Caterpillarexcavator

Caterpillar E140

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar E140 is a roughly 14-tonne (30,800 lb) class hydraulic excavator built during the Caterpillar-Mitsubishi joint venture era at the Akashi, Japan plant, with production dating to the late 1980s into the early 1990s. Power comes from a Mitsubishi-built 6D14 turbocharged inline-6, 6.6 liter (400 cu in) diesel rated near 66 kW (88.5 hp) gross, running a fully mechanical fuel system and controls with no electronic engine management. It carries a serial prefix of 1NF and sits in the same Japan-built E-series lineup as the E70B, E110B, E120, E180, E200B, and E240, sharing chassis, pump, and undercarriage architecture across several of those models. Standard configuration used a mechanical boom/stick/bucket front with conventional track undercarriage; no distinct long-reach or dedicated demolition factory configuration for this specific model is documented in surviving parts literature, so assume a general-purpose backhoe front unless a specific machine's attachment history says otherwise.

No confirmed direct factory predecessor is documented for the E140 by model name; it should be treated as a standalone member of the first-generation E-series rather than a numbered successor to an earlier Cat or Mitsubishi excavator. The wider E-series moved to a lettered B-suffix update in the late 1980s (E110B, E120B, E140B, E200B, E240B), carrying the same Mitsubishi-sourced mechanical driveline forward with running changes to hydraulics and controls; a direct factory statement tying the base E140 to the E140B by name was not found, so treat the B-series as the likely successor pattern rather than confirmed lineage. In the used and parts market today, the E140 matters mainly as a simple, pre-electronic machine still running in some fleets where a mechanical engine and lack of emissions controls are valued for serviceability. Cat's own parts network has long since shifted focus to later, Cat-engineered excavator platforms, so sourcing for this machine leans heavily on undercarriage specialists and general aftermarket suppliers rather than dealer counter stock, and buyers should expect increasing obsolescence risk on hydraulic pump, injection pump, and turbocharger components.

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 E140 specifications

Engine

Engine model	Mitsubishi 6D14 (listed on Cat spec sheets as C 6D14)
Cylinders	6, inline diesel
Gross/net power	66 kW (88.5-89 hp); listed as both gross and net depending on the spec sheet
Displacement	6.6 L (400 cu in / 6,561 cc)
Emissions tier	Pre-emissions-regulation era machine (built circa late 1980s-early 1990s); no tier rating documented
Engine family note	Same 6D14 base engine also used in sibling E120 and E180 excavators; power rating is specific to the E140 tuning per available sheets

Weights

Operating weight	13,970 kg (30,799 lb)
Ground pressure	46.2 kPa (6.7 psi)
Transport weight	Not documented separately from operating weight in available sources

Dimensions

Transport length (track length on ground)	2.70 m (8 ft 11 in)
Transport width (over tracks)	2.49 m (8 ft 2 in)
Transport height (to cab top)	2.89-2.90 m (9 ft 6 in)
Tail swing radius	2.44 m (8 ft 0 in)
Track shoe width	500 mm (19.7 in)
Ground clearance	430 mm (1 ft 5 in)
Track gauge	1.99 m (6 ft 6 in)
Overall operating footprint (length x width x height, boom stowed)	approx. 8 ft 5 in x 8 ft 4 in x 9 ft 6 in per general listings

Performance

Max dig depth	5.93-5.94 m (19 ft 5 in-19 ft 6 in), standard configuration
Max vertical wall dig depth	4.71-4.72 m (15 ft 6 in)
Max reach at ground	8.78-8.81 m (28 ft 10 in-28 ft 11 in)
Max loading/dump height	5.49-5.52 m (18 ft 0 in-18 ft 1 in)
Max cutting height	7.89-7.90 m (25 ft 11 in)
Travel speed (max)	3.0-3.1 km/h (1.9-2.0 mph); single travel range on this model
Drawbar pull	111 kN (24,504 lbf)
Swing speed	Not documented in available sources
Gradeability	Not documented in available sources

Forces

Bucket digging force	Not documented in available sources
Stick/arm digging force	Not documented in available sources

Service capacities (summary)

Fuel tank	240 L (63.5 gal)
Hydraulic system	220 L (58.2 gal)
Hydraulic relief valve pressure	26.4 MPa (3,830 psi)
Hydraulic pump flow	264 L/min (69.8 gpm)
Engine oil	Not documented in available sources
Cooling system	Not documented in available sources

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

E140 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not published in available spec sheets for this exact machine. The E140 runs the turbocharged Mitsubishi 6D14 inline-6 (Cat parts nomenclature lists it as C6D14, 6.6 L displacement); crankcases in this displacement class typically run in the 17-19 L (4.5-5.0 US gal) band. Confirm the exact figure against the OMM refill chart before a service fill.	Diesel engine oil to Cat DEO spec, API CD/CE performance level. SAE 15W-40 for general/warm climates; drop to SAE 10W-30 in sustained cold-start conditions per Cat's era multigrade guidance, SAE 30 or 40 straight-grade acceptable in consistently hot climates.
Cooling system	Approx. 30 L (7.9 US gal) for the engine coolant circuit — treat as an estimate; confirm against the OMM before ordering coolant.	Ethylene-glycol base antifreeze/coolant mixed with water per Cat's water-quality and glycol-concentration guidelines (typically 50/50 for freeze protection), consistent with the pre-ELC coolant spec used across Cat machines of this era. Follow the OMM's specific antifreeze concentration table for the expected ambient range.
Fuel tank	240 L (63.5 US gal)	No. 2-D diesel fuel meeting Cat's diesel fuel specification; switch to a winterized/No. 1-D blend in cold climates to keep the pour point below ambient.
Hydraulic system total	220 L (58.2 US gal), full system including tank, lines and cylinders	Cat TDTO (or equivalent anti-wear hydraulic oil meeting Cat's hydraulic system spec) is typical for excavators of this generation and displacement class. Viscosity grade should be selected by ambient temperature per the OMM's climate chart - lighter grade for cold-weather starts, heavier for sustained hot-climate operation.
Hydraulic tank (reservoir only)	Not separately published - only the full-system figure (220 L / 58.2 US gal) is documented in available specs; the reservoir-only refill volume will be lower than the system total. Confirm against the OMM.	Same fluid as hydraulic system total above.
Final drive (each)	Not documented in publicly available specs for this model. Confirm against the OMM or the housing fill/level plug.	Cat TDTO-type gear/final-drive oil (or equivalent EP gear lubricant) is the typical spec for excavator final drives of this class and era.
Swing drive	Not documented in publicly available specs for this model. Confirm against the OMM or the housing fill/level plug.	Cat TDTO-type gear oil (or equivalent EP gear lubricant), same family as the final drive fill; check the OMM for any viscosity difference between swing and travel gearboxes.
Grease (all pin/bushing points)	No fixed refill volume - applied as needed at each grease fitting per the lubrication schedule.	Cat multipurpose EP chassis grease, NLGI grade 2, for pins, bushings, and the swing bearing/gear.

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

Caterpillar E140 maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and coolant level before starting the 6D14 and top up as needed. Drain water and sediment from the fuel tank sump. Walk the machine and check for hydraulic oil leaks around cylinder rod seals, hose fittings, and the swing and travel final drives. Grease the bucket, stick, and boom linkage pins; grease more often in wet or abrasive digging. Check track tension and look for loose shoe bolts. Clean mud and debris from the radiator and oil cooler fins.
Every 250 h	Change engine oil and the engine oil filter on the 6D14. Inspect and clean the air cleaner element; replace if restricted. Check alternator and fan belt tension and condition. Grease the swing gear ring, center pivot, and travel motor mounting pins. Check battery electrolyte level and clean terminals. Check track shoe bolt torque and adjust track sag.
Every 500 h	Replace the fuel filter element and bleed air from the mechanical fuel system. Replace the hydraulic tank return-line filter element. Check and top up gear oil in the swing drive and both travel final drives. Inspect the turbocharger for shaft play, oil leakage, and exhaust smoke color under load. Check the injection pump governor linkage for wear and free movement. Retorque the swing bearing mounting bolts.
Every 1,000 h	Change gear oil in the swing drive housing and both travel final drives. Check and adjust intake and exhaust valve clearance on the 6D14. Check injection pump timing against the mechanical timing mark. Inspect main hydraulic pump and control valve for abnormal noise, heat, or flow loss. Inspect boom, stick, and bucket pins and bushings for wear; replace worn bushings. Check idler and roller mounting bolts and undercarriage wear.
Every 2,000 h	Change the hydraulic tank oil and clean the suction strainer. Flush and refill engine coolant. Pull and inspect injectors; send out for cleaning and calibration if spray pattern is uneven. Check swing bearing raceway backlash and bolt torque. Inspect track rollers, idlers, and sprockets for wear against service limits. Check travel motor and swing motor internal leakage (drift test).
Every 4,000 h	Overhaul or exchange the turbocharger if boost or oil consumption has drifted out of spec. Rebuild or exchange the main hydraulic pump and swing/travel motors showing flow or pressure loss. Replace track chains, rollers, idlers, and sprockets once past wear limits. Inspect the engine top end (head, valves, injectors) for a rebuild if oil consumption or smoke has increased. Reseal or replace the swing bearing if backlash exceeds the service limit.

Servicing the E140 beyond the schedule

Predictive Maintenance & Fluid Analysis

There is no ECM and no fault-code history on this machine, so predictive care is entirely physical. Pull engine oil samples from the 6D14 and gear oil samples from the swing drive and travel final drives on a fixed schedule to catch metal wear before a failure. Watch fuel filter restriction and injection pump linkage smoothness for early signs of contamination or wear. Track hydraulic tank temperature and pump noise for early warning of internal wear, and check turbocharger shaft play and exhaust color at every service interval.

Corrective & Common Repairs

Common failure points on the E140 center on age and hour accumulation rather than electronics. Expect swing and travel final drive seal leaks, worn injection pump linkage causing hard starting or rough idle, and turbocharger bearing wear on high-hour engines. Boom, stick, and bucket pins and bushings wear from decades of cycling and need regular replacement. Undercarriage wear on the 500 mm (19.7 in) shoes, rollers, and idlers is a routine repair item, along with hydraulic cylinder rod seal replacement on the boom, stick, and bucket rams.

Overhaul & Rebuild Points

At major overhaul intervals, plan around the main hydraulic pump, swing motor, and travel motors, which wear internally after sustained heavy digging and need rebuild or exchange once flow or pressure drops off. The 6D14's top end (injectors, valves, turbocharger) is a common rebuild target on machines built decades ago, especially where smoke or oil consumption has increased. Full undercarriage replacement, including track chain, rollers, idlers, and sprockets, and swing bearing reseal or replacement round out the major rebuild list on higher-hour machines.

Seasonal & Environment Servicing

With no electronic block heater control or smart charging, cold-weather starting depends on glow-plug or ether-start aids and a battery kept at full charge; drain fuel tank water more often in freezing conditions to avoid gelling and filter icing. In dusty or abrasive sites, clean the radiator and oil cooler fins more frequently and inspect the air cleaner element on a shortened schedule. Adjust track tension for seasonal ground changes between soft mud and hard-packed or frozen ground to limit undercarriage wear.

E140 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Oil pressure warning lamp (with buzzer)	Engine lubrication oil pressure has dropped below the safe minimum	Low oil level, worn oil pump, clogged oil filter, or a faulty pressure switch/sender	Stop the engine immediately, check crankcase oil level and filter condition before restarting
Coolant temperature warning lamp	Engine coolant temperature has exceeded the normal operating range	Low coolant level, blocked radiator fins, failed fan belt, or a stuck thermostat	Reduce load and idle down, then check coolant level and radiator once safe to do so
Charging system (alternator) warning lamp	Charging circuit is not producing adequate voltage to the battery	Loose or broken alternator belt, worn brushes, or a wiring/connection fault	Check belt tension and battery terminal connections; test alternator output
Air filter restriction indicator	Intake air filter element is loading up and restricting airflow	Dust and dirt buildup in the filter element from normal jobsite operation	Service or replace the air filter element and reset the restriction indicator
Hydraulic oil temperature warning lamp	Hydraulic tank oil temperature is above normal working range	Low hydraulic oil level, clogged oil cooler fins, or sustained high-load operation	Idle down and let the system cool, then check oil level and clean the cooler fins

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

E140 attachments & work tools

Buckets

No factory bucket-capacity chart survives for the E140 itself, but at roughly 14 tonnes (30,800 lb / 13.97 t) operating weight it sits in the 12-16 t mid-size excavator class. General-duty buckets for this class run about 0.4-0.6 m3 (0.5-0.8 yd3) at 900 to 1200 mm (35 to 47 in) width; heavy-duty buckets trade width for wall thickness in the same 0.35-0.55 m3 range, with rock/severe-duty buckets narrower again. The E140 mounts buckets pin-on at the stick and link, matching the bucket-pin sizing used across 12-16 t class machines of its era.

Hydraulic hammers

For a machine in the 12-16 t class, the matching breaker class runs roughly 900 to 1600 kg service weight, varies by configuration and brand line. That class typically needs an auxiliary circuit flow near 80-110 L/min (21-29 gpm) at a working pressure of about 100-160 bar (1450-2320 psi), well below the E140's main-system relief setting, so a hammer must run off a dedicated reduced-pressure auxiliary line, not the main circuit.

Quick couplers

No factory quick-coupler fitment is documented for the E140; it is an older Cat-Mitsubishi joint-venture machine (built on the Mitsubishi 6D14-T-powered platform) predating widespread OEM coupler adoption. Aftermarket hydraulic pin-grabber (wedge or twin-lock jaw) couplers sized for the 12-16 t class fit the stick and bucket pin spacing used on machines this size and are the common retrofit; purely mechanical (manual pin) couplers were also common on machines of this vintage.

Thumbs/grapples

Hydraulic thumbs and grapples built for 12-16 t class sticks are usable if pin diameter and spacing match the E140's stick and bucket linkage. Because this machine predates common factory hydraulic-thumb kits, a bolt-on or clamp-style thumb bracket, or a separate hydraulic kit tied into an auxiliary line, is the typical route rather than an OEM plumbed thumb valve.

Rippers

Single-shank, stick-mounted rippers sized for the 12-16 t class are compatible for light rock scarifying or frozen-ground work, pinned in place of or alongside the bucket linkage. No E140-specific ripper kit is documented; sizing follows the same class-based pin match as buckets.

Hydraulic kit notes

The E140's main pump/relief circuit (roughly 264 L/min combined flow at about 264 bar relief) is sized for propel and digging functions, not for one-way tools. Any hammer, thumb, or other auxiliary tool needs its own plumbed kit with a flow control and relief valve set to the tool maker's spec (typically well under the machine's main relief pressure); this is aftermarket-fitted on a machine of this age rather than a factory-selectable option.

All E140 assemblies by section

Every catalogued assembly group for the Caterpillar E140. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine

Alternator

Alternator General

Automatic Timer

Breather And Oil Filter

Camshaft

Connecting Rod And Bearing-Part 2 Of 2

Connecting Rod And Bearing-Part 1 Of 2

Crankshaft And Pulley

Crankshaft Bearing

Cylinder Block-Part 1a Of 2

Cylinder Block-Part 1 Of 2

Cylinder Block-Part 2 Of 2

Cylinder Block Repair Kit

Cylinder Head

Cylinder Head Repair Kit

Engine Attaching Parts

Engine Gasket Kit-Part 2 Of 2

Engine Gasket Kit-Part 1 Of 2

Engine Hanger

Exhaust Manifold

Exhaust Muffler

Exhaust Pipe

Fan And Pulley

Flywheel

Flywheel Housing-Part 2 Of 2

Flywheel Housing-Part 1 Of 2

Fuel Feed Pump

Fuel Filter

Fuel Hose

Fuel Injection Nozzle

Fuel Injection Pipe

Fuel Injection Pump General

Fuel Return System

Governor-Part 1 Of 5

Governor-Part 5 Of 5

Governor-Part 4 Of 5

Governor-Part 3 Of 5

Governor-Part 2 Of 5

Injection Pump-Part 1 Of 2

Injection Pump- Part 2 Of 2

Inlet Manifold

Instrument (Safety Relay)

Liner And Piston Kit

Name Plate

Oil Cooler

Oil Filter

Oil Filter And Oil Level Gauge

Oil Line

Oil Pan

Oil Pump And Gear Train

Oil Strainer

Piston

Rocker Cover

Starter-Part 2 Of 2

Starter-Part 1 Of 2

Starter General

Timing Gear

Valve Gear Train-Part 1 Of 2

Valve Gear Train-Part 2 Of 2

Water Pipe And Thermostat

Water Pump

Water Temp Gauge Unit

Vehicle

Accumulator (1nf1-09022)

Accumulator (1nf09023-) Part 1 Of 2

Accumulator (1nf09023-)-Part 2 Of 2

Adjuster Cylinder

Air Cleaner

Air Conditioner-Part 3 Of 3

Air Conditioner-Part 2 Of 3

Air Conditioner-Part 1 Of 3

Air Conditioner Compressor

Air Conditioner Condenser And Receiver

Air Conditioner Harness

Air Conditioner Lines

Am/Fm Radio (1nf1-09011 Std ;1nf09012- O.P)

Arm And Accessories (For Breaker/Double Acting Actuators)-Part 2 Of 2

Arm And Accessories (For Breaker/Double Acting Actuators)-Part 1 Of 2

Arm And Bucket Lines-Part 1 Of 2

Arm And Bucket Lines-Part 2 Of 2

Arm Cylinder-Part 1 Of 2

Arm Cylinder (For Telescopic Arm)-Part 1 Of 2

Arm Cylinder (For Telescopic Arm)-Part 2 Of 2

Arm Cylinder-Part 2 Of 2

Auto Lock (1nf1-09020)

Bank Forming Bucket

Base Frame

Boom And Accessories-Part 1 Of 2

Boom And Accessories (For Breaker/Double Acting Actuators)-Part 1 Of 2

Boom And Accessories-Part 2 Of 2

Boom And Accessories (For Breaker/Double Acting Actuators)-Part 2 Of 2

Boom Cylinder-Part 1 Of 2

Boom Cylinder-Part 2 Of 2

Boom Light And Harness

Boom Lines

Bucket - Sae 7/8yd3 (Jis 0.65m3)

Bucket - Sae 3/4yd3 (Jis 0.5m3)

Bucket - Sae 3/8yd3 (Jis 0.26m3)

Bucket - Sae 3/4yd3 (Jis 0.55m3)

Bucket Cylinder-Part 2 Of 2

Bucket Cylinder-Part 1 Of 2

Bucket With Ejector - Sae 3/8yd3 (Jis 0.3m3)

Bucket With Ejector - Sae 3/8yd3 (Jis 0.31m3)

Bucket With Ripper - Sae 1/4yd3 (Jis 0.26m3)

Bucket With Ripper - Sae 1/4yd3 (Jis 0.2m3)

Cab (Interior Parts)-Part 4a Of 5

Cab (Door And Window Frame)-Part 2c Of 5

Cab (Frame)-Part 1c Of 5

Cab (Frame)-Part 1b Of 5

Cab (Frame)-Part 1a Of 5

Cab (Door And Window Frame)-Part 2 Of 5

Cab (Door And Window Frame)-Part 2b Of 5

Cab (Interior Parts)-Part 4 Of 5

Cab (Door And Window Frame)-Part 2a Of 5

Cab (Frame)-Part 1 Of 5

Cab (Glass And Corner Rubber)-Part 3 Of 5

Cab (Window Washer)-Part 5 Of 5

Cab Heater

Carrier Roller

Control Valve A-Part 4 Of 4

Control Valve A-Part 3 Of 4

Control Valve A-Part 1 Of 4

Control Valve A-Part 2 Of 4

Control Valve B-Part 4 Of 4

Control Valve B-Part 3 Of 4

Control Valve B-Part 1 Of 4

Control Valve B-Part 2 Of 4

Controls (For 2 Pumps-Double Acting Actuators)

Controls (For 1 Pump-Breaker/Double Acting Actuators)

Controls (For Telescopic Arm)

Cross Over Relief Valve-Part 1 Of 2

Cross Over Relief Valve-Part 2 Of 2

Delivery Lines

Drain Lines (For Swing Parking Brake)-Part 1 Of 2

Drain Lines-Part 2 Of 2

Drain Lines (For Swing Parking Brake)-Part 2 Of 2

Drain Lines-Part 1 Of 2

Electric Parts-Part 2 Of 2

Electric Parts-Part 1 Of 2

Electric Parts (For Cold Weather)

Engine-Part 2 Of 2

Engine-Part 1 Of 2

Engine-Part 2a Of 2

Engine Control

Engine Control (For Automatic Engine Speed Control)-Part 1 Of 3

Engine Control (For Automatic Engine Speed Control)-Part 3 Of 3

Engine Control (For Automatic Engine Speed Control)-Part 2 Of 3

Engine Hood-Part 1 Of 2

Engine Hood-Part 2 Of 2

Floor Mat (For Breaker/Double Acting Actuators)

Front Guard

Front Lines (For Breaker/Double Acting Actuators)

Front Lines

Front Lines (For Telescopic Arm)-Part 1 Of 2

Front Lines (For Telescopic Arm)-Part 2 Of 2

Front Lubrication Lines

Front Pilot Lines (For 2 Speed Breaker)

Fuel Tank And Fuel Lines-Part 2 Of 2

Fuel Tank And Fuel Lines-Part 1 Of 2

Gear Pump

Grab Bucket Cylinder-Part 2 Of 2

Grab Bucket Cylinder-Part 1 Of 2

Grapple-Part 1 Of 2

Grapple-Part 2 Of 2

Grease Bath

Head Guard

Head Rest

Hydraulic Tank (For Cold Weather)-Part 2 Of 2

Hydraulic Tank-Part 1 Of 2

Hydraulic Tank-Part 2 Of 2

Hydraulic Tank (For Cold Weather)-Part 1 Of 2

Idler Wheel

Link And Rod

Long Arm - 9' (2740mm)-Part 1 Of 2

Long Arm - 9' (2740mm)-Part 2 Of 2

Lower Structure Cover

Name Plate And Label (For Cold Weather)

Name Plate And Label (For Telescopic Arm)

Name Plate And Label (Body)

Name Plate And Label (For Automatic Engine Speed Control)

Name Plate And Label (Cab)

Name, Plate And Label (For Breaker)

Nipper-Part 1 Of 2

Nipper-Part 2 Of 2

Nipper Cylinder

Over Load Relief Valve (For Telescopic Arm)

P.T.O. Valve

P.T.O. Valve (For Telescopic Arm)-Part 1 Of 2

P.T.O. Valve (For Telescopic Arm)-Part 2 Of 2

Pilot Filter

Pump-Part 2 Of 11

Pump-Part 3 Of 11

Pump-Part 9 Of 11

Pump-Part 1 Of 11

Pump-Part 5 Of 11

Pump-Part 10 Of 11

Pump-Part 11 Of 11

Pump-Part 7 Of 11

Pump-Part 8 Of 11

Pump-Part 6 Of 11

Pump-Part 4 Of 11

Pump Drive

Pump Suction Lines

Radiator-Part 1 Of 3

Radiator-Part 3 Of 3

Radiator (For Air Conditioner)-Part 1 Of 2

Radiator (For Air Conditioner)-Part 2 Of 2

Radiator-Part 2 Of 3

Radiator Baffle Plate

Radio Mantle (1nf1-09011 O.P. ;1nf09012- Std)

Relay Box

Relay Box-Part 1 Of 2

Relay Box-Part 2 Of 2

Relief Valve

Relief Valve (For Breaker/Double Acting Actuators)

Remote Control Valve (For Automatic Engine Speed Control)-Part 1 Of 3

Remote Control Valve-Part 1 Of 2

Remote Control Valve (For Automatic Engine Speed Control)-Part 2 Of 3

Remote Control Valve-Part 2 Of 2

Remote Control Valve (For Telescopic Arm)-Part 1 Of 2

Remote Control Valve (For Telescopic Arm)-Part 2 Of 2

Remote Control Valve (For Automatic Engine Speed Control)-Part 3 Of 3

Return Lines-Part 2 Of 2

Return Lines-Part 1 Of 2

Ripper

Rotary Joint

Rotating Grab Bucket - Sae 5/8yd3 (Jis 0.5m3) (For Telescopic Arm)-Part 3 Of 3

Rotating Grab Bucket - Sae 1/2yd3 (Jis 0.4m3)-Part 2 Of 5

Rotating Grab Bucket - Sae 1/2yd3 (Jis 0.4m3)-Part 5 Of 5

Rotating Grab Bucket - Sae 1/2yd3 (Jis 0.4m3)-Part 3 Of 5

Rotating Grab Bucket - Sae 1/2yd3 (Jis 0.4m3)-Part 1 Of 5

Rotating Grab Bucket - Sae 5/8yd3 (Jis 0.5m3) (For Telescopic Arm)-Part 2 Of 3

Rotating Grab Bucket - Sae 5/8yd3 (Jis 0.5m3) (For Telescopic Arm)-Part 1 Of 3

Rotating Grab Bucket - Sae 1/2yd3 (Jis 0.4m3)-Part 4 Of 5

Seat And Floor Mat-Part 2 Of 3

Seat And Floor Mat-Part 3 Of 3

Seat And Floor Mat-Part 1 Of 3

Seat Belt

Servo And Pilot Lines-Part 3 Of 4 (1nf1-09022)

Servo And Pilot Lines Part 2 Of 4

Servo And Pilot Lines (For Automatic Engine Speed Control)-Part 2 Of 2

Servo And Pilot Lines (For Swing Parking Brake)-Part 2 Of 2

Servo And Pilot Lines (For Automatic Engine Speed Control)-Part 1 Of 2

Servo And Pilot Lines-Part 2 Of 2

Servo And Pilot Lines-Part 4 Of 4 (1nf09023-)

Servo And Pilot Lines (For Swing Parking Brake)-Part 1 Of 2

Servo And Pilot Lines-Part 1 Of 4

Servo And Pilot Lines (For Telescopic Arm)

Servo And Pilot Lines-Part 3a Of 4 (1nf1-09022) (Continued)

Servo And Pilot Lines-Part 1 Of 2

Short Arm - 7' (2130mm)-Part 2 Of 2

Short Arm - 7' (2130mm)-Part 1 Of 2

Shut Off Valve

Shuttle Valve (For Automatic Engine Speed Control)

Side Mirror

Slow Return Valve

Solenoid Valve (For Breaker)

Solenoid Valve

Solenoid Valve (For Telescopic Arm)

Solenoid Valve (For Swing Parking Brake)

Swing Brake (For Swing Parking Brake)-Part 1 Of 2

Swing Brake (For Swing Parking Brake)-Part 2 Of 2

Swing Drive (For Swing Parking Brake)

Swing Drive-Part 1 Of 2

Swing Drive-Part 2 Of 2

Swing Frame (For Breaker/Double Acting Actuators)

Swing Frame And Counter Weight-Part 2 Of 2

Swing Frame And Counter Weight (For Telescopic Arm)

Swing Frame And Counter Weight-Part 1 Of 2

Swing Frame Cover (Side) (For Breaker/Double Acting Actuators Telescopic Arm)-Part 1 Of 2

Swing Frame Cover (For Extreme Hot Weather)-Part 1 Of 2

Swing Frame Cover (For Vandalism Guard)

Swing Frame Cover (For Extreme Hot Weather)-Part 2 Of 2

Swing Frame Cover (Under) (For Extreme Hot Weather)

Swing Frame Cover (Side) (For Breaker/Double Acting Actuators Telescopic Arm)-Part 2 Of 2

Swing Frame Cover (Under) (For Breaker/Double Acting Actuators Telescopic Arm)

Swing Frame Cover (Side)-Part 1 Of 3

Swing Frame Cover (Side)-Part 2 Of 3

Swing Frame Cover (Side)-Part 3 Of 3

Swing Frame Cover (Support)

Swing Frame Cover (Under)

Swing Frame Cover (Upper)

Swing Gear-Part 2 Of 2

Swing Gear-Part 1 Of 2

Swing Lines

Swing Lines (For Swing Parking Brake)

Swing Motor-Part 1 Of 2

Swing Motor-Part 2 Of 2

Switch And Harness (For 2 Speed Breaker)

Switch Box-Part 4 Of 5

Switch Box (For Telescopic Arm)

Switch Box (Body)-Part 3 Of 3

Switch Box-Part 5 Of 5

Switch Box (Meter Unit)-Part 2 Of 3

Switch Box (For Automatic Engine Speed Control And Swing Parking Brake)

Switch Box-Part 1 Of 5

Switch Box-Part 3 Of 5

Switch Box (Panel)-Part 1 Of 3

Switch Box (Panel)-Part 1a Of 3

Switch Box (Body)-Part 3b Of 3

Switch Box (Body)-Part 3a Of 3

Switch Box-Part 2 Of 5

Telescopic Arm-Part 1 Of 2

Telescopic Arm- Part 2 Of 2

Telescopic Arm Lines-Part 2 Of 2

Telescopic Arm Lines-Part 1 Of 2

Tool And Battery Box

Track 19-5/8" (500mm) Flat Shoe

Track 19-5/8" (500mm) Triple Grouser Shoe

Track 23-5/8" (600mm) Triple Grouser Shoe

Track 27-1/2" (700mm) Triple Grouser Shoe

Track 30-3/8" (770mm) Triangle Shoe

Track 30-3/8" (770mm) Triple Grouser Shoe

Track 31-1/2" (800mm) Triangle Shoe

Track Roller

Trapezoidal Bucket - Sae 1/2yd3 (Jis 0.4m3)

Travel Drive-Part 4 Of 6

Travel Drive-Part 2 Of 6

Travel Drive-Part 6 Of 6

Travel Drive-Part 1 Of 6

Travel Drive-Part 3 Of 6

Travel Drive-Part 5 Of 6

Travel Drive And Sprocket

Travel Lines-Part 1 Of 2

Travel Lines-Part 2 Of 2

Travel Motor Lines-Part 2 Of 2

Travel Motor Lines-Part 1 Of 2

Traveling Control (For Automatic Engine Speed Control) (1nf1-09022)-Part 1 Of 2

Traveling Control (For Automatic Engine Speed Control) (1nf09023-)-Part 1 Of 3

Traveling Control (For Automatic Engine Speed Control) (1nf09023-)-Part 2 Of 3

Traveling Control-Part 1 Of 2

Traveling Control (For Automatic Engine Speed Control) (1nf09023-)-Part 3 Of 3

Traveling Control-Part 2 Of 2

Traveling Control (For Automatic Engine Speed Control) (1nf1-09022)-Part 2 Of 2

Upper Structure Lines (For Telescopic Arm)-Part 2 Of 3

Upper Structure Lines (For 2 Pumps Combined Flow-Double Acting Actuators)-Part 2 Of 2

Upper Structure Lines (For 2 Pumps Combined Flow-Double Acting Actuators)-Part 1 Of 2

Upper Structure Lines (For 1 Pump-Double Acting Actuators)

Upper Structure Lines (For Telescopic Arm)-Part 3 Of 3

Upper Structure Lines (For 1 Pump-Breaker)

Upper Structure Lines (For Telescopic Arm)-Part 1 Of 3

Vandalism Guard

Wiper Motor

Wiring Harness (For Cold Weather)-Part 2 Of 2

Wiring Harness-Part 1 Of 2

Wiring Harness (For Cold Weather)-Part 1 Of 2

Wiring Harness-Part 2 Of 2

Working Control-Part 2 Of 2

Working Control-Part 1 Of 2

Working Control (For Automatic Engine Speed Control)

Yoke And Tension

E140 serial number reference

The PIN/serial plate sits on the machine frame, commonly on the right-hand side near the cab base or on the upper frame rail behind the cab access point; on this era of Cat-Mitsubishi-built excavator it's also worth checking inside the cab door frame. The first 3 characters of the 8-character serial (or the matching block within a longer 17-character PIN) are the prefix tying the machine to its model and build plant; the remaining digits are the sequential unit number.

Prefix	Identifies	Notes
1NF	Base E140 hydraulic excavator, sole generation	Sole documented prefix for the E140, covering the full production run from 1NF00001. Powered by the Mitsubishi 6D14 diesel, inline-6, about 6.6 L (400 cu in), roughly 66 kW (88.5-88.6 hp) gross; the turbocharged 6D14-T designation seen on some spec sheets is unconfirmed for this model. Built during the Caterpillar-Mitsubishi joint-venture era at the Akashi, Japan excavator plant. No long-undercarriage or long-reach variant is confirmed under this prefix. A lettered E140B designation is not confirmed as a genuine distinct model; treat any reference to it with caution.

Frequently asked questions

What engine does the Caterpillar E140 use?

A Mitsubishi-built 6D14 turbocharged inline-6 diesel, 6.6 liters (400 cu in) displacement, rated near 66 kW (88.5 hp) gross. It runs a fully mechanical fuel injection system and mechanical governor with no electronic engine control.

What is the operating weight of the Caterpillar E140?

About 13,970 kg (30,800 lb) in standard configuration. Treat this as a 14-tonne class machine, since published figures vary slightly depending on source and attachment configuration.

What replaced the Caterpillar E140?

No factory document was found directly naming a successor. Caterpillar's Japan-built E-series moved to a lettered B-suffix update in the late 1980s (E110B, E120B, E140B, E200B, E240B) that likely followed the E140 in the lineup, but that link isn't confirmed by name. The E-series as a whole was eventually phased out in favor of later Caterpillar-engineered excavator platforms.

What E140 owners discuss

What engine does the E140 run, and is it a good one to own long-term?

The E140 runs a Mitsubishi 6D14 inline-six diesel, turbocharged in this excavator application and rated around 66 kW (88 hp) gross. It is fully mechanical: mechanical injection pump, no ECM, no electronic sensors to chase down. That simplicity is generally seen as a strength on an older, unsupported machine — fewer failure points and easier field diagnosis with basic tools. The trade-off is that engine and injection-pump service now runs through Mitsubishi industrial-diesel specialists more often than through a Cat counter, since this was a Cat-Mitsubishi joint-venture line.

The head gasket was replaced but the engine is still pushing air out the intake — what's going on?

This is a known complaint on Mitsubishi-engined excavators of this era, including 6D14-family machines: a blown head gasket gets replaced, and air keeps showing up in the intake anyway. That points past the gasket itself — a warped or cracked head, or a liner sealing surface that wasn't properly checked during the rebuild, is the usual cause. Retorquing a new gasket without verifying head flatness and cylinder liner protrusion first is the most common reason the leak comes right back within a short time. Have your dealer or an experienced diesel shop verify head flatness and liner height before final torque.

How do the hydraulic pumps on the E140 typically behave as they age?

The E140 shares its hydraulic pump architecture with the rest of the same-era Cat-Mitsubishi E-series line (E110B, E120, E180, E200B, E240), and rebuild shops commonly work with interchangeable pump internals across those models. As the pumps age, owners report the usual piston-pump symptoms: dig cycles go slow and spongy under load, digging power falls off with rising hours, and there is noise at cold start before the oil warms. Because the pump group shares a common oil supply, a pump that's run too long contaminates the rest of the circuit — dropping in a single rebuilt pump without flushing the system and changing filters is a frequent reason the fix doesn't hold.

Swing keeps rotating after I let go of the control, and one track is slower than the other. What should I check?

On this generation of Cat-Mitsubishi excavator, swing and travel are hydraulically actuated through mechanical linkage rather than pilot-electric controls. A house that keeps rotating after release, coasting down on friction instead of stopping cleanly, usually points to the swing brake or counterbalance valve rather than the swing motor itself. Uneven travel speed side to side, or a whine from one final drive, usually means a leaking face seal on that side letting the planetary run low on oil — caught early it is a seal job, ignored it takes the final drive with it. Because uncommanded swing motion is a safety issue, have your dealer verify the brake valve and swing relief before returning the machine to work.

What undercarriage wear pattern should I expect on a machine this size?

At around 14 tonnes (30,800 lb) operating weight, the E140's undercarriage wears the way any excavator crawler frame of this class and era does: rollers, idlers, and sprockets go first, and track sag left unchecked accelerates pin and bushing wear quickly. Ground pressure on the standard shoes is moderate for the class, so undercarriage life tracks ground conditions and tensioning discipline more than any particular factory weak point. The most consistently reported failure is a leaking final drive face seal — oil around the sprocket hub with dirt packed against the seal face — rather than anything specific to the E140 badge.

Are there common electrical or sensor faults on the E140?

Not in the way modern excavators have them. This machine predates onboard diagnostics, sensor networks, and an ECM, so electrical complaints are almost always basic charging and starting circuit faults, not sensor faults. Reported issues match any diesel of this vintage: a weak or failing battery, an alternator diode that back-feeds voltage and confuses the start circuit, and glow plug or ether-start hardware that's tired from age rather than use. If cold starts get progressively harder, check battery condition and the glow plug/ether circuit before chasing a fuel problem.

What should I check before buying a used E140?

The biggest practical issue reported with a used E140 is not wear, it's parts. This is a Cat-badged, Mitsubishi-built joint-venture machine from a long-discontinued line, and dealers frequently have nothing on the shelf and limited lookup support for it now. Before buying: confirm the hydraulic pumps and swing/travel motors actually work under load (a non-functioning pump is one of the more common reasons these turn up cheap), check final drives for seal leaks, and budget for sourcing parts through excavator-parts specialists and rebuilders rather than a Cat counter. Confirm the ID plate and engine data match the Mitsubishi 6D14, since parts and service information for this joint-venture line don't cross over cleanly with mainstream Cat-only excavators of similar size. Have your dealer or an independent tech verify hydraulic and final drive function during a pre-purchase inspection.

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

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