www.wackergroup.com
Roller
RD 25
OPERATOR'S MANUAL
0154648en 001
0102
0154648EN
Foreword
wc_tx000001gb.fm
Engine exhaust, some of its constituents, and certain vehicle
components contain or emit chemicals known to the State of California
to cause cancer and birth defects or other reproductive harm.
1. Foreword
This manual provides information and procedures to safely operate
and maintain this Wacker model. For your own safety and protection
from injury, carefully read, understand and observe the safety
instructions described in this manual.
Keep this manual or a copy of it with the machine. If you lose this
manual or need an additional copy, please contact Wacker
Corporation. This machine is built with user safety in mind; however,
it can present hazards if improperly operated and serviced. Follow
operating instructions carefully! If you have questions about operating
or servicing this equipment, please contact Wacker Corporation.
The information contained in this manual was based on machines in
production at the time of publication. Wacker Corporation reserves the
right to change any portion of this information without notice.
All rights, especially copying and distribution rights are reserved.
Copyright 2002 by Wacker Corporation.
No part of this publication may be reproduced in any form or by any
means, electronic or mechanical, including photocopying, without
express written permission from Wacker Corporation.
Any type of reproduction or distribution not authorized by Wacker
Corporation represents an infringement of valid copyrights and will be
prosecuted. We expressly reserve the right to make technical
modifications, even without due notice, which aim at improving our
machines or their safety standards.
WARNING
INTRODUCTION / VORWORT RD25
ii
Menomonee Falls, WI 53051 USA
Wacker Corporation
112232
hp
kW
Rev.
Model
kg
Item Number
lbs
max.lbs
MADE IN
ITALY
max.kg
Manuf. Yr.
Serial Number
dB(A)
Nameplate / Typenschild
A nameplate listing the Model Number and Serial Number OR Model Number, Item Number, Revision, and Serial
Number is attached to each unit. Please record the information found on this plate so it will be available should the
nameplate become lost or damaged. When ordering parts or requesting service information, you will always be
asked to specify the the model number and serial number OR model number, item number, revision number,
and serial number of the unit.
Ein Typenschild mit Typ und Seriennummer ODER Typ, Artikelnummer, Version und Maschinen-Nummer ist an jedem
Gerät angebracht. Die Daten von diesem Schild bitte notieren, damit sie auch bei Verlust oder Beschädigung des
Schildes noch vorhanden sind. Der Typ und Maschinen-Nummer ODER der Typ, die Artikel-Nummer, die
Versions-Nummer und die Maschinen-Nummer sind bei der Ersatzteilbestellung oder Nachfragen bezüglich
Service-Informationen stets erforderlich.
My machine’s numbers are / Die Nummern meines Gerätes sind :
Serial Number
Maschinen-Nummer
Revision
Version
Item Number
Artikel-Nummer
Model number
Typ
RD25RD25
RD25RD25
RD25
00080580008058
00080580008058
0008058
101101
101101
101
50101015010101
50101015010101
5010101
RD25 INTRODUCTION / VORWORT
iii
This manual should be considered as an integral part
of your Wacker machine like any other component. If
it becomes damaged or illegible you should request a
replacement immediately from the manufacturer.
Read the contents of this manual carefully.
Wacker Corporation declines all responsibility for im-
proper use of the machine and for any damages
caused by operations not described in this manual or
otherwise considered as unreasonable use.
The machine must only be used for the purposes for
which it was designed; using the machine for any other
purpose can be dangerous.
Wacker Corporation only accepts responsibility for
machines which conform to their original design.
Any modification to the structure or operating cycle of
the machine must be expressly authorised beforehand
by Wacker Corporation.
Only use original Wacker spare parts. Wacker Corpo-
ration declines all responsibility for damage caused by
use of non-original spare parts.
Wacker operates a policy of continuous improvement
and reserves the right to make changes in machine
design without prior notice.
Use and maintenance of the machine is subject to the
following types of legislation:
• Accident prevention regulations
• The Highway Code and traffic regulations
• Regulations governing road making and earth mov-
ing machinery.
Dieses Handbuch ist Bestandteil des Lieferumfangs
der Maschine; sollte es beschädigt bzw. Teile davon
nicht lesbar sein, so ist umgehend eine neue Kopie
anzufordern.
Die Anweisungen bezüglich Bedienungssicherheit,
Wartung und die Beschreibungen aufmerksam
durchlesen.
Wacker Corporation lehnt jegliche Haftung aufgrund
des nicht bestimmungsgemäßen Einsatzes der
Maschine, sowie für Schäden und Folgeschäden
aufgrund unsachgemäßer bzw. im vorliegenden
Handbuch nicht beschriebener Eingriffe ab.
Die Maschine darf nur bestimmungsgemäß zum Einsatz
kommen; jeder unsachgemäße Einsatz könnte
gefährlich sein.
Wacker Corporation übernimmt die Verantwortung nur
für die Maschine in der Grundausführung gemäß
Konstruktion.
Eine Änderung der Struktur und des Betriebskreislaufes
der Maschine ist von der Technischen Abteilung von
Wacker Corporation ausdrücklich zu genehmigen.
Verwenden Sie ausschließlich Originalersatzteile;
Wacker Corporation lehnt jegliche Haftung für Schäden
und Folgeschäden durch den Einsatz von nicht Original-
Ersatzteilen ab.
Wacker Corporation behält sich das Recht auf
Änderungen in der Konstruktion bzw. Verbesserungen
ohne Ankündigung an Kunden, die bereits über ähnliche
Modelle verfügen, vor.
Für das jeweilige Land sind vorrangig die
• einschlägigen Unfallverhütungsvorschriften
• die Straßenverkehrsordnung
• die für derartige Maschinen und Geräte eventuell
gültigen Normen.
INTRODUCTION / VORWORT RD25
iv
Safety information
This manual contains important safety information and
should be read carefully before using the machine.
The operating and maintenance instructions in this manual
have been provided to ensure safe, efficient use of the
machine for the purposes for which it was designed.
The purpose of this manual is to provide owners and
operators with safe, efficient instructions for the use and
maintenance of the tandem roller. Following these
instructions will safeguard operator safety, reduce repair
costs and downtime and ensure a long, productive
machine life.
This manual must be complete and fully legible and must
be kept where it is immediately available to machine
operators and maintenance staff. Operators and
maintenance staff must be informed of the location of this
manual.
These operating and maintenance instructions are
delivered by your Wacker dealer together with the machine
to ensure that they are read and understood fully. If any
parts of this manual are not clear, do not hesitate to
contact your nearest Wacker dealer for clarification. A full
understanding of the instructions in this manual is your
best guarantee of safe operation.
Carry out the daily maintenance operations as required
and keep a record of the working hours completed by the
machine.
Only use original Wacker spare parts. Original spares
can be obtained from a Wacker area agent who will also
provide advice and instructions on their fitting and use.
Fitting non-original spare parts may cause damage to
other components. We recommend that you obtain your
spare parts exclusively from an authorised Wacker agent
or dealer.
Working conditions world-wide vary greatly and it is
impossible therefore to guarantee that this manual will
cover all the situations likely to be encountered. While
every attempt has been made to ensure that this manual
is up to date, Wacker declines all responsibility for loss or
damage arising out of published material or any errors
and omissions therein. If the machine is to be used in
particularly heavy conditions, we recommend that you
contact your nearest dealer for special instructions. Failure
to observe these instructions may void the guarantee on
your tandem roller.
You are strongly advised to contact your Wacker dealer
in the event of any problems regarding use and
maintenance of the vehicle.
For reasons of clarity, some of the illustrations in this
manual show parts of the machine with the guards or
covers removed. The machine MUST NOT be oper-
ated without the guards and covers in position. Keep
the guards and covers in position at all times when
operating the machine.
WARNING
RD25
Operation
Table of Contents
1A
1A-1
1.1 Safety Notes ............................................................................................. 1A-2
1.2 Application ................................................................................................ 1A-2
1.3 Laws Pertaining to Spark Arresters ........................................................... 1A-2
1.4 Operating Safety ....................................................................................... 1A-3
1.5 Service Safety........................................................................................... 1A-4
1.6 Operator Safety while using Internal Combustion Engines........................ 1A-5
1.7 Warning & Informational Labels ................................................................ 1A-6
1.8 Operating Labels....................................................................................... 1A-7
1.9 Dimensions ............................................................................................... 1A-8
1.10 Technical Data .......................................................................................... 1A-8
1.11 Operation & Service Locations................................................................ 1A-10
1.12 Main Features ......................................................................................... 1A-11
1.13 Hydraulic Equipment ............................................................................... 1A-11
1.14 Engine..................................................................................................... 1A-11
1.15 Chassis ................................................................................................... 1A-11
1.16 Steering .................................................................................................. 1A-11
1.17 Driving Position ....................................................................................... 1A-11
1.18 Operator Presence System..................................................................... 1A-11
1.19 Electrical Equipment ............................................................................... 1A-11
1.20 Transmission .......................................................................................... 1A-12
1.21 Exciter System ........................................................................................ 1A-13
1.22 Braking System....................................................................................... 1A-14
1.23 Throttle lever ........................................................................................... 1A-14
1.24 Water Sprinkling Equipment .................................................................... 1A-15
1.25 Panel Controls and Indications ............................................................... 1A-16
1.26 Lighting equipment .................................................................................. 1A-18
1.27 Isolating the power supply....................................................................... 1A-18
1.28 Roll Over Protection Structure (ROPS) ................................................... 1A-19
1.29 Flashing yellow light ................................................................................ 1A-20
1.30 Driving on slopes and uneven terrain ...................................................... 1A-20
1.31 Anti-theft protection ................................................................................. 1A-21
1.32 Tanks: filling, levels and draining ............................................................ 1A-22
1.33 Seat adjustment ...................................................................................... 1A-23
1.34 Jump starting .......................................................................................... 1A-23
1.35 Fuse box ................................................................................................. 1A-24
1.36 Additional fuses....................................................................................... 1A-24
1.37 Preliminary checks .................................................................................. 1A-25
1.38 Starting the engine .................................................................................. 1A-26
1.39 Stopping the engine ................................................................................ 1A-27
1A-2
1A OPERATION RD25
1.1 Safety Notes
This manual contains NOTES, CAUTIONS, and WARNINGS which must be followed to prevent the possibility of
improper service, damage to the equipment, or personal injury.
Notes:
Notes appear in italics and contain additional
information important to a procedure.
CAUTION: Cautions provide information important to prevent
errors which could damage machine or components.
Warnings warn of conditions or practices which
could lead to personal injury or death!
WARNING
1.3 Laws Pertaining to Spark Arresters
Notice: Some states require that in certain locations, spark arresters be used on internal combustion engines. A spark
arrester is a device designed to prevent the discharge of sparks or flames from the engine exhaust. It is often required
when operating equipment on forested land to reduce the risk of fires. Consult the engine distributor or local authorities
and make sure you comply with regulations regarding spark arresters.
1.2 Application
This machine is designed as a lightweight roller to be used in the compaction of sublayers and finish layers of asphalt
on roads, driveways, parking lots, and other types of asphalt-covered surfaces. Do not use this machine for any other
purpose.
1A-3
RD25 OPERATION 1A
1.4 Operating Safety
Familiarity and proper training are required for the safe operation of mechanical equipment! Equipment operated
improperly or by untrained personnel can be dangerous! Read the operating instructions in both this manual and the
engine manual and familiarize yourself with the location and proper use of all controls. Inexperienced operators should
receive instruction from someone familiar with the equipment before being allowed to operate the machine.
ALWAYS disengage and stow locking bar for the
articulated joint before operating machine. The ma-
chine cannot be steered when the locking bar is
engaged.
ALWAYS check that all controls are functioning prop-
erly immediately after start-up! DO NOT operate
machine unless all controls operate correctly.
ALWAYS remain aware of changing positions and
movement of other equipment and personnel on the
jobsite.
DO NOT attempt to start the machine when standing
alongside. Only start the engine when seated in the
driver's seat and with the forward-reverse lever in the
neutral position.
ALWAYS remain aware of changing surface condi-
tions and use extra care when operating over uneven
ground, on hills, or over soft or coarse material. The
machine could shift or slide unexpectedly.
ALWAYS use caution when operating near the edges
of pits, trenches or platforms. Check to be sure ground
surface is stable enough to support the weight of the
machine and that there is no danger of the roller
sliding, falling or tipping.
ALWAYS wear protective clothing when operating
equipment. Wear goggles or safety glasses, hearing
protection, safety helmet and work gloves.
ALWAYS keep hands, feet, and loose clothing away
from moving parts of equipment.
ALWAYS read, understand, and follow procedures in
Operator’s Manual before attempting to operate equip-
ment.
WARNING
ALWAYS store equipment properly when it is not
being used. Equipment should be stored in a clean,
dry location out of the reach of children.
ALWAYS operate machine with all safety devices
and guards in place and in working order.
ALWAYS be sure that all other persons are at a safe
distance from the machine. Stop the machine if
people step into the working area of the machine.
NEVER allow improperly trained people to operate
this equipment. People operating this equipment must
be familiar with the potential risks and hazards asso-
ciated with it.
NEVER touch engine or muffler while machine is
operating or immediately after it has been turned off.
These areas get hot and may cause burns.
NEVER use accessories or attachments which are
not recommended by WACKER for this equipment.
Damage to equipment and/or injury to user may
result.
NEVER leave machine running unattended.
NEVER operate a defective unit in need of service or
repair.
NEVER operate with fuel cap loose or missing.
NEVER carry passengers. Danger of crushing —
keep clear of the central steering joint between the
front and rear frames.
NEVER use or attempt to repair damaged safety belts
or ROPS. Replace only with WACKER spare parts.
1A-4
1A OPERATION RD25
WARNING
1.5 Service Safety
Poorly maintained equipment can become a safety hazard! In order for the equipment to operate safely and properly
over a long period of time, periodic maintenance and occasional repairs are necessary. Maintenance should only be
performed by suitably trained personnel.
DO NOT stand under the machine while it is being
hoisted or moved.
DO NOT get onto the machine while it is being hoisted
or moved.
DO NOT use the machine as a ladder. Use safe
ladders and platforms designed for this purpose.
DO NOT attempt to clean or service machine while
it is running, the engine is hot, or the machine is
moving. Rotating parts can cause severe injury.
DO NOT use gasoline or other types of fuels or
flammable solvents to clean parts, especially in en-
closed areas. Fumes from fuels and solvents can
accumulate and become explosive.
DO NOT modify the equipment without express writ-
ten approval of the manufacturer.
DO NOT modify, weld or drill safety frames (ROPS).
DO NOT loosen or remove bolts. DO NOT weld, drill
or modify a broken safety frame.
ALWAYS keep area around muffler free of debris
such as leaves, paper, cartons, etc. A hot muffler
could ignite them, starting a fire.
ALWAYS replace worn or damaged components
with spare parts designed and recommended by
WACKER for servicing this machine.
ALWAYS keep machine clean and labels legible.
Replace all missing and hard-to-read labels. Labels
provide important operating instructions and warn
of dangers and hazards.
ALWAYS check and tighten all external fasteners
at regular intervals.
Before starting any maintenance operations, switch
off the machine and remove the ignition keys from
the control panel.
Switch off the power supply at the isolator before
adjusting or maintaining the electrical equipment.
Before you start the machine, ensure that all tools
have been removed from the machine and that
replacement parts and adjusters are firmly tight-
ened.
Before dismantling hydraulic connectors or hoses,
ensure that all pressure has been bled from the
circuit.
Fluid leaks from small holes are often practically
invisible. DO NOT use your bare hands to check for
leaks. Check for leaks using a piece of cardboard
or wood.
WARNING
1A-5
RD25 OPERATION 1A
DO NOT refuel engine near open flame.
DO NOT spill fuel when refueling engine.
DO NOT operate near open flames.
ALWAYS refill fuel tank in well-ventilated area.
ALWAYS replace fuel tank cap after refueling.
ALWAYS keep area around hot exhaust pipes free
of debris to reduce the chance of an accidental fire.
DO NOT run machine indoors or in an enclosed area
unless adequate ventilation, through such items as
exhaust fans or hoses, is provided. Exhaust gas from
the engine contains poisonous carbon monoxide
gas; exposure to carbon monoxide can cause loss of
consciousness and may lead to death.
DO NOT smoke while operating machine.
DO NOT smoke when refueling engine.
DO NOT refuel hot or running engine.
1.6 Operator Safety while using Internal Combustion Engines
Internal combustion engines present special hazards during operation and fueling! Failure to follow the safety guidelines
described below could result in severe injury or death.
WARNING
1A-6
1A OPERATION RD25
Safety alert. During
fueling, no sparks,
flames, or burning
objects near machine.
1.7 Warning & Informational Labels
This WACKER machine uses international pictorial labels where needed. These labels are described below:
Pictorial Meaning Pictorial Meaning
Safety alert.
Read operator’s manual for
instructions.
Pinch point
Grease points:
Inspect and lubricate every
50 hours of operation.
Tie-down point
(one of two)
Hydraulic oil
reservoir level
Hydraulic oil
reservoir fill
Hydraulic oil
reservoir drain
Lift point
(one of four)
110167
110176
111418
111760
111760
112216
110032
111418
110200
50
Warning! Electrical
shock hazard!
Warning! Do not approach
the machine while it is
moving.
112235
112230
112228
Water tank fill
1A-7
RD25 OPERATION 1A
1.8 Operating Labels
Pictorial Meaning Pictorial Meaning
This WACKER machine uses international pictorial labels where needed. These labels are described below:
P
Variable direction control:
Forward
Neutral
Reverse
112233
Variable throttle:
Low RPM
High RPM
112236
Parking brake is engaged
Parking brake is disengaged
Water control valve
is fully open
Water control valve
is fully closed
Electrical isolator switch
open - closed
112234
112234
112339
89712
89712
1A-8
1A OPERATION RD25
1.10 Technical Data
1.9 Dimensions
Sound and Vibration Measurements
The required sound specification, per Appendix 1, Paragraph 1.7.4.f of the EC-Machine Regulations, is:
- the sound pressure level at operator's location (L
pA
) = 84 dB(A).
This sound value was determined according to ISO 6081 for the sound pressure level (L
pA
) at the operator's location
with the machine stationary at maximum RPM and the exciter off.
The weighted effective acceleration value, determined according to ISO 8662 Part 1, is approximately:
Hands = 0.8–1 <2.5 m/s
2
, Feet = 1.5–2 m/s
2
, Seat = 0.2–0.3 <0.5 m/s
2
.
The vibration measurements were obtained with the machine moving on hard asphalt at maximum RPM.
BB01320
I
B
J
L
D
F
E
E
K
A
F
J
B
I
G
C
H
ABC D E F G H IJKL
in. 102.4 43.3 70.9 51 36.4 29.5 113.5 7.9 1.8 1.6 72.8 80
mm 2600 1100 1800 1295 925 Ø 750 2882 200 46 40 1850 2030
1A-9
RD25 OPERATION 1A
Engine
Roller
Engine Make
Engine Model
Power
Hp (kW)
Displacement in
3
(cm
3
)
Starter type / V / kW
Alternator Volts / Amps
Air Cleaner type
Operating Speed rpm
Valve Clearance (cold) intake in. (mm)
exhaust
Battery V / Size
Fuel type
Fuel Capacity gal. (l)
Fuel Consumption gal. (l)/hr.
5510 (2500)
5113 (2320)
102.4 x 46.7 x 120.1 (2600 x 1186 x 3053)
43.3 (1100)
29.5 (750)
8 (200)
42.3 (160)
13.1 (4.0)
0 – 5
(0 – 8.0)
(1)
3200 (53.3)
Rev. 104 and lower Rev. 105 and higher
Hatz Hatz
2M41L 2M41-153J
32.6 (24.3)
104.7 (1716)
Electric / 12 / 2.7
14V / 50
Single Element
2650
0.004 (0.10)
0.004 (0.10)
12 / 100 Amp-hour
Clean, filtered diesel
14.8 (56)
1.8 (6.7)
Lubrication
Engine Crankcase
Hydraulic System
Exciters (each)
Articulated Joint
Drive Bearings -
front and rear drums
Quantity
1.5 U.S. gal. (5.5 liters)
22.5 U.S. gal. (85 liters)
1.3 U.S. gal. (5 liters)
4 – 5 shots with hand-held
grease gun
Sealed
Operating Weight lb.(kg)
Dry Weight lb.(kg)
Overall Size l x w x h in. (mm)
Drum Width in. (mm)
Drum Diameter in. (mm)
Ground Clearance in. (mm)
Water Tank Capacity gal. (l)
Outside Turning Radius ft. (m)
Forward / Reverse Speed mph (km/hr)
Gradeability
Vibration Frequency vpm (Hz)
Please refer to the Main-
tenance section for the
recommended lubricants
and their equivalents.
Type
(1)
Please refer to Section 1.30
Driving on slopes and uneven terrain.
1A-10
1A OPERATION RD25
1.11 Operation & Service Locations
1 Diesel engine
2 Hydraulic transmission pump
3 Front hydraulic transmission motor
4 Rear exciter hydraulic motor
5 Exciter/Steering hydraulic pump
6 Exciter solenoid valve
7 Front exciter hydraulic motor
8 Rear hydraulic transmission motor
9 Hydrostatic steering
10 Brake
11 Oil Cooler
12 Electric water pump
BB01206
A - Throttle lever
B - 3-position ignition switch
C, D, M, K, V, W, I, O, U, - indicating lights
E - Hour meter
F - FORWARD/REVERSE lever
H - Parking and emergency brake button
J - Light switch and horn button
L - Direction indicator switch
N - Rear work lights switch
P - 6 fuses
Q - Exciter selector switch
R - Exciter ON/OFF switch (on forward/
reverse lever)
S - Drum sprinkler valve
T - Water pump switch
D
E
U
KJ
Q
T
I
O
P
W
V
C
N
L
M
B
BB00108 BB00114
S
H
F
R
A
G
765112
311 4
8
10
9
2
10
1A-11
RD25 OPERATION 1A
1.12 Main Features
The RD25 incorporates the following innovative features:
• Drive on both drums.
• Vibration on both drums at a single amplitude and
frequency; vibration on the front drum only is also
possible.
• Central steering joint.
• Hydrostatic series transmission.
• Hydraulic series powered vibration.
• Hydrostatic steering.
• Negative hydraulic brakes on both drums.
• Water sprinkler equipment on both drums.
• Lighting and electrical equipment to highway code
standard.
• Stainless steel water tank.
• Speeds from 0–5.0 mph (8.0 kph).
1.17 Driving Position
The driving position has a large, comfortable seat provid-
ing good visibility to both sides of the machine. The
steering wheel has a knob. The dashboard houses the
ignition key, an electric hour meter and the engine
warning lights. The forward-reverse, brake, and accel-
erator levers are ergonomically positioned.
1.13 Hydraulic Equipment
The hydrostatic drive of the transmission and vibrating
systems is protected by an oil cooler and filters. The
transmission filter has a “filter clogged” indicator (a
vacuum gauge) on the inlet side of the pump.
1.19 Electrical Equipment
The electrical system is powered by a 12 Volt, 100 Ah
battery. The vehicle is fitted with a complete set of road
and work lights.
1.15 Chassis
The chassis consists of two half-frames linked by a
central steering joint. The front half-frame carries the
engine and transmission equipment and one of the drive/
exciter drums. The rear half-frame carries the driving
controls, the water tank and a drive/exciter drum.
1.14 Engine
The machine has an air-cooled diesel engine with electric
starter. The engine powers the hydraulic pump for the
steering and exciter equipment and the hydraulic trans-
mission pump.
1.16 Steering
A hydraulic gear pump drives the ORBITROL steering
servo which is controlled by the steering wheel. The
steering servo feeds oil to the double-acting steering
cylinders. In the event of a drop or failure in the pressure
supplied by the hydraulic gear pump, the steering will
continue to operate because the ORBITROL servo unit
will also act as a pump.
Turning the steering wheel G to the left or to the right
causes a corresponding movement of the front half-
frame. The steering joint between the two half-frames
has been designed so that the tracks made by the front
and rear drums are identical on all turning circles.
BB00016
1.18 Operator Presence System
The machine is fitted with a safety device which locks the
engine transmission when the driver stands up or leaves
the driver’s seat. The machine can therefore only be
driven when the driver is seated.
1A-12
1A OPERATION RD25
1.20 Transmission
Both roller drums are driven. A variable displacement
pump and hydrostatic transmission drive the hydraulic
motors fitted to each drum. Forward and reverse travel
are selected using a forward-reverse lever located to the
side of the driver’s seat. In order to comply with safety
standards, the machine has a safety device which only
enables starting of the diesel engine when the forward-
reverse lever is in the neutral position.
FORWARD-REVERSE lever
Shift the lever F into “Forward” A or “Reverse” I according
to the direction of travel desired.
An increase or decrease in road speed is obtained by
moving the lever forwards or backwards; road speed
varies from “ZERO” to a permitted maximum of 5 mph
(8.0 kph) Road speed is the same in both “Forward” and
“Reverse”. If you wish to change direction of travel from
FORWARD to REVERSE or vice versa, move the lever
to the "N neutral” position, allow the vehicle to come to a
complete stop, then move the lever in the direction
desired. The lever runs in a slider which prevents any
sudden inversion of the lever. The end of this lever is also
fitted with a switch R for the exciter pump.
Note: The machine is equipped with an "operator pres-
ence system". This "system" permits the machine to
move only when the operator is seated in the driving
position. The machine's motion is suspended when the
operator rises from the driving position consequently
activating the negative brake.
To restart:
• sit down in the driving position
• place forward/reverse lever into neutral
• operate forward/reverse lever.
When negotiating gentle slopes, keep the engine at high
rpm's and the Forward/Reverse lever at the minimum
position.
Refer to section 1.30
Driving on slopes and uneven
terrain
for gradient limits. Vehicle speed must also be
regulated in accordance with current ground conditions
and vehicle road holding ability.
CAUTION: This vehicle has a hydrostatic transmission
which means that the Forward/Reverse lever can also be
used as an engine brake. Shifting the lever to the neutral
position stops the vehicle.
F
BB00012
R
I
A
N
112233
1A-13
RD25 OPERATION 1A
1.21 Exciter System
The exciter is electrically controlled and operates on both
drums. The exciter is driven by a gear pump. The
hydraulic motor, fitted to one side of the rear drum, is
splined onto the shaft of an eccentric weight by a splined
coupling. A switch on the forward-reverse lever operates
the exciter. The vehicle chassis is isolated from vibra-
tions by a series of shockmounts.
Exciter selector switch
Use this selector switch Q to select vibration on both
drums or vibration on the front drum only. Switch on the
vibration mode selected by using the exciter switch R.
Position 1: vibration on both drums
Position 0: vibration on front drum only
Exciter ON/OFF switch
To start vibration, turn the switch R to position 1.
To stop vibration, turn the switch R to position 0.
CAUTION: Do not keep the vibration running when the
vehicle is to remain stationary for some time.
Keeping the exciter on for a prolonged period when the
machine is stationary may cause serious damage to the
exciter equipment.
BB00108
1030SD44
Q
Q
0
1
BB00114
BB00064
R
0
R
1
1A-14
1A OPERATION RD25
1.22 Braking System
The machine is fitted with negative brakes. Negative
brakes are automatically applied when there is no hy-
draulic system pressure. Hydraulic system pressure falls
when the forward-reverse lever is moved to the “0”
(neutral position), when the diesel engine is switched off,
or when there is a fault in the hydraulic system.
Service brake: this hydrostatic brake is applied when the
forward-reverse lever is moved to its central “neutral”
position.
Safety and parking brake: there is a multi-disc mechani-
cal brake on each drum. The brake is controlled by a push
button. In the event of a pressure failure in the hydraulic
braking circuit, the brakes automatically switch to the
“on” position.
The push button H is hydraulic and operates the negative
brake of the hydraulic drive motor.
Position 1 - Brakes on
Position 2 - Brakes off
The “Brakes ON” warning light I comes on when the
lever H is in position “1”.
Note:
Negative brakes are automatically applied when
there is no hydraulic system pressure. Hydraulic system
pressure falls when the diesel engine is switched off or
when there is a fault in the hydrostatic transmission.
CAUTION: Do not use the parking or emergency brakes
when the machine is moving. The parking or emergency
brakes can only be used when the machine is moving in
cases of extreme emergency, i.e. following failure of the
main braking system (moving the Forward/Reverse lever
to the neutral position) or on slopes.
BB00106
H
A
MinMax
BB00114
BB00069
1.23 Throttle lever
This lever A adjusts the rpm of the diesel engine between
two positions:
Position “Min” - minimum throttle
Position “Max” - maximum throttle
When starting the engine, move the lever forward to the
first 1/4 of its total travel.
I
21
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