Case 1150D Crawler Dozer: Specs, Parts & Common Issues
Produced 1983 - 1990, the Case 1150D is the D-generation large-frame Case crawler dozer - Case 6-cylinder diesel, power shift transmission with torque converter, and substantially refined operator station and electronics over the 1150B / 1150C predecessors. The 1150D's seven-year production run made it one of the most widely deployed large-frame Case dozers of the late 1980s.
The Case 1150D Crawler Dozer is the D-generation large-frame Case crawler dozer, produced from 1983 through 1990. The 1150D is the successor to the 1150B and 1150C and represents a substantial refresh of the 1150 platform: updated operator station, refined controls, improved hydraulic valving, and continued evolution of the Case 6-cylinder diesel and power shift transmission with torque converter. Production overlapped with the 1150B's final years and predated the 1150E Long Track variant and 1150G mid-1990s refresh.
For owners and operators today, the 1150D is one of the most refined pre-G-generation large-frame Case dozers. The proven Case A451 / 6-590 engine lineage, the well-developed power shift drivetrain, and the broad parts cross-fit with the 1150B / 1150C and 1150E make the 1150D one of the most practical large-frame Case dozers in the used market.
At-a-glance specifications
Case 1150D - factory specifications
- Production years
- 1983 - 1990
- Predecessor
- Case 1150C (1978 - 1983) and 1150B (1973 - 1984)
- Successor
- Case 1150E (Long Track variant) and 1150G (mid-1990s)
- Engine
- Case A451 / Case 6-590 inline 6-cylinder diesel (Cummins 6BT-derived late production)
- Displacement
- 451 cu in (~7.4 L) - A451; 359 cu in (5.9 L) - late 6-590
- Power
- ~115 - 130 horsepower flywheel (configuration dependent)
- Transmission
- Power shift with torque converter
- Hydraulics
- Open-center implement circuit (refined relative to 1150C)
- Variants
- Standard, LGP (Low Ground Pressure)
- Operating weight
- ~28,500 - 32,000 lb depending on configuration
- Blade
- 6-way bulldozer blade - angle and tilt blade options
- Serial plate location
- Right side of operator's platform / chassis frame
How the 1150D differs from the 1150C predecessor
- Refreshed operator station - substantially updated ROPS canopy, improved control layout, refined gauge cluster, better seat mount and operator ergonomics.
- Updated hydraulic system - refined open-center implement hydraulics with improved valve response.
- Engine evolution - early-production 1150Ds continue the Case A451 engine; later-production units transition to the Case 6-590 (Cummins 6BT-derived) inline six-cylinder for the broader Cummins industrial parts ecosystem.
- Updated accessory packaging - alternator, starter, and accessory belt routing refined.
- Same power shift drivetrain - power shift with torque converter unchanged from the 1150C for parts continuity.
Engine: Case A451 to Case 6-590 transition
The 1150D's seven-year production saw the gradual transition from the Case A451 inline six-cylinder to the Case 6-590 (Cummins 6BT-derived inline six-cylinder, 5.9 L). Early-production 1150Ds inherit the A451 engine from the 1150C; later-production units use the Cummins 6BT-derived 6-590 for broader parts ecosystem support.
The Cummins 6BT family is one of the most widely produced industrial / commercial diesel engines in history, used across Case construction equipment, Cummins industrial applications, medium-duty trucks (Dodge Ram), and agricultural machinery. For late-production 1150D owners, the 6BT parts ecosystem is a significant practical advantage compared to the A451 engine.
Always confirm your 1150D's engine designation by engine plate before ordering engine-specific parts. Browse the Case Dozer Parts hub for current 1150D engine service kits.
Power shift transmission with torque converter
The 1150D uses the same power shift with torque converter as the 1150C. Clutchless gear changes under load, multiple forward and reverse speeds, torque converter providing smooth power transfer. Routine service items: shift solenoids and pressure switches, clutch packs, torque converter, transmission oil cooler, transmission filter.
The torque converter is a routine rebuild item on high-hour 1150Ds and is often paired with a transmission filter change at the same service interval.
Undercarriage
The 1150D undercarriage shares broad cross-fit with the 1150B / 1150C / 1150E family. Sprocket bolt patterns, idler geometries, master pin dimensions, and roller designs cross-fit on multiple components - confirm by part number against your serial. Track chain, roller, idler, and sprocket are all routine wear items at production-run age.
Browse the Case Dozer Parts hub for current 1150D-era undercarriage availability.
Blade system and hydraulics
The 1150D ships with a 6-way bulldozer blade - angle and tilt control hydraulically actuated. Blade cylinders, blade-carrier slider blocks, and cutting edges are routine service items.
The 1150D introduced refined hydraulic valving relative to the 1150C - improved valve response. Seal kit availability for the blade cylinders is generally good, with aftermarket kits supporting most 1150D-era cylinder dimensions.
Variants: Standard, LGP
The 1150D shipped in two primary track configurations:
- Standard - standard-width track, balanced general dozing.
- LGP (Low Ground Pressure) - wider grouser pads and extended track frame for soft-ground / wetlands / agricultural-soil work.
The Long Track variant became the dedicated Case 1150E Long Track machine following the 1150D.
Common 1150D service items
Engine accessory aging
Water pump, alternator, starter, and injection pump on the A451 or 6-590 are routinely rebuilt or replaced over the engine's service life. The Cummins 6BT-derived 6-590 (late production) has the broader parts ecosystem advantage.
Power shift / torque converter service
Shift solenoid failure, clutch pack wear, torque converter degradation, transmission oil cooler service. The transmission filter and fluid should be on a scheduled service interval.
Hydraulic seal failure
Blade cylinder seal failures are common at this age. Cylinder rod chrome corrosion and seal weep are typical symptoms. Seal kit rebuilds address most cases; severe rod corrosion requires rod replacement.
Undercarriage replacement cycles
Track chains, rollers, idlers, and sprockets all have measurable wear lives. Modern aftermarket undercarriage is available for the 1150 family.
Operator station and ROPS
Cab and canopy hardware, seat cushion replacement, and floorboard wear are typical aging-machine issues. ROPS structural integrity should be verified before resale.
Wiring and electrical
30-plus-year-old wiring harnesses are routinely brittle. Hard starts, intermittent gauges, and dim lights are often traced to harness corrosion or insulation failure rather than the underlying component.
Parts and cross-fit components for the Case 1150D
| Component area | What to look for | Notes |
|---|---|---|
| Sprockets & segments | Track sprocket assemblies, bolt-on segments | Cross-fits 1150B / 1150C / 1150E family on shared bolt patterns. |
| Idlers & rollers | Front idler assemblies, top and bottom roller sets | Cross-fits the 1150 large-class undercarriage. |
| Track recoil & adjusters | Recoil spring, adjuster yoke, chrome rod | Confirm by serial - production-run changes apply. |
| Master pins | Track master pin and bushing | Master pins share geometry across the 1150 family. |
| Cutting edges & end bits | Standard and severe-duty cutting edges, end bits | Aftermarket cutting edges widely available for the 1150's large blade. |
| Blade cylinder seal kits | Angle, tilt, lift cylinder seal kits | Confirm cylinder dimensions before ordering. |
| Engine accessory parts - early A451 | Water pump, alternator, starter, fuel injection | Case A451 accessories share parts with other Case industrial 6-cyl applications. |
| Engine accessory parts - late 6-590 | Cummins 6BT parts ecosystem | Enormous parts ecosystem from Cummins industrial / commercial / automotive applications. |
| Radiators & cooling | Radiator cores, fan belts, hose sets | Aftermarket radiator and cooling cross-fit available. |
| Filter service kits | Engine oil, fuel, air, hydraulic filter sets | A451 vs 6-590 may require different kits. |
| Power shift transmission parts | Shift solenoids, clutch packs, oil cooler, torque converter | Cross-fit with the 1150B / 1150C / 1150E power shift family. |
| Operator seat | Universal industrial seat with mount kit | Universal Case industrial seats fit the 1150D operator station. |
For 1150D-era parts inventory and cross-fit confirmation, browse the Case Dozer Parts hub or contact our parts desk directly.
Working on a Case 1150D?
The 1150D is the most refined pre-G-generation large-frame Case dozer - early units have the A451 engine; later units have the Cummins 6BT-derived 6-590. Our specialists can verify engine and fitment by serial.
Mon - Fri, 7:00 AM - 5:00 PM CT
Request a PartWhy the 1150D is still in service
The 1150D combines a refined chassis and operator station with the latest evolution of the Case A451 / 6-590 6-cyl diesel and the proven power shift drivetrain. For commercial dirt work, agricultural site prep, road maintenance, and major land-clearing, a 1150D in good mechanical condition remains a productive machine. The Cummins 6BT-derived 6-590 engine on later production has an enormous parts ecosystem, making engine service economical.
