Used Caterpillar D4HBulldozer

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📌 Overview

Item	Details
Manufacturer	Caterpillar Inc.
Model	D4H
Series	D4 Series (Medium-sized Crawler Tractor)
Production Years	1976 – 1982
Predecessor	D4G
Successor	D5H (later evolved into D5N/D5R)
Primary Use	Construction, road building, land clearing, site prep, utility work

The D4H was one of Caterpillar's most popular medium-sized dozers of the late 1970s and early 1980s. It was an upgraded version of the D4G, featuring a more powerful turbocharged engine, improved hydraulics, and better operator comfort.

🔧 Engine Specifications

Specification	Details
Engine Model	Caterpillar 3046
Type	6-cylinder, in-line, turbocharged diesel
Displacement	304 cu in (4.98 liters)
Gross Power	~95–105 HP (71–78 kW) @ 2,200 RPM
Flywheel Power	~88 HP (66 kW)
Fuel System	Direct injection
Air Filter	Dry-type with pre-cleaner
Cooling	Water-cooled with radiator

✅ The turbocharged 3046 engine was a major upgrade over the naturally aspirated engine in the D4G, giving the D4H significantly more power and torque.

⚙️ Transmission & Drivetrain

Feature	Details
Transmission Type	Power Shift (no clutch pedal)
Forward Speeds	6 speeds
Reverse Speeds	2 speeds
Top Forward Speed	~7.0 mph (11.3 km/h)
Top Reverse Speed	~8.0 mph (12.9 km/h)
Final Drive	Planetary

The power shift transmission made operation much easier compared to older clutch-shift models — operators simply moved levers without using a clutch.

📐 Dimensions & Weight

Specification	Details
Operating Weight	~18,788 lbs (8,522 kg)
Length (with S-blade)	16' 6" (5,029 mm)
Width (over tracks)	9' 6" (2,896 mm)
Height (to ROPS top)	9' 7" (2,921 mm)
Ground Clearance	1' 5" (432 mm)
Track Width	15.5" (394 mm) shoes
Track Length (ground contact)	~8' 2" (2,489 mm)

🔨 Blade & Attachments

Blade Type	Capacity	Width
Straight Blade (S-Blade)	3.63 cu yd (2.77 m³)	11' 4" (3,454 mm)
Universal Blade (U-Blade)	3.52 cu yd (2.69 m³)	12' 0" (3,658 mm)
Ripper (Single Shank)	—	12" (305 mm) penetration

Feature	Details
Hydraulic Flow	17.8 GPM (67.4 LPM)
System Pressure	2,300 PSI (15,860 kPa)
Lift Capacity (at pin)	~9,200 lbs (4,173 kg)
Blade Tilt	Hydraulic (side tilt & angle)

🪑 Operator Station & Comfort

Feature	Details
Cab	Enclosed ROPS/FOPS certified cab
Seat	Suspended, adjustable
Controls	Levers (push-pull) for blade & ripper
Visibility	Good all-around visibility
Noise Level	~93 dB(A) (with cab)
Air Conditioning	Available as option
Heater	Standard

💪 Performance Highlights

Capability	Value
Maximum Drawbar Pull	~17,000 lbs (7,711 kg)
Gradeability	~60% (31°)
Ripping Depth (single shank)	~12" (305 mm)
Fuel Capacity	~40–50 gallons (151–189 liters)
Fuel Consumption	~3–5 GPH (11–19 LPH) depending on load

🆚 D4H vs D4G (Key Improvements)

Feature	D4G (older)	D4H (upgraded)
Engine	Naturally aspirated	Turbocharged 3046
Power	~80 HP	~95–105 HP
Transmission	Clutch shift	Power shift
Hydraulics	Lower flow	17.8 GPM (upgraded)
Operator Comfort	Basic	Improved ROPS cab, AC option
Production	1963–1976	1976–1982

🌍 Applications

Industry	Use
🏗️ Construction	Site grading, excavation support
🛣️ Road Building	Road construction, base material spreading
🌲 Land Clearing	Brush clearing, tree pushing
⚡ Utilities	Pipeline trenching, right-of-way clearing
🏔️ Mining	Light mining, stockpile management
🏢 Demolition	Building push-down, debris moving

📝 Summary

✅ Strengths	⚠️ Limitations
Reliable Cat 3046 turbo engine	No longer in production (parts availability declining)
Power shift = easy to operate	Smaller than modern D5/D6 class dozers
Good power-to-weight ratio	Older technology (no GPS, no electronic monitoring)
Strong blade & ripper capacity	Higher fuel consumption vs modern models
Excellent parts commonality with D4 series	~40+ years old — age-related wear

🔑 Key Takeaway

The Caterpillar D4H is considered a classic workhorse of the 1970s–80s construction era. With its ~95–105 HP turbocharged engine, power shift transmission, and reliable hydraulic system, it was one of the most versatile medium dozers of its time. Many are still in service today (especially in developing countries), thanks to Caterpillar's legendary durability and the vast availability of aftermarket parts.

Would you like me to go deeper into any specific area — such as maintenance, common problems, market value today, or comparison with D5H/D6H? 🚜