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Komatsu JV25CR-7(S/N 7201-UP)

Maintenance schedule, common problems & OEM parts breakdown

The Komatsu JV25CR-7 (S/N 7201-UP) is a compact combination roller in the roughly 2.3-2.4 ton class, built with a front smooth-steel vibratory drum and a rear rubber-tire axle for dual compaction on asphalt lifts. It runs a mechanically injected Komatsu 3D78AE three-cylinder diesel rated 17.2 kW (23.1 hp) at 2600 rpm, 1.204 L displacement, driving the drum and tires through a hydrostatic transmission. Operating weight is 2360 kg (5203 lb), drum width 1201 mm (47.3 in), max travel speed 10.1 km/h (6.3 mph), vibration frequency 55 Hz, and fuel tank capacity 36.3 L (9.6 gal). It belongs to Komatsu's JV25 compact utility-roller family, which was offered in several drum/wheel configurations - drum-only tandem, combination-wheel, double-drum, and this combination-roller layout - built on a shared chassis footprint but with model-specific drivetrain tuning. No confirmed alphanumeric PIN-prefix scheme applies to this line; it uses plain sequential serials starting at 7201.

Across the JV25 family, configuration changes drove real driveline differences rather than a single straight-line succession: the combination-wheel JV25CW-2 sibling, for example, pairs with a different engine (3D84E) than this JV25CR-7's 3D78AE, so engine and injection parts are not interchangeable between configurations even though the chassis looks similar. This generation predates electronic engine controls - there is no ECM and no CID-FMI diagnostic code list, so diagnosis relies on instrument panel warning lamps and mechanical inspection rather than a code reader. In the used and parts market, this matters because buyers need to match parts orders to the exact model suffix and engine stamp, not just the JV25 base name. The line remains in active secondary-market circulation, particularly in Asia and among independent paving contractors, valued for its simple mechanically injected engine, low repair cost, and dual-surface compaction versatility on small asphalt jobs and patch work.

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 JV25CR-7(S/N 7201-UP) specifications

Engine

Engine model	Komatsu 3D78AE (some listings show 3D78AE-3B); 3-cylinder diesel
Gross power	17.2 kW (23.1 hp) @ 2600 rpm
Net power	Not published for this serial range — verify with your dealer
Displacement	1.204 L (73.5 cu in)
Emissions tier	Not documented for this exact serial range — verify with your dealer

Weights

Operating weight	2360 kg (5203 lb)
Centrifugal force (medium amplitude)	24.5 kN (5510 lbf)
Shipping weight	Not separately published; treat as close to operating weight
Ground pressure	Not published for this model

Dimensions

Drum width	1201 mm (47.3 in)
Drum diameter	851 mm (33.5 in)
Height to top of cab/ROPS	approx. 1.71 m (5.62 ft)
Overall length, width, wheelbase, ground clearance	Not reliably documented across available sources for this exact serial range — verify with your dealer or the factory spec sheet

Performance

Maximum travel speed	10.1 km/h (6.3 mph)
Vibration frequency	55 Hz
Gradeability	Not published for this model

Service capacities (summary)

Fuel tank	36.3 L (9.6 gal)
Hydraulic system	Not documented for this exact serial range — verify with your dealer
Engine oil	Not documented for this exact serial range — verify with your dealer
Cooling system	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.

JV25CR-7(S/N 7201-UP) fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (incl. filter) - Komatsu 3D78AE 3-cylinder diesel	Not documented for this exact serial range in available sources - verify with your dealer	Komatsu genuine EO engine oil (API CD/CF class diesel oil); viscosity graded by ambient temperature per the standard Komatsu chart (SAE 10W or 10W-30 in cold climates down to roughly -20C, SAE 30 or 15W-40/20W-50 in warmer ranges above 0C). Confirm exact grade split on the OMM viscosity chart for this serial range.
Cooling system	Not documented for this exact serial range in available sources - verify with your dealer	Komatsu genuine antifreeze/coolant (supercoolant type), mixed to the ratio the OMM specifies for expected ambient temperature; do not mix with non-Komatsu coolant types.
Fuel tank	approx. 36.3 L (9.6 US gal)	No. 2-D diesel fuel; use No. 1-D or a winter-blend diesel in cold weather per the OMM cold-weather fuel note.
Hydrostatic drive / vibratory hydraulic system (single shared reservoir typical of this roller class)	Not documented for this exact serial range in available sources - verify with your dealer	Komatsu genuine HO hydraulic oil, viscosity selected by season/ambient temperature per the OMM hydraulic oil chart (lighter viscosity for cold starts, heavier for high ambient heat).
Grease points (drum bearings, linkage, articulation, vibratory assembly)	Per grease-point interval, not a fill capacity	Komatsu genuine multipurpose grease, NLGI #2 lithium-based EP grease, applied at scheduled grease-fitting intervals.

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

Komatsu JV25CR-7(S/N 7201-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level on the 3D78AE and top up with Komatsu EO as needed Check coolant level in the radiator and reserve tank Drain water and sediment from the fuel/water separator Inspect the drum vibration housing and HST hose fittings for oil leaks Check rear tire inflation pressure and inspect for cuts or uneven wear Grease the drum vibration bearing and articulation/tie-rod points
Every 250 h	Change engine oil and replace the engine oil filter Replace the fuel filter element Check and adjust the fan/alternator belt tension Grease all drum bearing, articulation joint, and steering linkage points Check HST charge pressure and inspect the drive linkage for wear Clean the air cleaner element and replace if clogged
Every 500 h	Replace the hydraulic/HST oil filter element Check the vibration exciter housing oil level and top up with the specified gear oil Check the rear axle differential oil level Inspect the scraper bar and drum shell for wear and adjust clearance Check and re-torque wheel and rear axle mounting hardware
Every 1,000 h	Change the hydraulic/HST system oil Check and adjust engine valve clearance on the 3D78AE Inspect fuel injection nozzles and injection pump spray pattern, send out for service if irregular Replace the air cleaner element Change the rear axle differential oil Inspect radiator hoses and water pump for cracking or seepage
Every 2,000 h	Drain and replace engine coolant, flush the cooling system Change the vibration exciter gear oil Change the rear axle/differential oil Inspect the HST pump and drive motor for internal wear, pressure-test if drive performance has dropped Re-torque drum bearing housing and frame articulation bolts Check the instrument panel warning lamps for correct operation (this generation has no ECM fault codes)
Every 4,000 h	Send the injection pump out for calibration or rebuild Inspect and rebuild the HST pump and drive motor as a matched pair Inspect the vibration exciter bearings and eccentric shaft for play, rebuild the housing if worn Check cylinder compression on the 3D78AE and rebuild the top end if low Inspect the drum shell and articulation frame for fatigue cracking after extended service

Servicing the JV25CR-7(S/N 7201-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

This generation has no ECM or fault-code history, so predictive upkeep on the JV25CR-7 relies on fluid sampling instead of telematics. Pull an engine oil sample from the 3D78AE at every oil change to track wear metals and catch ring or bearing wear before compression drops. Sample HST oil at 500-hour intervals to flag pump or motor wear before drive performance fades. Log any instrument panel warning lamp trip immediately since it is the only real-time fault signal this machine gives.

Corrective & Common Repairs

The front drum's vibration bearing and scraper bar wear fastest from continuous asphalt contact; loose scraper clearance is a common cause of material buildup and drum imbalance. HST drive loss on this model usually traces to a worn charge pump or leaking hose fitting rather than the motor itself. Rear tire cuts and uneven wear stem from incorrect inflation, so check pressure weekly. Water in the fuel is a frequent no-start cause on the mechanically injected 3D78AE; drain the fuel/water separator daily.

Overhaul & Rebuild Points

At major overhaul, focus on the 3D78AE's cylinder liners, injection pump, and valve train - low compression and rough idle are the first signs this 1.204 L three-cylinder needs top-end work. Inspect the vibration exciter housing bearings and eccentric shaft for play; a worn exciter drops the 55 Hz drum frequency and compaction output. Rebuild the HST pump and motor together to preserve drive balance, and check the drum shell and articulation frame for vibration fatigue cracking before returning the roller to service.

Seasonal & Environment Servicing

Cold starts on the mechanically injected 3D78AE benefit from a block heater and winter-grade fuel to prevent gelling in the fuel filter and water separator. In hot, dusty paving environments, service the air cleaner element more often than the standard interval and keep the radiator fins clear of packed debris. Wash asphalt and bitumen off the drum and scraper daily in warm climates so it doesn't harden and unbalance the drum. For seasonal layup, store with a full fuel tank to limit tank condensation.

JV25CR-7(S/N 7201-UP) common service parts

Part number	Part	Notes
YM119833-55620	Fuel Filter Ass'Y	Fuel system service	Check fitment →
YM102103-55520	O-Ring,(For Fuel Filter)	Fuel system service	Check fitment →
266-80-88800	Filter Ass'Y,Bypass	Scheduled service item	Check fitment →
266-80-88830	Element	Scheduled service item	Check fitment →
2691-8-37300	Filter Ass'Y	Scheduled service item	Check fitment →

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JV25CR-7(S/N 7201-UP) fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Charge lamp (battery symbol)	Alternator not charging the battery	Broken or slipping fan belt, failed alternator, loose or corroded wiring connection	Check fan belt tension and condition, inspect alternator output and wiring before continued operation
Engine oil pressure lamp	Engine oil pressure below safe minimum	Low oil level, worn oil pump, clogged oil filter, failed pressure switch	Stop engine immediately, check oil level and pressure switch before restarting
Coolant/water temperature lamp	Engine coolant temperature above normal range	Low coolant level, clogged radiator fins, failed thermostat, slipping fan belt	Stop engine, let it cool, check coolant level and radiator condition
Air cleaner restriction indicator	Intake air filter element is clogged	Dirty or blocked air filter element from dusty jobsite conditions	Clean or replace the air filter element, check for intake leaks
Preheat/glow indicator	Glow-plug preheat cycle in progress for cold starting	Normal cold-start aid function, not a fault by itself	Wait for the lamp to go out before cranking the starter
HST oil temperature lamp	Hydrostatic transmission oil overheating	Low HST oil level, clogged HST oil cooler, prolonged high-load operation	Stop machine, let HST oil cool, check oil level and cooler for debris

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

JV25CR-7(S/N 7201-UP) attachments & work tools

Machine type / work-tool scope

This is a 2.5-ton class combination roller (steel drum plus rubber-tired axle), not an excavator or loader, so it does not carry interchangeable buckets, forks, or quick-coupler-mounted tools. Its only real "work tool" is the vibratory steel drum itself paired with the rubber-tire drive axle.

Drum / tire configuration

Single smooth vibratory steel drum on one axle with a pneumatic rubber-tire axle on the other, giving combined static and vibratory compaction plus tire kneading action in one pass. Drum width for this class runs roughly 1.2 m (47 in), consistent with the JV25 combination-roller line.

Coupler / mounting system

No quick-coupler or third-party tool interface is fitted; the drum and tire axle are integral machine components, not swappable attachments. There is no auxiliary hydraulic circuit provided for aftermarket hammer, sweeper, or grapple tools on this roller class.

Vibration / exciter settings

The drum exciter runs at a fixed high-frequency setting typical of this size class (around 55 Hz per published spec data), with vibration switched on/off from the operator console rather than through selectable amplitude modes. No dual-amplitude or variable-frequency option is documented for this serial range.

Drum wetting / anti-stick kit

Rollers in this class commonly offer a water tank and spray bar over the steel drum to stop asphalt or sticky soil from picking up on the drum face during compaction. This is a normal factory or dealer-fit option for combination rollers of this size, though it is not separately itemized for the 7201-and-up serial range — confirm fitment with your dealer.

Drum scraper bars

Scraper bars riding against the drum face are standard equipment on this class of roller, keeping the drum surface clean rather than functioning as a separate attachment.

Operator protection / canopy

A ROPS canopy or sunshade is offered as a factory or dealer-fit option on Komatsu rollers of this size, mainly for operator weather and rollover protection rather than a work function. Exact availability for this specific serial range should be confirmed with a dealer.

All JV25CR-7(S/N 7201-UP) assemblies by section

Every catalogued assembly group for the Komatsu JV25CR-7(S/N 7201-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

3d78ae-3c Engine S/N 00101-Up

Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Air Cleaner And Mounting

YM***41	Buffle	1
YM***10	Support	1
YM***70	Seat,Rubber	2
YM***61	Support	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Air Intake Manifold And Connection

YM***01	Heater,Intake Air	1
YM***52	Screw	4
YM***00	Clamp	2
YM***11	Gasket (Kit)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Alternator (40a)

YM***50	Brush Ass'Y	1
YM***00	Retainer,Bearing	1
YM***70	Diode Ass'Y	1
YM***20	Nut Assembly., Pulley	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Alternator And Mounting (40a)

YM***30	Plate,Adjust	1
YM***02	Nut	1
YM***50	Bolt	1
YM***52	Screw	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Camshaft And Tappet

Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Crankshaft

YM***00	Gear,Crank	1
YM***80	Parallel Pin	1
YM***50	Pulley,Crank	1
YM***10	Spring Pin	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Cylinder Block

YM***00	O-Ring (Kit)	2
YM***30	Thrust Metal Ass'Y (Std)	2
YM***20	Plug,Drain(Without Oil Cooler Type)	1
YM***00	Gauge,Level	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Cylinder Head

YM***80	Retainer, Spring	6
YM***00	Guide,Valve? Exhaust	6
YM***00	Plug	2
YM***00	Bolt,Head	14

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Cylinder Head Cover

Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Engine Stop Motor

YM***80	Ring,Snap	1
YM***00	Pin,Cotter	1
YM***10	Bracket	1
YM***11	Bracket	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Exhaust Manifold And Muffler(#00112-)

YM***02	Stud	1
YM***80	Collar	2
YM***22	Stud	4
YM***10	Gasket,Exhaust Manifold	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Flywheel And Flywheel Housing(#00112-)

YM***50	Oil Seal Case, Assembly	1
YM***00	Gear,Ring	1
YM***80	Seal? Rear	1
YM***02	Screw	6

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Front Cover And Gear(#00112-)

YM***51	Cap, Lub. Oil Supply	1
YM***52	Bolt	4
YM***40	O-Ring,Drain Plug	1
YM***02	Seal,Ring (Kit)	5

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Filter And Piping

YM***70	Union	1
YM***40	Lever	1
YM***00	Hose	2
YM***00	O-Ring (Kit)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Injection Pump (Governor) (1/2)(#00112-)

YM***02	Lever Ass'Y,Stop	1
YM***10	Pin,Stop Lever	1
YM***00	O-Ring (Kit)	1
YM***40	Lever,Control	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Injection Pump (Governor) (2/2)(#00112-)

YM***01	Weight Assembly., Governor	1
YM***90	Shaft,Governor Lever	1
YM***16	Pin,Spring	1
YM***00	Washer,Spring	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Injection Pump (Pump) (1/2)(#00112-)

YM***50	Kit, Shim	1
YM***10	Plate? Caution	1
YM***50	Cover,Side	1
YM***90	Key,Woodruff	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Injection Pump (Pump) (2/2)(#00112-)

YM***70	Retainer, Spring	3
YM***00	Plunger W/Barrel	3
YM***02	Screw	2
YM***00	Valve,Delivery	3

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Injection Pump And Piping(#00112-)

YM***20	Retainer, Pipe	1
YM***60	O-Ring,Fuel Injection Pump	1
YM***20	Pipe,Injection? No.2	1
YM***10	Pipe,Injection? No.3	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Fuel Nozzle And Spill Pipe

YM***20	Spring	1
YM***00	Fuel Injection Nozzle, Assembly	1
YM***80	Pipe	1
YM***00	Fuel Nozzle Ass'Y	3

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Gasket Kit(#00112-)

YM***60	O-Ring,Fuel Injection Pump	1
YM***40	O-Ring,Drain Plug	1
YM***10	Gasket,Exhaust Manifold	1
YM***50	Gasket,(Square Type)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Lubricating Oil Filter

YM***50	Nut	1
YM***00	Valve,Relief	1
YM***02	Bolt Plated	3
YM***01	Support	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Lubricating Oil Pump And Piping

YM***50	Oil Pressure Transmitter	1
YM***50	Oil Pressure Transmitter	1
YM***02	Seal,Ring (Kit)	2
YM***41	Gasket (Kit)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Oil Pan(#00112-)

YM***52	Screw	22
YM***40	Plug,Drain	1
YM***90	Oil Pan Ass'Y	1
YM***30	Housing Assembly., Gear	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : P.P.C. Pump And Mounting(#00112-)

YM***64	Bearing,Ball	2
YM***50	Bracket	1
YM***02	Stud	4
YM***70	Cover,(For Shipping)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Piston And Connecting Rod

YM***50	Ring Set (+0.25 mm)	1
YM***00	Connecting Rod, Assembly	3
YM***00	Screw	2
YM***00	Pin, Piston	3

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Rocker Arm

YM***50	Rocker Arm Ass'Y	6
YM***02	Screw	6
YM***80	Spring	3
YM***40	Rocker Shaft	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Safety Relay? Diode And Glow Plug Timer

YM***00	Diode	1
YM***00	Relay, Safety	1
YM***20	Timer,Ribbon Heater	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Starting Motor (2kw)

YM***50	Pinion Ass'Y,Pinion	1
YM***20	Housing,Center	1
YM***40	Field Coil Ass'Y	1
YM***70	Brush Holder Ass'Y,Brush	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Starting Motor And Mounting (2kw)

YM***52	Bolt Plated	2
(Y***1)	Starting Motor Ass'Y,(See Fig.A6210-B0a1)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Tool(#00112-)

YM***70	Wrench	1
YM***20	Wrench	1
YM***50	Screw Driver	1
YM***20	Wrench	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : 3d78ae-3c Engine S/N 00101-Up : Water Pump And Cooling Fan(#00112-)

YM***02	Bolt Plated	2
YM***20	O-Ring,(Not Shown)	1
YM***11	Gasket (Kit)	1
YM***90	V-Belt,(Ug? Ud? With Air Conditioner)	1

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Control System

Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Brake Pedal And Linkage

01***16	Bolt (With Air Heater & Conditioner)	2
01***20	Bolt,(With Auto Emergency Steering)	2
01***25	Bolt,Without Revolution Sensor	4
01***30	Bolt,(For Mechanical Governor)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Forward And Reverse Control Lever

01***16	Bolt (With Air Heater & Conditioner)	4
01***20	Bolt,(With Auto Emergency Steering)	11
01***30	Bolt,(Not Used With Emergency Str.)	1
01***30	Bolt,Stopper	4

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Fuel Control Lever

01***16	Bolt - Seat And Tether Belt Mounting	4
01***50	Capscrew	1
01***30	Bolt	1
01***04	Nut,(For Air Conditioner Less)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Steering Cylinder

07***65	O-Ring,Injection Pump Case	1
07***60	O-Ring,(F4350-59a0 -6 )	1
07***26	Nut, Nylon	1
07***25	Bushing	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Steering Cylinder Mounting Parts

01***25	Bolt,(For Canvas Canopy?Head Guard)	2
01***30	Washer, Spring (Supplied W/Spider Assembly), Washer-Spring	2
04***18	Ring, Snap	4
07***75	Fitting,Grease (Without Lub. Piping)	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Steering Piping

01***60	Bolt	2
01***20	Bolt (Itl)	3
01***05	Nut,(For Air Conditioner Less), Nut	2
01***19	Washer,(Not Used With Ventilator)	3

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Steering Valve

25***01	Control Ass'Y	1
25***10	Spring	1
25***00	Plug Ass'Y	1
25***10	Plug	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Control System : Steering Wheel

01***25	Bolt,(For Canvas Canopy?Head Guard)	4
01***35	Bolt,(For Quick Shift) (Mitsubishi)	4
01***11	Nut - Mounting	1
01***30	Washer, Spring (Supplied W/Spider Assembly), Washer-Spring	8

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Engine Related Parts And Electrical System

Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Electrical System (1/3) (Front Line)

01***12	Bolt - Front Cover Mounting	3
01***20	Bolt,(Without Air Con. Or Heater)	4
01***16	Bolt - Seat And Tether Belt Mounting	2
01***20	Bolt, Wiring Harness Mounting Bracket	4

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Electrical System (2/3) (Monitor Panel)

25***00	Switch,Water Splinkler	3
25***12	Panel,Monitor	1
25***60	Switch,Brake	1
25***00	Switch,Water Splinkler	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Electrical System (3/3) (Battery And Rear Line)

01***16	Bolt - Seat And Tether Belt Mounting	1
01***20	Bolt, Wiring Harness Mounting Bracket	4
01***16	Screw, Mount Parking Lights	2
01***04	Nut,(For Air Conditioner Less)	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Engine And Pump Mounting Parts

01***20	Bolt,(For Quick Shift) (Mitsubishi)	11
01***60	Bolt, Mount Tube To Switch Pump	2
01***25	Bolt,(Without Rops Guard? Canopy)	8
01***40	Bolt,(With Service Valve R.H.)	4

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Exhaust Related Parts

01***25	Bolt,Without Revolution Sensor	2
01***65	Bolt,R.H	2
01***06	Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806	6
01***25	Washer,Spring?For Additional Rear Lam	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Fuel Tank(#7201-7220)

01***14	Screw	5
01***13	Washer,Spring(For Wiper Switch Earth)	5
25***23	Cap	1
25***33	Screen Ass'Y	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Fuel Tank(#7221-)

01***14	Screw	5
01***13	Washer,Spring(For Wiper Switch Earth)	5
25***23	Cap	1
25***33	Screen Ass'Y	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Engine Related Parts And Electrical System : Radiator And Mounting Parts

01***12	Bolt,(With Cylinder Cover)	8
01***16	Bolt (With Air Heater & Conditioner)	2
01***06	Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806	8
01***25	Washer,Spring?For Additional Rear Lam	18

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Guard

Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Dashboard And Cover

01***20	Bolt,(Without Air Con. Or Heater)	4
01***16	Bolt - Seat And Tether Belt Mounting	8
01***25	Bolt,(For Canvas Canopy?Head Guard)	4
01***05	Nut,(For Air Conditioner Less), Nut	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Floor Panel

01***20	Bolt, Wiring Harness Mounting Bracket	3
01***05	Nut,(For Air Conditioner Less), Nut	12
01***19	Washer,Spring (With Extinguisher) (D31p)	12
01***25	Washer,Spring?For Additional Rear Lam	3

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Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Frame And Cover

01***16	Bolt - Box Mounting	4
01***12	Bolt - M8 - 1.25 X 12	2
01***16	Bolt - Seat And Tether Belt Mounting	8
01***20	Bolt,(For Mono Lever Steering)	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Operator'S Seat

01***20	Bolt,(With Auto Emergency Steering)	8
01***35	Bolt,(For Quick Shift) (Mitsubishi)	8
01***06	Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806	10
01***08	Nut,(For Canvas Canopy?Head Guard)	5

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Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Steering Yoke

01***20	Bolt,(For Quick Shift) (Mitsubishi)	2
01***25	Bolt,(Without Rops Guard? Canopy)	4
01***40	Bolt,(With Service Valve R.H.)	4
01***30	Washer, Spring (Supplied W/Spider Assembly), Washer-Spring	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Guard : Tank Cover And Engine Hood

01***16	Bolt - Seat And Tether Belt Mounting	2
01***20	Bolt,(For Mono Lever Steering)	4
01***25	Bolt,(For Canvas Canopy?Head Guard)	6
01***30	Bolt,(Not Used When Towing Winch)	2

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Mark Plate And Tool

Komatsu : Jv25cr-7(S/N 7201-Up) : Mark Plate And Tool : Marks And Plates (English)(#7221-)

09***21	Plate? Caution,Fuel Inlet	1
09***10	Plate? Safety,Hydraulic Tank Cap	1
09***01	Plate? Caution,Radiator	1
09***05	Plate? Safety,Antifreezing Solution	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Mark Plate And Tool : Tool

07***00	Pump,Grease	1
07***04	Cartridge,Grease	1
07***00	Nozzle,(For Rubber Shoe)	1
07***17	Nozzle	1

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Track

Komatsu : Jv25cr-7(S/N 7201-Up) : Track : Front Roller

01***30	Bolt,(For Mechanical Governor)	2
01***35	Bolt,(For Position Fixing)	4
01***35	Bolt, Bolt, Mount Tubes To Switch And Work Pumps	16
01***40	Bolt,(With Service Valve R.H.)	16

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Komatsu : Jv25cr-7(S/N 7201-Up) : Track : Front Scraper (1/2) (Front)

01***30	Bolt - M8 X 30lg	2
01***25	Bolt,(For Canvas Canopy?Head Guard)	4
01***35	Bolt,(F4320-52a0 -5 )	7
01***50	Bolt,(For D60pl)	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Track : Front Scraper (2/2) (Rear)

01***30	Bolt - M8 X 30lg	2
01***30	Bolt,(With Body Positioner)	4
01***35	Bolt,(F4320-52a0 -5 )	7
01***50	Bolt,(For D60pl)	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Track : Rear Scraper

01***40	Bolt, Mount Master Brake Cylinder	9
01***50	Bolt,(For Tbg/Abe Spec.)	2
01***40	Bolt	2
01***08	Nut,(For Canvas Canopy?Head Guard)	11

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Komatsu : Jv25cr-7(S/N 7201-Up) : Track : Rear Tire

01***25	Bolt,(Without Rops Guard? Canopy)	4
01***70	Bolt - Accumulator Mounting Bracket	4
01***36	Wahser-Spring, Washer,Spring (Without Towing Winch)	4
06***12	Bearing	4

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Work Equipment Control System

Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (1/6) (Pump)

01***75	Bolt	6
01***25	Bolt	4
07***09	O-Ring,(F4350-61a0 -33 )	1
26***05	O-Ring	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (2/6) (Shaft Ass'Y)

26***00	Shaft Ass'Y	1
26***10	Shaft	1
26***20	Shim	1
26***30	Bearing	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (3/6) (Rotary Ass'Y)

26***00	Rotary Ass'Y	1
26***10	Piston	9
26***20	Block	1
26***30	Retainer	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (4/6) (Hanger Ass'Y)

01***16	Bolt (Op)	4
26***00	Hanger Ass'Y	1
26***10	Hanger	1
26***20	Cover	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (5/6) (Cover Ass'Y)

01***35	Bolt	4
07***18	O-Ring,(See Fig.1601-29?1602-17)	1
07***07	O-Ring - (K10)	2
07***11	O-Ring,(Tm8202-009)	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hst Pump (6/6) (Control Cylinder)

01***32	Bolt	4
01***40	Bolt	1
01***50	Bolt	1
01***55	Bolt	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Htdraulic Tank

01***16	Bolt - Seat And Tether Belt Mounting	10
01***50	Bolt,(Spark Arrester Spec.)	4
01***25	Washer,Spring?For Additional Rear Lam	10
01***30	Washer, Spring (Supplied W/Spider Assembly), Washer-Spring	4

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hudraulic Piping (Oil Cooler Line)

07***20	O-Ring,Relief Valve	2
25***14	Elbow	1
25***23	Elbow	1
25***50	Bushing	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Bypass Valve Line)

01***16	Bolt - Seat And Tether Belt Mounting	2
01***20	Bolt, Wiring Harness Mounting Bracket	2
01***06	Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806	2
01***25	Washer,Spring?For Additional Rear Lam	4

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Hst Pump Line)

25***14	Elbow	3
25***24	Elbow	1
26***45	Hose	1
26***48	Hose	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Neutral Valve Line)

01***25	Bolt,(Rear Attachment Less)	2
01***90	Bolt,With Cover	3
01***06	Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806	5
01***25	Washer,Spring?For Additional Rear Lam	5

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Travel Motor Line)

25***22	Elbow	2
25***14	Elbow	1
25***80	Hose	1
25***21	Support	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Vibration Motor Line)

25***12	Elbow	2
25***23	Elbow	4
25***21	Support	1
25***10	Hose	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Hydraulic Piping (Vibration Valve Line)

01***90	Bolt,With Cover	2
01***25	Washer,Spring?For Additional Rear Lam	2
07***23	Clamp	2
25***14	Elbow	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Oil Spray Piping (1/3) (Suction Line)(#7201-7220)

01***20	Bolt, Wiring Harness Mounting Bracket	2
01***16	Screw,(P.O.C. Model) (Except Japan)	4
01***19	Washer,Spring (With Extinguisher) (D31p)	4
01***25	Washer,Spring?For Additional Rear Lam	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Oil Spray Piping (1/3) (Suction Line)(#7221-)

01***20	Bolt, Wiring Harness Mounting Bracket	2
01***16	Screw,(P.O.C. Model) (Except Japan)	4
01***19	Washer,Spring (With Extinguisher) (D31p)	4
01***25	Washer,Spring?For Additional Rear Lam	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Oil Spray Piping (2/3) (Delivery Line)

07***37	Clamp	2
07***00	Tee	1
07***00	Nipple	2
25***50	Valve,Drain	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Oil Spray Piping (3/3) (Rear Nozzle Line)

01***11	Nut,(With Under Mirror)	4
07***37	Clamp	2
07***36	U-Bolt, Tube Clamp	2
07***00	Nipple	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Travel Motor

25***02	Motor Ass'Y	1
25***10	Plug Ass'Y	1
25***20	Screw	4
25***30	Screw	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Filter

27***20	Plug Kit	1
27***00	Filter Ass'Y,Water	1
27***20	Case	1
27***80	O-Ring	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Piping (1/5) (Suction Line)

01***12	Bolt - M8 - 1.25 X 12	4
01***20	Bolt, Wiring Harness Mounting Bracket	4
01***25	Washer,Spring?For Additional Rear Lam	8
07***59	Clamp	2

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Piping (2/5) (Delivery Line)

01***30	Bolt,(With Body Positioner)	2
01***30	Washer, Spring (Supplied W/Spider Assembly), Washer-Spring	2
07***59	Clamp	2
07***00	Tee	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Piping (3/5) (Front Nozzle Line)

01***11	Nut,(With Under Mirror)	4
07***97	Clamp	2
07***42	Clip,(With Under Mirror)	2
07***00	Tee	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Piping (4/5) (Rear Nozzle Line)

01***11	Nut,(With Under Mirror)	4
07***97	Clamp	2
07***42	Clip,(With Under Mirror)	2
07***00	Tee	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Piping (5/5) (Drain Line)

07***97	Clamp	2
07***00	Nipple	1
26***02	Adapter	1
26***50	Hose	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Pump

07***00	O-Ring,(F4350-65a1 -5 )	1
25***00	Pump Ass'Y,Water	1
25***70	Casing	1
26***30	Seal	1

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Komatsu : Jv25cr-7(S/N 7201-Up) : Work Equipment Control System : Water Tank

01***16	Bolt, Mount Washer Tank To Bracket, Bolt	4
01***20	Bolt,(For Mono Lever Steering)	2
01***20	Bolt	12
01***19	Washer,Spring (With Extinguisher) (D31p)	4

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JV25CR-7(S/N 7201-UP) serial number reference

On JV25CR-7 rollers the machine identification (PIN) plate is mounted on the frame near the operator's platform or on the front articulation/engine hood area, stamped with the full model code and serial number. Komatsu compaction rollers of this era do not use the 3-letter alpha prefix scheme seen on excavators; the number stamped after the model name (here starting at 7201) is simply the sequential production serial for this model/spec break, so read it as-is against the parts/shop manual serial range rather than splitting off a prefix.

Prefix	Identifies	Notes
7201-UP	JV25CR-7 (all configurations)	This is the serial-number break itself, not a 3-character alpha PIN prefix. Komatsu JV25CR-7 vibratory smooth-drum rollers carry a plain sequential serial number under the model designation, the same pattern used across the JV25 roller line, rather than the letter-prefix scheme used on Komatsu excavators, dozers, and loaders. No parts-catalog or dealer source ties a distinct alpha code to this model. Engine fitted across this range is the Yanmar-based Komatsu 3D78AE diesel (naturally aspirated, roughly 17 kW / 23 hp class); confirm the exact engine suffix (running change letter) with your dealer using the machine's own plate, since sources disagree on it.

Frequently asked questions

What engine does the Komatsu JV25CR-7 (S/N 7201-UP) use?

A mechanically injected Komatsu 3D78AE three-cylinder diesel rated 17.2 kW (23.1 hp) at 2600 rpm, 1.204 L displacement. This generation has no ECM or electronic fault codes. Note that the combination-wheel JV25CW-2 sibling uses a different engine (3D84E), so engine parts do not cross over between the two configurations.

What is the operating weight of the JV25CR-7?

2360 kg (5203 lb) in standard combination-roller configuration with front smooth drum and rear tire axle. Exact figure can vary slightly with fluid fill level and any add-on equipment - confirm against the machine's dataplate for parts and transport purposes.

What replaced the Komatsu JV25CR-7?

No confirmed direct successor is documented for this exact combination-roller configuration. It belongs to Komatsu's legacy JV25 compact utility-roller family (drum-only, combination-wheel, double-drum, and combination-roller variants), which remains in active secondary-market circulation - check current availability with your Komatsu dealer for the closest present-day equivalent.

What JV25CR-7(S/N 7201-UP) owners discuss

What do owners say about the hydrostatic drivetrain on the JV25CR-7?

This combination roller drives through a hydrostatic system, piston pump to drum and tire motors. The most common owner complaint is a soft or creeping travel response after the machine sits idle for a while, usually traced to charge pressure dropping off rather than a failing pump - check charge relief setting and the HST filter before condemning the pump. A whining pump under load, or a total loss of drive in one direction, points to worn pump or motor internals. Have your dealer pressure-test the HST circuit before any teardown.

What powers the JV25CR-7, and are there known quirks with that engine?

The JV25CR-7 (S/N 7201-up) runs a naturally aspirated 3-cylinder direct-injection diesel rated around 23 hp (17 kW) at 2600 rpm, built on the same block family used across many compact Komatsu machines. Parts commonality with that wider engine family keeps rebuild parts and mechanic familiarity reasonably good. Reported quirks mirror other small 3-cylinder diesels of this design: hard cold starts if glow plugs or the fuel lift pump are neglected, and injector pop-pressure drift after extended hours that shows up first as light smoke and rough idle, before a noticeable loss of power.

What wear patterns show up on the drum and tires instead of an undercarriage?

Being a front-drum/rear-tire combination roller, there's no track undercarriage to inspect - wear concentrates on the drum shell edges, drum bearings, and the rear tires. Owners commonly flag drum edge thinning or out-of-round drums from curb-riding or over-compaction, and flat-spotted or unevenly worn rear tires when a machine sits parked in one position for long stretches. Scraper bars on both the drum and rear tires wear or knock out of adjustment; letting that go allows material buildup that accelerates wear on both ends.

What electrical or sensor issues come up most on this class of roller?

These machines run a simple 12V system with far fewer sensors than a modern excavator - mainly charging, oil pressure, coolant temperature, and the water-spray circuit. Recurring complaints are a weak or failing alternator/regulator that slowly drains the battery, corroded ground straps at the drum/frame articulation joint from constant flexing, and spray-pump relay or float-switch failures that mimic a clogged nozzle. Because charging and drive-safety circuits are involved, have your dealer verify alternator output and relay function rather than chasing symptoms with jumper wires.

Why do operators report no water reaching the drum, or clogged nozzles?

A clogged water spray system is the single most common complaint on small vibratory rollers, this one included. It almost always traces back to filling the tank with untreated job-site water - sediment and algae plug the inline screen, spray bar, and nozzles. Owners recommend using filtered or clean water only, pulling and cleaning the screen and nozzles on a set interval, and checking the spray pump relay or float switch before assuming the nozzles themselves are bad. A neglected spray system lets asphalt stick to the drum and accelerates drum wear.

Is the vibration system on the JV25CR-7 adjustable, and what do owners say about matching it to the job?

This model is set up as a single-frequency, single-amplitude vibratory system rather than the dual-amplitude setups found on larger rollers, so operators don't have an amplitude switch to fine-tune output - compaction control comes mainly from pass count and travel speed. Owners note that running vibration on hard or already-compacted surfaces accelerates bearing and drum-mount wear for no compaction benefit, so the general guidance is to shut vibration off once the target density is reached rather than running it continuously.

What should a buyer check before purchasing a used JV25CR-7 (S/N 7201-up)?

Confirm the serial number falls in the 7201-up range so parts and manuals match the machine as-built. Start the engine cold and watch for hard starting, smoke, or rough idle that points to injector or glow-plug wear. Cycle the HST through forward, reverse, and full vibration to check for creeping travel, pump whine, or loss of drive in either direction. Inspect the drum shell for out-of-round wear or edge thinning, check rear tires for flat-spotting and even wear, and confirm the water spray system flows cleanly at all nozzles. Check the articulation joint and its ground strap for wear and corrosion, and pull maintenance records to verify oil, filter, and HST fluid change intervals were kept. Have your dealer verify hydraulic and charging system pressures before final purchase.

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

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