Cat TH408D Specifications
The Caterpillar TH408D telehandler is a
high-performance, mid-capacity agricultural and industrial material handler
designed for versatility, lifting power, and reliability in demanding field and
construction environments. It belongs to Caterpillar’s D-Series telehandler
lineup, which introduced significant improvements in hydraulic response,
operator comfort, fuel efficiency, and structural strength.
The TH408D is engineered to lift up to 4,000 kg
(8,818 pounds), reach materials at heights of 7.6 meters (24.9 feet),
and extend forward to a reach of 4.3 meters (14.1 feet), making it
suitable for hay stacking, pallet handling, bulk material loading,
construction staging, and general farm use.
This model offers a strong balance between size, maneuverability, and
lift performance. Its advanced load-sensing hydraulic system allows
smooth multi-function operation, ensuring precise control even during
simultaneous lift and telescoping movements. The TH408D is available
with multiple Cat C4.4 ACERT engine configurations, delivering fuel
efficiency, strong torque characteristics, and compliance with emissions
regulations.
With a closed-center hydraulic system,
planetary axles, and a comfortable operator cab equipped with intuitive
controls, the TH408D is designed to deliver consistent power,
durability, and operator confidence.
The engine powering the TH408D is part of Caterpillar’s
proven ACERT diesel engine series, engineered for long life, easy maintenance,
and responsive power. The machine offers two variants of the Cat C4.4 ACERT
engine.
Engine characteristics:
- Model options: Cat C4.4 ACERT (Standard), Cat C4.4 ACERT (Option 1)
- Gross power ratings: 74.5 kW (100 hp) for the standard version, 96.5 kW (129
hp) for the higher-output version
- Maximum torque: 410 Nm (302 lb-ft) for standard engine, 514 Nm (379 lb-ft) for
high-output model
- Emissions level: EU Stage IIIA equivalent
- Engine type: 4-cylinder, turbocharged diesel
- Cooling: heavy-duty liquid cooling system with belt-driven water pump
- Fuel system: high-pressure injection with electronically managed delivery
- Starting and charging: 12-volt electrical system with 150-amp alternator
The Cat C4.4 engine provides consistent torque delivery across a wide RPM range,
essential for telehandler operations where lifting, pushing, and climbing often
occur simultaneously. The design emphasizes reliability, fuel economy, and ease
of service access.
The TH408D is equipped with a durable power shift
transmission designed to manage variable loads and provide smooth directional
changes.
Transmission specifications: Transmission type: 4-speed power shift. The power
shift transmission enables rapid gear selection through hydraulic clutch packs,
reducing operator fatigue in high-cycle loading work.
Forward travel speeds:
- 1st gear: 6.7 km/h (4.2 mph)
- 2nd gear: 13.1 km/h (8.1 mph)
- 3rd gear: 19.3 km/h (12.0 mph)
- 4th gear: 29.1 km/h (18.1 mph)
Reverse travel speeds:
- 1st gear: 6.7 km/h (4.2 mph)
- 2nd gear: 13.1 km/h (8.1 mph)
- 3rd gear: 29.1 km/h (18.1 mph)
Axle and traction system:
- Front axle: high-bias limited-slip differential with planetary reduction hubs
- Rear axle: open differential with planetary reduction hubs
- Axle oscillation provides stability on uneven terrain
- Rear-wheel steering design for improved turning radius
Braking system:
- Service brakes: boost-assisted, oil-immersed multi-disc brakes on both axles
- Parking brake: mechanically actuated, located on front axle service brake
assembly
The electrical system is simple, reliable, and designed
for agricultural and construction environments with high vibration and dust
exposure.
Electrical specifications:
- Battery: 1 x 12-volt, 1000 CCA
- Alternator output: 12V / 150A
- Cab lighting options: multiple work lights, including optional boom-mounted
lighting
- Engine management electronics control fuel delivery, diagnostics, and
cold-start performance
The TH408D maintains a sturdy, fully welded steel frame
designed to withstand high torsional forces during heavy lifting and traveling
over uneven ground.
Drive configuration:
- Two-wheel front drive under normal operation
- Rear-axle steering
Standard tire specification: 15.5/80-24 16-ply industrial tires
Optional tires include:
- Michelin XHA variants
- Large-profile agricultural and industrial tires
- Solid tires for puncture-resistant applications
These options allow the machine to be configured for farms, construction sites,
warehouses, or industrial solids yards.
The TH408D features hydrostatic power steering routed through the rear axle.
This provides responsive steering, tight turning capability, and precise
operator control.
Turning radius:
- Outside radius over tires: 3.85 m (12.6 ft)
- Outside radius over forks: 4.53 m (14.9 ft)
The steering geometry ensures excellent control for stacking materials in
confined barns, storage sheds, and loading areas.
The TH408D uses a load-sensing, closed-center hydraulic
system that adjusts pump output based on operator demand, improving fuel
efficiency and system responsiveness.
Hydraulic specifications:
- Pump type: variable-flow axial piston
- Maximum pump capacity: 140 L/min (36.9 gal/min)
- Maximum system pressure: 260 bar (3,770 psi)
- Auxiliary hydraulic pressure: 245 bar (3,553 psi)
- Hydraulic oil tank: 120 L (31.7 gal)
Auxiliary flows:
- Boom head flow (intermittent): 95 L/min
- Boom head flow (continuous): 95 L/min
- Rear auxiliary service: 80 L/min
Hydraulic functions include boom lift, telescope, crowd/dump, auxiliary tool
operation, and precise load control. The valve system allows two or more
hydraulic functions to be used simultaneously.
Breakout forces:
- Boom breakout force: 46 kN (10,340 lbf)
- Bucket breakout force: 72 kN (16,180 lbf)
Cycle times:
- Boom lift: 7.2 seconds
- Boom lower: 5.5 seconds
- Telescope out: 6.0 seconds
- Telescope in: 5.3 seconds
- Crowd forward (dump): 3.5 seconds
- Crowd backward: 2.9 seconds
- Combined lift and extend: 10.7 seconds
- Combined retract and lower: 8.7 seconds
- Rated load capacity: 4,000 kg (8,818 lb)
- Maximum lift height: 7.6 m (24.9 ft)
- Load at max lift height: 2,025 kg (4,464 lb)
- Maximum forward reach: 4.3 m (14.1 ft)
- Load at maximum forward reach: 1,400 kg (3,086 lb)
- Drawbar pull (83 kW engine): 92 kN
- Drawbar pull (92.6 kW engine): 88 kN
- Drawbar pull (106 kW engine): 97 kN
- Overall length to carriage: 5,286 mm (208.1 in)
- Overall width (standard tires): 2,382 mm (93.8 in)
- Overall height: 2,475 mm (97.4 in)
- Wheelbase: 3,165 mm (124.6 in)
- Ground clearance: 430 mm (16.9 in)
- Outside turning radius: 3.85 m (12.6 ft)
- Track width: 1,988 mm (78.2 in)
- Boom retracted machine length: 5,260 mm (207.1 in)
- Departure angle: 60 degrees
- Standard fork length: 1,200 mm (47 in)
- Maximum fork crowd angle: 24°
- Maximum fork dump angle: 128°
- Operating weight (with forks): 8,383 kg (18,482 lb)
Service intervals (Cat D-Series telehandlers):
- Engine oil and filter: every 250 operating hours
- Hydraulic oil filters: every 500 hours
- Transmission fluid and filters: every 1,000 hours
- Axle oil: every 1,000 hours
- Hydraulic oil: every 2,000 hours
- Cooling system service: every 2 years or 2,000 hours
- Boom and frame lubrication: every 50 hours
- Structural inspection of boom and chassis: during major services
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