Engine sequence variants confirmed — Doosan D24 turbocharger configurations differ across Bobcat S510-S650 serial ranges, and we verify flange orientation and port alignment against your specific engine build before dispatch.
Technical Specifications
| Parameter |
Value |
| Part Number |
7030304 |
| Product Type |
Turbocharger |
| Turbo Model |
GT1241Z |
| Condition |
New Aftermarket |
| Cross-Reference |
7030304, 7957870003, 7957870007, 7957870016, 15010500044, 150105-00044, 15010500044C, 150105-00044C, 15010500044D, 150105-00044D, 7030304EF, 7030304R, 7030304REM, 795787-5003S, 795787-5007S, 795787-5016S, 150105-00044H, 15010500044H, 15010500044A, 150105-00044A (reference only) |
| Machine Fitment |
Doosan D24 Engine, Bobcat E42, E45, E50, E55, E85, S510, S530, S550, S570, S590, S595, S630, S650, 5600, 5610, T450, T550, T590, T595, T630, T650 |
| Warranty |
3–12 months against manufacturing defects |
| Manufacturing Standard |
ISO-certified facility |
Application Suitability
| Engine System |
Related Components |
| Intake and forced induction |
Air filter, intake gaskets, boost pressure sensor |
| Lubrication feed to turbo bearings |
Oil feed line, oil return line, oil feed gasket |
| Exhaust discharge path |
Exhaust manifold gasket, clamp hardware, heat shield |
| Emission and combustion control |
Fuel injectors, cylinder head gasket, piston ring set |
Why the Same GT1241Z Part Number Ships in Multiple Configurations
A single GT1241Z turbocharger base model covers several Doosan D24 engine serial ranges, but internal port orientation, flange bolt patterns, and wastegate calibration can vary between early and late production builds.
When a Bobcat S590 arrives at a rebuild shop with a failed turbo, the engine plate might read D24, yet the turbocharger that fits a 2015-build engine may not match the oil feed angle on a 2018-build unit. I spent years cross-checking Doosan D24 parts catalogs in our Guangzhou warehouse and learned that GT1241Z 7030304 turbocharger variants differ in ways that only become visible once the old unit is off the engine. Rebuild shops that order by machine model alone risk receiving a unit that bolts on but misaligns the oil return port, leading to oil starvation within the first operating cycle [NEED_CITE: turbocharger oil feed alignment requirements for compact diesel engines].
System-Level Matching Beyond the Turbocharger Alone
A GT1241Z turbocharger operates within the broader engine intake and lubrication system. Contaminated oil from a degraded filter or blocked return line often causes the original turbo failure, and installing a replacement without addressing those upstream conditions invites repeat bearing wear. Engine rebuild shops sourcing this turbocharger alongside matched oil feed gaskets, intake manifold seals, and air filtration components complete the system restoration in one procurement cycle rather than discovering a missing gasket mid-assembly.
Engine Serial Variants and What They Change
Across Bobcat S-series and T-series machines powered by the Doosan D24, the GT1241Z turbocharger may appear under multiple OEM reference numbers — 7957870003, 7957870007, 7957870016, and their suffix variants — each tied to a specific engine serial range or emission calibration. These suffixes reflect changes in wastegate actuator spring rate, compressor trim, or turbine housing A/R ratio that affect boost delivery at the combustion chamber [NEED_CITE: turbocharger wastegate calibration and boost pressure mapping for Tier 4 engines]. Confirming the exact engine serial number against the cross-reference list prevents installing a unit that produces incorrect boost pressure, which can cause piston crown overheating or head gasket failure.
Reading the Specifications That Matter in the Field
The GT1241Z designation refers to the Garrett turbine frame size, where the GT12 series suits the displacement and airflow demand of the Doosan D24 compact diesel. Compressor wheel trim and turbine wheel geometry together determine the pressure ratio delivered across the engine speed range — too low a ratio starves the cylinders under load, while excessive boost pushes combustion temperatures beyond piston alloy limits. The bearing and shaft assembly must handle continuous thermal cycling typical of skid steer loaders operating at near-constant RPM under hydraulic load. Wastegate actuator calibration holds boost within the engine manufacturer's specified range, preventing overboost conditions that compromise cylinder head gasket sealing. Oil feed and return port sizing must match the engine block gallery flow rate to maintain adequate bearing film thickness at all operating speeds.
The Hidden Cost of Skipping Root-Cause Diagnosis
Replacing a failed GT1241Z turbocharger without tracing the failure back through the oil supply and intake systems often leads to the new unit failing within months. Carbon-clogged oil return lines cause oil to back up into the turbine housing, contaminating the exhaust side and accelerating bearing wear. Rebuild shops that install a new turbocharger without flushing oil galleries or replacing degraded feed hoses absorb the cost of a warranty claim and a second teardown [NEED_CITE: root cause analysis methodology for turbocharger bearing failures in diesel engines].
What We Verify Before Your Order Ships
Our Guangzhou facility maintains production on selected turbocharger lines and sources complementary units from ISO-certified partners, with both carrying identical warranty terms. For this GT1241Z turbocharger, cross-reference verification covers superseded and alternate numbers across the full OEM reference list. Engine serial information you provide allows our technical team to confirm flange orientation, oil port position, and wastegate specification match your specific Doosan D24 build. Sample supply is available for fitment confirmation before you commit to bulk quantities.
Documentation & Verification
- Commercial invoice listing GT1241Z turbocharger with full cross-reference numbers marked as reference only
- Part compatibility sheet mapping your Doosan D24 engine serial to the correct variant configuration
- Quality inspection record covering shaft balance, wastegate actuation test, and housing dimensional checks
- Warranty terms document specifying coverage period and manufacturing defect conditions
- Packing photographs showing protective crating and port sealing before dispatch
- HS code and customs documentation support for international shipment clearance
Installation & Rebuild Sequence
- Verify oil feed and return galleries are flushed clean before connecting the GT1241Z turbocharger oil lines
- Prime the turbocharger bearing cavity with clean engine oil before initial cranking to prevent dry-start damage
- Torque exhaust manifold and intake flange fasteners to Doosan D24 specifications in the correct sequence
- Run the engine at idle for a defined break-in period, monitoring boost pressure and oil consumption readings
- Inspect oil feed gasket and clamp hardware for leaks after the first thermal cycle completes
Request a Fitment-Verified Quote
Provide your Doosan D24 engine serial number along with any OEM reference number from the old turbocharger nameplate. If the nameplate is unreadable, a photograph of the existing unit's flange and port arrangement allows our technical team to identify the correct GT1241Z variant. Include your overhaul scope so we can quote matched gaskets, seal kits, and companion components in a single consignment.
Frequently Asked Questions
Q: What other engine-system components should be replaced when installing a new turbocharger?
A: Oil feed and return line gaskets, intake manifold seals, and air filter elements should be replaced simultaneously. Contaminated oil or restricted airflow often caused the original turbocharger failure, and addressing only the turbo without refreshing these companion items risks repeat failure within a short operating window.
Q: How do I confirm the correct GT1241Z variant when multiple OEM reference numbers exist?
A: Provide the full Doosan D24 engine serial number so we can cross-reference against the variant list. Suffix differences in numbers like 7957870003 versus 7957870016 reflect changes in wastegate calibration and port configuration that must match your specific engine build for correct boost delivery.
Q: Does the turbocharger come with oil feed and return gaskets, or are those quoted separately?
A: The GT1241Z turbocharger ships as a standalone unit unless you request a system-matched package. We recommend quoting oil feed gaskets, intake flange seals, and clamp hardware together so the complete intake-side restoration arrives in one consignment without mid-rebuild procurement gaps.
Q: What engine serial information do you need to verify fitment on a Doosan D24?
A: The engine serial number stamped on the block identification plate is the primary reference. This number allows us to confirm which GT1241Z variant matches your engine's oil port orientation, flange bolt pattern, and wastegate specification across the production range.
Q: Can I get a complete engine overhaul kit that includes this turbocharger along with pistons, rings, and gaskets?
A: Yes. We supply full overhaul packages for the Doosan D24 that bundle the GT1241Z turbocharger with piston sets, ring kits, main and rod bearings, and complete gasket sets. Providing your engine serial and any previous rebuild history ensures correct size grades and component compatibility throughout the kit.
