Caterpillarexcavator

Caterpillar E110

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar E110 is an 11-ton class crawler hydraulic excavator built roughly 1987-1993 under serial prefix 3FG, part of the original Caterpillar E-series line produced in Japan through the Shin Caterpillar Mitsubishi joint venture. It runs a Mitsubishi 4D31T turbocharged diesel with mechanical fuel injection and a mechanical governor -- no electronic engine management -- rated around 55 kW (74 hp) at the flywheel. It carries a variable-flow piston hydraulic system paired with mechanical pilot implement controls, standard for its generation. The E110 was among the first wave of E-series models rather than a follow-on to an earlier Cat-branded machine, and it was later succeeded by the E110B, which moved to a different engine depending on market.

Generational change in this class shows up mainly at the E110-to-E110B transition: the E110B kept the same size class but was offered with either a Caterpillar 3114 engine or a Mitsubishi S4K-T depending on where it was sold, splitting engine parts commonality from the base E110's 4D31T. The base E110's simple mechanical-injection powertrain and non-electronic hydraulics make it straightforward to keep running and rebuild without factory diagnostic tools, which is part of why surviving examples still see field use decades on. Because factory literature for this specific serial range is thin, these machines are valued in the used and parts market largely for solid chassis, undercarriage, and structural components, with buyers and rebuilders assessing individual machine condition rather than relying on published fleet data.

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 E110 specifications

Engine

E110 (base, 1987-1993) engine	Mitsubishi 4D31T turbocharged inline-4 diesel, mechanical fuel injection and mechanical governor — no electronic engine control. Tied to the base E110's own serial-number range (prefix 3FG).
E110 (base) power	Approximately 74 flywheel hp (55 kW)
E110B engine	Cat 3114, naturally aspirated inline-4 diesel
E110B displacement / cylinders	Approximately 4.4 L (268.6 cu in), 4 cylinders
E110B gross power	Approximately 79 hp (59 kW)
E110B net power	Approximately 79 hp (59 kW), same figure reported for gross and net
E110B engine note	An early E110B serial range (9HF1 and up) is documented in at least one operator's-manual listing with a Mitsubishi engine rather than the Cat 3114 — possible early-production overlap between the two engine sources; not resolved across all references
Emissions tier	Predates EPA and EU nonroad diesel emissions tiers (introduced mid-1990s) — no tier rating applies to this era of machine

Weights

E110 (base) operating weight	Approximately 10,705 kg (23,600 lb)
E110B operating weight	Approximately 11,600 kg (25,570-25,600 lb) — consistent across independent listings
E110B ground pressure	Approximately 39 kPa (5.7 psi, 0.4 kg/cm²)
Transport weight	Not separately documented — operating weight is the figure carried in available references

Dimensions

E110 (base) transport length	7.32 m (24 ft 0 in)
E110 (base) transport width	2.49 m (8 ft 2 in)
E110 (base) transport height	2.72 m (8 ft 11 in)
E110B transport length	7.24 m (23 ft 9 in)
E110B transport width	2.49 m (8 ft 2 in)
E110B transport height	2.69 m (8 ft 10 in)
E110B tail swing radius	Approximately 2.09 m (6 ft 10 in)
E110B track gauge	Approximately 1.99 m (6 ft 6 in)
E110B track shoe width	Standard shoe about 500 mm (19.7 in); a 690 mm (27.25 in) wide shoe is also referenced for one configuration
Ground clearance / undercarriage length	Not reliably documented — available figures are inconsistent between sources and are omitted here

Performance

Max digging depth	Approximately 4.75-5.9 m (15.6-19.4 ft), varies by stick length/configuration
Max reach along ground	Approximately 7.3-8.9 m (23.9-29.2 ft), varies by stick length/configuration
Max dump/loading height	Approximately 5.2-6.0 m (17-19.7 ft), varies by configuration
Max cutting height	Approximately 8 m (25 ft), reported for one stick configuration
Travel speed	Approximately 5 km/h (3.1 mph) single-range figure most commonly cited; one source instead gives a 3.5-4.5 km/h (2.2-2.8 mph) range — varies by source
Swing speed	Not documented in available sources for this model
Gradeability	Not documented in available sources for this model
Drawbar pull (E110B)	Approximately 8,770 kgf (19,334 lbf)

Forces

Bucket digging force	Not documented in available sources for this model
Arm/stick digging force	Not documented in available sources for this model

Service capacities (summary)

Fuel tank (E110B)	Approximately 250 L (66 gal)
Hydraulic system (E110B)	Approximately 160 L (42.3 gal); main pump flow about 214 L/min (56.6 gal/min); implement-circuit relief pressure about 29.4 MPa (4,270 psi)
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.

E110 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not documented for this serial range in available factory literature — verify against the OMM for your specific serial prefix	Cat Diesel Engine Oil (DEO) class, viscosity graded to ambient temperature per the standard Cat multigrade chart; machine runs a Mitsubishi 4D31-T diesel, so an API CD/CE-rated heavy-duty diesel oil in the OMM-specified grade is the safe substitute where Cat-branded oil is unavailable
Cooling system	Not documented for this serial range in available factory literature — verify against the OMM	Heavy-duty extended-life glycol-based coolant/antifreeze per Cat's standard cooling system specification; a 50/50 water-glycol premix is the common field practice for this engine class
Fuel tank	Not documented for this serial range in available factory literature — verify against the OMM	Diesel fuel per the engine's standard specification; no special additive named in available literature
Hydraulic system total / hydraulic tank	Not documented for this serial range in available factory literature — verify against the OMM. Field guidance for this generation of Cat excavator commonly cites an anti-wear (AW) type hydraulic oil, but no capacity figure is confirmed for E110 specifically	Cat anti-wear (AW) type hydraulic oil equivalent to ISO viscosity grade specified in the OMM for ambient temperature; multi-viscosity hydraulic oil substitutes are commonly used in the field for this excavator class
Final drive (each)	Not documented for this serial range in available factory literature — verify against the OMM	Cat Trans/Drive Train Oil (TDTO) or equivalent gear oil class typical of Cat final drives of this era; exact grade not confirmed for this model
Swing drive	Not documented for this serial range in available factory literature — verify against the OMM	Cat TDTO-class gear oil, consistent with swing drive lubrication practice on Cat excavators of this generation; exact grade not confirmed for this model
Pilot / other circuits	Not separately documented in available literature for this model	Not documented — not confirmed as a separate circuit from the main hydraulic system in available literature
Grease (spec only)	Not applicable (grease is a service-interval item, not a fill capacity)	General-purpose multipurpose grease (NLGI No. 2 lithium-complex class), consistent with standard Cat excavator pin and bushing lubrication practice; specific Cat grease product name not confirmed for this model

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

Caterpillar E110 maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil, coolant, and fuel level before start-up and top off as needed Walk-around inspection for fuel, oil, and hydraulic leaks around the engine bay and hose runs Drain water and sediment from the fuel/water separator Check track tension and inspect undercarriage for loose or damaged components Grease boom, stick, and bucket pivot pins and the swing circle weekly Check air cleaner restriction indicator and service if flagged
Every 250 h	Change engine oil and filter on the 4D31T Grease all pivot pins, bucket linkage, and swing bearing points Check and adjust track sag/tension Inspect fan belt condition and tension Check battery terminals, cable condition, and electrolyte level Clean or replace the primary fuel filter element
Every 500 h	Change hydraulic return and pilot filters Replace primary and secondary fuel filter elements Check final drive oil level in both travel motors Check swing drive oil level Inspect and adjust engine valve lash on the mechanical 4D31T if due Check coolant condition and corrosion inhibitor concentration
Every 1,000 h	Change final drive oil in both travel motors Change swing drive oil Sample hydraulic oil and inspect hydraulic tank breather Inspect turbocharger for shaft play, oil leakage, and boost hose condition Check injection pump timing and injector condition on the mechanical governor system Inspect track chain, sprockets, idlers, and rollers for wear
Every 2,000 h	Change hydraulic system oil Change coolant and flush the cooling system Inspect and service alternator and starter brushes Re-torque undercarriage and track fasteners Check swing bearing bolt torque and gear backlash Inspect boom, stick, and bucket pins/bushings for wear and replace as needed
Every 4,000 h	Inspect or overhaul the 4D31T long block: liners, pistons, and injection pump calibration Rebuild or replace the turbocharger cartridge Rebuild worn undercarriage: track chain, rollers, idlers, and sprockets Inspect and reseal the main hydraulic pump and swing/travel motors Inspect boom, stick, and mainframe welds for fatigue cracking

Servicing the E110 beyond the schedule

Predictive Maintenance & Fluid Analysis

With no ECM on the 4D31T, oil, fuel, and coolant sampling are the main early-warning tools on an E110. Pull engine oil samples at every filter change to track turbocharger wear and fuel dilution from the mechanical injection pump. Sample hydraulic oil for silica and metal fines from the variable-flow piston pump and swing/travel motors. Watch final drive and swing drive oil for water intrusion, common on machines this age with worn seals. Track coolant condition closely -- inhibitor depletion accelerates cylinder liner pitting in wet-liner Mitsubishi blocks.

Corrective & Common Repairs

Typical E110 repairs center on the mechanical fuel system: injector reconditioning, injection pump calibration, and governor linkage wear from decades of hand-throttle operation. Turbocharger shaft play and oil seal leaks are common on high-hour 4D31T units. On the hydraulic side, expect pilot control linkage wear -- this machine predates joystick electronics -- and main control valve spool scoring. Undercarriage wear, including track chain stretch and sprocket/idler wear, is the most frequent structural repair given the age of surviving machines and their thin factory parts support.

Overhaul & Rebuild Points

Major overhaul targets on a surviving E110 are the 4D31T long block (liners, pistons, injection pump), the turbocharger cartridge, and the undercarriage (chain, rollers, idlers, sprockets) -- most in-service machines today are well past a single life cycle on these components. Swing bearing bolt torque and gear backlash need inspection at rebuild intervals, since race wear is common on machines with heavy cycle counts. Budget main hydraulic pump and travel/swing motor seal kits alongside any undercarriage rebuild, since teardown labor overlaps.

Seasonal & Environment Servicing

Cold starts are the main seasonal risk on a mechanically-governed 4D31T with no electronic glow-plug management -- verify starting-aid function and battery condition before winter, and match fuel and coolant blend to ambient temperature. In hot, dusty environments, check turbocharger and radiator cores for packed debris more often and shorten air filter service intervals. Wet or corrosive job sites accelerate final drive and swing drive seal failure, so inspect housings for water intrusion after prolonged submersion or heavy washdown.

E110 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Oil pressure warning lamp	Engine oil pressure switch opens below the safe threshold, lighting an oil-can warning lamp on the instrument panel	Low oil level, worn oil pump, clogged oil filter, or a failed pressure switch	Shut engine down immediately, check oil level and filter condition before restarting
Coolant temperature warning lamp	Coolant temperature switch trips when the engine runs above normal operating range, lighting a thermometer-style lamp	Low coolant, blocked radiator or screen, slipping or failed fan drive, or a stuck thermostat	Idle down and let temperature drop, check coolant level and radiator/fan for debris before resuming work
Alternator/charge warning lamp	Battery-charging circuit lamp stays lit or flickers, indicating the alternator is not charging the batteries	Worn or slipping fan/alternator belt, failed alternator, or a loose/corroded wiring connection	Check belt tension and wiring at the alternator, test charging output, replace alternator if not charging
Air filter restriction indicator	A mechanical restriction gauge or dash lamp shows the intake air filter is loading up and choking airflow to the engine	Dirty or clogged primary air filter element, or a collapsed intake hose	Service or replace the air filter element and inspect intake ducting for damage
Glow plug / preheat indicator	Preheat lamp signals the intake air heater is cycling to warm the engine for cold starting	Normal cold-start cycle; a lamp that stays on or never lights can point to a failed heater relay or element	Allow the preheat cycle to complete before cranking; if the lamp behaves abnormally, check the preheat relay and wiring

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

E110 attachments & work tools

Buckets

This is a 1980s-era E-series carrier in the roughly 11-12 tonne class. A general-duty (GD) digging bucket around 900 mm (36 in) wide is documented on an actual E110 unit; wider buckets in the 1,000-1,200 mm (40-47 in) range show up on this same chassis size class but the exact factory GD/HD capacity split is not documented for this vintage machine. Mounting is pin-on; there is no factory quick-coupler fitment.

Hydraulic hammers

Carrier size puts this machine in the breaker class built for 7-13 tonne excavators, roughly a 300-500 kg hammer weight class. No E110-specific hammer pairing is published; match breaker weight and flow/pressure to the stick's lift and hydraulic capacity rather than assuming a single fixed model, and confirm with the attachment supplier before ordering.

Quick couplers

No quick coupler is documented as factory equipment on this E-series machine; buckets and other attachments mount pin-on at the stick and bucket linkage. Aftermarket pin-grabber or wedge-style couplers sized for 11-12 tonne carriers can be retrofitted, but pin diameter must be measured on the individual machine since it is not published for this model.

Thumbs/grapples

Bolt-on or hydraulic thumbs sized for an 11-12 tonne excavator fit at the same stick/bucket pin as the bucket. No factory thumb or grapple option is documented for this generation; these are aftermarket fitments sized to the machine's linkage geometry, not to a published factory spec.

Rippers

A single-shank ripper is listed among the attachment options for this model, mounted in place of the bucket at the stick linkage for scarifying light rock and frozen ground. Shank capacity and rated ripping force are not documented for this vintage machine; size selection should follow the carrier's stick/bucket digging force.

Hydraulic kit notes

No auxiliary high-flow or medium-pressure circuit is documented as factory-standard on this E-series machine. Powered attachments such as hammers or hydraulic thumbs require an aftermarket auxiliary hydraulic kit plumbed and set to the attachment's own flow and pressure requirements; verify circuit capacity before fitting a powered tool.

All E110 assemblies by section

Every catalogued assembly group for the Caterpillar E110. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Engine

Alternator

Alternator General

Breather And Oil Filler

Camshaft

Connecting Rod And Bearing

Coupling

Crankshaft And Pulley

Crankshaft Bearing

Cylinder Block (Part 2 Of 2)

Cylinder Block (Part 1 Of 2)

Cylinder Block Repair Kit

Cylinder Head

Cylinder Head Repair Kit

Engine Attaching Parts

Engine Gasket Kit-Part 1 Of 1

Engine Hanger

Engine Oilseal Kit

Exhaust Manifold

Exhaust Muffler

Exhaust Pipe

Fan And Pulley

Flywheel

Flywheel Housing

Fuel Feed Pump

Fuel Filter

Fuel Hose

Fuel Injection Nozzle

Fuel Injection Pipe

Fuel Injection Pump General

Fuel Return System

Governor - Part 4 Of 4

Governor Part 2 Of 4

Governor - Part 3 Of 4

Governor-Part 1 Of 4

Injection Pump - Part 2 Of 2

Injection Pump-Part 1 Of 2

Inlet Manifold

Instrument

Liner And Piston Kit

Name Plate

Oil Cooler-Part 2 Of 2

Oil Cooler Part 1 Of 2

Oil Filler And Oil Level Gauge

Oil Filter

Oil Line

Oil Pan

Oil Pressure Switch And Gauge Unit

Oil Pump And Gear Train

Oil Strainer

Piston - Part 1 Of 2

Piston - Part 2 Of 2

Rocker Cover

Starter - Part 2 Of 2

Starter Part 1 Of 2

Starter General

Timing Gear

Timing Gear Case

Turbo-Charger

Turbo-Charger General

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 (3fg1-00130)

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 (3fg1-00101 Std 3fg00102- O.P.)

Arm And Bucket Lines

Arm Cylinder - Part 2 Of 2

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

Arm Cylinder Part 1 Of 2

Arm Cylinder (For Telescopic Arm) Part 1 Of 2

Auto Lock (3fg1-00130)

Bank Forming Bucket

Base Frame

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 And Accessories Part 1 Of 2

Boom Cylinder - Part 2 Of 2

Boom Cylinder - Part 1 Of 2

Boom Light And Harness

Boom Lines

Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters)

Bucket - Sae 1/2 Cubic Yards (Jis 0.4 Cubic Meters)

Bucket - Sae 5/8 Cubic Yards (Jis 0.45 Cubic Meters)

Bucket - Sae 3/4 Cubic Yards (Jis 0.5 Cubic Meters)

Bucket - Sae 1/4 Cubic Yards (Jis 0.15 Cubic Meters)

Bucket Cylinder Part 1 Of 2

Bucket Cylinder - Part 2 Of 2

Bucket With Ejector - Sae 1/4 Cubic Yard (Jis 0.21 Cubic Meter)

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

Cab (Frame) Part 1b Of 5

Cab (Glass And Corner Rubber) Part 3 Of 5

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

Cab (Frame) Part 1c Of 5

Cab (Window Washer)-Part 5 Of 5

Cab (Interior Parts) - Part 4 Of 5

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

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

Cab (Frame) Part 1d Of 5

Cab (Frame) Part 1a Of 5

Cab (Frame) Part 1e Of 5

Cab (Interior Parts) - Part 4a Of 5

Cab (Frame) - Part 1 Of 5

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

Cab Floor (For Rotating Grapple)

Cab Heater

Carrier Roller

Control (For Breaker)

Control (For Double Acting Actuators)

Control (For 2 Pumps Combined Flow - Double Acting Actuators)

Control Valve A Part 1 Of 4

Control Valve A Part 3 Of 4

Control Valve A Part 2 Of 4

Control Valve A - 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

Control Valve B - Part 4 Of 4

Counter Balance Valve (3fg00102-)

Cross Over Relief Valve - Part 1 Of 2

Cross Over Relief Valve - Part 2 Of 2

Delivery Lines

Drain Lines - Part 2 Of 2

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

Drain Lines Part 1 Of 2

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

Electric Parts - Part 2 Of 2

Electric Parts Part 1 Of 2

Engine (Part 2a Of 2)

Engine (Part 2 Of 2)

Engine (Part 1 Of 2)

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

Engine Control

Engine Control (For Cold Weather)

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

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

Engine Hood - Part 2 Of 2

Engine Hood - Part 1 Of 2

Floor Mat (For Cold Weather)

Floor Mat (For Breaker/Double Acting Actuators)

Front Guard

Front Lines

Front Lines (For Telescopic Arm) Part 1 Of 2

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

Front Lines (For Swing Parking Brake)

Front Lines - Long And Medium Arm (For Breaker/Double Acting Actuators)

Front Lines - Short Arm (For Breaker/Double Acting Actuators)

Front Lubrication Lines

Front Pilot Lines (For Breaker)

Fuel Tank And Fuel Lines - Part 2 Of 2

Fuel Tank And Fuel Lines - Part 1 Of 2

Grab Bucket Cylinder - Part 1 Of 2

Grab Bucket Cylinder - Part 2 Of 2

Grapple 23a

Grapple 34b

Grapple Cylinder

Grease Bath

Head Guard

Head Rest

Hydraulic Tank - Part 2 Of 2

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

Hydraulic Tank - Part 1 Of 2

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

Idler Wheel

Link And Rod

Long Arm - 8'3" (2510mm)

Long Arm - 8'3" (2510mm) (For Breaker)

Lower Structure Cover

Medium Arm - 6'11" (2110mm) (For Breaker)

Medium Arm - 6'11" (2110mm)

Name Plate And Label (For Breaker)

Name Plate And Label (For Cold Weather)

Name Plate And Label (For Automatic Engine Speed Control)

Name Plate And Label (Body)

Name Plate And Label (For Telescopic Arm)

Name Plate And Label (Cab)

Nipper - 2 Of 2

Nipper Part 1 Of 2

Over Load Relief Valve (For Telescopic Arm)

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

P.T.O. Valve (For 2 Pumps Combined Flow - Double Acting Actuators)

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

Pilot Filter

Pump (For Cold Weather) - Part 5 Of 16

Pump Part 9 Of 13

Pump Part 4 Of 13

Pump - Part 12 Of 13

Pump (For Cold Weather) - Part 4 Of 16

Pump Part 10 Of 13

Pump Part 11 Of 13

Pump (For Cold Weather) - Part 3 Of 16

Pump (For Cold Weather) - Part 16 Of 16

Pump Part 5 Of 13

Pump Part 2 Of 13

Pump (For Cold Weather) Part 10 Of 16

Pump - Part 13 Of 13

Pump (For Cold Weather) Part 8 Of 16

Pump (For Cold Weather) Part 7 Of 16

Pump (For Cold Weather) Part 11 Of 16

Pump Part 6 Of 13

Pump (For Cold Weather) Part 12 Of 16

Pump (For Cold Weather) Part 15 Of 16

Pump Part 7 Of 13

Pump - Part 1 Of 13

Pump Part 8 Of 13

Pump Part 3 Of 13

Pump (For Cold Weather) Part 14 Of 16

Pump (For Cold Weather) - Part 2 Of 16

Pump (For Cold Weather) - Part 6 Of 16

Pump (For Cold Weather) - Part 1 Of 16

Pump (For Cold Weather) Part 9 Of 16

Pump (For Cold Weather) Part 13 Of 16

Pump Control (For Cold Weather)

Pump Drive

Pump Suction Lines

Pump Suction Lines (For Cold Weather)

Radiator Part 1 Of 2

Radiator - Part 2 Of 2

Radiator (For Air Conditioner) - Part 2 Of 2

Radiator (For Air Conditioner) Part 1 Of 2

Radiator Baffle Plate

Radio Mantle (3fg1-00101 O.P. 3fg00102- Std)

Relay Box

Relay Box (For Automatic Engine Speed Control (A.E.C.) And Swing Parking Brake (S.P.B.) - Part 2 Of 2

Relay Box (For Automatic Engine Speed Control (A.E.C.) And Swing Parking Brake (S.P.B.) - Part 1 Of 2

Relief Valve

Relief Valve (For Breaker/Double Acting Actuators)

Remote Control Valve - Part 2 Of 2

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

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

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

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

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

Remote Control Valve Part 1 Of 2

Return Lines Part 1 Of 2

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

Return Lines - Part 2 Of 2

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

Ripper

Rotary Joint

Rotary Joint (For Rotating Grapple)

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) (For Telescopic Arm) - Part 2 Of 2

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) - Part 4 Of Of 4

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) - Part 3 Of 4

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) (For Telescopic Arm) - Part 1 Of 2

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) Part 1 Of 4

Rotating Grab Bucket - Sae 3/8 Cubic Yards (Jis 0.3 Cubic Meters) Part 2 Of 4

Rotating Grapple (Part 1d Of 2)

Rotating Grapple (Part 1 Of 2)

Rotating Grapple (Part 1a Of 2)

Rotating Grapple (Part 2 Of 2)

Seat And Floor Mat-Part 3 Of 3

Seat And Floor Mat - Part 1 Of 3

Seat And Floor Mat-Part 2 Of 3

Seat Belt

Servo And Pilot Lines Part 2 Of 3

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

Servo And Pilot Lines (For Automatic Engine Speed Control

Servo And Pilot Lines Part 1 Of 3

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

Servo And Pilot Lines Part 2a Of 3

Servo And Pilot Lines Part 3b Of 3

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

Servo And Pilot Lines Part 3 Of 3

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

Servo And Pilot Lines Part 3a Of 3

Short Arm - 5'10-7/8" (1800mm)

Short Arm - 5'10-7/8" (1800mm) (For Breaker)

Shut Off Valve

Shuttle Valve (For Automatic Engine Speed Control)

Side Mirror

Slow Return Valve

Solenoid Valve

Solenoid Valve (For Breaker)

Solenoid Valve (For Swing Parking Brake)

Solenoid Valve (For Telescopic Arm)

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

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

Swing Brake Valve (For Rotating Grapple) Part 1 Of 2

Swing Brake Valve (For Rotating Grapple) - Part 2 Of 2

Swing Drive - Part 2 Of 2

Swing Drive - Part 1 Of 2

Swing Drive (For Swing Parking Brake)

Swing Frame (For Breaker/Double Acting Actuators)

Swing Frame And Counter Weight - Part 1 Of 2

Swing Frame And Counter Weight (For Telescopic Arm)

Swing Frame And Counter Weight - Part 2 Of 2

Swing Frame Cover (For Breaker/Double Acting Actuators) Part 1 Of 2

Swing Frame Cover (Side) - Part 1 Of 2

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

Swing Frame Cover (For Vandalism Guard)

Swing Frame Cover (Upper)

Swing Frame Cover (Side) - Part 2 Of 2

Swing Frame Cover (Under)

Swing Frame Cover (Support)

Swing Gear Part 1 Of 2

Swing Gear (For Rotating Grapple) - Part 2 Of 2

Swing Gear - Part 2 Of 2

Swing Gear (For Rotating Grapple) Part 1 Of 2

Swing Lines (For Swing Parking Brake)

Swing Lines

Swing Motor Part 1 Of 2

Swing Motor - Part 2 Of 2

Swing Motor (For Rotating Grapple)

Switch And Harness (For Breaker)

Switch Box (For Telescopic Arm)

Switch Box (For Automatic Engine Speed Control (A.E.C.)

Switch Box (Meter Unit) Part 2 Of 3

Switch Box (Body) - Part 3b Of 3

Switch Box (For Automatic Engine Speed Control (A.E.C.) And Swing Parking Brake (S.P.B.) - Part 5 Of 6

Switch Box (Panel) Part 1a Of 3

Switch Box (Body) Part 3a Of 3

Switch Box (For Automatic Engine Speed Control (A.E.C.) And Swing Parking Brake (S.P.B.) - Part 4 Of 6

Switch Box (Panel) Part 1 Of 3

Switch Box (For Automatic Engine Speed Control (A.E.C.) And Swing Parking Brake (S.P.B.) - Part 6 Of 6

Switch Box (Body) - Part 3 Of 3

Telescopic Arm Part 2 Of 2

Telescopic Arm - Part 1 Of 2

Telescopic Lines Part 1 Of 2

Telescopic Lines - Part 2 Of 2

Tool And Battery Box

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

Track 27-1/2" (700mm) Triple Grouser Shoes - Part 2 Of 2

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

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

Track 27-1/2" (700mm) Triple Grouser Shoes Part 1 Of 2

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

Track Roller

Trapezoidal Bucket - Sae 1/2 Cubic Yard (Jis 0.3 Cubic Meter)

Trapezoidal Bucket - Sae 5/8 Cubic Yard (Jis 0.4 Cubic Meter)

Travel Drive (3fg1-00101) Part 3 Of 4

Travel Drive (3fg1-00101) - Part 4 Of 4

Travel Drive (3fg1-00101) Part 2 Of 4

Travel Drive (3fg1-00101) Part 1 Of 4

Travel Drive And Sprocket (3fg1-00101)

Travel Drive And Sprocket (3fg00102-)

Travel Gear (3fg00102-) Part 1 Of 3

Travel Gear (3fg00102-) - Part 3 Of 3

Travel Gear (3fg00102-) Part 2 Of 3

Travel Lines

Travel Motor Part 3 Of 3

Travel Motor (3fg00102-) Part 1 Of 3

Travel Motor (3fg00102-) Part 2 Of 3

Travel Motor Lines (3fg1-00101)

Travel Motor Lines (3fg00102-)

Traveling Control (For Automatic Engine Speed Control) (3fg00131-) - Part 3 Of 3

Traveling Control - Part 2 Of 2

Traveling Control (For Automatic Engine Speed Control) (3fg1-00130)-Part 2 Of 2

Traveling Control (For Automatic Engine Speed Control) (3fg00131-) Part 2 Of 3

Traveling Control - Part 1 Of 2

Traveling Control (For Automatic Engine Speed Control) (3fg00131-) Part 1 Of 3

Traveling Control (For Automatic Engine Speed Control) (3fg1-00130) - Part 1 Of 2

Upper Structure Lines (For Breaker)

Upper Structure Lines (For Double Acting Actuators)

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

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

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

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

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

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

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

Vandalism Guard

Wiper Motor

Wiring Harness - Part 1 Of 2

Wiring Harness - Part 2 Of 2

Working Control - Part 2 Of 2

Working Control (For Telescopic Arm)

Working Control (For Automatic Engine Speed Control)

Working Control Part 1 Of 2

Yoke And Tension

E110 serial number reference

On the E110/E110B the PIN plate is riveted to the machine frame, typically on the right-hand side of the upper structure near the operator cab or on the frame rail below the cab window. Read the first three characters as the serial-number prefix (identifies the specific build range/engine arrangement within the model), followed by a five-digit sequence number unique to that machine.

Prefix	Identifies	Notes
3FG	E110 (base/first generation) hydraulic excavator	Machine range 3FG00001-UP. Fitted with the Mitsubishi 4D31-T engine. This is the original E110, predecessor to the E110B. Build era late 1980s.
9HF	E110B track-type excavator, Mitsubishi-engine build	Machine range 9HF00001-UP. Fitted with the Mitsubishi S4K-T engine. This engine pairing is associated with export-spec E110B units built outside the Cat-engine US-market line. Confirm exact build year with dealer.
5GK	E110B track-type excavator, Cat-engine build	Machine range 5GK00001-UP. Fitted with the Cat 3114 engine, the domestic/US-market powerplant option for the E110B. Confirm exact build year with dealer.
8MF	E110B Low Ground Pressure (LGP) supplement / long-undercarriage variant	Machine range 8MF00001-UP. Low-ground-pressure supplement to the base E110B track-type excavator with wider/longer undercarriage. Cat 3114T engine reported for this configuration - confirm engine pairing with dealer.
4FJ	E110B track-type excavator	Machine range 4FJ00001-UP, a distinct E110B production range alongside 5GK and 8MF. Engine fitment not confirmed from available sources - confirm with dealer.

Frequently asked questions

What engine does the Caterpillar E110 use?

The Caterpillar E110 is powered by a Mitsubishi 4D31T turbocharged diesel with mechanical fuel injection and a mechanical governor -- there is no electronic engine control. Output is rated around 55 kW (74 hp) at the flywheel. This is distinct from the later E110B, which used either a Caterpillar 3114 or a Mitsubishi S4K-T depending on market.

What is the operating weight of the Caterpillar E110?

Operating weight for the E110 class falls roughly in the 10.5 to 12 metric ton (23,000-26,500 lb) range, varying by configuration such as track shoe width and counterweight fit. Treat this as a range rather than a fixed figure -- factory literature for this specific serial range is thin, so verify against your machine's data plate.

What replaced the Caterpillar E110?

The Caterpillar E110 was succeeded by the E110B, built in the same size class but offered with a different engine depending on market -- either a Caterpillar 3114 or a Mitsubishi S4K-T. The two are separate machines with different powertrains; parts and specs should not be assumed interchangeable between them.

What E110 owners discuss

What engine does the E110 actually run, and is it different from later E-series machines?

The original E110 (built roughly 1987-1993, serial prefix 3FG) runs a Mitsubishi 4D31T: a turbocharged 3.3 L (3298 cc) inline-4 with mechanical, jerk-pump fuel injection - no ECM, no electronic governor. Bore and stroke are 100 mm x 105 mm (3.94 in x 4.13 in), rated around 55 kW (74 hp) at the flywheel. This is a purely mechanical diesel, so it tends to be tolerant of neglect and simple to keep alive compared to later electronically-injected machines, but injection timing and pump work need a shop that actually knows Mitsubishi industrial diesels, not just a generic dealer tech. Note the later E110B moved to a different Mitsubishi block (S4K family) - don't assume parts or specs cross over between the base E110 and the E110B without checking the tag on the engine in front of you.

Cat badge, Mitsubishi engine - how do owners feel about parts support and reliability?

Cat sourced this whole light-to-mid excavator line from Mitsubishi in Japan, and the E110 shares core engine parts (oil pump, fuel feed pump, starter) with its E70/E70B stablemates on the same 4D3x engine family. Opinions split: some long-time Cat owners are flatly distrustful of the Mitsubishi drivetrain and want it swapped or sold; others point out these engines are simple, low-stressed, and reliable if serviced properly, and that Mitsubishi's Cat-badged machines have a long track record. Practically, expect to source engine parts through Mitsubishi industrial-diesel channels as much as through Cat, and expect the local Cat dealer's familiarity with this specific driveline to be thinner than it is for a native Cat-engine machine.

Owner reported 24V at the battery but no power at the dash and no start from the cab - what's actually going on?

This is a documented case on a base E110: full 24V at the battery, nothing at the dashboard, can't crank from inside the cab, but jumping the starter directly gets the engine running. That pattern points at the battery circuit breaker or the wiring/connection between the battery bus bar and the fuse panel, not the starter itself - a worn ignition switch was tried on a similar machine and did not fix it. On a machine this age there's no sensor network to chase; nearly everything called an electrical issue on these is basic charging/starting-circuit wear - corroded grounds, a tired breaker, brittle harness insulation. Have your dealer or an auto-electrician verify the wiring and breaker before replacing the starter.

What's the hydraulic system like, and are there known weak points?

The E110 shipped with a variable-flow hydraulic system and mechanical (lever) implement controls rather than electro-hydraulic joysticks, so there's little to go wrong electronically on the control side. Most hands-on hydraulic complaints circulating for this general Cat/Mitsubishi excavator platform - front-bearing wear in the main pump, and a swing brake that either won't release or won't hold - are written up on the later-generation E110B, which shares the same broad architecture but is not confirmed identical in every part. Treat that as a guide, not a guarantee, for a base E110. Before buying or after a repair, cycle every function including the swing brake release and watch pump case-drain flow and hose condition - have your dealer verify swing brake operation, since a brake that won't hold is a safety issue, not just an inconvenience.

What undercarriage or final-drive wear pattern should I expect on a machine like this?

Final drives of this era and class use a face-seal arrangement between the hydraulic motor and the drive sprocket to keep planetary gear oil separated from the motor housing. The common failure path: packed dirt and debris around the final drive pushes the face seal out of alignment, the sealing faces get scored, and gear oil starts leaking past the seal. Keeping the undercarriage clean is the single biggest thing an owner can do to prevent it. Also inspect sprockets for cracking or bending, and check track tension regularly - tensioners and seals on machines this old are a routine wear item, not a sign of abuse.

What should I check before buying a used E110?

Confirm identity first: verify the serial/data plate actually matches an E110 (prefix 3FG on the original run) rather than a similar-looking E110B or a rebadged unit - model numbers on this generation of Cat/Mitsubishi machines have been reused across distinct chassis generations, so don't assume the sale listing is accurate. Walk the frame for cracks, bad welds, rust-through, or warping. Budget for the undercarriage - it typically represents about half the machine's total ownership cost, so inspect track, rollers, idlers, and sprockets closely rather than treating them as an afterthought. Start it cold, run it long enough to reach temperature, and cycle every hydraulic function including swing and the swing brake release. Watch and smell for fuel or hydraulic leaks while it's running - a fuel smell or visible weeping under load points to a real problem, not cosmetic wear. Given the mechanical fuel system and age of these machines, have your dealer or a diesel shop verify injection pump condition and compression before you commit.

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

Need a specific E110 part?

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

Search parts in the app