7N7748 Turbocharger for Caterpillar CAT Bulldozer D6D D6G D6H

7N7748 3LM Turbocharger for Caterpillar 3306 3306B Engine

The 7N7748 / 7N-7748 3LM turbocharger is supplied for Caterpillar 3306 and 3306B diesel engine applications. It is commonly checked for CAT D6D, D6G, D6H, 140G, 14G, 966C and related heavy equipment engine repair. This turbocharger helps restore boost pressure, air intake volume and engine output when the original turbocharger is worn, leaking oil, noisy or no longer building stable boost.

This page should be used for buyers who are matching the old turbocharger by part number, engine model and physical sample. Because Caterpillar 3306 turbocharger arrangements can vary by machine type and service history, the old turbocharger nameplate and removed sample photos should be checked before order confirmation.

Core Product Signal

Part Number: 7N7748 / 7N-7748

Ref Cross: 0R-5807 / 0R5807 / 310135 / 184119 / 172495

Turbo Model: 3LM / 3LM-373 series turbocharger

Engine Model: Caterpillar 3306 / 3306B diesel engine

Main Application: CAT D6D / D6G / D6H track-type tractor

Related Application: CAT 140G, 14G, 966C and related 3306 engine applications, verify by old turbo tag and sample photos

Buyer Fitment Check

For Caterpillar 3306 and 3306B applications, the safest matching method is to check the old turbocharger number first, then confirm the engine model and machine application. Machine model alone is not enough for final matching because the same engine family may use different compressor housing, turbine housing, flange and oil line arrangements.

Machine Check: Confirm D6D, D6G, D6H, 140G, 14G, 966C or the actual equipment model from the buyer.

Engine Check: Confirm Caterpillar 3306 or 3306B from the engine plate or service record.

Turbo Tag Check: Check for 7N7748, 7N-7748, 0R-5807, 0R5807 or 3LM on the old turbocharger tag.

Housing Check: Compare compressor housing, turbine housing, exhaust flange, outlet direction and mounting layout.

Oil Line Check: Confirm oil inlet, oil outlet, pipe position and return line direction.

Photo Check: Provide clear photos of the turbo nameplate, compressor side, turbine side and mounting side before quotation.

When to Replace the 7N7748 Turbocharger

A worn 7N7748 turbocharger can cause weak boost, black smoke, slow engine response, oil leakage, abnormal turbo noise, damaged compressor wheel or excessive shaft play. Before replacing the turbocharger, the air intake, exhaust and lubrication systems should be inspected together.

Weak Boost: Check intake leakage, compressor wheel damage, exhaust restriction and boost pipe condition.

Black Smoke: Check air filter restriction, low boost pressure, intake pipe leakage and fuel injection condition.

Oil Leakage: Check oil feed line, oil return line, crankcase ventilation and bearing wear before replacing the turbocharger.

Abnormal Noise: Check shaft play, compressor wheel contact, turbine wheel damage and foreign object impact.

Repeat Failure: Check dirty oil, blocked oil return, air filter sealing and exhaust leakage before installing the new turbocharger.

Installation Check Before Startup

Before installing the replacement turbocharger, clean the intake pipe, exhaust connection and oil line area. Remove old gasket material, carbon deposits and loose debris that may enter the turbocharger.

Prime the turbocharger with clean engine oil before first startup. After installation, let the engine idle briefly and check oil leakage, exhaust leakage, abnormal turbo sound, smoke, boost response and oil pressure before heavy-load operation.

FAQ

Is 7N7748 the main part number for this product?

Yes. 7N7748 / 7N-7748 is the main part number for this Caterpillar 3306 and 3306B turbocharger direction.

Can 0R-5807 be used as Ref Cross?

Yes. 0R-5807 / 0R5807 can be used as a Ref Cross reference for this 7N7748 turbocharger direction. Final matching should still be confirmed by the old turbocharger tag and sample photos.

Is this turbocharger for Caterpillar 3306 engine?

Yes. This turbocharger is commonly checked for Caterpillar 3306 and 3306B engine applications. Please confirm the old turbocharger number and engine plate before ordering.

Can this turbocharger be checked for D6D, D6G or D6H?

Yes. It can be checked for CAT D6D, D6G and D6H applications when the old turbocharger tag, engine model and sample photos match this 7N7748 / 0R-5807 direction.

What should I provide before ordering?

Please provide the old turbocharger part number, turbo nameplate photo, engine model, equipment model and clear photos of the removed turbocharger.