425 EXY
425 EXY
AT A GLANCE
GVM 24,000 kg
GCM 50,000 kg (GIGA 425)
68,000 kg (GIGAMAX 425)
Engine Type Isuzu SiTEC 425
Displacement 15.7 L
Power 316 kW @ 1,800 rpm
Torque 2,059 Nm @ 1,100 rpm
Wheelbase 3,885 mm
425 EXY
425 EXY
DRIVELINE & CHASSIS SPECIFICATIONS
ENGINE: ISUZU SiTEC 425 SiTEC 425
Maximum Power : 316 kW @ 1,800 RPM
Isuzu 6WG1-TC 6 cylinder, 24 valve, in line, overhead Maximum Torque : 2,059 Nm @ 1,100 RPM
camshaft, direct injection, 4-stroke, diesel.
Turbocharged and air-to-air intercooled.
Cooled exhaust gas recirculation system.
Electronic governer with integral speed limiter and cruise
control with resume function.
Bore & Stroke: 147 x 154 mm
Displacement: 15,681 cc
Compression Ratio: 15.5:1
Torque (Nm)
Power (kW)
Power: 316 kW @ 1,800 rpm (ISO 1585 NET)
Torque: 2,059 Nm @ 1,100 rpm (ISO 1585 NET)
Emission Standard: ADR 80/00 (Euro III)
AIR INTAKE SYSTEM
• Donaldson dry element, 15” two stage air filter. Vertical air
intake stack with slim profile side intake.
EXHAUST SYSTEM
• Vertical muffler with bright perforated heat shield on right side.
• Air controlled, butterfly type exhaust brake (up to 350 hp
retardation at 2,200 rpm). Exhaust brake idle cut-out switch.
Engine Speed (RPM)
FUEL SYSTEM
ISUZU SiTEC 425 (6WG1-TC) ENGINE PERFORMANCE CHART
• Denso common rail fuel injection system. In-line fuel filter
and water sedimenter.
• Fuel tank: 1 x 450 L Hilton aluminium cylindrical (LHS) with
AXLES
two full length tank-mounted steps. FRONT: MERITOR FG941
LUBRICATION SYSTEM • 6,600 kg capacity.
• 3.5” drop centres and oil bath hubs.
• Pressure feed lubrication system. Oil capacity 31.0 L
(including filters). • 42° wheel cut angle.
REAR
CLUTCH GIGA 425 EXY GIGAMAX 425 EXY
EATON FULLER (SPICER) 15.5” MERITOR RT40-145GP MERITOR RT46-160GP
• Twin plate clutch (6 pads) with clutch brake. • 18,100 kg capacity tandem • 21,000 kg capacity tandem
• Asbestos free lining material. axle set with integral oil pump. axle set with integral oil pump.
• Pneumatic clutch release assistance. • Final drive ratio 4.111:1 • Final drive ratio 4.30:1
(Standard; others available) (Standard; others available)
TRANSMISSION • Inter-axle differential lock. Driver controlled differential
• Eaton Fuller RTLO 16913A 13 speed (EXY Standard cab). cross-locks on both axles.
• Eaton Fuller RTLO 16918B 18 speed (EXY Custom cab). • Banjo type, fully floating, single reduction
• Eaton Fuller RTLO 18918B 18 speed (GIGAMAX Custom). SUSPENSION
• Overdrive, constant mesh transmission with integral oil FRONT
pump and oil cooler.
• Long span alloy steel tapered leaf springs.
• Gear ratios: 13 speed transmission
• Nominal size: 1,800 x 80 mm
Forward: (:1)
• Total spring capacity (at ground): 6,740 kg
Lo: 12.31 1st: 8.64 2nd: 6.11 3rd: 4.43 • Stabiliser bar and shock absorbers.
4th: 3.23 5th L: 2.29 5th H: 1.95 6th L: 1.62
6th H: 1.38 7th L: 1.17 7th H: 1.00 8th L: 0.86 REAR
8th H: 0.73 • EXY - Hendrickson HAS 400 air bag rear suspension. Total
Reverse: (:1) spring capacity (at ground): 18,140 kg
Hi Rev H: 2.99 Hi Rev L: 3.50 Lo Reverse: 13.22 • GIGAMAX - Hendrickson HAS 461 Heavy Duty air bag rear
• Gear ratios: 18 speed transmission suspension. Total spring capacity (at ground): 20,865 kg.
Forward: (:1) • Dual height control valves.
Lo L: 14.40 Lo H: 12.29 1st L: 8.56 1st H: 7.30 • Transverse torque rod and shock absorbers.
2nd L: 6.05 2nd H: 5.16 3rd L: 4.38 3rd H: 3.74 • In-cab height raise/lower and dump switch for hitching and
4th L: 3.20 4th H: 2.73 5th L: 2.29 5th H: 1.95 unhitching trailers (external switch also supplied).
6th L: 1.62 6th H: 1.38 7th L: 1.17 7th H: 1.00
8th L: 0.86 8th H: 0.73 BRAKES
Reverse: (:1) MERITOR “Q PLUS”
Hi Rev H: 2.99 Hi Rev L: 3.50 Lo Reverse: 13.22 • Full air, S-cam dual circuit brake system. Automatic slack
• Spicer propeller shaft. Spicer Inter-axle shaft. adjusters. Asbestos free lining material.
• Front drum diameter: 419 mm CHASSIS FRAME
• Rear drum diameter: 419 mm • Ladder type, parallel rail, tapered, C-section type. HT540 steel.
• Swept area: 12,716 cm2 • Frame dimensions
• Air Compressor: 519 L/min at 700 kPa at 2,000 engine rpm. Side rail (mm): 285 x 85 x 8
• Total capacity 118.4 L, Air dryer (heavy duty desiccant type). Rear frame width (mm): 850
• Spring parking brake acting on all rear wheels. • Turntable angles supplied.
• Trailer brake connection at rear of cab.
ELECTRICAL SYSTEM
STEERING • 24 Volt electrical system.
• Power assisted recirculating ball steering. • 24 Volt, 60 Amp alternator(1.5 kW).
• Steering ratio: 22.4:1 • 24 Volt, 7.4 kW starter motor.
• 2 x 145G51(754CCA) batteries connected in series.
WHEELS AND TYRES • 24 Volt electrical connectors at rear of cab.
• 8.25 x 22.5-10 stud ISO standard steel disc rims. 335 mm PCD.
• 295/80R22.5 152/148M Michelin XZE2 steer tyres. GENERAL OPTIONS (available at extra cost)
Rating: 3,550 kg per tyre • Additional Hilton fuel tank (Increases total capacity to 900 L).
• 11R22.5 148/145 L Michelin XDE2 drive tyres. • Alternative axle ratios on request from your Isuzu Dealer.
Rating: 2,900 kg per tyre (dual configuration)
• Spare rim only supplied on chassis (no spare tyre). DEALER-FITTED ACCESSORIES INCLUDE:
• 10-Disc CD stacker (standard on Custom Cab).
AXLE LOAD SUMMARY • Voltage reducer (24 Volt-12 Volt) for 12 Volt trailer electrics.
GIGA 425 EXY FRONT REAR • Roof Mounted Air Deflector. Designed by Isuzu for use with
Axle Capacity (kg): 6,600 18,100 tall body designs, reducing fuel consumption.
Spring Capacity (kg): 6,740 18,140 • Full aerodynamic fairing, designed to integrate with rear of
Tyre Capacity (kg): 7,100 23,200 cab and roof-mounted air deflector. Fills the space between
rear of cab and front of body or trailer, reducing
Legal Limit (kg): 6,000 17,000 aerodynamic drag and minimising fuel consumption.
Limit (kg): 6,000 17,000
• Alcoa forged aluminium alloy wheels, reducing tare mass
GIGAMAX 425 EXY FRONT REAR by 135 kg and improving appearance.
Axle Capacity (kg): 6,600 21,000 • Anti-Lock Braking Systems (ABS). Meritor axles and brakes
Spring Capacity (kg): 6,740 20,865 are compatible with WABCO and Bosch systems.
Tyre Capacity (kg): 7,100 23,200 • 5th wheel assembly.
Legal Limit (kg): 6,000 17,000 • HAS 460 suspension upgrade kit (for 50,000 kg GCM models).
Limit (kg): 6,000 17,000 • Rear wheel guards.
Note: Vehicle loading limit is determined by the combination of axle loading
limit, GVM and GCM limit, and government regulatory requirements. Consult
your Isuzu dealer to select the correct vehicle for your specific application.
CABIN SPECIFICATIONS AND APPOINTMENTS
CAB EXTERIOR • Isringhausen 6800 driver’s air suspended seat with
integrated seat belt, pneumatic lumbar support, automatic
• All steel cab with welded ribs and side door impact beams. weight adjustment and dump button for ease of entry and
Standard colour: Arc White. exit. Height, rake and backrest recline adjustment.
• Hydraulic/electric cabin tilt to 48°. Air suspended cab with Outboard non-suspended reclining co-driver’s seat with
four electronically controlled pneumatic mounts, shock matching Isringhausen trim.
absorbers and torque tube. • Easy entry grab handles on 'A' and 'B' pillars.
• Large bumper bar / air dam with enclosed step holes • Large centre console with integrated heat/cool box and
and footplate. twin cup holders.
• Halogen headlights in bumper with hinges for easy • Electric windows. Central locking with remote keyless entry.
cleaning. ‘Hella’ fog lights integrated into air dam.
• Eurovox radio CD player with digital anti skip memory and
• Three arm windscreen wipers with triple washer jets 4 speakers (13 speed model only).
mounted on washer arms.
• ADR compliant sleeper mattress:
• Main external rear view mirrors with integrated convex approx. 2,200 x 600 x 100 mm
‘spotter’ mirror on both sides. Electric remote adjustment
and heating elements in all four external mirrors. • Air conditioning vent in sleeper compartment.
• Integrated front corner vanes for improved airflow. • Centre curtain for privacy when sleeping.
• Fully enclosed alloy, non-slip cab entry steps. Large grab • Secure storage trunk with external access on LHS.
handle mounted adjacent to muffler.
CUSTOM CAB FEATURES (18 spd models only)
CAB INTERIOR • Custom badges. Gold colour Isuzu badge.
• Fully trimmed cab interior with cloth seat facings, formed • Complete wrap-around window curtains - covers all windows.
roof lining and overhead storage lockers. Sun visors on • Wood grain appearance to instrument panel.
both sides. Fluorescent overhead interior lamp. Integrated
air conditioning. Carpet on cab floor. • Leather wrap steering wheel.
• 24 Volt & 12 Volt cigarette lighter/electrical accessory socket. • Eurovox radio cassette player with premium rear speakers.
10 disc CD stacker with digital anti skip.
13 spd: 8EX22-311 18 spd custom: 8EX22-417
425 EXY
18 spd custom: 8EX22-447
425 EXY
PERFORMANCE (Calculated)
GIGA 425 EXY GIGAMAX 425 EXY
Max Geared speed: 130* km/h @ 2,000 rpm 125* km/h @ 2,000 rpm
Gradeability (lowest gear) : 40% (13 spd), 47% (18 spd) at 45,500 kg GCM 49% at 45,500 kg GCM
Gradeability (top gear at 100 km/h): 0.8% (semi trailer at 45,500 kg GCM) 0.8% (semi trailer at 45,500 kg GCM)
Engine speed (top gear at 100km/h) : 1,535 rpm 1,605 rpm
Performance figures quoted are representative only and based on typical dimensions, body styles and weights. Please consult your Isuzu dealer for an estimation based on your specific application. *Road speed limited to 100 km/h
MODEL RATINGS AND DIMENSIONS
MODELS RATINGS(kg) TARE MASS#(kg) DIMENSIONS (mm) TURNING
CIRCLE
GVM GCM TOTAL FRONT REAR WB OAL FOH ROH CA CE FFH RFH KERB
UNLADEN UNLADEN TO KERB
GIGA 425 EXY 24,000 50,000 7,300 4,275 3,025 3,885 6,920 1,400 1,635 3,165 4,800 900 1,040 14.9m
GIGAMAX 425 EXY 24,000 68,000 7,510 4,250 3,260 3,885 6,920 1,400 1,635 3,165 4,800 900 1,040 14.9m
#Estimated mass of cab/chassis with oil, water and fuel tank containing 20 litres of fuel
and excluding spare rim (40kg) and tools (30kg). Option Masses: • Roof Mounted Air
Deflector add 35 kg • Side fairings add 60 kg • Additional fuel tank add 90 kg
CE
CA
2475 720
2490 1845 2720
2940
FFH RFH
For further information regarding Cab/Chassis dimensions
your Isuzu Dealer can access detailed Body Builders
diagrams from the Isuzu Truck Technical Reference CD.
1165
1310
2015 FOH WB ROH
OAL
ISUZU NEW TRUCK WARRANTIES
* Subject to the conditions outlined of the I-GM New Vehicle Warranty, every Isuzu Giga Series
STANDARD TRUCKPOWER WARRANTY* Truck carries a warranty which covers your complete vehicle for the first 36 months or 500,000
km (whichever comes first). Normal exclusions apply: e.g. tyres and batteries (refer to your
NEW VEHICLE 3 years 500,000 km Isuzu Dealer for details).
A 60 month or 750,000 km (whichever comes first) major engine components warranty runs
ENGINE COMPONENTS* 5 years 750,000 km concurrently with the New Vehicle Warranty for Giga Series models. A 36 month unlimited km
cab perforation corrosion warranty runs on all models.
CAB CORROSION 3 years unlimited * Engine components are as follows: Cylinder block, cylinder head and crankshaft.
Why have Isuzu Trucks been YOUR ISUZU DEALER
Australia’s No. 1 choice since 1989? *
• Widest range of models to suit most applications
• Premium componentry and Isuzu diesel engines
• Network of over 40 specialist Isuzu Dealerships and branches
• Sales, services and parts support
• Predictable operating costs through Dealer ISIS program
• Factory and range of extended warranties available
• High resale values
• Leading reputation for reliability
www.isuzu.com.au * Source Truck Tracker 2003
ISUZU-GENERAL MOTORS AUSTRALIA LTD A.C.N. 006 962 572. PLEASE NOTE: as the policy of I-GM is one of continual product improvement, all specifications and equipment are subject
to change without notice. No I-GM dealer or other person is authorised or permitted to give or make any statement, assertion or undertaking in relation to the quality, performance, characteristics,
descriptions or fitness for any purpose of any I-GM product or in connection with the supply of any I-GM product which is at variance with any written statement, assertion or undertaking on any
of these subjects given or made by I-GM in its published sales literature, and the company accepts no liability for any such unauthorised action. I-GM has franchised dealers in many parts of
Australia, for the sale of service, parts and the provision of service to the owners of I-GM products. Every endeavour is made to ensure that such dealers carry adequate stocks of service parts
and are equipped to provide satisfactory service, but makes no promise, other than that contained in the I-GM new vehicle warranty, that such parts or service facilities will be available or
available at any specific location or at any particular time. A word about this specification sheet. We have tried to make it as comprehensive and factual as possible. However, since the time of
printing some of the information you will find here may have been updated. Also, some of the equipment shown or described through this specification sheet may have been changed and/or is
available at extra cost. And the right is reserved to make changes at any time without notice, in prices, colours, materials, equipment and models. Your I-GM dealer has details and before
ordering, you should ask him/her to bring you up to date. OCTOBER 2004. ARK/IGM 0149
