Komatsutrucksmechanical

Komatsu BFA40-3(210M BFA40-CA thru CZ)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu BFA40-3 (210M) is a rigid frame mining haul truck produced for serial numbers BFA40-CA through BFA40-CZ. It belongs to the 40-ton class of haul trucks and utilizes the KT-19/1150 series engine. The machine features a rigid chassis design with a suspension system and wet disc brakes. Configurations offered include standard body and high-capacity body options. The BFA40-3 succeeded the BFA40-2 (BFA40-AS through BZ) and was followed by the BFA40-4 (BFA40-DA through DN).

The BFA40-3 generation marked a transition in the 210M series, utilizing the KT-19/1150 engine before the industry-wide shift to the QSK-19 engine in the BFA40-4 and subsequent models. This specific serial range is significant in the used and parts market because it represents the final iteration of the KT-19 platform for this chassis. Parts for the BFA40-3 are distinct from the earlier BFA40-2 and later BFA40-4/5/6 models due to engine and emission system differences. The machine remains relevant for fleet continuity in mining operations requiring 40-ton capacity with proven mechanical reliability.

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.

Komatsu BFA40-3(210M BFA40-CA thru CZ) specifications

Engine

ModelKT-19/1150 Series
Emissions TierNot documented for this exact serial range — verify with your dealer

Weights

Operating WeightNot documented for this exact serial range — verify with your dealer
Shipping WeightNot documented for this exact serial range — verify with your dealer
Ground PressureNot documented for this exact serial range — verify with your dealer

Dimensions

Transport LengthNot documented for this exact serial range — verify with your dealer
Transport WidthNot documented for this exact serial range — verify with your dealer
Transport HeightNot documented for this exact serial range — verify with your dealer
Wheelbase / Track GaugeNot documented for this exact serial range — verify with your dealer
Ground ClearanceNot documented for this exact serial range — verify with your dealer

Performance

Travel SpeedsNot documented for this exact serial range — verify with your dealer
GradeabilityNot documented for this exact serial range — verify with your dealer

Service capacities (summary)

Fuel TankNot documented for this exact serial range — verify with your dealer
Hydraulic SystemNot documented for this exact serial range — verify with your dealer
Engine OilNot documented for this exact serial range — verify with your dealer
Cooling SystemNot documented for this exact serial range — verify with your dealer

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

Komatsu BFA40-3(210M BFA40-CA thru CZ) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level at sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check DEF level.
  • Check air filter restriction indicator.
Every 250 h
  • Change engine oil and filter.
  • Grease all body pivot, suspension, and steering points.
  • Check hydraulic return filter condition.
  • Inspect belts, hoses, and clamps.
  • Check final drive oil level.
  • Visual inspection of undercarriage wear.
Every 500 h
  • Replace fuel filter and drain water separator.
  • Replace hydraulic return filter.
  • Test battery and alternator load.
  • Test coolant SCA concentration.
  • Collect KOWA hydraulic oil sample.
  • Inspect hydraulic hoses for cracks and leaks.
Every 1,000 h
  • Change hydraulic oil.
  • Change final drive oil on both sides.
  • Clean or replace engine air filter outer element.
  • Inspect turbocharger condition.
  • Measure undercarriage wear components.
  • Check structural welds for fatigue.
Every 2,000 h
  • Flush and replace coolant.
  • Change transmission oil and filter.
  • Change differential and axle oil.
  • Torque ROPS and FOPS bolts.
  • Inspect brake pads and wet disc condition.
  • Check tire inflation and torque wheel nuts.

Servicing the BFA40-3(210M BFA40-CA thru CZ) beyond the schedule

Predictive Maintenance & Fluid Analysis

Implement KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent cavitation in the KT-19/1150 engine block. Monitor hydraulic oil particle count to detect pump or valve wear in the steering and lift circuits. Track fuel dilution and soot levels in engine oil to adjust change intervals if operating in high-dust conditions. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates.

Corrective & Common Repairs

Address frequent hydraulic return filter clogging by inspecting suction strainers and checking for seal damage. Replace worn steering cylinder seals to prevent pressure loss and slow response times. Inspect wet disc brake pads for uneven wear and replace as sets to maintain stopping power. Check final drive oil for gear tooth wear particles indicating planetary gear failure. Tighten loose body pivot pins to reduce chassis stress and noise. Replace cracked hydraulic hoses before they fail under high-pressure cycles.

Overhaul & Rebuild Points

Plan engine overhaul around 10,000 to 15,000 hours for the KT-19/1150, focusing on piston rings and valve seats. Rebuild final drives when oil analysis shows high iron or copper content or when gear noise increases. Inspect the transmission clutch packs at 10,000 hours for slippage and replace friction discs if wear limits are reached. Check the suspension cylinders for seal leakage and rod scoring, replacing seals or cylinders as needed. Evaluate the undercarriage rollers and idlers for excessive play or track alignment issues.

Seasonal & Environment Servicing

In cold climates, use low-temperature hydraulic oil and ensure coolant glycol concentration is adequate to prevent freezing. Install engine block heaters and battery blankets for operation below -20°C. In hot environments, clean radiator and oil cooler fins daily to prevent overheating of the KT-19/1150 engine. Use high-temperature grease for suspension and steering points in dusty conditions. Check air filter restriction indicators more frequently in high-dust mining sites to prevent engine intake contamination.

BFA40-3(210M BFA40-CA thru CZ) common service parts

Part numberPart
DA1467Element, Fuel FilterCheck fitment →
BF1246Filter, Air HornCheck fitment →
PB1257Filter, Air Conditioning / HeatingCheck fitment →
VS7035Element, Engine Oil Filter (By-Pass)Check fitment →
VE5096Mount, FilterCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

BFA40-3(210M BFA40-CA thru CZ) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify voltage at the pin connector
CA441Battery voltage too lowAlternator failure, battery degradation, or voltage regulator faultReplace the alternator or battery and check the voltage regulator
CA442Battery voltage too highAlternator overcharging or voltage regulator malfunctionReplace the alternator or battery and check the voltage regulator
CA111Internal engine controller faultECM hardware failure or internal circuit malfunctionReplace or reprogram the ECM
CA122Intake air pressure high voltageIntake pressure sensor malfunction or wiring shortVerify the intake pressure sensor and wiring
CA123Intake air pressure low voltageSensor short or airflow restrictionCheck for a sensor short or an airflow restriction
CA451Common rail pressure sensor feedback value too highFuel rail sensor malfunction or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA452Common rail pressure sensor feedback value too lowFuel rail sensor malfunction or low pressure conditionDiagnose the fuel rail pressure sensor or pump lines
CA234Engine overspeedThrottle calibration error, engine load cycle issue, or operator misuseVerify throttle calibration, engine load cycle, or operator misuse
CA689Engine speed sensor errorSensor failure or signal phase abnormalityReplace the corresponding sensor or inspect the sensor gap

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

BFA40-3(210M BFA40-CA thru CZ) attachments & work tools

Dump Body Configurations

The BFA40-3 (210M BFA40-CA thru CZ) is a rigid dump truck equipped with a standard dump body. Factory specifications for this serial range do not list interchangeable work-tool families such as quick-attach buckets or specialized mining bodies; the body is a fixed structural component of the truck chassis.

Coupler / Mounting Systems

No external quick-coupler or mounting system is documented for the BFA40-3 dump body. The body is bolted to the truck frame, and attachment points are limited to the standard lift cylinders and tilt mechanisms integrated into the truck's hydraulic system.

Hydraulic Kit / Arrangement Notes

The BFA40-3 (210M BFA40-CA thru CZ) utilizes a KT-19/1150 Series Engine. The dump body operation relies on the truck's internal hydraulic circuit for lift and tilt; no external auxiliary hydraulic kits for work tools are specified for this model in the available service manuals.

Notable Factory Configurations / Guarding

Factory configurations for the BFA40-3 include standard guarding for the dump body and chassis. Specific options such as side skirts, rear guards, or specialized wear plates are not detailed in the provided operation and maintenance manuals for this serial range.

All BFA40-3(210M BFA40-CA thru CZ) assemblies by section

Every catalogued assembly group for the Komatsu BFA40-3(210M BFA40-CA thru CZ). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Body Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Body Group : Body & Pivot Installation
AK***18Note: (1) Included In Ak7318 Body Pin Kit, One Side Only0
C***3Pin, Cotter2
C***4Lockwasher - 1" (1)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Body Group : Mud Flap Installation
TZ***33Mud Flap1
TR***36Flatwasher - 3/8" (Qty 5 (4))84
TY***14Strip4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Body Group : Rock Deflector - Fender Instl
C***3Nut - 1/2" - 13nc (G5)8
C***0Capscrew - 1/2" - 13nc X 5 1/2"5
C***6Capscrew - 1/2" - 13 X 4-1/2" G53
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Cab Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Air Conditioner & Piping
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)3
C***5Capscrew - 3/8" - 16nc X 1 3/4" (L.H. Side)4
C***7Capscrew - 1/2" - 13nc X 2-1/4"4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Assembly W/Rops (Ed8321)
BF***03Window Assembly1
BF***08Door, Assembly - L.H1
BF***47Clamp, Hose1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Assembly W/Rops - 2 (Ed8321)
BF***48Handle, Grab (Inside, R.H.)1
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)3
C***0Nut, Hex (Grab Handle)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Door Assembly - 1
BF***03Window Assembly1
BF***00Cover, Access1
BF***07Handle Assembly1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Miscellaneous - 1
BF***52Harness, Joystick1
PB***70Heater & Air Conditioner Assembly (See Index)1
PB***14Driver Seat Assembly (See Index)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Miscellaneous - 2
BF***51Relay Box Assembly (See Index)1
DF***17Nut - #10 - 24nc (Brass)2
PB***24Monitor, Battery1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Support Installation
C***1Lockwasher - 5/8" (3)/(4)3
C***2Capscrew - 5/8" - 11nc X 1 1/2"3
TY***43Bushing3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Cab Wiring Module
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Heater & Air Conditioner Assm (Pb6370)
VJ***19Cover, Air Intake1
VE***43Blower Assembly - R.H1
VE***44Motor - 24v1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Heater Piping
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)5
C***7Flat Washer - 3/8" (Attaches With #31 Undercab)5
EB***14Hose, Heater1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Instrument Panel
DF***17Nut - #10 - 24nc (Brass)4
HE***67Machine Screw - #6 - 32nc X 1/2" (2)8
PB***06Gauge Cluster (See Instrument Panel Page, Item 26)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Latch Assembly
BF***01Rod1
BF***02Rod1
VJ***84Ring, Retaining1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Mirror Installation - L.H.
H***6Capscrew - 1/4" - 20nc X 1/2"6
R***2Lockwasher - 1/4" (External Tooth)6
TY***39Gasket, Bracket, Mounting2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Receiver Drier Assembly (Pb6475)
VE***66Switch, Pressure1
VE***65Receiver Dryer1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Seat Assembly - 1 (Pb4414)
C***3Capscrew - 1/2" - 13nc X 11 1/4" (2)2
DD***40Flat Washer - 1/2" (2)2
DF***42Flatwasher, Plain - 3/4"2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Seat Assembly - 2 (Pb4414)
DF***42Flatwasher, Plain - 3/4"4
RK***34Note: (1) Serviced As Part Of Bearing Kit Rk02340
RK***35(2) Serviced As Part Of Hardware Kit Rk02350
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cab Group : Seat Assembly - 3 (Pb4414)
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
RK***34Note: (1) Serviced As Part Of Bearing Kit Rk02340
RK***35(2) Serviced As Part Of Hardware Kit Rk02350
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Cooling System
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cooling System : Fan Guard Installation
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)11
C***3Capscrew - 3/8" - 16nc X 1-1/4" G5 (1)11
PB***51Guard, Fan1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cooling System : Radiator Air Baffle Instl
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)12
C***3Capscrew - 3/8" - 16nc X 1-1/4" G5 (1)8
TX***64Weatherstrip2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cooling System : Radiator Assembly - 1 (Pb7024)
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"18
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)18
C***0Nut, Hex (Grab Handle)116
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cooling System : Radiator Piping - 1
BF***77Capscrew, Socket Head20
BF***82Body1
BF***74Head, Inlet2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Cooling System : Radiator Piping - 2
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
C***1Plug, Pipe (3) (Qty.1 (4))1
C***3Nut - 1/2" - 13nc (G5)4
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Electrical System
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Engine Wiring Installation
12***C1Cap, Insulator1
67***93Switch, Engine Oil Pressure Sending1
C***0Nut - 1/4" - 20nc (1) - Qty 100 (2)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Light Assembly (Flood) (Ak7503)
AK***34Lens/Reflector - Backup - Clear (Without Bulb) (5)1
AK***50Insulator (2)1
AK***52Housing Assembly, Universal (3)/(4)/(5)/(6)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Light Assembly (Tail) (Ak7508)
AK***38Lens/Reflector - Stop/Tail - Red (Without Bulb) (2)1
AK***50Insulator (2)1
AK***52Housing Assembly, Universal (3)/(4)/(5)/(6)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Wiring Installation - 1
08***20Horn (Low)1
08***30Horn (High)1
AK***30Bulb - Light - 24v/60w (1)/(2)/(3)/(4)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Wiring Installation - 2
73***C2Alarm, Reversing1
AK***03(3) Included In Ak7503 Flood (Back-Up) Light Assm2
AK***08Stop/Tail Light Assembly (Led) (See Fig 60111)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Electrical System : Wiring Installation - 3
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"2
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)2
C***7Flat Washer - 3/8" (Attaches With #31 Undercab)2
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Engine & Transmission Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Accelerator Control (Pb5959)
VE***43Clevis Term. Kit1
VE***44Bellows1
VE***36Bearing Kit1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Air Cleaner Assembly (Pb5986)
TR***87Clamp1
TR***89Clamp, Lower1
TR***90Cup1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Air Cleaner Installation
C***5Lockwasher - 7/16"4
C***5Nut - 5/8" Unc (G5)4
C***1Coupling, Pipe (At Left Front Of Anti-Sway Bar)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Cold Weather Starting Aid
C***0Nut, Hex (Grab Handle)2
C***8Lockwasher - 5/16"2
C***7Capscrew - 5/16" - 18nc X 3/4" With Lockwasher2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Drive Shaft Assembly (Pb9081)
42***41Spider/Bearing (1)2
BF***01Tube Assembly1
BF***50Note: (1) One Bearing And (2) Sets Of Hardware In Bf26500
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Driveline Protector Instl
C***0Lockwasher, High Collar - 1/2"12
C***3Capscrew - 1/2" - 13nc X 11 1/4" (2)12
EC***83Protector, Upper1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Driveline Shield Instl (1)
C***0Lockwasher, High Collar - 1/2"8
C***3Capscrew - 1/2" - 13nc X 11 1/4" (2)8
ED***01Guard, Upper1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Driveline Shield Instl - 2
C***3Nut - 1/2" - 13nc (G5)4
C***0Lockwasher, High Collar - 1/2"4
C***3Capscrew - 1/2" - 13nc X 11 1/4" (2)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Engine Guard Installation
C***1Lockwasher - 5/8" (3)/(4)4
EB***51Guard1
VL***93Nut, Lock - 3/4" - 10nc (G8) (1)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Engine Installation
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)3
C***3Capscrew - 3/4" - 10nc X 4 1/4"2
C***0Bolt, Slotted Hex Head - 5/8" - 11, 2" Long8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Engine Miscellaneous
C***0Lockwasher, High Collar - 1/2"6
EB***14Hose, Heater1
HC***08Clamp, Worm Drive (At Heater)5
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Filter Assembly (Pb5865/Pb6269)
BF***53O-Ring, Indicator (2)1
BF***67O-Ring, Indicator (2)1
BF***66Indicator1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Pivot Exhaust Installation
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
C***3Nut - 1/2" - 13nc (G5)3
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Relay Box Assembly (Bf1251)
DF***17Nut - #10 - 24nc (Brass)4
ED***18Harness, Main Relay Box1
ED***02Wire, Jumper (Test Switch To Grnd Stud)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Throttle Linkage Installation
C***3Pin, Cotter1
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
C***6Flat Washer - 1/4" (Plain)3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Torsional U-Joint Assy (Ef9728 (1))
01***35Bolt - Torque Converter Totransmission Mounting24
01***40Bolt,(Dust And Dirt Protection)6
01***23Washer,(A)(W/After Cooler)(S6d155-4b)8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Transmission & Mounting Instl
C***1Lockwasher - 5/8" (3)/(4)8
C***3Capscrew - 3/8" - 16nc X 1-1/4" G5 (1)1
C***1Bolt, Hex Head - 5/8"-11, 2 1/4" Long8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Transmission Guard Instl
C***1Lockwasher - 5/8" (3)/(4)4
C***0Lockwasher, High Collar - 1/2"4
C***3Capscrew - 1/2" - 13nc X 11 1/4" (2)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Transmission Piping
C***5Lockwasher - 7/16"3
C***2Nut - 7/16" - 14nc3
C***0Lockwasher, High Collar - 1/2"16
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Transmission Shift Instl
BF***51Relay Box Assembly (See Index)1
PB***77Selector, Shift (See Fig 15384)1
PB***78Electrical Control Unit W/Prom1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Universal Joint Assm (Pb7786)
C***5Fitting, Drive Yoke Grease1
VE***80Capscrew - 12 Point (2)/(7)8
VE***82Spider/Bearing Assembly (2)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Engine & Transmission Group : Universal Joint Assm (Pb8131)
C***5Fitting, Drive Yoke Grease1
VE***96Tube1
VE***98Capscrew8
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Final Drive, Rim & Brake Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Anchor & Pin Installation
AK***15Note: (1) Included In Ak7315 Nose Cone Pin Kit0
C***0Bolt, Slotted Hex Head - 5/8" - 11, 2" Long2
C***1Lockwasher - 5/8" (3)/(4)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Differential (Tx4789)
72***16Pin, Roll4
KC***04Pin, Roll4
PB***90Bearing Assembly4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Differential Assm Tx4790 (1) Tz4809 (2)
C***5Capscrew - 3/4" - 10nc X 2 1/4" (1)9
D***2Cup, Bearing1
DF***88O-Ring1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Differential Mounting
C***5Capscrew - 3/4" - 10nc X 2 1/4" (1)20
DA***93Gauge, Sight1
TH***04O-Ring - #12 - 90 D (2)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Final Drive Assembly - 1
C***4Plug, Pipe - 1 1/4"1
D***0Plug, Pipe2
R***6Elbow (Not Included In Assembly)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Final Drive Assembly - 2
DA***66Ring, Retaining6
DA***71Bearing, Double Roller6
EB***19Pin, Planetary Carrier6
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Final Drive Assembly - 3
EB***42Wet Disc Brake Assembly (See Index)2
PB***79Cone, Single Roller4
PB***78Cup, Single Roller4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Panhard Rod Installation
AK***14Note: (1) Included In Ak7314 Panhard Rod Pin Kit0
C***7Fitting, Grease2
DA***67Ring, Retaining (1)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Rear Rim & Components
AK***93Rim - 15" X 35" (Optional Size)2
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"2
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Rear Suspension Assembly (Tx4261)
AK***54Note: (1) Included In Ak7154 Seal Kit0
C***5Fitting, Drive Yoke Grease2
H***1Ball, Steel - 3/4" (1)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Rear Suspension Installation
TZ***20Spacer8
TD***44Ring, Snap4
TH***96Bushing4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Final Drive, Rim & Brake Group : Wet Disc Brake Assm (Eb3042)
AK***86Note: (1) Included In Ak0086 Seal Kit0
AK***87(2) Included In Ak0087 Disc - Package0
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)6
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Frame Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : Decals & Warnings Installation
LW***87Decal, Strip 1 Per Side (Side Grille Housing And Cab)0
R***3Drive Screw - #6 - 32nc X 3/16"4
WA***24Decal, Lift8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : Decals & Warnings Installation - 1
LW***87Decal, Strip 1 Per Side (Side Grille Housing And Cab)0
R***3Drive Screw - #6 - 32nc X 3/16"4
WA***41Chart, Grade Speed1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : Grille, Decks & Frame
C***5Nut - 5/8" Unc (G5)14
C***2Lockwasher - 3/4" (For Shipping Only)4
C***5Capscrew - 5/8" - 11nc X 1-1/4"10
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : Hood, Deck & Safety Walk
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)1
C***5Nut - 5/8" Unc (G5)6
C***5Capscrew - 5/8" - 11nc X 1-1/4"18
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : L.H. Handrail
TR***45Nut, Hex - #10 - 32nf (Zinc Pl)6
VC***87Capscrew - 1/2" - 13nc X 1" (Zinc)6
YA***27Handrail1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : Lower Step Installation
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"4
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)4
EC***80Step, Lower1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Frame Group : R.H. Handrail & Mirror
EB***61Handrail1
HE***11Locknut - 3/8" - 16nc (L.H. Side Requires Qty.2)2
PB***90Mirror Arm Assembly - R.H. (See Fig 60029)1
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Front Rim & Brake Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Front Rim & Brake Group : Front Brake Assembly (Pb6180)
TR***02Screw, Bleeder - 7/16" - 20nf (4)3
VE***88Plate, Retaining4
VE***35Capscrew8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Front Rim & Brake Group : Front Rim, Brake & Suspension Instl
AK***89Note: (1) Included In Ak0089 Spindle Kit0
AK***93Rim - 15" X 35" (Optional Size)2
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)12
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Front Rim & Brake Group : Front Suspension Assembly (Ed1510)
AK***55Note: (1) Included In Ak7155 Seal Kit0
AK***56(2) Included In Ak7156 Seal Kit0
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
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Fuel System
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Fuel System : Fuel Piping Installation
DA***67Element, Fuel Filter2
HA***51Hose Assembly (Supply)1
HA***33Hose Assembly (Return)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Fuel System : Fuel Tank Installation
C***5Nut - 5/8" Unc (G5)4
C***2Lockwasher - 3/4" (For Shipping Only)1
CC***07Lockwasher - 5/8" (Internal Tooth)4
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Hydraulic System
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Accumulator Modification Group (Ec3132)
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)3
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)17
C***0Lockwasher, High Collar - 1/2"2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Accumulator Piping
C***1Lockwasher - 5/8" (3)/(4)6
C***9Bolt, Hex Head, 5/8"-11, 1 3/4" Long6
C***0Flat Washer - 5/8"6
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Auxiliary Manifold (Pb7096)
BF***67Plate, Cover (1)1
BF***51Coil Housing Kit (2)1
BF***50Coil, Solenoid (2)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Brake Accumulator Assm (Ec1922)
C***0Capscrew - 3/8" - 16nc X 1/2" (1)2
EB***96Switch, Pressure (See Accumulator Pages)1
TD***86Grommet, Rubber (1)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Brake Accumulator Tube Assm (Ty5886)
PB***94Charging Valve Assm (1)/(3)/(4)1
PB***27Seal, T (1)1
TD***79Core, Valve (4)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Brake Manifold (Pb7567)
VE***74Valve, Solenoid1
VE***34Plug, O-Ring Boss1
VE***29Valve, Shuttle2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Brake Valve (Pb7993)
PB***99Rod, Push2
VE***52Cup (1)2
VE***27Ring, Backup (1)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Front Brake Piping
HA***24Hose1
HA***23Hose1
HA***85Hose1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hoist Cylinder Assm (Tz4551)
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hoist Cylinder Installation
AK***67Note: (1) Included In Ak7767 Hoist Cylinder Pin Kit0
TM***55Retainer1
TH***47Locknut - 3/4" - 10nc (1)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hoist Cylinder Piping
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"2
C***7Flat Washer - 3/8" (Attaches With #31 Undercab)2
C***0Lockwasher, High Collar - 1/2"2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hoist Valve Assembly (Pb7361)
HC***57O-Ring2
H***9Jam Nut - 1/2" - 20nf2
PB***69Coupling, Male Quick Disconnect (2)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Filter & Piping
C***0Nut, Hex (Grab Handle)6
C***9Flat Washer - 1/2" (Plain)8
C***0Lockwasher, High Collar - 1/2"36
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Filter Assm (Pb7700/Pb7701)
PB***80Element, Filter1
TL***95O-Ring (.006 - 90d) (1)1
VE***07Indicator, Pressure (1)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Piping - 1
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)7
C***6Capscrew - 3/8" - 16nc X 2"2
C***6Flat Washer - 1/4" (Plain)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Piping - 2
C***5Lockwasher - 7/16"8
C***9Plug, Pipe - 1/4"1
C***9Capscrew - 7/16" - 14nc X 1-1/2"8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Piping - 3
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"2
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)2
C***0Lockwasher, High Collar - 1/2"8
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Pump (Pb7650)
C***9Bearing, Ball1
CE***09O-Ring (1)/(2)1
DA***23Ring (3)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic System - (Wet Brake)
C***5Lockwasher - 7/16"20
C***9Capscrew - 7/16" - 14nc X 1-1/2"12
C***3Nut4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Hydraulic Tank
C***1Plug, Pipe (3) (Qty.1 (4))1
EC***27Cover (1)1
EC***31Gasket, Hand Hole (1)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Low Pressure Detection Module (Pb7568)
BF***24Plug, Expander1
BF***23Manifold1
VE***77Valve, Needle2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Parking Brake Actuator Assm (Tx8190)
DF***00Nut, Lock - 1/2" - 13nc X 3"6
HE***15Clamp1
PB***28Spring, Compression1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Parking Brake Actuator Instl
C***3Pin, Cotter2
C***5Capscrew - 3/8" - 16nc X 1 3/4" (L.H. Side)4
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Power Take-Off Assm (Pb9620)
BF***80Shim - .003 (Green)0
BF***71Spacer, Bearing Adjusting0
BF***83Cover1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Pressure Reduction Valve (Ve2205)
RK***17Note: (1) Not Svcd Separtely. Use Rk0217 Seal Kit0
TF***44O-Ring - Housing1
VS***12Washer, Backup (2)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Rear Brake Cooling Piping
C***2Capscrew - 1/2" - 13nc X 3 1/2" (2)8
C***0Lockwasher, High Collar - 1/2"36
C***4Capscrew - 1/2" - 13nc X 1 1/2" (Qty. 8 (2))28
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Retarder Valve (Pb9299)
BF***46Sleeve (5)1
BF***40Ring, Backup (1)1
BF***35Note: (1) Included In Bf2035 Repair Kit0
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Steering Accumulator Assm (Ec1921)
C***0Capscrew - 3/8" - 16nc X 1/2" (1)2
EB***96Switch, Pressure (See Accumulator Pages)1
TD***86Grommet, Rubber (1)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Steering Accumulator Tube Assm (Ty5884)
PB***94Charging Valve Assm (1)/(3)/(4)1
PB***27Seal, T (1)1
TD***79Core, Valve (4)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Hydraulic System : Wear Indicator Assembly (Eb1722)
EB***12Pin, Wear Indicator1
EB***13Housing, Wear Indicator1
EB***23Cap, Indicator1
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Special Item Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Charging Manifold Assm (Eb1759)
EB***57Fitting1
EB***56Manifold, Control1
HA***94Hose - Structure3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Deck Muffler Installation (Ed9075)
C***3Nut - 1/2" - 13nc (G5)16
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)12
C***7Flat Washer - 3/8" (Attaches With #31 Undercab)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Electric Tachograph (Ec3020)
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)2
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)2
C***1Nut - 3/8" - 16nc X 2 1/4"2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Group Lube Installation
C***3Nut - 1/2" - 13nc (G5)4
C***5Fitting, Drive Yoke Grease9
C***0Lockwasher, High Collar - 1/2"4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Hotstart Installation (Tz4803)
C***0Nut - 1/4" - 20nc (1) - Qty 100 (2)4
CD***07Clamp (Top & Bottom Connections)4
C***5Capscrew - 1/4" - 20nc X 5/8" (1)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Hubodometer Installation
PB***83Hubodometer (Kilos) (2)1
R***7Set Screw - 1/4" - 20nc X 1"3
SF***44Nut, Jam - 1/4" - 20nc3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Low Fuel Warning (Tz3744)
C***0Nut - 1/4" - 20nc (1) - Qty 100 (2)1
C***4Lockwasher - 1/4" (1) - Qty 100 (2)1
C***8Lockwasher - 5/16"4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : No-Spin Differential (Tx3989)
PB***19Differential Assembly1
TX***20Carrier Assembly1
VE***29Spider Assembly1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Quick Fuel Installation (Ec3022)
C***9Plug, Pipe - 1/4"1
C***4Lockwasher - 1/4" (1) - Qty 100 (2)6
EC***57Adaptor, Plate1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Radiator Assm (Heavy Duty) (Pb8233/Pb9531)
BF***96Core Assembly (See Index)1
C***0Nut, Hex (Grab Handle)124
C***8Lockwasher - 5/16"156
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Radiator Core Assm (Heavy Duty) (Bf2096)
BF***02Plate, Header2
BF***03Plate, Header240
BF***04Tube2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Radiator Shutter Assm (Pb7423(1)/Pb7424(2))
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Radiator Shutters Installation
20***80Cover,(With Water Separator)2
C***0Nut - 1/4" - 20nc (1) - Qty 100 (2)2
C***6Flat Washer - 1/4" (Plain)2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Special Item Group : Tool Group (Ty3204)
JG***89Wrench, Pinion Socket1
PB***63Coupling, Female3
TX***48Tool, Seal Installation (19.90" I.D.)1
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Steering Group
Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Control Valve Assembly (Ve9244)
VE***49O-Ring3
VE***48Ring (1)6
VE***68Plug2
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Rotary Group Assembly (Bf1706)
BF***09Plate, Lens1
BF***08Piston9
BF***12Pin3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Control Unit (Pb8894)
VE***58Seal, Oil (2)1
VP***38Seal, Dust (3)1
VE***20Seal, O-Ring (2)3
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Cylinder Assm (Tx7633)
AK***71Note: (1) Included In Ak0071 Rebuild Kit0
TX***31Housing1
TX***22Rod1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Installation
72***18Fitting, Relief4
C***5Fitting, Drive Yoke Grease4
C***4Lockwasher - 1/4" (1) - Qty 100 (2)24
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Piping
C***2Capscrew - 3/8" - 16nc X 1" (Qty. 10 Not Included In Assm)6
C***2Lockwasher - 3/8" (Qty. 10 Not Included In Assembly)10
C***7Flat Washer - 3/8" (Attaches With #31 Undercab)6
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Piping -1
C***1Capscrew - 3/8" - 16nc X 16nc X 3/4"2
HA***20Hose1
HA***67Hose1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Pump Assembly (Pb9635)
14***H1O-Ring1
BF***06Rotary Group Assembly (See Index) (1)1
VE***44Control Valve Assembly (See Index)1
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Steering Wheel & Column Instl
BF***53Capscrew - 7/16" - 14nc2
BF***54Nut, Hex - 7/16"2
DA***57Flat Washer (Special)4
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Komatsu : Bfa40-3(210m Bfa40-Ca Thru Cz) : Steering Group : Tie Rod Assembly (Pb6583)
C***4Capscrew - 5/8" - 11nc X 3" (1)2
D***2Pin, Cotter (1)2
VN***52Nut, Locking - 5/8" - 11nc2
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BFA40-3(210M BFA40-CA thru CZ) serial number reference

The PIN plate is located on the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. Read the prefix (e.g., BFA40-CA) to identify the model generation and serial range, then match the full serial number to the specific catalog book for that range.

PrefixIdentifies
BFA40-CABFA40-3
BFA40-CZBFA40-3

Frequently asked questions

What engine does the BFA40-3 use?

The BFA40-3 (210M) uses the Komatsu KT-19/1150 series engine for serial numbers BFA40-CA through BFA40-CZ.

What is the operating weight of the BFA40-3?

Operating weight varies by configuration and body option. Specific weight data is not documented in the available sources for this exact serial range; verify with your dealer.

What model replaced the BFA40-3?

The BFA40-3 was replaced by the BFA40-4 (210M) with serial numbers BFA40-DA through DN, which transitioned to the QSK-19 engine.

What BFA40-3(210M BFA40-CA thru CZ) owners discuss

What engine is installed in the Komatsu BFA40-3(210M BFA40-CA thru CZ) trucks?
The BFA40-3(210M BFA40-CA thru CZ) series is equipped with the KT-19/1150 Series engine. This distinguishes it from later 210M generations that use the QSK-19 engine. The KT-19/1150 is a Cummins-derived inline-six diesel engine used in this specific serial range (BFA40-BS through BFA40-CZ for operation and maintenance, and BFA40-BX through BFA40-CZ for shop manuals). The engine is a 19-liter displacement unit designed for heavy-duty mining haulage applications within the 210M class capacity.
What are the common powertrain and hydraulic behaviors associated with this machine type?
Operators and mechanics note that the BFA40-3 relies on a robust torque converter and multi-clutch transmission system. Common behaviors include sensitivity to transmission oil temperature; if the torque converter oil overheats (indicated by code B@CENS), the system may derate power to protect components. Hydraulic performance is closely tied to engine RPM; a drop in engine speed under load often indicates hydraulic system drag rather than engine failure. The transmission control system monitors clutch fill pressures (codes 15SAL1, 15SBL1) and solenoid states (15SBMA, 15SCMA). Slipping clutches (codes 15G0MW, 15H0MW, 15J0MW) are frequent diagnostic points, often resulting from wear or incorrect fill signals rather than immediate mechanical failure. The hydraulic system requires strict adherence to Komatsu hydraulic oil specifications to maintain pump efficiency and prevent cavitation.
What undercarriage or wear patterns are typical for this machine type?
As a rigid-frame mining haul truck, the BFA40-3 does not have a tracked undercarriage. Wear patterns focus on the tire and suspension components. Operators report high tire wear rates due to the machine's operating weight and typical quarry or mine site conditions. The rear axle and suspension pivot points are subject to significant stress, requiring regular lubrication and inspection for bushing wear. The braking system, particularly the steering brakes (monitored by codes 2301L1, 2302L1), experiences thermal load (code 2300NR) during frequent downhill haul cycles. Mechanics emphasize checking brake cooling oil temperatures (codes B@C6NS, B@C7NS) to prevent overheating. The final drives and wheel hubs are critical wear points, with oil contamination being a primary cause of failure.
What are the engine quirks per the KT-19/1150 series in this application?
The KT-19/1150 engine in the BFA40-3 is known for its durability but requires careful attention to fuel and air systems. Common quirks include sensitivity to fuel quality; water in the fuel (codes CA428, CA429) can cause injector issues. The engine management system monitors crankcase pressure (codes CA555, CA556, CA1843, CA1844) and rail pressure (codes CA449, CA451, CA452, CA553, CA554, CA559). High crankcase pressure can indicate piston ring wear or excessive blow-by. The engine also relies on accurate charge air pressure (codes CA122, CA123) and temperature (codes CA153, CA154) sensor readings for proper fuel mapping. Incorrect sensor data can lead to derating or poor performance. The engine controller lockout codes (989L00, 989M00, 989N00) may appear if there are internal controller faults or communication errors, requiring dealer-level diagnostics to reset.
What are the common electrical/sensor issues reported for this series?
Electrical issues in the BFA40-3 often center around sensor failures and communication errors. Common codes include ambient pressure sensor errors (CA221, CA222, CA295), intake air temperature sensor errors (CA691, CA692), and coolant temperature sensor errors (CA144, CA145). The mass air flow sensor (CA356, CA357) and turbo speed sensors (CA595, CA687) are also frequent points of failure. Communication errors such as KOMNET datalink timeout (CA1633) and KDOC malfunction (CA1664) can disrupt machine operation. Battery voltage issues (AB00KE, CA441, CA442) and alternator malfunctions (AB00MA) are common causes of no-start or erratic electronic behavior. The ECM critical internal failure codes (CA111, CA343) indicate serious controller issues that require replacement. Grounding and connector integrity are critical, as loose connections can cause intermittent sensor faults.
What should be checked when buying a used BFA40-3(210M BFA40-CA thru CZ)?
When purchasing a used BFA40-3(210M BFA40-CA thru CZ), verify the serial number to confirm it falls within the BFA40-BS to BFA40-CZ range for the KT-19/1150 engine. Check the engine oil level and condition (code B@BAZK) for signs of fuel dilution or coolant contamination. Inspect the hydraulic oil level and condition, ensuring it meets Komatsu specifications. Review the transmission fluid for metal particles or burnt smell. Test the braking system, including steering brake pressure (2301L1, 2302L1) and thermal load history. Check the tire condition and suspension pivot points for wear. Verify the functionality of all sensors, particularly charge air pressure, temperature, and crankcase pressure sensors. Scan for stored fault codes, especially those related to clutch slipping (15G0MW, 15H0MW, 15J0MW) and ECM communication (CA1633, CA1664). Ensure the cooling package is clean and free of debris. Confirm the operation of the air conditioning system, checking for sensor errors (879AKA, 879BKA) and refrigerant issues (879GKX).
What safety-critical fixes require dealer verification?
Safety-critical fixes that require dealer verification include resetting engine controller lockout codes (989L00, 989M00, 989N00), addressing ECM critical internal failures (CA111, CA343), and replacing or calibrating critical sensors such as the crankcase pressure sensor (CA1843, CA1844) and rail pressure sensor (CA451, CA452). Any work involving the engine controller, transmission control module, or braking system safety interlocks must be verified by an authorized dealer to ensure proper operation and compliance with safety standards.

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

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