JLG G6-42A Specifications
The JLG G6-42A telehandler is a versatile mid-capacity
rough-terrain material handler engineered for construction, industrial
operations, agriculture, and maintenance applications requiring strong lifting
capability, elevated reach, and reliable performance on uneven surfaces.
Positioned within the 6,600-lb (2,994-kg)
capacity class, the G6-42A offers a combination of power,
maneuverability, and structural durability that makes it suitable for
framing crews, masonry work, steel erection support, warehouse yards,
manufacturing plants, and utility contractors.
The machine delivers a maximum lift height of
42 ft (12.8 m), with solid stability throughout the boom’s working
envelope, allowing precise placement of palletized loads, construction
materials, trusses, and suspended attachments under demanding job-site
conditions.
Engineered with a heavy-duty powershift transmission, full-time 4WD
planetary axles, load-sense hydraulics, and multi-mode steering, the
G6-42A excels in terrain navigation and precise material handling. Its
Cummins turbocharged diesel engine provides the necessary torque for
lifting, tractive effort, and hydraulic multifunction capability.
Operator comfort and usability are also
emphasized, with clear instrumentation, ergonomic joystick controls,
ROPS/FOPS protection, and excellent visibility. With straightforward
maintenance access, durable components, and strong attachment
compatibility, the G6-42A is a proven, reliable telehandler widely
adopted by professional contractors and fleet operators.
The Cummins QSB3.3T is an electronic, turbocharged
industrial engine designed to deliver strong mid-range torque, fuel efficiency,
and excellent reliability in demanding telehandler environments. It uses a
high-pressure fuel injection system to deliver clean combustion and consistent
torque throughout the RPM range, essential for supporting hydraulic system load
and maintaining performance during lifting operations.
Engine Make and Model: Cummins QSB3.3T
Fuel Type: No. 2 Diesel
Operating Cycle: 4-stroke
Number of Cylinders: 4
Displacement: 202 cu in (3.3 L)
Rated Speed: 2,400 rpm
Maximum Gross Hp: 99 hp (74 kW)
Maximum Torque: 305 lb-ft (414 Nm)
Fuel Tank Capacity: 38 gal (141 L))
Air filtration is provided by a two-stage dry air cleaner with a centrifugal
pre-cleaner and continuous dust-removal ejector. A visual air-filter service
indicator helps the operator assess filter loading. Fuel filtration is handled
through a replaceable element filter/water separator, protecting the injection
system from contaminants. The lubrication system employs a full-flow
replaceable-element oil filter.
Cooling is performed through a heavy-duty radiator and belt-driven water pump.
Thermal stability under continuous load is ensured through controlled coolant
circulation, allowing prolonged operation in warm climates and sustained lifting
cycles without overheating.
Transmission
Type: Powershift with torque converter
Speeds: 4 forward / 3 reverse
Maximum forward speed: 19.5 mph (31.4 km/h)
Drive engagement and direction control are located on a single
steering-column-mounted lever. Neutral-start interlock and park-brake engagement
are required before engine start.
The powershift transmission provides smooth gear transitions under load,
allowing operators to maintain full hydraulic capability while maneuvering at
slow speeds. Low gears are optimized for high tractive effort and pushing
forces, while higher gears support faster job-site travel.
Axles
- Trunnion-mounted planetary axles
- Front axle: High-bias limited-slip differential
- Rear axle: Steer axle with 55° steering angle
- Full-time 4-wheel drive
These axles are engineered for durability under heavy loads and harsh terrain,
absorbing shocks and maintaining traction through rutted, muddy, rocky, or soft
ground. Planetary hubs reduce driveline stress and improve torque distribution.
Brakes
Service Brakes: Inboard wet-disc brakes on front axle
Parking Brake: Wet-disc spring-applied hydraulic-release system
Parking brake indicator located on dashboard
Wet-disc brake design provides fade-resistant braking performance, long service
intervals, and protection against contamination in debris-heavy jobsite
conditions.
Voltage: 12V
Alternator: 63 amp
Battery: 810 CCA (cold-cranking amps at 0°F)
Instrumentation:
- Voltmeter
- Hourmeter
- Engine oil pressure gauge
- Coolant temperature gauge
- Fuel gauge
- System indicator lights protected under clear shield
Electrical harnesses are weather-sealed, routed for protection, and designed for
long-term reliability in dusty or wet environments. Optional electrical
accessories include work lights, road lights, a rotating beacon, enclosed cab
harnesses, and climate-control options.
Drive System: Full-time 4-wheel drive
Chassis Type: Welded high-strength steel frame with reinforced boom mounts
Tires
Standard: 370/75-28
Optional: Foam-filled or solid tires
The large tire profile provides excellent flotation on loose terrain and
stability during boom extension. Foam-filled and solid tire options eliminate
flat-tire downtime and increase safety in nail-rich or rubble-dense
environments.
Operator-selectable steering modes:
- 4-wheel circle steering (tightest turning radius)
- 4-wheel crab steering (diagonal motion for alignment next to walls or racks)
- 2-wheel front steering (road/travel mode)
The hydraulic steering circuit includes a primary steering pump and manual
backup steering for emergency steer functionality in the event of hydraulic
pressure loss.
Hydraulic System Type: Open-center, load-sensing,
gear-pump-based
Hydraulic System Capacity: 40 gal (151.4 L)
Pump Type: Single-section gear pump
Filtration: 8-micron return-line filter with visual service indicator, suction
strainer
Cylinders include holding valves on:
- Lift
- Crowd/Tilt
- Telescope
- Sway
Cycle Times
Lift Speed (boom retracted): Up 14 sec / Down 10 sec
Boom Extension: 20 sec
Boom Retraction: 8 sec
Hydraulic holding valves prevent unintended cylinder movement and secure
suspended loads in the event of hydraulic pressure loss. The load-sense system
ensures efficient power distribution, reducing fuel consumption and minimizing
heat generation during multi-function operations.
Rated Capacity: 6,600 lb (2,994 kg) at 24-in load
center
Maximum Lift Height: 42 ft (12.8 m)
Load at Maximum Height: 6,600 lb (2,994 kg)
Maximum Forward Reach: 29 ft (8.83 m) from front tires to 24-in load center
Frame Leveling Capability: 10 degrees
Drawbar Pull: 18,000 lb (8,165 kg)
Overall Length (less forks): 212.6 in (5.40 m)
Width: 95.5 in (2.41 m)
Height: 94 in (2.38 m)
Wheelbase: 128 in (3.25 m)
Ground Clearance: 16.4 in (416 mm)
Outside turning radius: 144 in (3.65 m)
Operating Weight: 20,300 lb (9,208 kg)
250-Hour Interval:
- Change engine oil and filter
- Grease boom pivots and steering joints
- Clean radiator and coolers
- Inspect belts and air-intake system
500-Hour Interval:
- Replace fuel filter
- Inspect hydraulic filter
- Check driveline U-joints and axle seals
- Inspect tilt, telescope, and sway cylinder hardware
1000-Hour Interval:
- Replace transmission oil and filter
- Replace axle lubrication fluid
- Inspect boom chains, wear pads, and pivot bushings
2000-Hour Interval:
- Replace hydraulic fluid
- Flush and refill cooling system
- Complete structural inspection of frame, boom sections, welds, and stabilizing
components
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