Caterpillarengine - marinemarine engine

Caterpillar D330B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar D330B is a legacy 4-cylinder, 4-stroke diesel engine designed for mid-range power in demanding environments. Primarily utilized in marine auxiliary roles and stationary industrial platforms, this series includes configurations for gen-sets and power units. The D330B features a 4-1/2 inch bore design and was part of a lineage that transitioned from the A-series to the C-series engines. It is recognized for its mechanical simplicity and ability to operate reliably in high-moisture or salt-heavy environments.

Across the series, Caterpillar implemented significant changes, such as moving from integrated water pump/fan drives to separate gear-driven pumps seen in later C-series models. The D330B remains a critical component in the used parts and restoration market due to its robust mechanical design and high demand among specialists looking to preserve pre-electronic machinery. Its ability to be serviced without complex electronic control modules makes it a preferred choice for repower projects and historical equipment maintenance.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar D330B specifications

Engine

ModelD330B (Marine configuration identified by serial prefix 9NS)
ConfigurationInline 4-cylinder, 4-stroke diesel
Net Power125 – 160 HP @ 1,800 – 2,000 RPM
Displacement638 cu in (10.5 L)
Bore x Stroke4.75 in x 6.0 in (121 mm x 152 mm)
AspirationNaturally Aspirated or Turbocharged (model dependent)
Compression Ratio~16:1 (varies by application)
Fuel SystemDirect Injection, Mechanical Fuel Pump
Emissions TierPre-regulation (no emissions aftertreatment)

Weights

Dry WeightApprox. 2,400 – 2,800 lbs (1,090 – 1,270 kg)

Performance

Torque OutputUp to 470 lb-ft (638 Nm)
Governing Speed Range1,200 – 2,000 RPM

Service capacities (summary)

Engine Oil Capacity~5.5 – 6.5 gallons (21 – 25 liters)

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

D330B fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with filter)30.3 L (8.0 US gal) full system; approx. 29.9 L (7.9 US gal) refill at oil-and-filter changeCat DEO (Diesel Engine Oil). SAE 15W-40 multigrade for general service; step down to SAE 10W-30 in cold climates below roughly -18 C (0 F); straight SAE 30 in sustained heat above 30 C (86 F). Select grade from Cat viscosity-by-ambient-temperature chart at start-up.
Cooling system45.0 L (11.9 US gal)Cat DEAC (Diesel Engine Antifreeze/Coolant), full-strength or 50/50 premix with water; Cat ELC (Extended Life Coolant) accepted as a longer-service alternative. Use higher antifreeze concentration in climates colder than about -20 C (-4 F).
Fuel tank560 L (148 US gal) full; approx. 549 L (145 US gal) service refillNo. 2-D diesel fuel (ASTM D975). Switch to No. 1-D or a winter-blend No. 2-D in cold weather to prevent waxing/gelling.
Swing drive15.1 L (4.0 US gal)Cat TDTO (Transmission/Drive Train Oil), meeting Cat TO-4 spec. SAE 30 typical; drop to SAE 10W or a TO-4 multigrade in cold climates.
GreaseCat MPGM (Multipurpose Grease), NLGI 2, for general pin and bushing lubrication. Cat XA (Extreme Application) grease is an alternative for heavy-load swing-bearing and pin service in extreme temperature or duty conditions.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar D330B maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition
  • Verify hydraulic fluid level via sight glass
  • Inspect coolant level and cap integrity
  • Drain water from fuel/water separator
  • Monitor air filter restriction indicator
  • Inspect for external fluid leaks
Every 250 h
  • Change engine oil and filter
  • Grease all pivot points and pins
  • Check air filter primary element
  • Drain fuel water separator
  • Perform visual inspection of belts and hoses
Every 500 h
  • Replace fuel filters
  • Replace hydraulic return filter
  • Conduct battery service and terminal inspection
  • Perform detailed undercarriage inspection
  • Test coolant additive/SCA levels
Every 1,000 h
  • Perform hydraulic oil sample analysis (S.O.S)
  • Inspect turbocharger for wear or leaks
  • Check torque on ROPS bolts
  • Measure undercarriage component wear
  • Clean or replace air filter primary element
Every 2,000 h
  • Change hydraulic system oil
  • Perform full coolant flush and replacement
  • Conduct comprehensive structural inspection of welds
  • Evaluate major engine components
  • Replace worn belts and hoses

Servicing the D330B beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize Cat S.O.S Services to monitor engine oil, hydraulic fluid, and coolant. Analyze oil for wear metals like iron or copper and contaminants such as silicon or sodium. For the D330B marine application, frequent hydraulic oil sampling is vital to detect particle counts or water content that could lead to pump failure. Monitoring coolant pH and SCA levels prevents internal liner pitting and corrosion in the engine block.

Corrective & Common Repairs

Address common mechanical issues such as pre-combustion chamber thread discrepancies or head modifications found in certain serial ranges. Monitor for leaks at the water pump or fan drive assemblies. If metal loading is detected in hydraulic oil via analysis, prepare to reseal or rebuild main hydraulic pumps and cylinders. Ensure all engine components, including gaskets and seals, meet original mechanical specifications to prevent compression loss.

Overhaul & Rebuild Points

Plan major overhauls around the inspection of cylinder liners and counterbores. When performing top-end rebuild s, inspect valves, guides, and springs for wear. For complete in-frame rebuild s, utilize high-quality kits containing pistons, liners, rings, and bearings. Focus on verifying the integrity of the 4-1/2 inch bore components and ensuring all timing gear clearances meet factory specifications to maintain engine timing and performance.

Seasonal & Environment Servicing

In marine environments, prioritize inspections for salt-heavy air damage and moisture ingress. For engines operating in dusty or quarry conditions, shorten air filter inspection intervals and clean radiators daily. During cold weather operations, ensure the use of correct viscosity oil and verify engine block heater functionality. Always check coolant glycol concentration before winter to protect the engine block from freezing and cracking.

D330B common service parts

Part numberPart
1S-9547TransferCheck fitment →
7M-7177Transfer --Filter InstructionCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

D330B attachments & work tools

Marine Auxiliary & Industrial Work Tools

Includes marine gensets, bilge pump drives, air compressor engines, and water pump engines for flood control. These units are utilized in dockyards, inland waterways, and agricultural sectors.

Construction Attachments (D330B Class)

Standard tool families include blades, rippers/scarifiers, and pull-type rippers. Specific configurations for this class also encompass motor graders, scrapers, and track-type tractors.

Mounting & Hydraulic Systems

Marine and industrial versions are available in naturally aspirated, turbocharged, or turbocharged with aftercooler configurations. Some units utilize a separate gear drive water pump depending on the specific series.

Factory Configurations & Guarding

Engine-specific configurations include 4-cylinder, 4-stroke diesel designs with mechanical fuel control systems. Marine and industrial versions are identified by serial number prefixes such as 56B, 57B, 81B, 82B, 85B, and 86B.

All D330B assemblies by section

Every catalogued assembly group for the Caterpillar D330B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Attachments
5l7686 Air Cleaner Group
7l7414 Air Filter Indicator Group
7l6784 Air Filter Indicator Group
5l2130 Air Filter Indicator Group
3l517 Air Motor
5l2233 Air Starting Arrangement
3L***79Fuel Priming Pump Group1
5L***32Air Starting Motor Group1
5L***33Air Starting Arrangement1
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5l2231 Air Starting Motor Assembly
7l8425 Motor Assembly
7l8250 Air Starting Motor Group--Type 2
7l8250 Air Starting Motor Group--Type 1
5l2232 Air Starting Motor Group--15 Horsepower
5l1243 Alternator Assembly--32 Volt, 60 Ampere
5l6468 Alternator Assembly--24 Volt, 60 Ampere
4l7805 Alternator Assembly--12 Volt, 60 Ampere
6l2227 Alternator Group--24 Volt, 60 Ampere
5l6223 Alternator Group--32 Volt, 60 Ampere
6l2226 Alternator Group--12 Volt, 60 Ampere
7l7868 Battery Group--12 Volt, 344 Ampere Hours
7l7871 Battery Group--24 Volt, 172 Ampere Hours--Replaces 9f6028
7L***71Battery Group; (24-Volt)(24-Volt)1
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7l7872 Battery Group--24 Volt, 220 Ampere Hours--Replaces 1h1341
1l5663 Battery Group--30 Volt, 170 Ampere Hours
7l7873 Battery Group--30 Volt, 120 Ampere Hours
7l7867 Battery Group--12 Volt, 240 Ampere Hours
7l7870 Battery Group--24 Volt, 120 Ampere Hours--Replaces 1l5664
1l5664 Battery Group--24 Volt, 120 Ampere Hours
1l5662 Battery Group--30 Volt, 120 Ampere Hours
9f6028 Battery Group--24 Volt, 170 Ampere Hours
7l7869 Battery Group--12 Volt, 440 Ampere Hours
1h1341 Battery Group--24 Volt, 200 Ampere Hours
5l8091 Air Cleaner Cap Group
5L***91Cap Group-Air Cleaner; Air Cleaner Cap Group1
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8l3915 Centrifugal Pump Assembly--Raw Water
2f8223 Clutch Assembly
5l5869 Electric Starting Arrangement--12 Volt
3L***79Fuel Priming Pump Group1
5L***68Motor And Wiring Group1
5L***69Direct Electric Starting Arrangement1
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6l2101 Dual Instrument Panel Group--12 Volt
6l2102 Dual Instrument Panel Group--12 Volt
6l2103 Dual Instrument Panel Group--24 Or 32 Volt
5l7660 Exhaust Elbow Group--4 Inch Dry
7l443 Exhaust Elbow Group--90 Degrees Bend--4 Inch
5l7661 Exhaust Elbow Group--5 Inch Dry
5L***61Elbow Group-Exhaust; Exhaust Elbow Group1
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5l4491 Motor And Wiring Group--32 Volt
5L***91Electric Motor And Wiring Group1
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5l2489 Electric Starting Arrangement--24 Volt
3L***79Fuel Priming Pump Group1
5L***89Electric Starting Arrangement1
5L***90Electric Starting Motor Group1
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5l4492 Electric Starting Arrangement--32 Volt
3L***79Fuel Priming Pump Group1
5L***91Electric Motor And Wiring Group1
5L***92Electric Starting Arrangement1
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5l5867 Motor--12 Volt--Part 1 Of 2
5L***67Electric Starting Motor Assembly1
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5l4513 Electric Starting Motor Assembly--32 Volt--Part 2 Of 2
5L***13Electric Starting Motor Assembly1
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5l5867 Motor--12 Volt--Part 2 Of 2
5L***67Electric Starting Motor Assembly1
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5l4513 Electric Starting Motor Assembly--32 Volt--Part 1 Of 2
5L***13Electric Starting Motor Assembly1
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5l2490 Motor And Wiring Group--24 Volt
8h4681 Primary Fuel Filter Group
8H***81Filter Group-Primary Fuel; Primary Fuel Filter Group1
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5l9377 Exhaust Fitting Group--5 Inch
5L***77Fitting Group-Exhaust; Exhaust Flange Group1
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5l8592 Exhaust Flange Group--4 Inch
3l6641 Flexible Fuel Lines Group
3f4394 Foot Valve And Strainer Assembly
3l4837 Front Auxiliary Drive Group--Crankshaft
5l6260 Front Power Take-Off Group--1 : 1 Ratio--Engine Rotation
3l6579 Fuel Priming Pump Group
8l4309 Fuel System Shield Group
4L***63Nut-Spacer; (3/8-16-Thd)1
6B***33Spacer Engine Support To Adjusting Strap1
7L***41Shield Assembly1
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5l5750 Generator Assembly--12 Volt, 35 Ampere
5l5751 Generator Assembly--32 Volt, 18 Ampere
5l6221 Generator Group--12 Volt, 35 Ampere
5l6222 Generator Group--32 Volt, 18 Ampere
6l6767 Starting Aid Glow Plug Group--12 Volt
6l6769 Starting Aid Glow Plug Group--32 Volt
5l2518 Governor Control Group--R.H.--Positive Locking And Remote Cable
7f6899 Governor Control Group--Pilot House Mounted
4l6811 Governor Control Lever Group--Remote Cable
4L***11Governor Control Lever Group; Governor Control Lever Group Shown Below1
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4l7604 Control Handle Group
4L***04Handle Group-Control; Governor Control Handle Group1
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6l4073 Heat Exchanger Assembly
6l4075 Heat Exchanger Assembly
6l3447 Heat Exchanger Assembly
7l5473 Heat Exchanger Assembly--Remote Mounted
7l5471 Heat Exchanger Assembly--Engine Mounted
5l8660 Horizontal Exhaust Fitting Group--4 Inch
5L***60Horizontal Exhaust Fitting Group1
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4l4612 Instrument Panel Group
6l5947 Jacket Water Aftercooler And Connections Group--Keel Cooling
6L***47Jacket Water Aftercooler And Connections Group1
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4l4984 Ether Starting Aid Kit
5l5868 Motor And Wiring Group--12 Volt
8l8207 Electric Starting Motor Assembly--32 Volt--Part 2 Of 2--Type 1
8l8207 Electric Starting Motor Assembly--32 Volt--Part 1 Of 2--Type 1
8l8207 Electric Starting Motor Assembly--32 Volt--Part 2 Of 2--Type 2
8l8207 Electric Starting Motor Assembly--32 Volt--Part 1 Of 2--Type 2
5l2537 Motor Assembly--24 Volt--Part 1 Of 2
5l2537 Motor Assembly--24 Volt--Part 2 Of 2
5l9773 Oil Filler And Oil Level Gauge Group--R.H.
5l8632 Exhaust Pipe Group--5 Inch
5l8649 Exhaust Pipe Group--4 Inch
8f2184 Centrifugal Pump Group--R.H.
6l5875 Bilge Water Pump--R.H.
6l5861 Bilge Pump Drive Group
6l5858 Bilge Water Pump Group--Small Capacity
6l5397 Regulator Assembly--32 Volt, 60 Ampere
5l7690 Regulator Assembly--32 Volt, 18 Ampere
6l5657 Regulator Assembly--24 Volt, 60 Ampere
5l9879 Safety Contactor Group--Oil Pressure And Water Temperature
6l2691 Stub Shaft Group--Front--Power Take-Off
5l7428 Single Instrument Panel Group--24 Or 32 Volt
5l9892 Single Instrument Panel Group--12 Volt
5l7429 Single Instrument Panel Group--12 Volt
6l1923 Solenoid Shut-Off Group--12 Volt
5l8984 Solenoid Shut-Off Group--24 Volt
6l6768 Starting Aid Glow Plug Group--24 Volt
6l7868 Starting Aid Glow Plug Group--24 Volt
6l7867 Starting Aid Glow Plug Group--12 Volt
6l7869 Starting Aid Glow Plug Group--32 Volt
8f4185 Foot Valve And Strainer Assembly
8F***85Strainer As; Foot Valve And Strainer Assembly1
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4m1812 Solenoid Switch Assembly
5l8735 Solenoid Switch Assembly--12 Volt
6l5118 Tachometer Drive Group
4l8393 Tachometer Drive Group
Tachometers
1l5010 Air Receiver Group--10.5 Cubic Foot Capacity
1l5011 Regulating And Pressure Reducing Valve Group
6l3093 Vertical Exhaust Fitting Group--5 Inch
5l8602 Vertical Exhaust Fitting Group--4 Inch
6l5857 Bilge Water Pump Group--Large Capacity
3l9921 Whistle Valve
Diesel Engine
Accessory Drive
Air Cleaner (5l7873 N/S)--Dry Type
6l7119 Basic Governor Group--End View--Part 1 Of 2
6l7119 Basic Governor Group--Side View--Part 2 Of 2
Camshaft
Connecting Rod And Piston (9l2368 N/S)--4 Required
Connecting Rod And Piston--4 Required
Crankshaft
Crankshaft Bearing Replacement Groups
2s9004 Cylinder Head Assembly
Cylinder Block And Covers--End View--Part 2 Of 2
Cylinder Block And Covers--Side View--Part 1 Of 2
5s4120 Cylinder Block Assembly
6l6216 Cylinder Block Assembly
Cylinder Head And Valve Mechanism--End View--Part 2 Of 2
Cylinder Head And Valve Mechanism--Side View--Part 1 Of 2
Engine Balancer (6l3465 N/S)
Flywheel
Fuel Filter
2s8767 Fuel Injection Pump Group
Fuel Injection Valves And Lines
Fuel Pump Housing And Governor (7l3354 N/S)
6l1798 Fuel Pump Housing And Governor Group
6L***98Fuel Pump Housing And Governor Group1
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5s5088 Fuel Pump Housing Group
5s4164 Fuel Pump Housing Group
9m6041 Fuel Injection Pump Group
Fuel Ratio Control
6l3347 Fuel Transfer Pump Assembly
7l5732 Fuel Transfer Pump Group
Gasket Kits
6l1557 Basic Governor Group--End View--Part 1 Of 2
7l5444 Governor Group--Side View--Part 2 Of 2
6l1557 Basic Governor Group--Side View--Part 2 Of 2
7l5444 Governor Group--End View--Part 1 Of 2
7l5471 Heat Exchanger Assembly
6l3445 Heat Exchanger Assembly
Marine Gear Oil Cooler (6l5175 N/S)
Oil Cooler
Oil Filter
Oil Pump
6l3473 Oil Pump Assembly
Raw Water Aftercooler
Raw Water Pump, Heat Exchanger And Connections--Part 2 Of 2
Raw Water Pump, Heat Exchanger And Connections--Part 1 Of 2
Service Meter (3l5665 N/S)
Surge Tank And Water Lines
Turbocharger And Mounting
4s9705 Turbocharger Assembly
3s4005 Turbocharger Assembly--Type 2
3s4005 Turbocharger Assembly--Type 1
Water Cooled Exhaust Manifold
6l2750 Water Cooled Exhaust Manifold Group
6L***50Water Cooled Exhaust Manifold Group1
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5l7804 Exhaust Pipe Group
5L***04Water Cooled Exhaust Pipe Group1
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5l6042 Water Pump Assembly
6l7409 Water Pump Assembly
Water Shielded Manifold
Marine Gears
5l1629 Clutch Assembly
4l8440 Clutch Assembly
6l8381 Marine Gear Assembly--Side View--Part 1 Of 3--Type 3
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--End View--Part 3 Of 3--Type 2
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--Side View--Part 2 Of 3--Type 1
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--End View--Part 3 Of 3--Type 3
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--Side View--Part 2 Of 3--Type 3
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--Side View--Part 2 Of 3--Type 2
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--Side View--Part 1 Of 3--Type 1
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--Side View--Part 1 Of 3--Type 2
6L***81Gear As-Marine; Marine Gear Assembly1
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6l8381 Marine Gear Assembly--End View--Part 3 Of 3--Type 1
6L***81Gear As-Marine; Marine Gear Assembly1
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8f9866 Grease Gun--Type 2
8f9866 Grease Gun--Type 1
5l8419 Housing Assembly--3 : 1 Ratio
5l8418 Housing Assembly--2 : 1 Ratio--Type 2
5l8417 Housing Assembly--1.5 : 1 Ratio
5l8418 Housing Assembly--2 : 1 Ratio--Type 1
Marine Controls
5L***91Twin "S" Control --Pilot House; Twin "S" Control-- Pilot House1
5L***16Cable-16 Foot0
5L***17Cable-14 Foot0
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6l8374 Marine Gear Arrangement--2.91 : 1 Ratio
6L***74Marine Gear Arrangement1
6L***79Marine Gear Assembly1
6L***82Mounting Group1
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6l8375 Marine Gear Arrangement--3.8 : 1 Ratio
6L***75Marine Gear Arrangement1
6L***80Marine Gear Assembly1
6L***83Mounting Group-Gear; Mounting Group1
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6l8376 Marine Gear Arrangement--4.48 : 1 Ratio
6L***76Marine Gear Arrangement1
6L***81Gear As-Marine; Marine Gear Assembly1
6L***83Mounting Group-Gear; Mounting Group1
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6l8373 Marine Gear Arrangement--1.93 : 1 Ratio
6L***73Marine Gear Arrangement1
6L***78Marine Gear Assembly1
6L***82Mounting Group1
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6l8372 Marine Gear Arrangement--1.47 : 1 Ratio
6L***72Marine Gear Arrangement1
6L***77Marine Gear Assembly1
6L***82Mounting Group1
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6l8377 Marine Gear Assembly--Side View--Part 1 Of 3--Type 1
6l8379 Marine Gear Assembly--End View--Part 3 Of 3--Type 1
6l8378 Marine Gear Assembly--Side View--Part 2 Of 3--Type 3
6l8379 Marine Gear Assembly--Side View--Part 2 Of 3--Type 1
6l8378 Marine Gear Assembly--Side View--Part 2 Of 3--Type 4
6l8377 Marine Gear Assembly--End View--Part 3 Of 3--Type 3
6l8378 Marine Gear Assembly--Side View--Part 1 Of 3--Type 1
6l8379 Marine Gear Assembly--End View--Part 3 Of 3--Type 3
6l8378 Marine Gear Assembly--Side View--Part 1 Of 3--Type 3
6l8378 Marine Gear Assembly--End View--Part 3 Of 3--Type 2
6l8380 Marine Gear Assembly--Side View--Part 1 Of 3--Type 3
6l8379 Marine Gear Assembly--End View--Part 3 Of 3--Type 2
6l8379 Marine Gear Assembly--Side View--Part 1 Of 3--Type 3
6l8378 Marine Gear Assembly--End View--Part 3 Of 3--Type 1
6l8377 Marine Gear Assembly--Side View--Part 1 Of 3--Type 4
6l8377 Marine Gear Assembly--Side View--Part 2 Of 3--Type 4
6l8378 Marine Gear Assembly--End View--Part 3 Of 3--Type 3
6l8380 Marine Gear Assembly--End View--Part 3 Of 3--Type 3
6l8379 Marine Gear Assembly--End View--Part 3 Of 3--Type 4
6l8380 Marine Gear Assembly--Side View--Part 2 Of 3--Type 3
6l8379 Marine Gear Assembly--Side View--Part 2 Of 3--Type 2
6l8378 Marine Gear Assembly--Side View--Part 2 Of 3--Type 2
6l8379 Marine Gear Assembly--Side View--Part 1 Of 3--Type 4
6l8377 Marine Gear Assembly--End View--Part 3 Of 3--Type 1
6l8379 Marine Gear Assembly--Side View--Part 2 Of 3--Type 4
6l8378 Marine Gear Assembly--Side View--Part 1 Of 3--Type 4
6l8377 Marine Gear Assembly--End View--Part 3 Of 3--Type 4
6l8380 Marine Gear Assembly--Side View--Part 1 Of 3--Type 1
6l8379 Marine Gear Assembly--Side View--Part 1 Of 3--Type 1
6l8377 Marine Gear Assembly--Side View--Part 1 Of 3--Type 3
6l8377 Marine Gear Assembly--Side View--Part 2 Of 3--Type 1
6l8380 Marine Gear Assembly--End View--Part 3 Of 3--Type 2
6l8380 Marine Gear Assembly--Side View--Part 2 Of 3--Type 1
6l8377 Marine Gear Assembly--Side View--Part 2 Of 3--Type 3
6l8379 Marine Gear Assembly--Side View--Part 2 Of 3--Type 3
6l8380 Marine Gear Assembly--Side View--Part 1 Of 3--Type 2
6l8378 Marine Gear Assembly--End View--Part 3 Of 3--Type 4
6l8380 Marine Gear Assembly--Side View--Part 2 Of 3--Type 2
6l8380 Marine Gear Assembly--End View--Part 3 Of 3--Type 1
6l8377 Marine Gear Assembly--End View--Part 3 Of 3--Type 2
6l8377 Marine Gear Assembly--Side View--Part 2 Of 3--Type 2
6l8378 Marine Gear Assembly--Side View--Part 2 Of 3--Type 1
6l8379 Marine Gear Assembly--Side View--Part 1 Of 3--Type 2
6l8377 Marine Gear Assembly--Side View--Part 1 Of 3--Type 2
6l8378 Marine Gear Assembly--Side View--Part 1 Of 3--Type 2
5l8425 Marine Gear Group--3 : 1 Ratio--10,700 Series
5l8423 Marine Gear Group--1.5 : 1 Ratio--10,200 Series
5l8424 Marine Gear Group--2 : 1 Ratio--10,200 Series
5l9187 Marine Gear Group--2 : 1 Ratio--10,200 Series
5l9186 Marine Gear Group--1.5 : 1 Ratio--10,200 Series
5l9191 Marine Gear Group--4 : 1 Ratio--10,700 Series
5l3810 Housing Assembly--4 : 1 Ratio
5l4661 Housing Assembly--1.5 : 1 Ratio
5l4561 Housing Assembly--2 : 1 Ratio
6l7024 Marine Gear Oil Lines Group
4l8207 Mounting And Support Group--3 : 1 And 4 : 1 Ratio
4l8208 Mounting And Support Group--1.5 : 1 And 2 : 1 Ratio
6l8382 Mounting Group
6l8383 Mounting Group
6L***83Mounting Group-Gear; Mounting Group1
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Name Plates And Transfers
1H***40Transfer; Safety On Dash Or Guards When Used1
1S***80Film-Crankcase Oil Filler; On Crankcase Oil Filler Cap1
1S***47Transfer; Crankcase Instructions On Oil Filter Or Open Space Near Oil Filter1
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4l7306 Pump Assembly
6l9797 Selector Valve Assembly
4l1560 Tool Group
7l2927 Selector Valve Assembly
7L***27Valve As-Selector; -Transmission1
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4l7018 Valve Assembly
6l6729 Valve Assembly

D330B serial number reference

The PIN plate is located on the machine. The prefix consists of the first three alphanumeric characters of the serial number.

PrefixIdentifies
56BIndustrial, Gen set, or Marine
57BIndustrial, Gen set, or Marine
81BIndustrial, Gen set, or Marine
82BIndustrial, Gen set, or Marine
85BIndustrial, Gen set, or Marine
86BIndustrial, Gen set, or Marine

Frequently asked questions

What are the core engine specifications for the D330B?

The D330B is a 4-cylinder, 4-stroke diesel engine featuring a 4-1/2 inch bore. It was designed for reliable, mid-range output in industrial and marine applications.

What is the typical operating environment for this engine?

The D330B is engineered for ruggedness in high-moisture, salt-heavy air, or dusty environments, making it suitable for dockyards, inland waterways, and agricultural sectors.

What replaced the D330 series?

The D330 series was succeeded by the D330C engine, which introduced a larger 4-3/4 inch bore and a separate gear-driven water pump.

What D330B owners discuss

What are the primary differences between D330 engine series generations?
The D330 series evolved through several configurations. The early 78A series utilized a D330A with a 4.5-inch (114.3 mm) bore, featuring an integrated water pump and fan drive. Later, the D330C introduced a larger 4.75-inch (120.65 mm) bore and a separate gear-driven water pump. The D330B designation is often associated with industrial applications or viewed as an intermediate model between the A and C series.
How does engine configuration affect cold-start performance in the 330B?
Because the 3306TA engine is mechanically governed without an ECM, it lacks automated cold-start compensation. Operators should utilize engine-block heaters, correct viscosity oil, and glow plugs or ether-start aids to assist during low temperatures.
What are common electrical causes for dashboard warning lights or gauge failures?
Electrical instability is a frequent issue in Caterpillar excavators. Specifically, the coolant temperature sensor and oil pressure switch feeding the gauge cluster are common failure points when warning lamps activate despite no mechanical issues. Additionally, communication faults on the monitor may stem from damaged wiring or connectors rather than machine controller failures.
What hydraulic maintenance is required if metal particles appear in the oil?
If S.O.S oil sampling indicates metal loading in the hydraulic oil, the main hydraulic pump and cylinders should be inspected for wear and resealed or rebuilt as necessary.
What undercarriage inspections are critical during routine service?
Every 10 hours, inspect track tension, shoes, rollers, and idlers for cracking or wear. Additionally, check the final drive seals for any signs of gear-oil weeping.
What should be checked when purchasing a used D330B excavator?
Verify the exact serial-prefix specification sheet and the installed attachment package. Check for variations in undercarriage length (Standard, L, or LN) and boom/stick configurations, as these significantly alter operating weight, reach, and ground pressure.
What is a known issue regarding cylinder liner installation in D330 engines?
Excessive counterbore depth (e.g., 447 microns vs the 400 micron specification) can occur. This may require machining the deck or using liner shims to bring the height back to specification; however, avoid stacking too many thin shims to prevent potential exhaust gas erosion.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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