE PLANS
NOTICE
• To maximize the durability and operational reliability of the tail lift, it is important to lubricate it regularly, taking
into account the intensity of use
• All DHOLLANDIA tail lifts are equipped with low maintenance bearings. In normal conditions of use during a single shift, tail
lifts should be lubricated every 90 days, or 1750 cycles, whichever occurs first.
• In case of very severe duty (multiple shift, 24h operation,…) or if frequently pressure washed with strong detergents, the
frequency of lubrication should be increased to the specific conditions proportionally. In case of doubt, contact your national
DHOLLANDIA agent.
• Pressure wash the tail lift, before pumping grease in the lube fittings.
• Ensure that all pivot points get a grease collar on both sides of the bearing or articulation, protecting it against ingress of wa-
ter, salt, sand or dirt.
• Ensure all lube fittings function correctly, and replace any defective fittings.
• If articulations cannot be lubricated, even after replacing the lube fitting, dismount the pivot pin, polish its surface and clean
the lube channel. (As ultimate solution, renew the pivot pin).
• Always use acid-free grease. he use of graphite grease is not allowed.
• If so equipped, verify if the platform lock operates smoothly, and lubricate with oil if necessary.
• Most grease plans are filed in the annex of this manual. Grease plans can also be downloaded from our website, or obtained
from your national DHOLLANDIA distributor on request.
www.dhollandia.com  your language  Downloads  Maintenance & Repair Manuals  Grease plans

DHOLLANDIA 15
8 ELECTRIC AND HYDRAULIC DIAGRAMS
§8 1 - General
• DHOLLANDIA tail lifts are regularly being adapted to new vehicle and chassis developments, and specialised customer
requirements. herefore the electric and hydraulic diagrams applicable to your tail lift might deviate from the generic diagrams
contained in this manual.
• he specific diagrams can usually be found inside the main external control box, or inside the pump unit. hey can also be
obtained from your national DHOLLANDIA distributor, or can be downloaded from:.
www.dhollandia.com  your language  Downloads  Electric & hydraulic diagrams (2014-…)  …
• Besides regular electric and hydraulic schematics, all diagrams also explain which solenoids and valves are operated for each
function.
R = Starter solenoid of DC motor in pump unit
H = Control valve LIF in pump unit
D = Electric lock valve on LIF cylinders
S = Control valve IL (OPEN + CLOSE) in pump
unit
O = Electric lock valve on IL cylinders
US = Control valve LEGS OU on stabilising legs (*)
IS = Control vavle LEGS IN on stabilising legs (*)
(*) if so equipped
SA = Single Acting valve
DA = Double Acting valve

DHOLLANDIA 16
N° Description
1 Electric DC motor
2 Starter solenoid R
3 Incoming control terminal R-IC
4 Incoming main terminal R-IM
5 (+) Battery cable from vehicle batteries
6 (-) Ground terminal R-G to thermal fuse
7 hermal fuse F for starter solenoid inside DC motor
8 Outgoing main terminal R-OM
9 (+) erminal of DC motor.
(+) Busbar from starter solenoid to (+) terminal of DC
motor.
10 (-) erminal of DC motor.
(-) Ground cable of DC motor and solenoids
§8 2 - Tail lift terminology: electric DC motor and starter solenoid
Consult the replacement parts lists for a detailed overview of all tail lift components.
1
2
3
4
5
6
7
8
9
10

DHOLLANDIA 17
§8 3 - Tail lift terminology: pump unit of DH-LM 10, DH-LM 15, DH-LM 20
N° Description
1 Electric connection board + 15A fuse
2 Cable inlets + rubber grommets
3 Electric DC motor
4 Starter solenoid
5 Hydraulic pump
1
N° Description
6 Filter
7 Oil tank vent cap
8 Main valve block in pump
9 Oil tank
2
3 4
4
3 5
6
7
9
22 21
N° Description
20 Pressure relief valve
21 Control valve H for LIF
22 Control valve S for CLOSE / OPEN
23 Flow valve
24 Pressure gauge coupling
25 LP (low pressure) return line to oil tank
26 HP outlet to LIF cylinders
27 HP outlet to IL cylinders
28 Switch plunger of logical 3-way valve
8
8
20
24
22 21
6
8
5 23
25
26
27
28
25
6
5
8
3
22
21

DHOLLANDIA 18
§8 4 - Tail lift terminology: pump unit of DH-LM 20 , DH-LM 30
N° Description
1 Electric connection board + 15A fuse
2 Cable inlets + rubber grommets
3 Electric DC motor
4 Starter solenoid
5 Hydraulic pump
6 Filter housing + filter
7 Oil tank vent cap
8 HP (high pressure) outlet of pump
9 Main valve block in pump unit
10 Oil tank
1
2
3
4
5 6
7
8
9 10
10
N° Description
20 Pressure relief valve
21 Control valve H for LIF
22 Control valve S for CLOSE / OPEN
23 Flow valve
24 Pressure gauge coupling
25 HP (high pressure) inlet from pump
26 LP (low pressure) return line to oil
tank
27 HP outlet to LIF cylinders
28 HP outlet to IL cylinders
29 Non-return valve of logical 3-way
valve
9
20
21 22 23
24
25
21
22
26
25
26
27
28 29
23
21 22

DHOLLANDIA 19
§8 5 - Tail lift terminology: pump unit, hydraulic pipes and cylinders
3
4
5, 11
5, 11
8, 12
9, 12
6, 10
7, 10
LP
HP
HP
LP
N° Description
1 Pump unit
2 Oil tank
3 IL cylinder (OPEN - CLOSE)
4 LIF cylinder (LOWER - LIF )
5 LP (low pressure) pipe = return pipe
6 HP (high pressure) pipe IL cylinder
7 HP (high pressure) pipe LIF cylinder
8 Electric lock valve O to OPEN / IL
9 Electric lock valve D to LOWER
10 HP (high pressure) banjo coupling
11 LP (low pressure) banjo coupling
12 Lock valve harness + plug

DHOLLANDIA 20
9 TROUBLESHOOTING AND REPAIR
§9 1 - Introduction
• In case of a malfunction, the operator can verify a number of simple points before calling an approved DHOLLANDIA service
agent:
→ Is the battery disconnect switch in the main external control box, switched on? And / or is the cabin switch in the vehicle
cabin switched on? Is the dual-pole charge line between the tractor unit and trailer properly connected?
→ Is the main fuse or circuit breaker at the battery still passing current? Is the power connection between the battery and tail
lift clean, tight and corrosion free?
→ Is the battery sufficiently charged? Does the tail lift work better when running the vehicle engine?
→ If so equipped, has the mechanical platform lock been released? (NO E Make sure platform is tight against vehicle first!)
• If this has been verified with no success, and an approved service agent intervenes to repair the tail lift, it is very important
that the troubleshooting is performed in a logical and systematic way. oo often components are replaced at random until the
malfunction disappears. However, such methods can be very expensive for labor hours and replacement parts cost.
• herefore, it is very important to identify quickly and precisely if a malfunction has an electric, a hydraulic or a
mechanical cause.
• For instance, when the tail lift doesn’t LOWER, possible causes are that:
→ the solenoid of one of the electric lock valves D on the lift cylinders receive insufficient or no current (= electrical fault);
→ one or both of the cartridges of the lock valves D on the lift cylinders has been hit and bent, or that the flow valve in the
main valve block in the pump unit is blocked (= hydraulic fault);
→ one or both the piston rods of the lift cylinders is bent by overload or accident (= mechanical fault);
→ …
• he tables below can be used to guide you through the troubleshooting. Contact your national DHOLLANDIA distributor if
further advice is needed.
Some steps in the troubleshooting instructions require special skills and specific knowledge, that can be acquired through the
DHOLLANDIA training programs for maintenance and repair. In case of doubt, DON’ go any further, but ask your local
DHOLLANDIA distributor for professional advice.