Caterpillarexcavator

Caterpillar 330B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 330B is a mid-to-large hydraulic crawler excavator in the roughly 32-35 tonne operating weight class, powered by Cat's 3306TA turbocharged and aftercooled inline-six diesel: 176 kW (236 hp) gross, 166 kW (222 hp) net at 1,800 rpm, 10.5 L (640 cu in) displacement, mechanically governed with no engine ECM. Caterpillar introduced the 330B in 1996 as the replacement for the earlier Cat 330/330L and built it through 2002, before the 330C generation took over. Caterpillar offered it as the standard-undercarriage 330B, the long-undercarriage 330B L for added stability and reach, and the long-narrow-undercarriage 330B LN for tighter working envelopes; boom, stick, and counterweight choices further widened the weight and reach spread across all three.

Across the B-series, Caterpillar kept the same 3306TA engine and hydraulic architecture and varied undercarriage length and track gauge to change stability, digging geometry, and site access rather than the powertrain. The 330B, 330B L, and 330B LN differ mainly in operating weight, track-shoe width, and reach/depth figures tied to their boom and stick options, not in engine output. As the last fully mechanical, non-ECM generation of the 330 before the 330C introduced electronic engine control, the 330B still appeals to owners who want simpler diagnostics and fewer electronic failure points. Decades on, it remains common in the used and parts market as an affordable, mechanically straightforward heavy excavator, backed by a wide aftermarket parts and rebuild-kit supply built around the widely produced 3306 engine family.

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 specifications

Engine

Engine model	Cat 3306 TA, inline 6-cylinder diesel, turbocharged and aftercooled. Same engine platform is shared with the 330B L configuration.
Gross power	176 kW (236 hp) at 1800 rpm
Net power (flywheel)	166 kW (222 hp) at 1800 rpm
Displacement	10.5 L (640.8 cu in)
Cylinders	6, inline
Emissions tier	Mechanically governed, direct-injection design that predates off-road EPA/EU Tier and Stage exhaust-emissions regulation; no emissions tier certification applies to this engine.

Weights

Operating weight, standard 330B	32,420 kg (71,474 lb), boom/stick and counterweight per base configuration
Operating weight, 330B L (long-undercarriage config)	Reported 33,700-34,660 kg (74,300-76,412 lb) depending on source and counterweight/shoe combination; heavier than the base 330B due to the longer undercarriage and larger standard shoe
Ground pressure	Not published in the spec sources surveyed for this generation; varies with track shoe width and counterweight option - confirm with dealer or factory spec sheet for a specific serial/shoe combination
Transport weight	No separate transport/shipping weight is published; sources report only the operating weight figures above

Dimensions

Transport length	11.08 m (36 ft 4 in), with boom 6.5 m / stick 3.9 m installed
Transport width (over tracks), standard 330B	3.19-3.20 m (10 ft 6 in)
Transport width (over tracks), 330B L	3.34-3.35 m (11 ft 0 in), wider standard shoe fitted
Transport height	Height to top of cab is 3.15-3.17 m (10 ft 4 in); shipping height with boom lowered is reported up to about 3.61 m (11 ft 10 in) depending on source and boom option
Tail swing radius	3.50-3.51 m (11 ft 6 in)
Track shoe width, standard 330B	600 mm (23.6 in)
Track shoe width, 330B L	750 mm (29.5-29.6 in)
Ground clearance	0.51-0.52 m (1 ft 8 in)
Undercarriage/track length on ground, standard 330B	3.61 m (11 ft 10 in)
Undercarriage/track length on ground, 330B L	4.04 m (13 ft 3 in), longer undercarriage than the base 330B

Performance

Max dig depth	8.08-8.11 m (26 ft 6 in - 26 ft 7 in), with the longer of the two factory stick options (boom 6.5 m / stick 3.9 m)
Max reach at ground level	11.62-11.64 m (38 ft 2 in - 38 ft 3 in)
Max dump/loading height	7.60-7.62 m (24 ft 11 in - 25 ft 0 in)
Max cutting height	10.77-10.79 m (35 ft 4 in - 35 ft 5 in)
Swing speed	Not published in the spec sources surveyed for this generation
Max travel speed	4.6-4.7 km/h (2.86-2.90 mph)
Gradeability	Not published in the spec sources surveyed for this generation
Max drawbar pull	27,329 kgf (60,250 lb)
Swing torque	Approximately 106,000 N·m (78,200 lb-ft)
Stick option note	Factory offered a second, shorter stick option (boom 6.5 m / stick 3.3 m) that trades reach and depth for higher breakout force; exact figures for that configuration were not found in the sources surveyed

Forces

Bucket digging force	Not published in the spec sources surveyed for this generation - confirm with a factory spec sheet or dealer for the exact bucket linkage fitted
Stick/arm digging force	Not published in the spec sources surveyed for this generation; would be expected to differ between the standard 3.9 m stick and the shorter 3.3 m stick option, but no figures were found for either

Service capacities (summary)

Fuel tank	549-560 L (145-148 gal), figures vary slightly by source (refill vs. full capacity)
Hydraulic system	400-401 L (105.7-106 gal)
Engine oil	29.9-30.3 L (7.9-8.0 gal)
Cooling system	45.0 L (11.9 gal)
Swing drive	15 L (4 gal)

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

330B fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter) - 3306TA diesel	30.3 L (8.0 US gal) full system; approx. 29.9 L (7.9 US gal) refill at an oil-and-filter change	Cat 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) for easier cold start, straight SAE 30 in sustained heat above 30 C (86 F). Select grade from the Cat viscosity-by-ambient-temperature chart at start-up.
Cooling system	45.0 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 a higher antifreeze concentration in climates colder than about -20 C (-4 F) per the coolant/antifreeze mixing table.
Fuel tank	560 L (148 US gal) full; approx. 549 L (145 US gal) service refill	No. 2-D diesel fuel (ASTM D975) for normal operation. Switch to No. 1-D or a winter-blend No. 2-D in cold weather to prevent fuel waxing/gelling. Use low-sulfur diesel where local rules require it.
Hydraulic system total (incl. tank)	400-401 L (105.7-106 US gal), service refill including tank	Caterpillar Hydraulic Oil (Cat HYDO). Accepted alternatives: Cat DEO, Cat TDTO, or Cat MTO. Grade selected by ambient temperature per the Cat hydraulic-oil viscosity chart - lighter multigrade for cold-start regions, heavier single grade for sustained heat.
Hydraulic tank (reservoir) only	Not published separately in available spec sheets - the system total above (approx. 400 L / 105.7 US gal) is a combined tank-plus-circuit figure; confirm a tank-only fill volume against the OMM refill chart or with your dealer	Same fluid as hydraulic system total - Cat HYDO (or accepted alternatives above).
Final drive (each)	15.1 L (4.0 US gal) per side	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 per the TO-4 viscosity-by-temperature chart.
Swing drive	15.1 L (4.0 US gal)	Cat TDTO, TO-4 spec - same viscosity-by-climate guidance as the final drives.
Pilot / other circuits	No separate reservoir - pilot circuit draws from the main hydraulic tank, included in the hydraulic system total above	Same fluid as hydraulic system - Cat HYDO.
Grease (all pins and bushings)	Spec only - no reservoir capacity	Cat MPGM (Multipurpose Grease), NLGI 2, for general pin and bushing lubrication points. Cat XA (Extreme Application) grease as 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 330B maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level, coolant level, and the hydraulic oil sight gauge before starting. Walk around the machine and check for oil or coolant residue under the engine, hydraulic tank, swing drive, and final drives. Inspect track tension, shoes, rollers, and idlers for wear, cracking, or gear-oil weep at the final drive seals. Drain water and sediment from the fuel/water separator. Grease boom, stick, and bucket linkage pins and the swing bearing gear teeth (weekly). Check battery terminals, electrolyte level, and charge (weekly).
Every 250 h	Change engine oil and filter on the 3306TA. Pull S.O.S oil samples from the engine, hydraulic tank, swing drive, and both final drives. Check swing drive and final drive oil levels. Inspect and adjust track sag on both standard and long-undercarriage machines. Service the primary fuel filter/water separator element. Check alternator belt tension and condition.
Every 500 h	Replace primary and secondary fuel filters on the mechanically governed fuel system. Replace hydraulic return and case-drain filter elements. Top off or change swing drive and final drive gear oil based on S.O.S trends. Service the air filter primary element or replace per the restriction indicator. Inspect the turbocharger for shaft play, oil leaks, and boost-side leaks. Check the track adjuster recoil spring/cylinder for grease and leaks.
Every 1,000 h	Change swing drive and final drive gear oil. Replace the air filter secondary element. Adjust valve lash on the 3306TA to the factory clearance spec. Inspect the injection pump and governor linkage and check the fuel setting. Check swing bearing bolt torque and gear backlash. Inspect boom, stick, and bucket pin and bushing wear.
Every 2,000 h	Change engine coolant and pressure-test the cooling system (skip only if extended-life coolant is in service and still within life). Change hydraulic tank oil and clean the tank strainer and breather. Fully change final drive and swing drive gear oil. Inspect the main hydraulic pump and control valve for wear if S.O.S trends indicate it. Re-torque track shoe bolts and undercarriage fasteners. Check starter, alternator, and wiring harness condition.
Every 4,000 h	Inspect and case-drain-flow test the swing motor for internal leakage. Inspect final drive floating (duo-cone) seals and rebuild planetaries showing gear-oil contamination. Reseal or rebuild the main hydraulic pump and cylinders with worn seals. Recheck valve lash and injection timing alongside an engine top-end inspection.
Every 6,000 h	Budget for undercarriage replacement (rollers, idlers, sprockets, chain) based on measured wear, sooner on rock or demolition sites. Evaluate the 3306TA for an inframe overhaul (liners, rings, main and rod bearings) if oil consumption and blow-by trend upward. Inspect and rebuild the swing bearing and gear set if backlash or noise is present. Perform a full hydraulic system flush and reseal cylinders as needed.

Servicing the 330B beyond the schedule

Predictive Maintenance & Fluid Analysis

The mechanically governed 3306TA has no engine ECM, so fluid analysis is the main early-warning tool on a 330B. Pull S.O.S samples from the engine, hydraulic tank, swing drive, and both final drives on the same schedule as oil changes, and watch for gear-oil dilution signaling a worn final-drive floating seal. Track turbocharger bearing wear through oil analysis and boost readings, and run a case-drain flow test on the swing motor periodically to catch internal leakage before it causes swing lag or drift.

Corrective & Common Repairs

Final drive floating (duo-cone) seals are a known 330B wear point: repeated gear-oil top-offs signal a failing seal letting oil escape into the planetary hub. Swing motors develop case-drain leakage and worn pistons, showing up as swing lag or drift. Hydraulic pump wear slows cycle times, and clogged oil coolers or failed thermostatic valves cause hydraulic overheating on hot sites. Because the 3306TA is mechanically governed, valve lash drifts silently with no warning light, so it needs to be checked and reset on schedule rather than reactively.

Overhaul & Rebuild Points

Plan swing bearing and gear backlash inspection, plus final-drive planetary rebuilds, around the 4,000-6,000 hour mark on a working 330B. Budget for a 3306TA inframe overhaul (liners, rings, main and rod bearings) once oil consumption and blow-by trend upward. Undercarriage components (rollers, idlers, sprockets, chain) wear out on a similar horizon, faster on rock or demolition sites, and long-undercarriage 330B L/LN machines carry more chain to wear. Reseal or rebuild the main hydraulic pump and cylinders once S.O.S shows metal loading in the hydraulic oil.

Seasonal & Environment Servicing

Cold starts on the mechanically governed 3306TA rely on the engine-block heater, correct-viscosity oil, and glow or ether-start aids since there's no ECM cold-start strategy to compensate. Check coolant glycol concentration before winter to protect the 10.5 L block. In hot, dusty environments, service the air filter and hydraulic/engine oil coolers more often to prevent overheating and turbo intake restriction. On soft or wet ground, long-undercarriage 330B L and LN configurations need more frequent track-tension checks to avoid derailing or excess chain wear.

330B fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Coolant Temperature gauge - red zone, Warning Category 3 shutdown	Engine coolant temperature has reached the high-temperature threshold on the monitor gauge; the action lamp flashes and the alarm sounds ahead of an automatic protective shutdown.	Low coolant level, plugged radiator fins, worn or slipping fan drive, stuck thermostat, or a faulty water temperature sending unit.	Stop the machine safely, let it cool, check coolant level and radiator core for debris, inspect fan drive and belt, verify the sending unit before returning to service.
Hydraulic Oil Temperature gauge - red zone warning	Hydraulic tank oil temperature has exceeded the normal operating range shown on the gauge.	Clogged oil cooler core, low hydraulic oil level, worn pump or relief valve generating excess heat, or a stuck cooler bypass valve.	Idle down and allow temperature to drop, check oil level, clean cooler fins, check bypass valve operation before resuming work.
Engine Oil Pressure - low pressure warning/shutdown	The oil pressure switch has detected pressure below the safe minimum; the monitor lights the low oil pressure indicator and the mechanical safety switch can energize the fuel shutoff solenoid.	Low engine oil level, worn oil pump, plugged suction screen, or a failed oil pressure switch or sender.	Shut the engine down immediately, check oil level and condition, verify actual pressure with a mechanical test gauge before restarting.
Charging System indicator - alternator/battery warning	Indicator shows the alternator is not charging the battery circuit at the expected rate.	Worn or broken alternator belt, failed alternator, loose or corroded battery terminals, or a wiring/ground fault.	Check belt tension and condition, inspect battery terminals and ground connections, load-test the alternator.
Fuel Level indicator - low fuel warning	Fuel sender shows tank level has dropped below the set reserve threshold.	Normal low-fuel condition, or a stuck or failed fuel level sender/float giving a false reading.	Refuel; if the indicator stays on after a full tank, check the sender and float for a stuck or broken unit.
Engine Air Filter restriction indicator	Air intake restriction has reached the service limit, signaling reduced airflow into the engine.	Dirty or clogged primary or secondary air filter element, collapsed intake hose, or a faulty restriction indicator itself.	Service or replace the air filter element, inspect intake piping for collapse or leaks, reset the restriction indicator.
Engine Overspeed shutdown trip	The overspeed contactor on the tachometer drive has detected excessive engine RPM and energized the fuel shutoff solenoid, stopping the engine.	Sudden release of load causing an RPM spike, governor linkage fault, or a worn/misadjusted overspeed contactor giving a false trip.	Determine the cause of the RPM spike, push the overspeed contactor reset button, inspect governor linkage before restarting.
Master action lamp / alarm - Category 2 or 3 general trip	One or more monitored systems has crossed into a warning or shutdown category; the shared master action lamp flashes and the audible alarm sounds.	Any single Category 2 or 3 condition above (coolant temperature, hydraulic oil temperature, low oil pressure) triggering the common alarm circuit.	Identify which individual gauge or indicator is active and address that specific system first; do not continue operating until cleared.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

330B attachments & work tools

Buckets

GD/general-purpose and HD/HDR heavy-duty rock buckets for this class run roughly 1.2-2.1 m3 (1.6-2.7 cu yd) struck/heaped capacity, with common widths around 1.5-1.7 m (60-66 in). The factory bucket lineup for this machine also includes a ditch-cleaning profile and a heavy-duty rock-ripping profile for poorly fragmented rock. Pin-on mounting is standard; coupler mounting is available where the tool-control/coupler circuit is fitted. Bucket linkage comes in two distinct factory configurations with different bucket-cylinder bore and stroke, so pin diameter (roughly 90 mm up to about 100 mm) and bucket width vary by configuration - confirm linkage type before ordering.

Hydraulic hammers

At roughly 32-33 tonne (71,000-72,000 lb) operating weight this machine falls in the mid-size breaker class matched to carriers in the 28-35 tonne range, typically a hammer in the 2,500-3,500 kg operating-weight bracket. Match the hammer to actual configured weight and stick length; a long-reach or extended-stick setup should run a lighter hammer than a standard-reach unit to protect the boom and stick.

Quick couplers

The factory tool-control option adds a coupler circuit sized for a pin-grabber style coupler. Aftermarket wedge-type and pin-grabber couplers are also built for the DB-type linkage shared across this size class. Coupler selection should match whichever bucket-linkage configuration is actually fitted, since pin spacing and pin diameter differ between the two factory linkage families.

Thumbs/grapples

Hydraulic (cylinder-actuated) and mechanical (pin-adjustable) thumbs mount to the stick/bucket linkage for sorting, loading, and handling irregular material. Grapple and clamshell attachments pin on the same linkage or mount through the quick coupler for demolition and material-handling work; the factory attachment lineup for this class also covers rotators and pulverizers alongside grapples.

Rippers

A single-shank, pin-on ripper built to the same DB-type linkage as the bucket is the typical configuration for this size class. Units sized for this weight class run around 700-800 kg (1,600-1,800 lb) with a shank roughly 1.3 m (50 in) long, used for ripping frozen ground, hardpan, or light rock ahead of digging.

Hydraulic-kit notes

An auxiliary hydraulic valve is standard equipment. The factory tool-control option adds a high-pressure circuit selectable one-way or two-way (for hammers and shears) plus a separate medium-pressure circuit for rotating or tilting tools such as thumbs, rotators, and pulverizers. Main implement-circuit relief pressure runs about 340 bar (4,970-4,980 psi), so any aftermarket tool circuit must be set within that limit.

All 330B assemblies by section

Every catalogued assembly group for the Caterpillar 330B. 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

See all parts with full part numbers in Heavy Parts AI →

Cp-1384653 Control Gp-Foot

13***53

Control Group-Foot

See all parts with full part numbers in Heavy Parts AI →

Cp-1534157 Harness As

15***57

Harness As

See all parts with full part numbers in Heavy Parts AI →

Cp-1415403 Harness As

14***03

Harness As

See all parts with full part numbers in Heavy Parts AI →

Cp-1534110 Harness As

15***10

Harness As

See all parts with full part numbers in Heavy Parts AI →

Cp-1534156 Harness As.

15***56

Harness As.

See all parts with full part numbers in Heavy Parts AI →

Cp-1534159 Harness As.

15***59

Harness As.

See all parts with full part numbers in Heavy Parts AI →

Cp-1534109 Harness As.

15***09

Harness As.

See all parts with full part numbers in Heavy Parts AI →

Cp-1415418 Panel Gp-Relay

14***18

Panel Group-Relay

See all parts with full part numbers in Heavy Parts AI →

1415401 Wiring Gp-Auxiliary Control

14***01	Wiring Group-Auxiliary Control	1
14***03	Harness As	1
14***18	Panel Group-Relay	1
8T***99	Bolt-Plt; (M8 X 1.25 X 12)	4

See all parts with full part numbers in Heavy Parts AI →

Cp-1534111 Wiring Gp-Auxiliary Control

15***11

Wiring Group-Auxiliary Control

See all parts with full part numbers in Heavy Parts AI →

Cp-1534132 Wiring Gp-Auxiliary Control

15***32

Wiring Group-Auxiliary Control

See all parts with full part numbers in Heavy Parts AI →

Cp-1284946 Wiring Gp-Auxiliary Control

12***46

Wiring Group-Auxiliary Control

See all parts with full part numbers in Heavy Parts AI →

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
14***21	Control Ar	1

See all parts with full part numbers in Heavy Parts AI →

Cp-1384652 Control Gp-Joystick

13***52

Control Group-Joystick

See all parts with full part numbers in Heavy Parts AI →

Cp-1297999 Drive Gp-Pump

12***99

Drive Group-Pump

See all parts with full part numbers in Heavy Parts AI →

Cp-1446364 Hose As

14***64

Hose As

See all parts with full part numbers in Heavy Parts AI →

Cp-2q4982 Hose As

2Q***82

Hose As

See all parts with full part numbers in Heavy Parts AI →

Cp-2q4981 Hose As

2Q***81

Hose As

See all parts with full part numbers in Heavy Parts AI →

Cp-1384664 Hydraulic Ar

13***64

Hydraulic Ar

See all parts with full part numbers in Heavy Parts AI →

Cp-1466516 Lines Gp-Hydraulic

14***16

Lines Group

See all parts with full part numbers in Heavy Parts AI →

Cp-1389140 Lines Gp-Rotator

13***40

Lines Group Rotator

See all parts with full part numbers in Heavy Parts AI →

Cp-1345377 Lines Gp-Auxiliary Hydraulic

13***77

Lines Group-Auxiliary Hydraulic

See all parts with full part numbers in Heavy Parts AI →

Cp-1335639 Lines Gp-Auxiliary Hydraulic

13***39

Lines Group-Auxiliary Hydraulic

See all parts with full part numbers in Heavy Parts AI →

Cp-1389118 Lines Gp-Boom

13***18

Lines Group-Boom

See all parts with full part numbers in Heavy Parts AI →

Cp-1384657 Lines Gp-Boom

13***57

Lines Group-Boom

See all parts with full part numbers in Heavy Parts AI →

Cp-1389119 Lines Gp-Drain

13***19

Lines Group-Drain

See all parts with full part numbers in Heavy Parts AI →

Cp-1389141 Lines Gp-Drain

13***41

Lines Group-Drain

See all parts with full part numbers in Heavy Parts AI →

Cp-1652721 Lines Gp-Front

16***21

Lines Group-Front; Lines Gp Front

See all parts with full part numbers in Heavy Parts AI →

Cp-1652722 Lines Gp-Front

16***22

Lines Group-Front; Lines Gp Front

See all parts with full part numbers in Heavy Parts AI →

Cp-1652723 Lines Gp-Pilot

16***23

Lines Group-Pilot; Lines Gp Pilot-C

See all parts with full part numbers in Heavy Parts AI →

Cp-1623275 Lines Gp-Pilot

16***75

Lines Group-Pilot; Lines Gp Pilot C

See all parts with full part numbers in Heavy Parts AI →

Cp-1353332 Lines Gp-Rotator

13***32

Lines Group-Rotator

See all parts with full part numbers in Heavy Parts AI →

Cp-1389100 Lines Gp-Stick

13***00

Lines Group-Stick

See all parts with full part numbers in Heavy Parts AI →

Cp-1399347 Lines Gp-Stick

13***47

Lines Group-Stick

See all parts with full part numbers in Heavy Parts AI →

Cp-1389102 Lines Gp-Stick

13***02

Lines Group-Stick

See all parts with full part numbers in Heavy Parts AI →

Cp-2z9810 Lines Gp-Stick

2Z***10

Lines Group-Stick

See all parts with full part numbers in Heavy Parts AI →

Cp-2z9804 Lines Gp-Stick

2Z***04

Lines Group-Stick

See all parts with full part numbers in Heavy Parts AI →

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
8T***56	Bolt-Plt; (M12 X 1.75 X 35)	4

See all parts with full part numbers in Heavy Parts AI →

Cp-6c6746 Valve Gp

6C***46

Valve Group

See all parts with full part numbers in Heavy Parts AI →

Cp-1443613 Valve Gp-Auxiliary Manifold

14***13

Valve Group-Auxiliary Manifold

See all parts with full part numbers in Heavy Parts AI →

Implements

Cp-1389112 Installation Ar

13***12

Installation Ar

See all parts with full part numbers in Heavy Parts AI →

Cp-1399344 Installation Ar

13***44

Installation Ar

See all parts with full part numbers in Heavy Parts AI →

Cp-1399342 Installation Ar

13***42

Installation Ar

See all parts with full part numbers in Heavy Parts AI →

Cp-1399346 Installation Ar.

13***46

Installation Ar.

See all parts with full part numbers in Heavy Parts AI →

Service Equipment And Supplies

Cp-1287866 Film Gp

12***66

Film Group; Film Gp-Combined Function

See all parts with full part numbers in Heavy Parts AI →

330B serial number reference

The PIN plate sits on the right side of the cab exterior, below the window; some pre-2001 330B units also carry a duplicate plate inside the cab near the operator's seat or right-foot area. On pre-2001 machines the serial number is an 8-character string: the first 3 characters are the prefix identifying the model and manufacturing block, and the last 5 digits are the sequence number for that run. Match the 3-character prefix against the ranges above to identify which 330B configuration a given machine belongs to.

Prefix	Identifies	Notes
9HN	330B (standard undercarriage)	Standard-configuration 330B excavator. Cat 3306 turbocharged, aftercooled diesel.
8SR	330B / 330B L (undercarriage varies)	Appears on documentation covering both standard and long-undercarriage 330B builds. Cat 3306 diesel. Verify exact undercarriage against the PIN with your dealer.
2RR	330B (standard undercarriage)	Standard-configuration 330B excavator. Thin sourcing — confirm with dealer.
3YR	330B L (long undercarriage)	Long-undercarriage 330B. A minority of listings tag this same prefix as LN rather than L — confirm exact undercarriage with dealer.
6DR	330B L (long undercarriage)	Long-undercarriage 330B, Cat 3306 diesel. Some parts-catalog volumes bundle this range together with the base 330 model in the same book.
8TR	330B L (long undercarriage)	Long-undercarriage 330B. Cat 3306 diesel.
1JS	330B L (long undercarriage)	Long-undercarriage 330B. One listing lists a 3066 engine for this range, which conflicts with the 3306 fitted across the 330B/330B L line — treat as unconfirmed and verify against the PIN plate with your dealer before ordering engine parts.
1KS	330B L (long undercarriage)	Long-undercarriage 330B. One bundle listing groups it under a generic 330B manual set rather than 330B L specifically — confirm exact undercarriage with dealer.
5LR	330B LN (long-narrow undercarriage)	Long-narrow-undercarriage 330B. Some listings tag this same prefix as L rather than LN — confirm exact undercarriage with dealer.
5LS	330B / 330B L (undercarriage varies)	Appears on documentation covering both standard and long-undercarriage 330B builds. Verify exact undercarriage against the PIN with your dealer.
4RS	330B / 330B L (undercarriage varies)	Appears on documentation covering both standard and long-undercarriage 330B builds. Verify exact undercarriage against the PIN with your dealer.

Frequently asked questions

What engine does the Caterpillar 330B use?

The 330B and 330B L share Caterpillar's 3306TA: a turbocharged and aftercooled, mechanically governed inline-six diesel displacing 10.5 L (640 cu in), rated 176 kW (236 hp) gross and 166 kW (222 hp) net at 1,800 rpm. It runs without an engine ECM; fuel delivery and governing are fully mechanical.

What is the operating weight of the Caterpillar 330B?

Operating weight varies by configuration. The standard-undercarriage 330B runs about 32.4 tonnes (71,500 lb); the long-undercarriage 330B L ranges roughly 33.7-34.7 tonnes (74,300-76,400 lb) depending on boom, stick, and counterweight. Check the machine's configuration plate for the exact figure.

What replaced the Caterpillar 330B?

Caterpillar replaced the 330B with the 330C starting in 2002. The 330C kept a similar size class but added electronic engine control, making the 330B the last mechanically governed, non-ECM generation of the 330 excavator line.

What 330B owners discuss

How does the Cat 3306 TA engine in the 330B hold up, and what starting problems come up?

Owners and mechanics rate the mechanically-governed 3306 TA as simple and durable - no electronics to chase, and with regular oil and filter service it runs a long service life. The recurring complaint is hard starting after the machine sits idle for several days: extended cranking and heavy smoke on light-off. Techs trace most of these to the injection pump - timing drift or wear, and on a pump rebuilt off the engine, timing set without a proper timing indicator (pin timing alone is described as less reliable on the 3306 than on the 3406). A second recurring thread is fuel finding its way into the crankcase through a worn injection pump. Several liters of fuel dilution in the oil before it is caught can wash out bearing oil film, so watch for oil level creeping up and a fuel smell at oil changes.

Why won't the engine rev up to meet hydraulic load on some 330B/330BL machines?

A repeated complaint on machines left in auto engine-speed mode: the engine blips up briefly on a joystick input, then drops straight back to low idle and never compensates once a real hydraulic load is applied, leaving the machine gutless under the bucket or boom. Community troubleshooting points first at the implement (hydraulic) pressure switch and its wiring - if that switch or circuit is bad, the governor never gets the load-applied signal needed to trigger auto-acceleration. Second suspect is the electronic throttle/accelerator unit needing recalibration, especially after a related part is replaced. Rule out plain low engine power (injection pump condition, air filter, turbo boost) before condemning the switch.

Does the hydraulic system run hot on these machines?

Hydraulic oil overheating is a common complaint on higher-hour 330B/330BL units, especially in warm climates. The pattern reported: a clogged or debris-packed oil cooler restricting airflow, low oil level, or a thermostatic bypass valve stuck so oil skips the cooler entirely. Sustained high tank temperature is not just an inconvenience - it cooks seals and shortens pump and motor life. Clean the cooler core, confirm oil level and condition, and verify the bypass valve actually opens before spending money chasing pump wear.

A stick or other function keeps moving after the joystick is centered - what is happening, and is it safe to keep running?

This comes up as a function (commonly the stick) continuing to travel in the last commanded direction after the control is released, sometimes running to the end of cylinder travel before it stops. Field test: drop the safety/pilot shutoff lever while the function is running away. If it stops immediately, the fault is in the pilot circuit - a leaking pilot valve section or a pressure-reducing valve not centering. If motion continues with pilot pressure locked out, the main control valve spool itself is sticking in its bore, a mechanical fault rather than an electrical one. An uncommanded function is a struck-by hazard for anyone near the machine. Treat it as out of service until diagnosed, and have your dealer verify the pilot system and main control valve before returning the machine to work.

What undercarriage and final-drive wear patterns are typical for a machine like this?

The most-cited final drive failure is the sprocket-side face seal letting go - first sign is gear oil weeping where the sprocket meets the final drive housing. Root cause is almost always packed debris around the final drive: dirt and mud jammed in tight can push the seal faces out of alignment, and every resulting scratch becomes a leak path. Daily undercarriage washdown is the standard preventive practice. Beyond the final drive, expect the usual age-and-duty wear on a machine this size - uneven track wear, worn roller and idler bearings, and track sag - all accelerated by working abrasive or muddy ground without regular cleaning and tension adjustment.

What electrical or monitor/sensor issues come up on the 330B?

The instrument/monitor panel is the component mechanics flag most: flickering displays and intermittent loss of power to the gauge cluster are common on machines this age, usually connector corrosion or a failing panel rather than a bad sensor. The monitor also raises its own communication fault when it loses contact with the machine controller, which points to wiring or a connector, not an engine problem. Beyond the panel, the coolant temperature sensor and the oil pressure switch feeding the gauge cluster and warning lights are the usual suspects when a warning lamp lights or a gauge stops reading with no real mechanical problem behind it. Check the sensor and its wiring with a shop gauge before condemning the engine.

What should a buyer check before purchasing a used 330B?

Beyond the standard leak-and-undercarriage walkaround: start the engine cold and watch for the hard-start/heavy-smoke pattern tied to injection pump wear; run every hydraulic function to full stroke and confirm nothing creeps or keeps moving once the joystick is released; watch the swing circuit for a brake that fails to release cleanly, especially if the swing motor shows signs of a prior rebuild; watch hydraulic tank temperature climb under sustained load, which flags a marginal cooler; and check boom and stick weld seams and pin/bushing wear as on any high-hour excavator. Owner comparisons between B-series and later C-series machines note some early 330B booms running past very high hours without structural weld cracking, so cracking on a 330B is more a sign of overload or abuse than a known design weakness. A mechanically simple engine and hydraulic system mean most faults on this machine are visible or audible during a careful walkaround rather than hidden in electronics.

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

Need a specific 330B part?

Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.

Search parts in the app