JLG SkyTrak 8042 Specifications
The JLG SkyTrak 8042 telehandler is one of the most
widely used and respected mid-high-capacity telehandlers in the rough-terrain
material-handling market. Designed for structural framing, steel erection
support, masonry work, heavy industrial material placement, and multipurpose
construction roles, the 8042 delivers the ideal blend of lifting power, vertical
reach, and robust chassis stability.
With its 8,000 lb (3,629 kg) rated lifting
capacity and maximum lift height of 41 ft 11 in (12.7 m), the 8042 sits
at the performance center of the SkyTrak family, capable of handling
heavy pallets, suspended loads, job-site containers, and construction
components with ease.
The machine’s Tier-compliant Cummins turbo diesel engine, four-speed
powershift transmission, and selectable steering modes give the 8042
exceptional responsiveness across varied terrains. Its telescopic boom
provides strong load stability throughout the operating envelope, aided
by rear-axle oscillation, load-holding hydraulic valves, and a
reinforced frame engineered for long-term durability.
The operator cab delivers high visibility,
ergonomic controls, intuitive joystick operation, and instrumentation
grouped for efficiency and safety monitoring. Overall, the SkyTrak 8042
is built for reliability, high production output, and reduced downtime -
attributes that have made it a standard in rental fleets and
professional construction operations.
The SkyTrak 8042 is powered by a Cummins QSB4.5T
turbocharged diesel engine engineered for high torque, long life, and consistent
operating performance under heavy loads.
Engine specifications:
- Make and model: Cummins QSB4.5T
- Fuel: Diesel
- Number of cylinders: 4
- Displacement: 274 cu in (4.5 L)
- Torque rating: 305 lb-ft (414 Nm) @ 1,500 rpm
- Rated speed: 2,500 rpm
- Maximum gross power: 110 hp (82 kW)
- Fuel tank capacity: 35 gal (132 L)
The QSB4.5T uses a high-efficiency turbocharger, direct-injection combustion,
heavy-duty cast-iron construction, and an advanced electronic control module.
Its torque characteristics promote strong tractive force and smooth hydraulic
performance. Because telehandlers frequently operate at partial throttle while
lifting, the engine’s torque curve is optimized for mid-range output rather than
peak-speed Hp.
Maintenance tasks include routine oil and filter changes, fuel filter
replacement, coolant inspection, turbocharger inlet cleaning, and periodic belt
inspections. Cummins-supplied diagnostics and JLG-integrated indicators help
identify engine parameters requiring attention.
The 8042 features a
transmission:
- Modulated powershift type
- Forward gears: 4
- Reverse gears: 3
- Maximum travel speed: 20 mph (32 km/h)
The transmission’s modulated clutch packs allow smooth acceleration and
predictable directional changes, critical when transporting loads or maneuvering
in crowded job sites. Gear ratios permit low-speed torque for pushing into
material stockpiles while still enabling higher speeds for cross-site travel.
Axles:
- Full-time planetary 4-wheel drive
- Oscillating rear axle with Stabil-Trak system
Planetary axles distribute torque evenly and withstand high shock loads from
rough terrain. Integrated Stabil-Trak enhances lateral stability by engaging a
leveling mechanism under specific operating conditions.
Brakes
- Hydraulically actuated inboard wet-disc brakes
- Emergency brake with transmission declutch feature
Wet-disc brakes offer a long service life, fade resistance, and minimal
adjustment requirements. The declutch feature disengages drive power when the
emergency brake is applied, improving operator control and safety.
The 8042 incorporates a rugged 12-volt electrical
system capable of supporting engine, transmission, steering, hydraulic, and
attachment-related electrical loads.
Official component values:
- Alternator output: 65 A
- Battery configuration: two batteries, each rated at 850 CCA
Instrumentation includes:
- Warning lights
- Gauges for engine temperature, oil pressure, fuel
- Boom function indicators
- System status indicators
- Diagnostic support (machine-side)
Electrical components are mounted within steel-protected enclosures and use
sealed connectors to prevent moisture and dust ingress.
Drive system: Full-time 4-wheel drive
The frame is fabricated from high-strength steel with reinforced boom mounting
plates. It is engineered to withstand continuous load cycles, side-load forces,
and frame twist that occur during rough-terrain operation.
Tires:
- Standard: 13.00x24 (12-ply air-filled)
- Optional: 13.00x24 foam-filled, rock-type tires, or larger 15.50x25 variants
These tire options allow adaptation for harsh rocky terrain, puncture-prone
environments, and smooth industrial yards. Foam-filled tires provide stability
and eliminate flats at the cost of slightly higher weight.
The 8042 uses a power-assisted hydraulic
steering system with multiple operator-selectable modes:
- 4-wheel circle steering
- 4-wheel crab steering
- 2-wheel front steering
Turning radius: 156 in (3.96 m)
Crab steering allows diagonal movement for precise alignment along walls or when
dropping loads in confined spaces. Circle mode provides minimal turning radius,
while 2-wheel front steering allows conventional travel. Steering response is
strong, predictable, and consistent at varying speeds.
The implement
hydraulic system includes:
- Piston pump
- System capacity: 60 gal (225 L)
- Variable-flow, load-sensing configuration
- Load-holding valves on frame leveling, stabilizer, attachment tilt, extend,
and lift cylinders
Load-sensing hydraulics optimize efficiency by matching hydraulic output to
operating demand. This reduces heat generation and fuel consumption while still
delivering strong, stable boom movement.
Attachment and boom function controls are dual-joystick proportional systems
allowing precision coordination of tilt, lift, extend, and auxiliary flow.
Boom performance:
- Lift speed (boom retracted): up 15 sec / down 12.5 sec
- Boom extend: 14.5 sec
- Boom retract: 14 sec
- Rated capacity: 8,000 lb (3,629 kg)
- Maximum lift height: 41 ft 11 in (12.7 m)
- Frame leveling capability: 10 degrees
- Lift speed (boom retracted): up 15 sec / down 12.5 sec
- Maximum forward reach: 26.6 ft (8.10 m from front tires to 24 in load center)
- Drawbar pull: 24,000 lb (10,886 kg)
- Length (less forks): 225.2 in (5.72 m)
- Width: 98.2 in (2.49 m)
- Height: 99.4 in (2.52 m)
- Wheelbase: 119.5 in (3.03 m)
- Ground clearance: 17.3 in (439 mm)
- Standard carriage: 48 in, 60 in, 72 in
- Side-tilt carriage: 48 in, 60 in, 72 in
- Pallet forks: multiple dimensions including 2x4x48 in
- Lumber forks: 1.75x7x60 in
- Block forks: 2x2x48 in
- Material buckets: 1.25 cu yd and 0.5 cu yd
- Truss booms: 12 ft, options with winch
- Operating weight: 25,365 lb (11,506 kg)
Daily inspections
include:
- Checking engine oil, coolant, and hydraulic levels
- Inspecting tyres and wheel hardware
- Verifying steering and brake function
- Inspecting stabilisers and frame-levelling components
- Checking boom wear pads and lubrication points
- Inspecting hydraulic hoses, lines, and cylinders
- Confirming attachment security and coupler integrity
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