Caterpillarengine - machine(no series)

Caterpillar 3064

Maintenance schedule, common problems & OEM parts breakdown

The Cat 3064 (3064T) is a Mitsubishi-built four-cylinder turbocharged diesel, 102 mm bore by 130 mm stroke, 4.25 L displacement, with mechanical fuel injection and no engine ECM. It is the standard engine across Caterpillar's first two generations of mini and midi hydraulic excavators: 311, 311B, 311C, 312, 312B, 312C, 313C, and 314C, plus the compact 910G wheel loader. Gross power runs roughly 61 to 70 kW (82-94 hp) and flywheel power 59-67 kW, set by chassis and application. Host excavators span roughly 10.5 to 14.5 tonnes operating weight; the 910G loader is a lighter machine outside that band. Production ran from the early-to-mid 1990s launch of the 311 and 312 through the mid-to-late 2000s close of the 312C, 313C, and 314C, after which Caterpillar moved this size class to the electronically controlled C4.2 ACERT engine in the D-series. Configurations offered on this engine platform include standard crawler booms, long-reach utility variants such as the 311C U and 312C L, and short-tail-swing variants such as the 314C CR and LCR.

Across the run, the airframe changed more than the engine. The B-series added sliding seat and console mounts for cab comfort. The C-series brought onboard electronic diagnostics, a redesigned high-efficiency hydraulic system with automatic boom and swing priority in place of separate work and power mode switches, and Tier 3 emissions compliance without exhaust aftertreatment, while the 3064/3064T itself stayed a simple mechanical, non-ECM engine throughout. That mechanical simplicity is why this engine still matters in the used and parts market: no ECM, no diesel particulate filter, and no emissions plumbing to fail, paired with a well-proven bottom end, make 311 through 314C-era machines a low-cost, easy-to-diagnose entry point for owner-operators. The 3064T also remains a common runner and parts-donor swap across other mechanically injected Cat mini excavators of the same era.

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 3064 specifications

Engine

Engine model	Cat 3064T, four-cylinder turbocharged diesel (Mitsubishi S4K-T lineage, built for Caterpillar). No naturally aspirated non-turbo variant is documented for this engine in the factory spec sheets reviewed; every confirmed source lists it as "3064T."
Gross power	61-70 kW (82-94 hp). Rating is set by the host excavator: about 61 kW (82 hp) on the Cat 311C Utility, about 70 kW (94 hp) on the Cat 312C/312C L and 314C CR/LCR.
Net/flywheel power (ISO 9249 / SAE J1349 / EEC 80/1269)	59-67 kW (79-90 hp), varies with host machine and equipment level.
Displacement	4.25 L (259 in3)
Cylinders	4, inline
Bore x stroke	102 mm x 130 mm (4.0 in x 5.1 in)
Aspiration / fuel system	Turbocharged, direct injection diesel
Emissions tier	Not documented in the factory spec sheets reviewed for this engine. Verify certification level for a given serial range with your dealer.

Weights

Engine dry weight	Not published for this engine in the factory literature or engine-data references reviewed.
Host machine operating weight	Varies by excavator model and configuration, not by the engine itself: roughly 11,900-12,600 kg (26,300-27,700 lb) on the Cat 311C Utility, up to about 13,500-14,810 kg (29,800-32,590 lb) on the Cat 314C CR/LCR, depending on undercarriage length, track shoe width, stick, and blade.
Ground pressure	Host-dependent: roughly 28-44 kPa (4.0-6.4 psi) across the excavator models using this engine, varying with track shoe width and undercarriage length.

Dimensions

Engine block dimensions	Not published for this engine in the sources reviewed.
Host machine transport dimensions	Vary by excavator model, not by the engine: shipping length about 6.9-7.4 m (22'8"-24'4"), track gauge about 1.99 m (6'6"), ground clearance about 0.445-0.455 m (1'5"-1'6") across the Cat 311-314 C-series machines this engine powers.
Transport width	Host-dependent, driven by track shoe width: roughly 2.49-2.76 m (8'2"-9'1") depending on shoe option and excavator model.

Performance

Travel speed	About 5.5-5.6 kph (3.4 mph) across the excavator hosts using this engine. A host-machine drivetrain figure, not an engine rating.
Max drawbar pull	Host-dependent: about 92-110 kN (20,680-24,730 lb) depending on excavator model.
Swing torque / speed	About 30,900-31,270 N.m (22,790-23,060 lb ft) at 10.6-12.6 rpm. Varies by host machine.
Gradeability	Not published in the spec sheets reviewed.

Service capacities (summary)

Engine oil	17.5-19.5 L (4.6-5.2 gal), varies slightly by host machine.
Cooling system	17.5 L (4.6 gal)
Fuel tank	195-200 L (51.5-52.8 gal). A host-machine tank capacity, not an engine spec.
Hydraulic system	Not an engine attribute; belongs to the host excavator. Roughly 150-160 L (39.6-42.3 gal) including tank across confirmed hosts.

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

3064 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with oil filter)	12.9-17.5 L (3.4-4.6 US gal); the smaller 79 hp-rated host chassis runs toward the low end, the 90-94 hp turbo-rated hosts toward the high end	Cat DEO (Diesel Engine Oil) SAE 15W-40 for standard ambient service, about -9.5 to 50 C (15 to 122 F). Cat DEO SAE 10W-30 for cooler climates, about -18 to 40 C (0 to 104 F). Full-synthetic Cat Arctic DEO SAE 0W-30 for sustained sub-zero starts, down to about -40 C (-40 F).
Cooling system	15.6-17.5 L (4.1-4.6 US gal), varies by host chassis and radiator sizing	Standard factory fill is Cat DEAC, a conventional heavy-duty antifreeze/coolant, pre-mixed with water. Cat ELC (Extended Life Coolant), rated to about -50 C (-58 F), is offered as a factory option and runs a longer service interval without supplemental additives.
Fuel tank	200-250 L (52.8-66 US gal), depends on host machine and boom/stick/counterweight configuration	No. 2-D diesel fuel. Blend with No. 1-D diesel below about -7 C (20 F) to keep cold-weather flow.
Hydraulic system (including tank)	150-162 L (39.6-42.8 US gal)	Cat HYDO Advanced anti-wear hydraulic oil. Grade 10 for cold-to-moderate ambient, about -20 to 40 C (-4 to 104 F). Grade 30 for sustained hot ambient, about 0 to 50 C (32 to 122 F).
Hydraulic tank	90-120 L (23.8-31.7 US gal)	Same Cat HYDO Advanced fluid and grade as the hydraulic system.
Swing drive	2.9-3 L (0.8 US gal)	Cat TDTO (Transmission/Drive Train Oil). SAE 30 in cold ambient, about -20 to 25 C (-4 to 77 F); SAE 40 in moderate ambient, about -10 to 40 C (14 to 104 F); SAE 50 in hot ambient, about 0 to 50 C (32 to 122 F).
Final drive (each)	2.5-2.7 L (0.66-0.7 US gal)	Same Cat TDTO grade selection as the swing drive, chosen by ambient temperature.
Grease (all points)	Not capacity-rated; serviced per grease-fitting interval, not a fill volume	Cat MPGM (Multipurpose Grease), NLGI 2 with moly (molybdenum disulfide) additive, for standard climates. Switch to an NLGI 1 or arctic-grade grease in sustained sub-zero conditions for easier gun flow.

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

Caterpillar 3064 maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and coolant level before starting. Drain water and sediment from the fuel/water separator. Check hydraulic oil level and inspect boom, stick, and bucket linkage for leaks or loose pins. Check the air cleaner service indicator and clear debris from the cooling fan guard. Grease boom, stick, and bucket pivot and cylinder pins weekly, or daily in wet or muddy conditions. Check track tension on crawler hosts, or tire condition and wheel nut torque on the 910G loader.
Every 250 h	Change engine oil and the engine oil filter. Check alternator and fan belt tension and inspect for cracking or glazing. Check battery electrolyte level and clean and tighten terminals. Check swing drive and final drive gear oil levels. Clean or replace the cab fresh-air filter.
Every 500 h	Replace the engine fuel filter elements. Pull an oil and coolant sample for analysis and check coolant condition and level. Inspect turbocharger mounting, boost hoses, and clamps for leaks or cracking. Service the hydraulic tank breather. Check swing bearing bolt torque.
Every 1,000 h	Change swing drive and final drive gear oil. Change the hydraulic oil filter element. Inspect alternator and starter motor wiring and output. Check and adjust track sag on crawler machines, or wheel bearing preload on the 910G. Change engine coolant if running conventional, non-extended-life coolant.
Every 2,000 h	Inspect and adjust engine valve lash on inlet and exhaust valves. Inspect fuel injection nozzles and check injection pump timing. Change the hydraulic tank oil. Inspect turbocharger shaft end play and wheel clearance. Inspect engine and equipment mounts for wear or cracking.
Every 4,000 h	Inspect fuel injectors and recondition or replace worn units. Inspect the crankshaft vibration damper and pulley for cracks or looseness. Pressure-test the cooling system and radiator cap. Inspect the turbocharger center housing and rebuild if shaft play is out of tolerance.
Every 6,000 h	Replace extended-life coolant and flush the cooling system. Trend engine oil analysis results and check cylinder compression to plan an in-frame overhaul. Inspect the swing bearing and gear teeth for wear. Assess undercarriage sprockets, rollers, idlers, and track chain, or drivetrain components on the 910G, for rebuild.

Servicing the 3064 beyond the schedule

Predictive Maintenance & Fluid Analysis

Run oil and coolant sampling every 250 to 500 hours. The 3064T has no ECM, so fluid analysis is the earliest warning of injector wear, turbocharger bearing wash-down, or coolant intrusion on this mechanically governed engine. Track fuel filter change intervals closely: injection pump and nozzles are wear items on this engine family, and dirty fuel accelerates wear faster than on later common-rail Cat engines. Trend swing drive and final drive oil samples alongside engine oil to catch gear wear before it reaches the case.

Corrective & Common Repairs

Expect turbocharger wear, injection pump timing drift, and starter or alternator wiring faults as the most common corrective jobs on 3064 and 3064T powered machines. Boom and stick pin and bushing wear is typical on high-hour 311 through 314C carriers; grease intervals slip easily on job sites and accelerate pin wear. Track tension and sprocket wear on crawler hosts, or wheel bearing and steering cylinder wear on the 910G, are frequent undercarriage repairs. Because the engine predates electronic diagnostics, fault-finding stays mechanical: compression, injector pop-off pressure, and boost leak checks.

Overhaul & Rebuild Points

At major overhaul, focus on the turbocharger center housing, the injection pump and nozzle set, and cylinder liner and ring wear; these are the highest-wear areas across the 3064T's service life. On the machine side, rebuild the swing bearing and gear teeth, final drive planetaries, and undercarriage components as a set, since they wear together on crawler hosts. Check and reset valve lash, injection timing, and turbo shaft play together at rebuild, not independently, to keep the mechanical fuel system in balance.

Seasonal & Environment Servicing

Before cold-weather operation, confirm coolant freeze protection and battery condition. The mechanically injected 3064T has no ECM-assisted cold start beyond a basic ether or intake-air heater, so cranking speed and battery health matter more than on later engines. Drain fuel/water separators more often in wet or humid climates to protect the injection pump from water intrusion. In hot, dusty conditions, clean the radiator and oil cooler cores and check turbo boost hose clamps more often, since this engine relies on airflow alone, not an ECM-managed derate, to avoid overheating.

3064 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
E1	Engine oil pressure below normal	Low oil level, failing oil pressure switch or sender, worn oil pump or bearings	Stop the engine if the light stays lit at idle. Check oil level first, then verify pressure with a mechanical test gauge before restarting
E2	Engine coolant temperature above normal	Low coolant level, clogged radiator core, slipping or broken fan belt, stuck thermostat	Shut down and let the engine cool. Check coolant level and radiator fins, then inspect belt tension
E3	Hydraulic oil temperature above normal	Low hydraulic oil level, oil cooler fins clogged with debris, relief valve stuck, sustained heavy load in hot ambient conditions	Idle the machine to cool the circuit, check hydraulic oil level, and clean the cooler fins
E4	Battery/charging voltage above normal	Failed voltage regulator inside the alternator, bad battery cell	Check charging voltage at the battery with the engine running. Replace the alternator or regulator if voltage is out of spec
E5	Alternator output signal lost or disconnected	Loose or corroded alternator wiring, worn brushes, failed alternator, disconnected charge-sense lead	Inspect the alternator harness and connector, then confirm alternator output with a multimeter
E6	Engine speed sensor not detected or circuit open	Speed sensor unplugged or not fully seated, damaged sensor wiring, broken connector pins	Inspect the speed sensor mounting and wiring, reseat and tighten the sensor, clean the connector
E7	Engine speed reading abnormal versus commanded throttle setting	Slipping fan belt (the monitor infers speed from alternator output), misadjusted throttle linkage, degrading speed sensor signal	Check fan belt tension and throttle linkage travel first, then recheck the speed signal in the monitor's diagnostic mode
E31	Sensed engine speed does not match the throttle dial setting	Loose or worn fan belt driving the alternator used as the speed reference, weak alternator charge signal, throttle dial out of calibration	Check and tighten or replace the fan belt first, then verify the alternator signal in the monitor's diagnostic sub-mode before replacing any sensor

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

3064 attachments & work tools

Host machine and size class

The 3064/3064T engine is not a standalone attachment host — it powers the Cat 311/311B/311C and 312/312B/312C small hydraulic excavator family, roughly an 11-13 metric ton (25,000-28,000 lb) class machine. Work-tool coverage below reflects what this excavator size class actually runs, not the bare engine.

Buckets — general purpose

General purpose buckets for this class run roughly 0.3-0.65 cubic meter capacity in widths from about 450 mm up to 900 mm, with a toothed cutting edge for general digging and trenching. Capacity varies by series and bucket profile, so treat these as class-typical, not fixed.

Buckets — heavy duty / rock

Heavy-duty and severe-duty (rock) buckets are offered in narrower widths, roughly 600-900 mm, built with heavier wear plates and a reinforced cutting edge for abrasive or rocky digging. These trade capacity for durability versus the general purpose bucket.

Buckets — ditching / clean-up

Wider, shallower ditching or clean-up buckets are available for grading and channel work, typically wider than the general purpose bucket at similar or lower capacity, sometimes offered with a tilt function on this class.

Quick couplers

Both a mechanical pin-grabber quick coupler and a hydraulic (pin-grabber or wedge-style) quick coupler are offered for this excavator class, letting the operator swap buckets, hammers, thumbs, and grapples without pinning tools by hand. The hydraulic version needs its own control circuit routed to the boom foot.

Hydraulic hammers / breakers

Hammer sizing for an 11-13 ton carrier lands in the class matched to roughly 7-9 ton mini excavators through the lower end of this machine's own weight range, selected by matching hammer service weight and flow/pressure to the carrier rather than by model number alone. Hammers run on a one-way auxiliary hydraulic circuit.

Hydraulic thumbs

A hydraulic or pin-on thumb is offered for this class, sharing the bucket linkage or coupler pivot point rather than needing a separate mount. A powered (hydraulic) thumb needs a two-way auxiliary circuit; a pin-on thumb needs no hydraulics at all.

Compaction wheels

A pin-on compaction wheel attachment is offered across this excavator class for backfill and trench compaction, sized to the machine's stick and coupler pins rather than requiring a hydraulic circuit.

Grapples

Demolition and sorting grapples sized for this class are available, generally rotating types that need a powered rotation circuit in addition to the open/close function, so they call for a two-way auxiliary hydraulic setup with rotation control.

Auxiliary hydraulic plumbing / factory kits

Factory and dealer-installed hydraulic kits for this excavator size class offer one-way, two-way, or a combined one/two-way arrangement, with auxiliary hydraulic and electrical lines routed to the boom foot. One-way flow suits hammers and compactors; two-way suits thumbs and other double-acting or rotating tools, and kit selection is tied to the specific machine configuration.

All 3064 assemblies by section

Every catalogued assembly group for the Caterpillar 3064. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Electrical System

5q3618 Control Gp-Electronic

5Q***18

Control Group-Electronic

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

Engine Arrangement

5q3616 Engine Ar - Part 1 Of 2

5I***62	Flywheel Group	1
5I***63	Gear Group-Front	1
5I***00	Cylinder Head Group	1
5I***01	Valve Mechanism Group	1

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

5q3616 Engine Ar - Part 2 Of 2

5I***06	Nozzle Group-Unit Injector	4
5I***16	Starting Motor Group-Electric	1
5I***73	Pump Group-Water	1
5I***10	Manifold Group-Inlet	1

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

Fuel System And Governor

5q3617 Pump Gp-Fuel Injection - Part 5 Of 6

5Q***17

Pump Group-Fuel Injection

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

5q3617 Pump Gp-Fuel Injection - Part 4 Of 6

5Q***17

Pump Group-Fuel Injection

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

5q3617 Pump Gp-Fuel Injection - Part 6 Of 6

5Q***17

Pump Group-Fuel Injection

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

5q3617 Pump Gp-Fuel Injection - Part 1 Of 6

5Q***17

Pump Group-Fuel Injection

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

5q3617 Pump Gp-Fuel Injection - Part 2 Of 6

5Q***17

Pump Group-Fuel Injection

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

5q3617 Pump Gp-Fuel Injection - Part 3 Of 6

5Q***17

Pump Group-Fuel Injection

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

3064 serial number reference

The 3064 is sold as a bare industrial/machine engine, so it carries its own engine serial number plate rather than relying on the host machine's PIN plate. The plate is fixed to the engine block, typically near the fuel injection pump or timing gear housing at the front of the engine. Read the three-letter prefix to identify the engine build lot, and the digits that follow as the sequential unit number; the excavator or loader carrying the engine has its own separate machine PIN elsewhere on the frame.

Prefix	Identifies	Notes
6LK	3064 / 3064T 4-cylinder turbocharged industrial engine	Only documented serial prefix for this engine. Fitted in Cat 311, 311B, 311C, 312, 312B, and 312C mini excavators, the 314C small excavator, and the 910G compact wheel loader. Rated power varies by host machine and tuning (roughly 59-67 kW / 79-90 hp across the line); check the specific machine's spec plate for the exact rating. No separate prefix found for a non-turbo build or for a 910G-only serial break; confirm with a dealer parts lookup if the unit in hand falls outside this range.

Frequently asked questions

What engine powers the Cat 3064/3064T machine line?

A Mitsubishi-built four-cylinder turbocharged diesel with 102 mm bore, 130 mm stroke, and 4.25 L displacement. It is mechanically fuel-injected with no engine ECM, and gross power runs roughly 61 to 70 kW (82-94 hp) depending on the host machine and series.

What is the operating weight range for 3064/3064T-powered machines?

Host excavators, 311 through 314C, run roughly 10.5 to 14.5 tonnes operating weight depending on series and boom or stick configuration. The 910G compact wheel loader sits well below that band. Exact weight varies by counterweight, undercarriage, and attachment.

What replaced the 3064/3064T in Caterpillar's mini excavator line?

Caterpillar moved this size class to the electronically controlled Cat C4.2 ACERT engine in the D-series excavators under Tier 3 rules, later followed by the C4.4 ACERT engine with exhaust aftertreatment in the E-series. The 3064/3064T's mechanical, non-ECM design was retired as emissions standards tightened.

What 3064 owners discuss

What do owners report about hydraulic performance once a 3064-powered excavator warms up?

Owners of 311/312-series machines report that hydraulic functions - swing, travel, boom - all slow down once the machine reaches full operating temperature, most noticeably at travel speed. Digging often still feels normal while travel drags, which points at the main pump's proportional reducing valve (PRV) and its governor solenoid trimming pump output as oil heats and load rises, not a weak engine. Before condemning the pump, owners recalibrate the pump governor through the monitor and check the PRV solenoid against factory resistance spec. Have your dealer verify pump calibration and solenoid readings before any pump replacement.

Is there a known engine difference across the 311/312 and 313C/314C series machines?

Yes. The 3064 family fitted to these excavators includes both a naturally aspirated 3064 and a turbocharged 3064T, both derived from the Mitsubishi S4K-T block. Most 311B/311C, 312B/312C, all 313C/314C, and the 910G loader run the turbo 3064T; some earlier or lighter units carry the non-turbo version. Turbo machines pull noticeably harder under load and at altitude, matching the added boost. Because the 3064 name gets reused across generations and both aspirations, owners confirm the actual engine variant from the engine serial plate rather than assuming it from the machine model, since turbo-specific service items are not interchangeable with the naturally aspirated engine.

What undercarriage and wear patterns are typical for this excavator class?

In this 11-15 tonne mini/midi class, track rails wear out well before rollers, idlers, or sprockets on machines that see heavy travel on rock or abrasive ground. Slew ring and swing bearing play is the wear item buyers worry about most, since it is one of the costliest repairs on a machine this size - rotate the house a quarter turn and feel or listen for play or knock. Pin and bushing wear at the boom, stick, and bucket linkage is the other recurring complaint, usually traced to stretched grease intervals rather than a design issue.

What hydraulic component failures come up repeatedly on these machines?

Swing (slew) motor case-drain and swivel seal leaks show up often on this size of excavator, not just this model. The seal under the swing gear sits where wear debris from the gears settles and acts as a grinding compound over time; keeping hydraulic oil changes on schedule slows this wear but does not prevent it. Once a swivel starts weeping, owners find it more cost effective to pull and reseal the whole swivel and motor assembly than to chase individual fittings for the leak. Separately, some owners report the main hydraulic pump needing replacement well into the machine's service life; reported hours vary widely by duty cycle and maintenance history, so judge pump condition on inspection rather than the hour meter alone.

What electrical or sensor issues come up most on the 3064-powered excavators?

Two issues dominate. First, throttle control wiring: on 311B/312B-era machines the throttle cable and its harness run close to the muffler, and a corroded muffler can radiate enough heat to melt the insulation, causing intermittent or dead throttle response that looks like an ECM fault but is not. Second, a high-temperature warning lamp lighting during heavy work at lower RPM is often traced to a cracked plastic fan or a slipping, glazed belt rather than a failed coolant temperature sensor, so owners check the fan and belt before swapping the sensor. For any other electrical gremlin, owners check battery terminal corrosion, keyswitch fuses, and main relay connections first, since those turn up more often than an actual module failure. Have your dealer verify any ECM, sensor, or module replacement with a full diagnostic before parts are swapped.

What should a buyer check specifically when looking at a used 3064-powered 311/312/313C/314C?

Beyond the general used-excavator basics - frame welds, cylinder and hose leaks, pin and bushing play, slew ring movement - buyers of this engine and machine combination should also: confirm from the engine serial plate whether it is the naturally aspirated 3064 or the turbo 3064T, since running characteristics and service needs differ; run the machine to full operating temperature and cycle every function, not just at idle, to catch the heat-related slowdown some owners report; check the swing motor swivel area and the ground under the pump for seepage that signals early swivel-seal wear; and inspect the throttle cable routing near the muffler for heat damage. Have your dealer or a qualified independent mechanic verify governor and PRV calibration and run a full diagnostic before you commit to purchase.

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

Need a specific 3064 part?

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

Search parts in the app