JLG 1644 Specifications
The JLG 1644 telehandler is a high-capacity,
rough-terrain material-handling machine built to deliver powerful lifting
performance, extended forward reach, and dependable stability across challenging
worksites.
Designed for structural steel erection,
commercial construction, heavy material staging, industrial supply
operations, and demanding rental-fleet environments, the 1644 provides a
rated lift capacity of 15,650 lb (7,100 kg) and a maximum lift height of
43 ft 7 in (13.28 m). A forward reach of 31 ft 1 in (9.47 m) enables
precise placement of materials at elevated or recessed working zones,
reducing crane dependency and improving job-site productivity.
Engineered around a robust chassis, trunnion-mounted steer axles, a
load-sense hydraulic system, and a powerful Deutz 3.6-liter diesel
engine, the 1644 combines high-reach capability with exceptional
operator control. The chassis incorporates reinforced boom structures
and integrated stabilizing geometry that allow the machine to manage
high loads even at extended reach points.
The hydrostatic transmission ensures smooth
directional modulation, while advanced electronic instrumentation,
intuitive joystick control, and ergonomic operator accommodations
support precision tasks. The model is optimized for environments that
require durability, reliability, and adaptable attachment systems
capable of handling diverse lifting, carrying, moving, or staging
operations.
The JLG 1644 is powered by a Deutz TCD 3.6 L diesel
engine, engineered for high torque output, efficient combustion, and compliance
with modern emissions standards. The engine’s strong mid-range torque
characteristics allow precise control during boom extension, heavy lift
initiation, or travel under full load.
Engine specifications:
- Make and model: Deutz TCD 3.6L
- Cylinders: 4
- Displacement: 220 cu in / 3.6 L
- Gross basic power: 134 hp / 100 kW
- Maximum torque: 369 lb-ft / 500 Nm at 2200 rpm
- Fuel tank capacity: 39 gal / 148 L
The 3.6-liter Deutz engine uses high-pressure direct injection, electronic fuel
control, and a modern emissions-compliant after-treatment system. Routine engine
service includes scheduled oil and filter replacement, air-filter inspection,
emissions-system checks, coolant monitoring, and attention to the DEF circuit
when equipped. Cooling is managed via a heavy-duty radiator and thermostatically
controlled coolant flow, supporting the extensive duty cycles encountered during
prolonged lifting operations.
The JLG 1644 features a hydrostatic two-speed
transmission that provides seamless directional transition and excellent
controllability during slow-speed alignment or high-speed travel.
Transmission characteristics:
- Transmission type: Hydrostatic
- Speeds: 2-speed forward, 2-speed reverse
- Top travel speed: 20 mph / 32 km/h
Hydrostatic drive enables precise feathering when placing loads at height. This
allows operators to maintain travel power without compromising lift smoothness
or hydraulic responsiveness.
Axle configuration:
- Trunnion-mounted planetary 45° steer axles
- Integral steer cylinders
- High-bias limited-slip differential on front axle
These axles provide excellent terrain adaptability and ensure torque
distribution even on uneven, slippery, or off-camber surfaces. The rear axle
oscillation further enhances stability.
The braking system is industrial-grade and
designed for high load retention:
- Service brakes: inboard wet-disc brakes, front and rear
- Parking brakes: wet disc, spring-applied hydraulic-release
Wet-disc brake systems deliver long service life with minimal maintenance and
are resistant to contaminants - ideal for construction and industrial
environments.
Electrical instrumentation integrates critical
monitoring and operator-assist features.
Standard instrumentation includes:
- Volt meter
- Hourmeter
- Engine oil-pressure gauge
- Coolant temperature gauge
- Fuel gauge
- DEF gauge
Additional electronic systems include optional reversing cameras, ride-control
indicators, safety alarms, and multifunction displays. Weather-sealed connectors
and harness routing enhance reliability under harsh conditions.
Chassis and Drive
- Full-time 4-wheel drive
- High-strength welded-steel chassis
- Reinforced boom support sections
- Optional enclosed cab and protective packages
Tires:
- Standard: 17.5-25 SGG tires
- Optional: foam-filled versions
These tires are designed for rough terrain, supporting the machine’s high load
rating and improving flotation and stability on mixed surfaces.
The 1644 utilizes a versatile, multi-mode steering system to maximize mobility
in confined or complex environments.
Steering modes:
- 4-wheel circle
- 4-wheel crab
- 2-wheel front
Hydraulic power steering ensures predictable and responsive maneuvering, even
while traveling with elevated loads.
The hydraulic implement system is engineered for
heavy-capacity lifting and precision control.
Hydraulic specifications:
- Hydraulic system capacity: 67 gal / 255 L
- Pump type: Load-sense piston pump
- Auxiliary hydraulics: supplied for attachments requiring cylinder or
hydraulic-motor actuation
Load-sense technology ensures that pump flow and pressure match operational
demand, improving fuel efficiency and minimizing heat buildup. Load-holding
valves are integrated into lift, extend, tilt, and frame-leveling circuits.
Cycle Times
- Lift speed (boom retracted): up 18.3 sec / down 13.6 sec
- Boom extend speed: 15.8 sec
- Boom retract speed: 12.3 sec
- Rated lift capacity: 15,650 lb / 7,100 kg
- Maximum lift height: 43 ft 7 in / 13.28 m
- Load at maximum height: 6,750 lb / 3,062 kg
- Maximum forward reach: 31 ft 1 in / 9.47 m
- Load at maximum reach: 2,000 lb / 907 kg
- Frame leveling: 8°
- Drawbar pull: 23,000 lb / 102 kN
- Overall height: 97 in / 2.46 m
- Overall width: 97 in / 2.46 m
- Overall length: 243 in / 6.17 m
- Wheelbase: 127 in / 3.23 m
- Ground clearance: 19 in / 483 mm
- Outside turning radius: 13 ft 2 in / 4.01 m
- Standard forks: 2.36 x 4 x 48 in (60 x 102 x 1200 mm)
- Standard forks: 2.36 x 4 x 48 in (60 x 102 x 1200 mm)
- Standard forks: 2.36 x 5 x 48 in (60 x 127 x 1200 mm)
- Standard forks: 2 x 6 x 72 in (51 x 152 x 1800 mm)
- Operating weight: 33,660 lb / 15,265 kg
Periodic
maintenance:
- Replace hydraulic and engine oil filters
- Change engine oil and fuel filters per service interval
- Inspect axle lubrication levels
- Clean radiator and coolers
- Inspect lift-arm weldments and pivot points
- Evaluate hydraulic cylinder seals
- Test electronic instrumentation and safety alarms
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