Komatsuengine(no series)

Komatsu NH-220-CI-2F(S/N 100101-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live NH-220-CI-2F(S/N 100101-UP) parts

The Komatsu NH-220-CI-2F (S/N 100101-UP) is a heavy-duty industrial engine belonging to the NH-220 series, primarily powering Komatsu crawler excavators such as the PC220-8 and PC220LC-8. This generation represents the mid-size excavator class, typically operating in the 20,000 to 25,000 lb weight range. The NH-220-CI-2F succeeded earlier NH-220-CI-1F and NH-220-CI-1K variants, marking a shift toward more robust powertrain integration for the 22-ton class. Configurations offered include standard and long-reach boom setups, with power output generally rated around 168 HP (125 kW) at 2000 rpm. The machine lineage connects to the broader PC220 family, serving as a workhorse for earthmoving, trenching, and civil infrastructure projects.

Across the NH-220 series generations, the primary changes involved emissions compliance upgrades, hydraulic system refinements, and structural reinforcement to handle increased duty cycles. The NH-220-CI-2F specifically addresses the need for reliable power in Tier 4 interim environments, utilizing specific lubricant formulations and filtration strategies to maintain performance. In the used and parts market, this machine matters because it bridges the gap between older mechanical systems and modern electronic controls. Owners seek specific fluid specifications, KOWA analysis data, and genuine Komatsu lubricants to extend life, while the availability of specific engine components like pistons, connecting rods, and seals ensures that overhauls remain cost-effective compared to replacement.

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 NH-220-CI-2F(S/N 100101-UP) specifications

Engine

Engine Model	S6D105
Gross Power	136 hp (101 kW)
Net Power	125 kW (168 hp) @ 2000 rpm
Displacement	396 cu in (6.5 L)
Cylinders	6
Aspiration	Turbocharged
Emissions Tier	Not documented for this exact serial range — verify with your dealer

Weights

Operating Weight	48,060.8 lb (21,800 kg)
Shipping Weight	Not documented for this exact serial range — verify with your dealer
Ground Pressure	7 psi (48 kPa)

Dimensions

Transport Length	32.4 ft (9.87 m)
Transport Width	9.81 ft (2.99 m)
Transport Height	10.04 ft (3.06 m)
Track Gauge	7.81 ft (2.38 m)
Ground Clearance	1.5 ft (0.46 m)
Height to Top of Cab	9.63 ft (2.94 m)
Tail Swing Radius	9.52 ft (2.90 m)
Removal Counterweight Clearance	3.22 ft (0.98 m)

Performance

Max Travel Speed	1.31 mph (2.11 km/h)
Swing Speed	11.5 rpm
Hydraulic System Relief Valve Pressure	3,980 psi (27.4 MPa)
Hydraulic Pump Flow Capacity	116.8 gal/min (442 L/min)
Dig Depth (Max)	24.41 ft (7.44 m) with Stick 11'142 " (3610 mm)
Max Reach Along Ground	34.95 ft (10.65 m) with Stick 11'142 " (3610 mm)
Gradeability	Not documented for this exact serial range — verify with your dealer

Service capacities (summary)

Fuel Tank Capacity	68.7 gal (260 L)
Hydraulic System Fluid Capacity	47.6 gal (180 L)
Engine Oil Capacity	Not documented for this exact serial range — verify with your dealer
Cooling System Capacity	Not 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 NH-220-CI-2F(S/N 100101-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and condition. Check hydraulic fluid level at sight glass. Check coolant level and ensure cap is secure. Check fuel level and drain water from separator. Check DEF level on Tier 4 machines. Check air filter restriction indicator.
Every 250 h	Change engine oil and filter. Grease all points on boom, stick, bucket, and swing bearing. Check fluid levels across all systems. Check air filter outer element. Inspect belts and hoses for wear or damage. Perform visual walk-around inspection.
Every 500 h	Replace fuel filter. Replace hydraulic return filter. Perform battery load test and service terminals. Test coolant SCA concentration. Collect KOWA oil sample for analysis. Perform detailed undercarriage visual inspection.
Every 1,000 h	Change final drive oil on both sides. Inspect turbocharger condition. Check and measure wear on critical components. Check valve adjustment status. Perform structural inspection of boom and stick. Clean or replace air filter outer element.
Every 2,000 h	Change hydraulic system oil. Flush and replace coolant. Service transmission system. Perform comprehensive component evaluation. Inspect KDPF system. Replace worn belts and hoses.

Servicing the NH-220-CI-2F(S/N 100101-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize 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 scaling and corrosion in the NH-220-CI-2F cooling system. Monitor DEF levels daily on Tier 4 compliant units to ensure emissions system integrity. Track fuel consumption trends via KOMTRAX telematics to identify early signs of injector or turbo inefficiency. Use Komatsu Genuine Lubricants to maintain viscosity and additive packages specified for the SAA6D102E-22A-8 engine architecture.

Corrective & Common Repairs

Address hydraulic solenoid circuit faults (DW/DX codes) by inspecting wiring harnesses and valve connections on the NH-220-CI-2F control panel. Replace worn track chains and sprockets when undercarriage wear measurements exceed factory limits to prevent final drive overload. Fix hydraulic hose leaks promptly to avoid contamination of the swing machinery case. Repair or replace faulty pressure sensors indicated by D-codes to restore accurate ECM feedback. Inspect and clean the KDPF system to maintain exhaust flow and prevent turbocharger damage from backpressure.

Overhaul & Rebuild Points

Plan major engine overhaul around 12,000 hours, focusing on piston rings, cylinder liners, and connecting rods for the NH-220-CI-2F. Rebuild the main hydraulic pump and swing motor when flow rates drop below specification or internal wear metals spike in oil analysis. Inspect final drives for seal leaks and gear wear, replacing units if oil contamination exceeds acceptable limits. Evaluate structural integrity of the boom and stick welds during the 18,000-hour inspection phase. Replace all belts, hoses, and clamps during the 2,000-hour comprehensive service to prevent sudden failure.

Seasonal & Environment Servicing

In cold climates, verify coolant freeze protection and use appropriate viscosity engine oil to ensure cold starts for the NH-220-CI-2F. Drain water from the fuel separator daily in humid or wet conditions to prevent microbial growth and injector corrosion. In dusty environments, inspect the air filter restriction indicator more frequently and clean the radiator and oil cooler fins to prevent overheating. Adjust track tension according to ground conditions to reduce undercarriage wear on abrasive surfaces. Monitor battery health regularly, as cold temperatures reduce cranking power and increase electrical load.

NH-220-CI-2F(S/N 100101-UP) common service parts

Part number	Part	Notes
07281-00197	Clamp,(With Pre-Fuel Filter)	Fuel system service	Check fitment →
6631-71-8002	Fuel Filter Ass'Y	Fuel system service	Check fitment →
09637-02161	Plate? Instruction,Air Cleaner (Double Element)	Air intake service	Check fitment →
09637-30161	Plate? Instruction,Air Cleaner (Single Element)	Air intake service	Check fitment →
07000-02075	O-Ring,Steering Oil Filter	Lubrication service	Check fitment →

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

NH-220-CI-2F(S/N 100101-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CA115	Engine crankshaft speed sensor failure	Broken sensor, wiring issue, or connector corrosion	Replace the speed sensor and verify the voltage at the pin connector
CA111	Internal engine controller fault	ECM hardware failure	Replace or reprogram the ECM
CA441	Battery voltage too low	Weak battery or charging system failure	Replace the alternator or battery; check the voltage regulator
CA442	Battery voltage too high	Alternator overcharging or regulator failure	Replace the alternator or battery; check the voltage regulator
CA451	Common rail pressure sensor feedback value too high	Malfunction in the rail sensor or actual overpressure condition	Diagnose the fuel rail pressure sensor or pump lines
CA234	Engine overspeed	Throttle calibration error, engine load cycle issue, or operator misuse	Verify throttle calibration and engine load cycle
AA10NX	Air cleaner clogging	Dirty or blocked air filter element	Replace the air filter
CA122	Intake air pressure high voltage	Sensor malfunction or wiring issue	Verify the intake pressure sensor and wiring
CA123	Intake air pressure low voltage	Sensor short or airflow restriction	Check for a sensor short or an airflow restriction
CA153	Intake air temperature sensor error (high)	Sensor failure or wiring fault	Replace or test the IAT sensor

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

NH-220-CI-2F(S/N 100101-UP) attachments & work tools

Buckets

Standard and heavy-duty digging buckets are the primary work tools for this machine class. Typical capacities vary by configuration/series based on material density and application requirements.

Hydraulic Breakers

Hydraulic breakers require a specific high-flow auxiliary hydraulic kit and mounting bracket assembly. Factory guarding options and hose routing configurations are necessary to protect components during operation.

Hydraulic Hammers

Compatible with standard hydraulic hammer configurations requiring auxiliary flow. Mounting systems utilize the machine's quick coupler interface for rapid tool changes.

Grapples

Rotating and stationary grapples are available for material handling. These tools require auxiliary hydraulic circuits for rotation and clamping functions.

Augers

Hydraulic drive augers are supported by auxiliary flow connections. Mounting brackets interface with the standard quick coupler system for installation.

Couplers

Mechanical and hydraulic quick couplers are the standard mounting systems for this model. The coupler interface matches the machine's pin spacing and hydraulic line configuration.

All NH-220-CI-2F(S/N 100101-UP) assemblies by section

Every catalogued assembly group for the Komatsu NH-220-CI-2F(S/N 100101-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Cooling And Electrical Systems

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Alternator (800w)(#128831-)

KD***52	Bolt	4
KD***80	Pulley	1
KD***80	Rear Bracket Ass'Y	1
KD***02	Washer,Spring	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Alternator And Mounting(#128831-)

01***30	Bolt,Radio Controlled Slag Handling	1
01***35	Bolt,(Cold Weather Spec.)	1
01***40	Bolt,(Cold Weather Spec.)	1
01***11	Nut,(For Center Guard)	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Alternator(#128831-)

KD***20	Pulley	1
KD***80	Packing	1
KD***72	Slip Ring Ass'Y	1
KD***90	Wire,Read	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Corrosion Resistor(#100101-112050)

01***40	Bolt,(Dust And Dirt Protection)	2
01***36	Washer,Radio Controlled Slag Handling	2
01***23	Washer, Flat	2
02***32	Bolt	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Corrosion Resistor(#112051-)

01***29	Washer,Spring (Cold Weather Spec.)	4
01***38	Washer,Radio Controlled Slag Handling	2
01***16	Washer,Radio Controlled Slag Handling	4
02***32	Bolt,(With Joy Stick Steering)	4

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Dynamo And Mounting(#100101-128830)

01***30	Bolt,Radio Controlled Slag Handling	1
01***35	Bolt - Torque Converter Totransmission Mounting	1
01***10	Nut,(Dust?Drip Proof? Trimming S.)	1
01***36	Washer,Radio Controlled Slag Handling	3

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Dynamo(#100101-128830)

KD***20	Brush Ass'Y	4
KD***30	Rear Bracket Ass'Y	1
KD***00	Band	1
KD***30	Pulley Ass'Y	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Regulator And Safety Relay

60***10	Regulator Ass'Y,For 35a Alternator (Not Shown)	1
60***20	Safety Relay A.,Safety	1
60***10	Safety Relay A.,Safety (For 800w Alternator)	1
60***00	Regulator Ass'Y	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Starting Motor (11kw) (For Cold Weather)

60***24	Starting Motor A.,(11kw) (Cold Weather Spec.)	1
KD***00	Seal Ass'Y,(Not Shown)	1
KD***82	Screw,Dish	8
KD***60	Field Coil Ass'Y	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Starting Motor And Mounting

01***30	Bolt,(Cold Weather Spec.)	2
01***45	Screw	3
01***29	Washer,Spring (Cold Weather Spec.)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Starting Motor(#100101-132064)

60***11	Starting Motor A.,(7.4kw)	1
60***20	Starting Motor A.,(7.4kw)	1
KD***50	Field Coil Ass'Y	1
KD***80	Metal	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Starting Motor(#132065-)

60***12	Starting Motor A.,(7.4kw)	1
60***13	Starting Motor A.,(7.4kw)	1
KD***30	Clutch Ass'Y,Over Running	1
KD***70	Front Bracket Ass'Y	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cooling And Electrical Systems : Water Pump And Cooling Fan

01***16	Bolt (Welded)	4
01***20	Bolt,(Used When Towing Winch)	2
01***30	Bolt,Radio Controlled Slag Handling	6
01***40	Bolt,(Not Used With Cab)	3

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Cylinder Block

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Cam Follower And Push Rod

02***25	Bolt	18
02***20	Washer	18
02***24	Washer,Radio Controlled Slag Handling	18
66***10	Housing Ass'Y,Cam Follower	3

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Camshaft

02***25	Key	1
02***04	Plug,(Not Shown)	1
66***10	Gear,Camshaft	1
66***30	Washer,Thrust	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Crankshaft And Vibration Damper

01***40	Bolt,(Cold Weather Spec.)	6
02***04	Plug,(For Shipping)	6
66***81	Pin,Spring	2
66***20	Seal,Oil (K4)	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Cylinder Block (1/2)

02***25	Bolt	2
02***24	Washer,Radio Controlled Slag Handling	2
02***16	Pin,Dowel? Cam Follower	6
02***08	Elbow,Bypass Filter	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Cylinder Block (2/2)

02***19	Bolt	12
02***25	Bolt,(Cold Weather Spec.)	4
02***16	Washer,Radio Controlled Slag Handling	12
02***24	Washer,Radio Controlled Slag Handling	4

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Flywheel And Flywheel Housing

04***38	Bolt,Eye (For Lifting)	2
07***16	Plug,Expansion	2
61***30	Plug, No. 4	2
66***11	Bolt	3

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Gear Case Cover And Front Support

02***19	Bolt	2
02***51	Bolt	15
02***64	Bolt	1
02***51	Bolt	15

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Oil Pan

01***12	Bolt,(Without R.P.C.U.)	4
01***30	Bolt,(Cold Terrain Spec.)	1
01***30	Bolt,(For France Noise Suppression)	2
01***30	Bolt,Radio Controlled Slag Handling	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Piston And Connecting Rod

66***30	Ring,Snap	2
66***41	Crank Pin Metal A	6
66***11	Bolt	2
66***20	Nut	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Power Take Off (1/2)

01***20	Bolt,(Sandy? Dusty Terrain Spec.)	6
01***25	Bolt,(Sandy? Dusty Terrain Spec.)	4
01***30	Bolt,(For France Noise Suppression)	4
01***40	Bolt,(Dust And Dirt Protection)	4

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Power Take Off (2/2)

01***12	Bolt,(Without R.P.C.U.)	4
01***35	Bolt - Torque Converter Totransmission Mounting	4
01***40	Bolt,(Dust And Dirt Protection)	10
01***45	Bolt,(Cold Terrain Spec.)	16

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Block : Rear Cover

02***16	Bolt	4
02***25	Bolt	2
02***32	Bolt	2
02***44	Bolt	4

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Cylinder Head

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Air Cleaner(#100101-139166)

01***35	Bolt, Mounting - Flywheel Housing End	1
01***50	Nut,Wing	1
01***08	Nut, Regular Hexagon (M10-1.50)	1
01***08	Nut,R.H. Thread	6

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Air Cleaner(#139167-)

01***08	Nut,R.H. Thread	6
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	6
01***16	Washer,(With Water Separator)	6
04***10	Ring,See Fig. K4010-65a0	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Air Intake Manifold And Connection

01***30	Bolt,(Cold Terrain Spec.)	4
01***30	Bolt,(For France Noise Suppression)	4
01***35	Bolt - Torque Converter Totransmission Mounting	5
01***25	Washer,Spring?(Sandy And Dusty Spec.)	4

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Compression Release

01***40	Bolt,(Dust And Dirt Protection)	1
01***34	Washer,Spring	1
01***36	Washer,Radio Controlled Slag Handling	1
02***38	Bolt	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Cylinder Head

02***16	Plug	6
02***16	Screw	6
66***20	Nut	12
66***10	Collet,Half? Valve	16

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Exhaust Manifold And Muffler

01***20	Bolt,(Large Capacity Type) (Std)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***20	Bolt	2
01***25	Bolt	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Rocker Arm And Housing

02***89	Bolt	19
02***32	Washer,Spring	19
66***10	Nut	1
66***20	Housing Ass'Y,Rocker Arm	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Rocker Arm Housing Cover

02***32	Bolt	9
02***32	Bolt,(With Joy Stick Steering)	9
02***20	Washer	9
02***24	Washer,Radio Controlled Slag Handling	9

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Thermostat And Connector

02***25	Bolt,(Europe Spec.)	2
02***89	Bolt	4
02***95	Bolt	2
02***25	Bolt,(Cold Weather Spec.)	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Cylinder Head : Water Manifold

02***22	Bolt	12
02***20	Washer,Spring	12
02***04	Plug,(For Shipping)	1
02***10	Plug (Heater Not Installed)	1

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Fuel System

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Fuel Filter

01***12	Bolt (M8-1.25x12)	1
01***40	Bolt,(For Position Fixing)	2
01***34	Washer,Spring	2
02***70	Bolt	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Injector And Fuel Connection

66***21	Body Ass'Y	1
66***20	O-Ring	1
66***21	O-Ring	1
66***30	Gasket? 0.40mm,Classes 0 To 8	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (1/6)

02***06	Nut	2
02***04	Nut	2
02***18	O-Ring (K7)	1
04***50	Screw	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (2/6)

01***20	Washer,Spring	6
01***29	Washer,Spring (Cold Weather Spec.)	1
02***32	Bolt	6
02***44	Bolt	3

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (3/6)

02***32	Bolt	2
66***20	Ring,Snap	1
66***60	Guide Ass'Y,Plunger	1
66***61	Guide Ass'Y,Plunger	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (4/6)

01***20	Washer,Spring	1
02***38	Bolt	1
02***38	Bolt	4
02***04	Nut	3

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (5/6)

02***45	Bolt	2
02***16	Washer	2
02***12	Washer,Spring	2
02***12	Washer,Spring	4

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump (6/6)

02***32	Bolt	2
02***45	Bolt	2
02***57	Bolt	2
02***64	Bolt,(For Shipping)	6

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump And Piping

01***13	Nut	1
01***34	Washer,Spring	1
01***68	Washer,(Not Shown)	1
02***25	Bolt	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Pt Fuel Pump Drive

01***45	Washer	1
02***25	Bolt	2
02***40	Washer	1
02***28	Washer,Spring	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Water Separator(#.-)

07***12	Gasket,Mechanical Pump Piping	1
07***11	Plug,(For Shipping)	1
60***11	Water Separator A	1
60***21	Head	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Fuel System : Water Separator(#100101-.)

07***75	O-Ring,Steering Oil Filter	1
07***12	Gasket,Mechanical Pump Piping	1
60***60	Plug,Drain (For Pakistan)	1
60***70	O-Ring,(For Pakistan)	1

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Lubricating Oil System

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Lubricating Oil Bypass Filter

02***32	Bolt	2
02***20	Washer,Spring	2
02***01	O-Ring (Kit)	1
09***20	Plate? Instruction,(Japanese-English)	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Lubricating Oil Cooler

02***32	Bolt	5
02***24	Washer,Radio Controlled Slag Handling	5
02***06	Plug,(Not Shown)	1
66***11	Gasket (K4)	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Lubricating Oil Filter

02***51	Bolt	2
02***20	Washer	4
02***28	Washer,Spring	4
02***08	Plug,Water Header	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Lubricating Oil Piping

01***45	Bolt,(S6d155-4b)	6
01***25	Washer,Spring?(Sandy And Dusty Spec.)	6
02***44	Bolt,(Hexagon Head)	2
02***25	Bolt	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Lubricating Oil Pump

02***64	Bolt	2
02***22	Bolt	1
02***32	Bolt	2
02***76	Bolt,(Cold Weather Spec.)	6

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : Oil Cooler (Torqflow And Steering Clutch)

01***45	Bolt,(S6d155-4b)	2
01***50	Bolt,(For Trimming Dozer)	2
01***30	Bolt,(For France Noise Suppression)	6
01***60	Bolt (M10-1.50x60)	2

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Lubricating Oil System : P.T.O. Lubricating Oil Piping

01***30	Bolt,(For France Noise Suppression)	2
01***30	Washer,Spring(Sandy?Dusty Terrain S.)	2
07***12	O-Ring, Between Valve And Pump	22
66***10	Flange	1

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Tool And Kit

Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Tool And Kit : Gasket Kit

01***12	Washer,Lock (K5)	4
01***23	Washer,Lock (K5)	1
02***16	O-Ring (K2)	2
02***18	O-Ring (K7)	1

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Komatsu : Nh-220-Ci-2f(S/N 100101-Up) : Tool And Kit : Tool

09***00	Wrench,(Except Japan)	1
09***11	Wrench	1
09***14	Wrench	1
09***24	Socket,Socket	1

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NH-220-CI-2F(S/N 100101-UP) serial number reference

The PIN plate is riveted to the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. The prefix is the first 10 characters of the model designation stamped on the plate, identifying the engine family and series.

Prefix	Identifies	Notes
NH-220-CI-2F	Engine	Cummins NH-220-CI-2F engine. S/N 100101-UP. Compatible with Komatsu D65A-6, D65S-6, D65P-7, D65E-6, D65S-7, D75S-2, D60A-6, D60P-6, D60PL-6, D60S-6, D80A-12, D85A-12 dozers. Verified by parts catalog and engine overhaul kit listings. Confirm with dealer for specific dozer model fitment.

Frequently asked questions

What engine does the Komatsu NH-220-CI-2F use?

The Komatsu NH-220-CI-2F (S/N 100101-UP) typically utilizes the Komatsu SAA6D102E-22A-8 engine, a six-cylinder diesel powerplant rated at approximately 168 HP (125 kW) at 2000 rpm.

What is the operating weight of the Komatsu NH-220-CI-2F machine?

Operating weight varies by configuration and attachment package. For the PC220-8 and PC220LC-8 excavators powered by this engine series, the weight typically ranges from 22,840 kg to 23,360 kg (50,350 lb to 51,500 lb).

What machine replaced the Komatsu NH-220-CI-2F series?

The NH-220-CI-2F series was succeeded by later generation models in the PC220 family, such as the PC220-10 and PC220-11, which feature updated emissions tiers, improved hydraulic efficiency, and modernized electronic control systems.

What NH-220-CI-2F(S/N 100101-UP) owners discuss

What engine is installed in the Komatsu NH-220-CI-2F (S/N 100101-UP)?

The Komatsu NH-220-CI-2F (S/N 100101-UP) is equipped with a Cummins NH-220 series diesel engine. This model is distinct from the Komatsu SAA6D102E-22A-8 engine, which is used in other serial ranges and requires separate service documentation. The NH-220 is a six-cylinder inline configuration with a 4½-inch bore diameter and 3 1/0-inch connecting rod diameter. It produces 125 kW (168 HP) at 2000 rpm. The accessory drive layout places the alternator and water pump on the left side of the front cover, driven by a single belt from an accessory pulley. The fuel system utilizes a float tank and a fuel filter canister that must remain full to prevent air ingress. Cylinder numbering places #1 and #6 at the ends of the bank, which are common failure points for firing issues if fuel delivery is compromised.

What are the known hydraulic behaviors and common failure modes for this machine type?

The machine uses a load-sensing hydraulic system. A primary diagnostic pattern is sluggish performance across all functions (boom, arm, bucket, swing, travel), which indicates a shared upstream issue such as low hydraulic oil level, incorrect oil specification, clogged hydraulic filters, or engine speed loss under load. If only one function is slow, the fault is local to that circuit's control valve, cylinder, or hoses. A specific failure mode is hydraulic weakness that appears only when the oil is hot, caused by internal leakage in the main pump, control valve, or motors that is masked by higher viscosity when cold. The swing system is prone to drift if the swing brake fails to hold position or if there is mechanical play in the swing bearing. Travel issues often manifest as pulling to one side due to track tension differences or debris packing, rather than immediate motor failure.

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

Typical wear patterns include rapid undercarriage degradation in abrasive or high-impact environments. Track tension must be monitored regularly, as repeated loosening is a common symptom of worn idlers or improper adjustment. Track chains and rollers wear unevenly if the machine frequently operates on hard surfaces or turns sharply under load. The final drive cases are susceptible to contamination if seals fail, leading to gear noise and eventual failure. Swing bearing play can cause upper structure drift and uneven wear on the swing pinion and ring gear. Regular inspection of track shoe bolts and cutting edges is required to maintain ground pressure and prevent excessive stress on the final drives.

What are the common electrical and sensor issues reported for this series?

Electromechanical issues often stem from unstable power supplies or corroded connectors. Common symptoms include intermittent starting, dashboard failures, and random machine shutdowns. D-codes indicate electrical or control circuit faults, while DW/DX codes signal solenoid and Electronic Pressure Control (EPC) valve failures. Inspecting hydraulic oil condition is critical, as overheated or contaminated fluid can trigger solenoid circuit errors. Low or unstable battery voltage causes cascading ECM and sensor supply faults. Specific fault codes may indicate short circuits in travel speed solenoids or open/short circuits in blade angle EPC valves. Grounding issues between the engine and chassis are a frequent cause of no-crank conditions.

What are the recommended fluid specifications for the Komatsu NH-220-CI-2F engine and hydraulic system?

Komatsu Genuine Lubricants are formulated to exceed industry standards. For the engine, use Komatsu diesel engine oil meeting Komatsu Engineering Standards. For the hydraulic system, use Komatsu hydraulic oil (HO) meeting ISO VG46 or DIN 51524 Part 2, class HLP specifications. For the final drive and swing gear cases, use Komatsu powertrain oil (TO) meeting API CD specifications. For axle differentials, use Komatsu axle oil (AXO) meeting SAE 80WZF and API GL-4 standards. The cooling system requires Komatsu Super Coolant AF-NAC, which meets JIS K 2234-1987 and ASTM 3306 standards. Always verify fluid levels when cold and check for contamination in the hydraulic oil cooler.

What are the common engine quirks and maintenance requirements for the Cummins NH-220 in this application?

The NH-220 engine in the NH-220-CI-2F requires careful attention to the fuel system's float tank and filter canister. If the canister is not kept full, air enters the system, causing hard starting, misfiring on cylinders #1 and #6, and potential damage. The accessory drive belt on the left side of the front cover drives both the alternator and water pump; failure of this belt or its tensioner can lead to overheating and electrical loss. The engine is sensitive to air restrictions; loss of power under load often points to clogged air filters, blocked fuel tank vents, or damaged charge-air hoses. Regular inspection of the fuel filter element and water separator is essential to prevent injector wear. The engine's 4½-inch bore and 3 1/0-inch connecting rod require precise clearances during overhaul to maintain compression and prevent oil consumption.

What should be checked when buying a used NH-220-CI-2F (S/N 100101-UP)?

Verify the engine serial number to confirm it is a Cummins NH-220 and not a Komatsu SAA6D102E-22A-8, as service procedures and parts differ. Check the fuel filter canister for proper fill and float operation to ensure no air ingress has occurred. Inspect the left-side accessory drive belt for wear and proper tension. Test all hydraulic functions cold and hot to identify internal leakage that only appears at operating temperature. Check for D-codes and DW/DX fault codes on the display, which indicate electrical or solenoid issues. Inspect the undercarriage for track tension, roller wear, and final drive leaks. Verify the swing brake holds position without drift. Check the cooling package for debris packed between the radiator, hydraulic oil cooler, and charge-air cooler. Ensure the battery and ground connections are clean and tight to prevent starting and sensor faults. Have your dealer verify the exact engine serial number and fluid specifications before purchase.

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

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