Case 1150B Crawler Dozer: Specs, Parts & Common Issues
Produced 1973 – 1984, the Case 1150B is the B-generation large-frame Case crawler dozer — Case A451B inline six-cylinder diesel, power shift transmission with torque converter, and a chassis refinement of the original 1150 with substantial improvements to operator station, hydraulics, and accessory packaging. The 11-year production run makes the 1150B one of the most widely deployed pre-G-generation large-class Case dozers in the field today.
The Case 1150B Crawler Dozer is the B-generation large-frame Case crawler dozer, produced from 1973 through 1984 — an 11-year production run that makes it one of the most widely deployed pre-G-generation large-class Case dozers in the used market today. The 1150B is the direct successor to the original Case 1150 and refines that machine's chassis, controls, and accessory packaging while retaining the proven Case A451B inline six-cylinder diesel engine. The B-generation introduced improved operator station, refined hydraulics, and updated accessory packaging.
For owners and operators today, the 1150B sits in a productive sweet spot: a 1970s/early-1980s large-frame Case dozer with a proven engine (the Case A451B is well-documented and well-supported), a power shift drivetrain with torque converter, and broad parts availability across the 1150 family.
At-a-glance specifications
Case 1150B — factory specifications
- Production years
- 1973 – 1984
- Predecessor
- Case 1150 (original, late 1960s–early 1970s)
- Successor
- Case 1150C (1978 – 1983) and 1150D (1983 – 1990)
- Engine
- Case A451B inline 6-cylinder diesel
- Displacement
- 451 cu in (~7.4 L)
- Power
- ~105 – 115 horsepower flywheel (configuration dependent)
- Transmission
- Power shift with torque converter
- Hydraulics
- Open-center implement circuit (refined relative to original 1150)
- Variants
- Standard, LGP (Low Ground Pressure)
- Operating weight
- ~27,500 – 30,500 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 1150B differs from the original 1150
- Refined operator station — improved ROPS canopy, updated control layout, better visibility, refined seat mount.
- Updated hydraulic system — refined open-center implement hydraulics with improved valve response.
- Updated accessory packaging — alternator, starter, and accessory belt routing updated.
- Same Case A451B 6-cyl engine — engine architecture unchanged from the original 1150, providing parts continuity. Approximately 105–115 HP flywheel depending on configuration.
- Power shift with torque converter standardized — torque converter provides smoother power transfer to the tracks under load.
Case A451B inline 6-cylinder engine
The 1150B continues the Case A451B inline six-cylinder diesel engine from the original 1150. The A451 series is the larger Case 6-cyl diesel of the 1970s and early 1980s — 451 cubic inches of displacement (approximately 7.4 liters), inline naturally aspirated configuration. Used across multiple larger Case industrial applications of the era.
The A451B engine ecosystem is broad — accessory parts (water pump, alternator, starter, oil pump) share with other Case industrial 6-cyl applications of the era. Injection pump and injector service is well-documented. Cylinder kits, bearings, and complete engine overhaul parts are available through both Case dealer and aftermarket diesel-engine specialists. Browse the Case Dozer Parts hub for current 1150B engine service kits.
Power shift transmission with torque converter
The 1150B uses a power shift transmission with torque converter — clutchless gear changes under load, multiple forward and reverse speeds, torque converter providing smooth power transfer. Power shift was the standard configuration on 1150B production and is the same transmission family used on the 1150C, 1150D, and 1150E successors. Routine service items include shift solenoids and pressure switches, clutch packs, the torque converter, transmission oil cooler, and the transmission filter.
The torque converter is a routine rebuild item on high-hour 1150Bs and is often paired with a transmission filter change at the same service interval.
Undercarriage
The 1150B undercarriage shares component heritage with the original 1150 and the 1150C / 1150D successors. Sprocket bolt patterns, idler geometries, and master pin dimensions 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, and most field-service 1150Bs have seen multiple full undercarriage rebuilds.
Browse the Case Dozer Parts hub for current 1150B-era undercarriage availability.
Blade system and hydraulics
The 1150B ships with a 6-way bulldozer blade — angle and tilt control hydraulically actuated. Larger blade than the 850-class machines below. Blade cylinders, blade-carrier slider blocks, and cutting edges are routine service items. Cutting edge replacement is generally needed every few hundred to few thousand hours of dozing depending on material and operator habit.
Hydraulic implement-circuit pressure is moderate by modern standards — open-center hydraulic systems were standard in this era. Seal kit availability for the blade cylinders is generally good, with aftermarket kits supporting most 1150B-era cylinder dimensions.
Variants: Standard, LGP
The 1150B 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.
Track configuration affects undercarriage and frame parts. Confirm Standard vs. LGP by serial before ordering.
Common 1150B service items
Engine accessory aging
Water pump, alternator, starter, and injection pump on the A451B are routinely rebuilt or replaced over the engine's service life. Cooling system service (radiator core flush or replacement, fan belt, hose set) is a routine maintenance milestone on 40-plus-year-old machines.
Power shift / torque converter service
Shift solenoid failure, clutch pack wear, torque converter degradation, and transmission oil cooler service are routine items at production-run age. The transmission filter and fluid should be on a scheduled service interval — most experienced operators recommend more frequent change-out than the original service manual called for, particularly on high-hour machines.
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
40-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 1150B
| Component area | What to look for | Notes |
|---|---|---|
| Sprockets & segments | Track sprocket assemblies, bolt-on segments | Cross-fits 1150 / 1150C / 1150D 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 | Water pump, alternator, starter, fuel injection | Case A451B accessories share parts with other Case industrial 6-cyl 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 | Filter kits packaged by application speed routine service. |
| Power shift transmission parts | Shift solenoids, clutch packs, oil cooler, torque converter | Cross-fit with the 1150 / 1150C / 1150D power shift family. |
| Operator seat | Universal industrial seat with mount kit | Universal Case industrial seats fit the 1150B operator station with standard mount kits. |
For 1150B-era parts inventory and cross-fit confirmation, browse the Case Dozer Parts hub or contact our parts desk directly.
Working on a Case 1150B?
The 1150B is an 11-year-production large-frame machine with broad parts cross-fit across the 1150 family. Our specialists can verify Standard vs. LGP fitment by serial and walk you through the 1150 family's cross-fit options.
Mon – Fri, 7:00 AM – 5:00 PM CT
Request a PartWhy the 1150B is still in service
The 1150B sits in a productive niche for large-class dozer work — substantial pushing power and stability for major dirt work, road maintenance, and large-acreage land-clearing. The Case A451B six-cylinder diesel is well-documented and well-supported. The power shift drivetrain with torque converter is simpler to troubleshoot in the field than the hydrostatic systems on the later 1150K / L / M generations. For commercial dirt work, large agricultural site prep, and major land-clearing operations, a 1150B in good mechanical condition remains a productive machine.
