Caterpillar 330B LN
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 330B LN is a 33-34 tonne class hydraulic excavator in Cat's 330 medium-excavator line, built with a long-track, narrow-gauge undercarriage for confined-clearance work. It runs the Cat 3306TA turbocharged and aftercooled inline-six diesel, a mechanically governed engine with no ECM, rated around 165.6 kW (222 hp). Operating weight lands near 33,730 kg (74,362 lb) as factory-configured, though actual weight varies with bucket, counterweight, and undercarriage options. Cat built the 330B LN roughly from 1997 to 2001, alongside its standard-gauge 330B and long-track 330B L siblings; all three shared the same engine and hydraulics and differed mainly in undercarriage width and track length.
The 330B family sits between the original 330/330 L excavators and the 330C generation that followed. Where the 330B kept the same mechanical 3306TA powertrain through its run, the 330C line moved to Cat's electronically controlled 3126B ATAAC engine, adding onboard diagnostics the earlier machine never had. That split is part of why the 330B LN still holds value in the used and parts market: its mechanical fuel system and simple wiring are easier to diagnose and rebuild in the field without dealer software. The narrow-gauge undercarriage also keeps steady demand among contractors needing a full-size 330-class excavator that can still travel through gates, trenches, or pipeline rights-of-way too tight for the standard-gauge machine.
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 330B LN specifications
Engine
| Engine model | Cat 3306TA — inline 6-cylinder, 4-stroke-cycle diesel, turbocharged and aftercooled |
| Power rating | 165.6 kW (222 hp) at 1800 rpm gross; some documentation for this rating lists 176 kW (236 hp) gross / 165.6 kW (222 hp) net for the same 3306TA — figure varies by configuration/series. |
| Displacement | 10.5 L (640.8 cu in), 6 cylinders inline |
| Emissions tier | Not documented for this production era (1997-2001); this is a mechanically governed, pre-emissions-regulation diesel typical of its build years. Verify against the specific engine arrangement number if certification matters. |
Weights
| Operating weight (standard configuration) | 33,730 kg (74,362 lb) |
Dimensions
| Transport length | 11.15 m (36.59 ft) with the standard boom/stick; about 10.81 m (35.47 ft) with the shorter-reach boom option |
| Transport width (over tracks) | 2.99 m (9.81 ft) |
| Transport height | 3.56 m (11.68 ft); up to about 3.58 m (11.75 ft) with the mass-excavation boom |
| Height to top of cab | 3.25 m (10.67 ft) |
| Tail swing radius | 3.50 m (11.49 ft) |
| Track gauge | 2.39 m (7.85 ft) |
| Track shoe width | 600 mm (23.6 in) |
| Ground clearance | 0.51 m (1.68 ft) |
Performance
| Max dig depth | 8.06-8.08 m (26.45-26.51 ft) with the standard boom/stick; about 6.10 m (20.02 ft) with the shorter-reach boom option |
| Max reach at ground level | 11.62-11.64 m (38.13-38.20 ft) standard; about 9.64 m (31.63 ft) with the shorter-reach boom option |
| Max cutting height | 10.73-10.77 m (35.21-35.34 ft) standard; about 9.64 m (31.63 ft) with the shorter-reach boom option |
| Max loading/dump height | 7.60-7.65 m (24.94-25.10 ft) |
| Max travel speed | 4.6-4.7 km/h (2.86-2.90 mph) |
| Drawbar pull | 268 kN (60,250 lbf) |
| Swing speed / gradeability | Not documented for this machine; confirm with dealer literature. |
Forces
| Bucket and stick digging force | Not documented for this machine generation. Confirm the exact digging-force rating for a specific boom-stick-bucket combination against dealer literature. |
Service capacities (summary)
| Fuel tank | 560 L (148 gal) |
| Hydraulic system | Main pump flow 480 L/min (126.9 gpm) at 343 bar (4,980 psi) relief pressure. Reservoir capacity not separately published for this configuration. |
| Engine oil | Not documented specifically for this configuration. |
| Cooling system | Not documented specifically for this configuration. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
330B LN fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) - Cat 3306TA | 30 L (7.9 US gal); some references round to 30.3 L (8 US gal) | Cat DEO (Diesel Engine Oil). SAE 15W-40 for ambient above -18°C (0°F); SAE 10W-30 across roughly -18°C to 40°C (0°F to 104°F); full-synthetic 0W-20 or 5W-40 for sustained cold below -20°C (-4°F). |
| Cooling system | 45.0 L (11.9 US gal) | Cat DEAC (Diesel Engine Antifreeze/Coolant) or Cat ELC (Extended Life Coolant), both meeting Cat EC-1 spec. Mix to 50/50 or per climate; DEAC needs periodic supplemental coolant additive, ELC does not. |
| Fuel tank | 549-560 L (145-148 US gal), varies by configuration/series | No. 2-D diesel fuel per Cat fuel spec; No. 1-D or a winter-blend diesel is recommended below -7°C (20°F) for cold-start and anti-gel protection. |
| Hydraulic system total (including tank) | 400-401 L (105.7-106 US gal) system total; a tank-only refill figure is not separately published for this configuration - the OMM references the system total | Cat TDTO (Transmission/Drive Train Oil), used as the factory-fill hydraulic oil on this machine class to standardize with final drive/swing drive oil. SAE 10W for general and cold-climate service; SAE 30 where sustained high ambient heat calls for a heavier grade. |
| Final drive (each side, two total) | 15.1 L (4 US gal) per side | Cat TDTO meeting Cat TO-4 spec. SAE 10W in cold climates; SAE 30 in hot climates, matching the hydraulic system grade selection. |
| Swing drive | 15.1 L (4 US gal) | Cat TDTO meeting Cat TO-4 spec, same grade selection by ambient temperature as the final drives. |
| Pilot / other hydraulic circuits | Not separately published - drawn from and included in the hydraulic system total above | Same Cat TDTO hydraulic fluid as the main hydraulic system; the pilot circuit shares the main hydraulic tank. |
| Grease (swing gear, pins, bushings) - spec only | N/A - applied at service intervals, not a refill capacity | Cat Multipurpose Grease (Cat MPGM), NLGI Grade 2, for general pin and bushing points; Cat Extreme Application (XA) grease for the swing gear and other high-load, high-temperature points where specified. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 330B LN maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 6,000 h |
|
Servicing the 330B LN beyond the schedule
Predictive Maintenance & Fluid Analysis
The 3306TA has no ECM and throws no fault codes, so scheduled S·O·S sampling of engine oil, hydraulic oil, and swing/final drive gear oil is the main early-warning system on a 330B LN. Watch engine oil for soot loading and fuel dilution typical of aging mechanical injection pumps, and check hydraulic oil for water and metal fines that signal pump or cylinder wear. Track coolant condition closely; a mechanically governed engine can run hot without an automatic derate to flag it.
Corrective & Common Repairs
Common issues on a high-hour 330B LN center on the mechanical fuel system: injection pump wear, sticking injectors, and turbocharger boost leaks that cost power on the 3306TA. The narrow-gauge undercarriage carries the same weight on a tighter track footprint, so shoes, rollers, and idlers wear faster than on the standard-gauge 330B and need closer inspection. Swing bearing play and worn bucket/stick pins are frequent complaints on machines worked hard in confined trenching or pipeline duty.
Overhaul & Rebuild Points
At high hours, plan a 3306TA top-end rebuild covering injectors, turbocharger, and valve train; the mechanical fuel system tolerates rebuild and re-timing well compared to later electronic engines. Final drive and swing drive gear sets are common rebuild candidates once oil samples show metal content. On the LN undercarriage, full chain, roller, idler, and sprocket replacement comes sooner than on wider-gauge 330B siblings because the narrower gauge concentrates ground loading on fewer, more heavily worked components.
Seasonal & Environment Servicing
Cold-start the 3306TA with ether or a manual glow/air-intake heater rather than relying on automatic logic the mechanical engine doesn't have, and confirm coolant antifreeze concentration before winter. Use a winter-blend diesel to prevent fuel gelling in the mechanical injection system. In wet or muddy conditions, clean the narrow-gauge undercarriage more often than a standard-gauge 330B; the tighter track-to-frame clearance packs mud and debris faster. In hot, dusty sites, service the air filter more frequently to protect the turbocharger.
330B LN fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| A201 | Communication problem between the Engine and Pump Control (EPC) module and the cab monitor panel — monitor is not receiving a valid signal from the controller. | Broken, corroded, or loose data-link wiring or connector between the monitor panel and the EPC controller; blown fuse or weak ground on either unit. | Confirm disconnect switch and keyswitch power reach both units, inspect the harness and connectors between monitor and controller for corrosion or breaks, check the controller status LED, then check fuses before condemning either module. |
| A202 | Monitor takes too long to respond to the EPC controller's signal — a communication timing fault on the same data link. | Intermittent data-link connection, marginal or oxidized connector pins, or an unstable power/ground supply to the controller causing delayed handshake. | Clean and reseat data-link connectors, inspect harness for chafing near moving components, and verify steady controller power and ground before replacing parts. |
| A203 | Communication is abnormal within the EPC controller itself, not just on the link to the monitor. | Internal controller fault or an unstable power/ground supply feeding the controller. | Verify controller power and ground circuits first; if those check good, test or replace the EPC controller. |
| 3201 | Monitor panel is abnormal — an internal self-check failure in the display/gauge unit itself. | Faulty monitor panel, damaged internal display, or corrupted/unstable power supply to the monitor. | Cycle key power, check the monitor's fuse and power wiring, and replace the monitor panel if the fault persists after wiring checks. |
| Engine Oil Pressure warning lamp (no digit/letter code on this analog panel) | Oil pressure has dropped below the safe threshold sensed by the engine oil pressure switch/sender. | Low engine oil level, worn oil pump, clogged oil filter, or a faulty pressure sender/switch. | Shut the engine down immediately, check oil level and condition, then inspect the pressure sender and oil pump before restarting. |
| Coolant Temperature warning lamp (no digit/letter code on this analog panel) | Engine coolant temperature has exceeded the normal operating range. | Low coolant level, blocked or dirty radiator core, failing thermostat, worn water pump, or a slipping fan drive. | Idle down and shut off to cool, check coolant level and radiator fins for debris, then inspect thermostat and fan drive if overheating repeats. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
330B LN attachments & work tools
Buckets
General-purpose buckets for this class run around 1.37 m (54 in) wide with roughly 1.6 m3 rated capacity; the factory-listed standard bucket capacity is about 1.8 m3. Heavy-duty buckets step up to 1.5-1.68 m (60-66 in) wide with 1.86-2.08 m3 capacity, and reinforced rock buckets are offered in similar widths for abrasive/hard-dig work. Buckets mount pin-on to the D-linkage stick or via a hydraulic/mechanical quick coupler; exact capacity and width depend on stick length and linkage configuration, so treat these as typical ranges, not a single spec.
Hydraulic hammers
This machine falls in the roughly 28-35 metric ton carrier class used for medium-to-heavy breaker work, with matching hammer classes commonly rated in the 2500-3500 kg operating-weight range (some sources list a wider 1500-3500 kg band depending on duty cycle and brand). Breakers for this size class typically use 80-100 mm mounting pins matched to the machine's D-linkage bucket ears. Confirm exact breaker weight against the machine's stick/boom configuration and factory auxiliary flow rating before ordering.
Quick couplers
The 330B offered both hydraulic pin-grabber and mechanical quick-hitch couplers as factory or dealer-fit options, letting attachments be swapped without pulling pins by hand. Pin diameters for this class run 80-90 mm on the standard D-linkage and up to 90-100 mm on heavier E/DB-linkage sticks, so coupler pin sizing varies by configuration and should be matched to the specific stick fitted.
Thumbs/grapples
Hydraulic thumbs mount alongside the bucket linkage to add clamping/gripping ability for sorting, loading, and placing irregular material such as rock, stumps, and debris. Demolition and sorting grapples are also used on this class for handling concrete, rebar, wood, and mixed debris, running off the machine's auxiliary hydraulic circuit rather than the main bucket circuit.
Rippers
A single-shank, stick-mounted ripper is the typical attachment for breaking up rock, frozen ground, or pavement on this class, sized for the 25-35 metric ton excavator range. Ripper stick and linkage pin diameters follow the same 90-100 mm range as the machine's buckets, since the ripper pins into the same D/DB-linkage geometry.
Hydraulic-kit notes
The 330B carries a standard auxiliary hydraulic valve for one-way circuit tools (hammers, compactors) and offered a factory auxiliary flow control option with programmable flow presets to match different tool requirements, useful when switching between hammers, shears, processors, and brush cutters. Tools that rotate or need a two-way circuit (grapples, shears, multi-processors) need this auxiliary/proportional flow option rather than the base one-way circuit; verify which auxiliary circuit is fitted to a given unit before matching a tool.
All 330B LN assemblies by section
Every catalogued assembly group for the Caterpillar 330B LN. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Electrical And Starting System
Cp-1384670 Mounting Gp-Control
| 13***70 | Control & Mtg Group-Auxiliary Flow | 1 |
Cp-1384653 Control Gp-Foot
| 13***53 | Control Group-Foot | 1 |
Cp-1534110 Harness As
| 15***10 | Harness As | 1 |
Cp-1415403 Harness As
| 14***03 | Harness As | 1 |
Cp-1534157 Harness As
| 15***57 | Harness As | 1 |
Cp-1534156 Harness As.
| 15***56 | Harness As. | 1 |
Cp-1534159 Harness As.
| 15***59 | Harness As. | 1 |
Cp-1534109 Harness As.
| 15***09 | Harness As. | 1 |
Cp-1415418 Panel Gp-Relay
| 14***18 | Panel Group-Relay | 1 |
Cp-1534132 Wiring Gp-Auxiliary Control
| 15***32 | Wiring Group-Auxiliary Control | 1 |
1415401 Wiring Gp-Auxiliary Control
| 14***01 | Wiring Group-Auxiliary Control | 1 |
| 14***03 | Harness As | 1 |
| 14***18 | Panel Group-Relay | 1 |
Cp-1284946 Wiring Gp-Auxiliary Control
| 12***46 | Wiring Group-Auxiliary Control | 1 |
Cp-1534111 Wiring Gp-Auxiliary Control
| 15***11 | Wiring Group-Auxiliary Control | 1 |
Hydraulic System
Cp-1415421 Control Ar
| 12***66 | Film Group; Film Gp-Combined Function | 1 |
| 13***59 | Instructions | 1 |
| 13***70 | Control & Mtg Group-Auxiliary Flow | 1 |
Cp-1384652 Control Gp-Joystick
| 13***52 | Control Group-Joystick | 1 |
Cp-1297999 Drive Gp-Pump
| 12***99 | Drive Group-Pump | 1 |
Cp-2q4981 Hose As
| 2Q***81 | Hose As | 1 |
Cp-1446364 Hose As
| 14***64 | Hose As | 1 |
Cp-2q4982 Hose As
| 2Q***82 | Hose As | 1 |
Cp-1384664 Hydraulic Ar
| 13***64 | Hydraulic Ar | 1 |
Cp-1466516 Lines Gp-Hydraulic
| 14***16 | Lines Group | 1 |
Cp-1389140 Lines Gp-Rotator
| 13***40 | Lines Group Rotator | 1 |
Cp-1345377 Lines Gp-Auxiliary Hydraulic
| 13***77 | Lines Group-Auxiliary Hydraulic | 1 |
Cp-1335639 Lines Gp-Auxiliary Hydraulic
| 13***39 | Lines Group-Auxiliary Hydraulic | 1 |
Cp-1389118 Lines Gp-Boom
| 13***18 | Lines Group-Boom | 1 |
Cp-1384657 Lines Gp-Boom
| 13***57 | Lines Group-Boom | 1 |
Cp-1389119 Lines Gp-Drain
| 13***19 | Lines Group-Drain | 1 |
Cp-1389141 Lines Gp-Drain
| 13***41 | Lines Group-Drain | 1 |
Cp-1652722 Lines Gp-Front
| 16***22 | Lines Group-Front; Lines Gp Front | 1 |
Cp-1652721 Lines Gp-Front
| 16***21 | Lines Group-Front; Lines Gp Front | 1 |
Cp-1652723 Lines Gp-Pilot
| 16***23 | Lines Group-Pilot; Lines Gp Pilot-C | 1 |
Cp-1623275 Lines Gp-Pilot
| 16***75 | Lines Group-Pilot; Lines Gp Pilot C | 1 |
Cp-1353332 Lines Gp-Rotator
| 13***32 | Lines Group-Rotator | 1 |
Cp-1389102 Lines Gp-Stick
| 13***02 | Lines Group-Stick | 1 |
Cp-2z9810 Lines Gp-Stick
| 2Z***10 | Lines Group-Stick | 1 |
Cp-1389100 Lines Gp-Stick
| 13***00 | Lines Group-Stick | 1 |
Cp-1399347 Lines Gp-Stick
| 13***47 | Lines Group-Stick | 1 |
Cp-2z9804 Lines Gp-Stick
| 2Z***04 | Lines Group-Stick | 1 |
Cp-1446325 Pump & Mounting Gp
| 13***98 | Pump Group-Gear; -Medium Pressure | 1 |
| 14***25 | Pump & Mounting Group | 1 |
| 8T***23 | Washer-Hard; (13.5x25.5x3-mm Thk)(Bolt To Shield) | 4 |
Cp-6c6746 Valve Gp
| 6C***46 | Valve Group | 1 |
Cp-1443613 Valve Gp-Auxiliary Manifold
| 14***13 | Valve Group-Auxiliary Manifold | 1 |
Implements
Cp-1399344 Installation Ar
| 13***44 | Installation Ar | 1 |
Cp-1399342 Installation Ar
| 13***42 | Installation Ar | 1 |
Cp-1389112 Installation Ar
| 13***12 | Installation Ar | 1 |
Cp-1399346 Installation Ar.
| 13***46 | Installation Ar. | 1 |
Service Equipment And Supplies
Cp-1287866 Film Gp
| 12***66 | Film Group; Film Gp-Combined Function | 1 |
330B LN serial number reference
The PIN plate sits on the right side of the main frame near the base of the operator cab; the PIN is also stamped directly into the frame at the same spot as a backup if the plate is lost. On these pre-2001 machines the PIN reads as a 3-character prefix followed by a sequential production number (for example 3YR00001) - the prefix identifies the model/configuration build series and the digits after it are the sequential unit count within that series.
| Prefix | Identifies | Notes |
|---|---|---|
| 3YR | 330B LN | Serial series 3YR00001 and up, factory-documented as a 330B LN excavator build, powered by the 3306 engine (turbocharged, aftercooled). The same 3YR range also covers the standard 330B L build in a shared PIN series, with LN (long, narrow-gauge undercarriage) as a build option within that series rather than a separate serial run. |
| 5LR | 330B LN | Serial series 5LR00001 and up, factory-documented as covering both 330B L and 330B LN configurations, powered by the 3306 engine. Falls within a combined 330B L/LN factory service manual set alongside the 4RS and 5LS ranges. |
| 4RS | 330B LN - confirm with dealer | Falls within the same combined 330B L/LN service manual set as 5LR and 5LS. Standalone documentation for this range names only 330B, without the L or LN suffix. Engine on record is the 3306. Verify LN-specific applicability with a dealer before use. |
| 5LS | 330B LN - confirm with dealer | Falls within the same combined 330B L/LN service manual set as 4RS and 5LR. Standalone documentation for this range names only 330B, without the L or LN suffix. Engine on record is the 3306. Verify LN-specific applicability with a dealer before use. |
Frequently asked questions
What engine does the Caterpillar 330B LN use?
The 330B LN uses the Cat 3306TA, a turbocharged and aftercooled inline-six diesel rated around 165.6 kW (222 hp). It is mechanically governed with no electronic engine control.
What is the operating weight of the Caterpillar 330B LN?
Operating weight is approximately 33,730 kg (74,362 lb) as factory-configured, varying with bucket, counterweight, and other attachment choices.
What replaced the Caterpillar 330B LN?
The 330C family succeeded the 330B line, including a 330C LN long-narrow variant. The 330C switched to Cat's electronically controlled 3126B ATAAC engine in place of the mechanical 3306TA.
What 330B LN owners discuss
Why does the engine bog down or fail to rev up when hydraulic load is applied on a 330B LN?
A function (stick, swing, etc.) keeps moving after the joystick is released and centered — what causes that?
Why does hydraulic oil run hot on the 330B / 330B LN after an hour or two of steady work?
What wear patterns are typical in the undercarriage and final drives on this machine?
What engine quirks show up on the 3306TA used in the 330B LN?
What electrical or sensor problems come up on 330B-series machines?
What should I check before buying a used 330B LN?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 330B LN part?
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