Caterpillar RR-250
Caterpillarroad reclaimer

Caterpillar RR-250

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar RR-250 is a self-propelled, rubber-tired road reclaimer and soil stabilizer built to pulverize existing asphalt and base material or blend chemical additives into subgrade through a mid-mounted rotor. Two distinct generations carry the RR-250 name. The base RR-250, built roughly from the mid-1980s into the early 1990s under serial prefix 6ED, runs a mechanically governed Cat 3406 diesel with no digital engine controls and an analog gauge cluster; detailed weight and dimension figures for this early generation are not publicly documented. The later RR-250B, current in Caterpillar literature through the mid-to-late 1990s, runs a Cat 3406C DITA turbocharged, aftercooled diesel rated 250 kW (335 hp) gross and 230 kW (309 hp) net at 2100 rpm, still governed mechanically with no ECM or digital fault codes. Factory weight for the RR-250B is about 18,506 kg (40,799 lb); its badge-twin SS-250B soil stabilizer, sharing the same chassis with a stabilization rotor, weighs about 14,288 kg (31,500 lb). Both machines use a four-wheel rubber-tired chassis with rear engine placement, a front mixing chamber accepting interchangeable rotors, hydrostatic propel drive, and rear-wheel steering, offered as either a road reclaimer (reclamation rotor) or a soil stabilizer (stabilization rotor) on the same platform.

The RR-250B update kept the 3406-family engine but moved to the turbocharged, aftercooled DITA variant for more gross power, and added a load-sensing propel system with a two-speed transaxle, a No SPIN differential, and torsion-flow axle shafts for better traction under milling load - refinements the plain 3406 base RR-250 did not carry. Neither generation received Caterpillar's later electronic engine management; both remain hydra-mechanical machines that rely on gauge readings and physical inspection rather than scan-tool diagnostics. Caterpillar eventually moved this product line away from the RR/SS naming to the RM-series designation, with the RM-250C reclaimer/mixer and later RM300, RM400, and RM500 road reclaimers carrying the concept forward. That makes the RR-250 and RR-250B the oldest reclaimers of this type still active in the used-equipment market. Because the mechanical rotor drive and 3406-family engine remain well supported through Cat's parts network, these units continue to work in municipal and contractor reclamation fleets, with resale value driven mainly by rotor tool wear, chain case condition, and total operating hours rather than electronics.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar RR-250 specifications

Engine

RR-250B series engineCat 3406C DITA (turbocharged, after-cooled), inline-6 diesel
RR-250B gross power250 kW (335 hp) at 2100 rpm
RR-250B net power (Caterpillar rating)230 kW (309 hp) at 2100 rpm
RR-250B net power (other standards)ISO 9249 230 kW (309 hp); EEC 80/1269 230 kW (309 hp); SAE J1349 228 kW (305 hp); DIN 70020 320 PS
RR-250B gross power (other standards)ISO 3046-2 250 kW (335 hp / 340 PS)
RR-250B bore x stroke137 mm x 165 mm (5.4 in x 6.5 in)
RR-250B displacement14.6 L (893 cu in)
RR-250B emissions certification1996 emissions certified; meets emissions standards through 2000
RR-250B altitude deratingNo derating required up to 2286 m (7,500 ft); full rated power maintained by the turbocharger to this elevation
RR-250B starting system24-volt direct electric starting and charging, with ether starting aid
Base RR-250 (earlier, pre-B series) engineCat 3406 diesel, inline-6 (naturally aspirated/turbo variant and exact power/displacement figures not documented in available public sources for this earlier serial range — verify with your dealer)

Weights

RR-250B operating weight18 506 kg (40,799 lb)
RR-250B weight on front wheels12 728 kg (28,059 lb)
RR-250B weight on rear wheels5 779 kg (12,740 lb)
SS-250B configuration weight (same platform, stabilizer nameplate)14 288 kg (31,500 lb) total; 10 787 kg (23,780 lb) front, 3 502 kg (7,720 lb) rear — weight varies by RR vs SS nameplate configuration
Base RR-250 (pre-B) operating weightNot documented in available public sources for this earlier serial range — verify with your dealer
Ground pressureNot published in available sources

Dimensions

Overall length (A)8.78 m (28 ft 10 in)
Width, wheels in (B)2.9 m (9 ft 7 in)
Width, wheels out (C)3.5 m (11 ft 8 in)
Wheelbase (D)4.97 m (16 ft 4 in)
Height (E)3.22 m (10 ft 7 in)
Height with ROPS (F)3.28 m (10 ft 9 in)
Height with optional air conditioner cab3.48 m (11 ft 5 in)
Rotor/cutting width2438 mm (96 in), standard mixing chamber for all rotor styles
Minimum inside turning radius5.5 m (18 ft)

Performance

Propel speed rangeInfinitely variable, single-lever control, top speed 20 km/h (12 mph)
Speed range 1st0–40 mpm (0–132 fpm) creep range
Speed range 2nd0–4 km/h (0–3 mph)
Speed range 3rd0–10 km/h (0–6 mph)
Speed range 4th0–20 km/h (0–12 mph)
Rotor speed, Low/Low124 rpm
Rotor speed, Low/High168 rpm
Rotor speed, High/Low284 rpm
Maximum reclamation depth381 mm (15 in)
Maximum stabilization depth (quick-change rotor)381 mm (15 in)
Maximum deep-mix stabilization depth457 mm (18 in)
GradeabilityNot published in available sources
Drivetrain layoutTwo-speed transaxle plus two-speed hydrostatic propel motor (4 combined ranges); mechanical rotor drive off engine PTO clutch with 3 rotor speeds via drive-axle transmission and chain case

Service capacities (summary)

Fuel tank416 L (110 gal)
Cooling system61 L (16 gal)
Engine crankcase (oil)34 L (9 gal)
Hydraulic system200 L (53 gal)
Propel differential14 L (3.6 gal)
Wheel ends (each)3.31 L (0.88 gal)
Rotor axle22.7 L (6 gal)
Rotor transmission12 L (3 gal)
Propel transmission4 L (1 gal)
Rotor chain case (each)3.8 L (1 gal)
Rotor bearing lube (each)2.4 L (0.6 gal)

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

RR-250 fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (3406 diesel, with filter)Not published in accessible sources for this serial range — Cat 3406-family crankcase refill typically runs in the 30-42 L (8-11 US gal) band depending on pan and filter configuration; confirm exact figure against the OMM Capacities (Refill) table for your machine serial prefix (6ED00001-00113 vs 6ED00216-UP).Cat DEO (Diesel Engine Oil). SAE 15W-40 for temperate/warm climates; SAE 10W-30 for cold-start service below roughly 0°C (32°F). Follow the OMM ambient-temperature viscosity chart for the exact cutoff.
Cooling systemNot published in accessible sources for this serial range — verify against the OMM Capacities (Refill) table; varies by radiator/config between the 6ED00001-00113 and 6ED00216-UP serial breaks.Cat DEAC (Diesel Engine Antifreeze/Coolant), the period-correct full-strength coolant for this generation of 3406-powered machine. Cat ELC (Extended Life Coolant) is the modern drop-in equivalent if converting the system. Maintain a 1:1 water/coolant mix for freeze protection per local climate.
Fuel tankNot published in accessible sources for this exact configuration — figures vary by source and serial range; verify against the OMM or dealer spec sheet.No. 2-D diesel fuel per Cat specification. Use a winterized/No. 1-D blend or treated fuel in cold climates to prevent gelling.
Power train / transmission compartmentNot published in accessible sources for this serial range — confirm against the OMM Capacities (Refill) table.Cat TDTO (Transmission/Drive Train Oil), SAE 30 or multigrade TDTO per ambient temperature chart in the OMM.
Final drives (each side)Not published in accessible sources for this serial range — confirm per-side capacity against the OMM Capacities (Refill) table.Cat TDTO (Transmission/Drive Train Oil), same specification family as the power train compartment unless the OMM calls out a separate final-drive-and-axle oil.
Hydraulic system (tank + circuit)Not published in accessible sources for this serial range — confirm against the OMM Capacities (Refill) table.Cat TDTO or Cat HYDO (Hydraulic Oil) depending on circuit design called out in the OMM; use the viscosity grade matched to the ambient-temperature chart.
Grease (chassis lubrication points)Not applicable — service quantity, not a fill capacity.Cat Multipurpose Grease (Cat MPGM), NLGI Grade 2 for general service. Cat Arctic Platinum or an equivalent low-temperature grease for sustained cold-climate operation.

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

Caterpillar RR-250 maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil and coolant level before starting; check hydraulic oil reservoir sight gauge.
  • Inspect the dry-type air cleaner service indicator and clean or replace the primary element if tripped.
  • Walk-around inspect rear fluid-filled tires for cuts from milled material and confirm inflation pressure.
  • Grease rear-bolster oscillation pin, steering cylinder pins, and rear-door/mixing-chamber pivots.
  • Check rotor chain case oil level and listen for chain slap or abnormal rotor-drive noise.
  • Drain the fuel water separator and check for fuel leaks around the injection pump.
Every 250 h
  • Change engine oil and filter on the Cat 3406/3406C DITA diesel.
  • Replace fuel filters and re-prime the fuel system.
  • Check wheel-end planetary oil level at each wheel and top off as needed.
  • Inspect rotor drive chains for stretch and confirm chain tensioners are within adjustment.
  • Inspect the shear disc, or optional torque limiter, for slip marks or shear-bolt damage.
  • Check air drum brake adjustment and inspect air lines and fittings for chafing.
Every 500 h
  • Change propel differential oil and inspect the No SPIN unit for metal in the drain.
  • Change rotor bearing lube on each side of the mixing chamber.
  • Change hydraulic system filters and pull a hydraulic oil sample for analysis.
  • Inspect steering cylinders, hoses, and the vane-type steering pump for leaks or wear.
  • Inspect cutting tools and drive-in knock-out holders on the installed rotor for wear or breakage.
  • Inspect the color-coded wiring harness and alternator connections for chafing or corrosion.
Every 1,000 h
  • Change oil in each wheel-end planetary final drive.
  • Change rotor axle oil and rotor transmission oil.
  • Change propel transmission oil and inspect the two-speed hydrostatic motor for leaks.
  • Change rotor drive chain case oil on each side and inspect sprockets for wear.
  • Sample engine coolant and check corrosion inhibitor level.
  • Inspect torsion-flow axle shafts and the No SPIN differential for spline wear or noise under load.
Every 2,000 h
  • Change hydraulic system oil and clean or replace the hydraulic tank breather.
  • Change engine coolant and flush the cooling system.
  • Inspect and service the propel system variable-displacement pump and two-speed transaxle.
  • Inspect rotor mandrel and replaceable end rings for wear-limit replacement.
  • Overhaul or reseal steering cylinders if drift or leakage is present.
  • Inspect and, if needed, relined air drum brakes at all wheel ends.
Every 4,000 h
  • Rebuild or replace the rotor drive master clutch and PTO clutch assembly.
  • Overhaul wheel-end planetary final drives, replacing worn bearings and gears.
  • Rebuild the propel differential and torsion-flow axle shafts if wear was noted at prior intervals.
  • Replace rotor mandrel, end rings, and worn tool holders as a set to restore cutting geometry.
  • Evaluate the Cat 3406/3406C DITA top end (injectors, turbocharger, liners) for mid-life rebuild against factory wear limits.

Servicing the RR-250 beyond the schedule

Predictive Maintenance & Fluid Analysis

The RR-250 and RR-250B rely on gauge-cluster monitoring, not ECM fault codes, so trend coolant temperature, hydraulic temperature, and the air-cleaner restriction indicator every shift rather than waiting on a warning lamp. Pull scheduled oil samples from the hydraulic system, rotor axle, rotor transmission, and wheel ends since this platform has no digital service reminders. Watch the No SPIN propel differential and torsion-flow axle shafts for early wear, and track rotor chain stretch inside the sealed chain cases before it shows up as vibration or noise.

Corrective & Common Repairs

Most downtime on this machine traces to the mechanical rotor drive: chain cases, the shear disc or optional torque limiter protecting the drivetrain from tramp material, and worn drive-in knock-out cutting tools on the reclamation or stabilization rotor. Rear tires run calcium-chloride fluid fill and take cuts from milled asphalt, requiring careful refill after any tire repair. Air drum brakes at the wheel ends and the vane-type hydraulic steering pump are common wear items on higher-hour units and worth checking during any rotor-side visit.

Overhaul & Rebuild Points

Major rebuild targets are the wheel-end planetary final drives, the two-speed hydrostatic propel motor and variable-displacement pump, and the rotor mandrel with its replaceable end rings once tools and holders reach wear limits. The PTO-driven mechanical rotor drive - master clutch, rotor transmission, and chain case - carries the highest stress on this machine and deserves inspection whenever the chain cases are opened. Rebuild the No SPIN propel differential if wheel torque transfer becomes uneven under load.

Seasonal & Environment Servicing

Rear tires on the RR-250/RR-250B run calcium-chloride ballast, so cold-weather storage should protect valve stems and rims from freeze and corrosion damage. Reclamation dust loads the dry-type air cleaner quickly, so shorten service-indicator checks in dusty or hot-climate work. On wet or cold stabilization jobs, flush the optional liquid-additive or water-spray system lines to prevent scale buildup and freeze-up, and grease the rear-bolster oscillation pin and steering pivots more often on abrasive, muddy reclamation sites.

RR-250 common service parts

Part numberPart
7R-3004Element As-MeasuringCheck fitment →

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RR-250 fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
Coolant Temperature warning lamp (Level 2/3, red action lamp + horn)Engine coolant temperature has exceeded the safe operating rangeLow coolant level, blocked radiator core (common in reclaiming dust), slipping or failed fan belt, thermostat stuck closedIdle down and shut off engine at a safe point, let it cool, check coolant level and radiator fins before restarting; do not remove a hot pressure cap
Engine Oil Pressure warning lamp (Level 3, action lamp + horn)Engine oil pressure has dropped below the safe thresholdLow oil level, worn oil pump, plugged filter, or a failed pressure sender/sending unitStop the engine immediately, check oil level and filter condition before restarting
Hydraulic Oil Temperature warning lampHydraulic system oil temperature (drum/rotor drive and propel circuits) is running too hotLow hydraulic fluid, clogged oil cooler fins (dust-heavy reclaiming environment), relief valve stuck, or sustained overload of the rotor driveReduce load, idle to allow cooler airflow, then check fluid level and clean cooler core once safe to do so
Charging System / Low Voltage warning lampAlternator output is not maintaining battery chargeLoose or worn alternator belt, failed alternator, or a wiring/ground faultCheck belt tension and battery terminals, then test alternator output
Air Filter Restriction indicatorIntake air filter element is loading up and restricting airflow to the engineHeavy dust ingestion typical of milling/reclaiming work, clogging the primary or secondary elementInspect and service or replace the air filter element per the restriction gauge reading
Fuel Level / Low Fuel warning lampFuel tank level has reached the low-level sender thresholdNormal depletion during operation, or a stuck float/sender giving a false readingRefuel; if lamp stays on after refueling, check the fuel level sender

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

RR-250 attachments & work tools

Reclamation rotors (Breakaway and Cone Tool styles)

Point-attack style rotors carry carbide-tipped tools set in a chevron pattern for maximum breakout force, mounted in drive-in, knock-out tool holders. Rotor diameter is about 1130 mm (45"), maximum working depth 330 mm (13"). Breakaway version uses bolt-on tool holders for weld-free replacement; kicker paddles carry pulverized material over the rotor and replaceable hard-faced end rings protect the mandrel.

Stabilization rotor (Quick Tool Change)

Spade-type carbide-faced tools, each secured by a single nut for fast changeout, for blending additives into cohesive, semi-cohesive or granular material. Standard rotor diameter is about 1220 mm (48") with maximum depth of 381 mm (15"); a deep-mix quick-change version runs about 1372 mm (54") diameter for depths to 457 mm (18").

Combination Reclamation/Stabilization rotor

Dual-purpose rotor mounted in drive-in, knock-out holders that can be switched between point-attack (reclamation) and spade-type (stabilization) tools on the same mandrel, with flighting shaped to protect tool holders from premature wear. Rotor diameter is about 1220 mm (48"), maximum depth 381 mm (15").

Rotor width and mixing-chamber fit

All rotor styles for this class are a common 2438 mm (96") wide and mount to the standard mixing chamber, so rotors are interchangeable on the same machine to switch between full-depth reclamation and soil stabilization work. A breaker bar is included with reclamation rotors to help break up larger material ahead of the drum.

Tool mounting / coupler system

Cutting and stabilization tools use drive-in, knock-out tool holders rather than a quick-hitch style coupler; a tooth puller ships in the machine toolbox for field tool changes. Breakaway-style holders are bolted rather than welded to the rotor body, cutting replacement time versus welded designs.

Rotor drive arrangement

Rotor is turned by a direct mechanical drive off the engine PTO clutch through a rotor transmission and single-strand drive chains on both sides, giving three selectable rotor speeds for varying material and depth. A heavy-duty shear disc is standard protection for the drive train, with an adjustment-free torque limiter offered as an option in its place; the torque limiter slips momentarily under heavy shock loads instead of requiring shear-bolt replacement.

Liquid additive system (option)

Factory-fit kit for injecting emulsion or water additive into the mix, metered at roughly 45-832 L/min (12-220 US gpm) through a spray bar with hydraulic shut-off and microprocessor flow control. Intended for stabilization work where a liquid additive needs precise, even application across the mixing width.

Water spray system (option)

Separate kit using a centrifugal pump to deliver about 190 to 1,135 L/min (50 to 300 US gpm) of water through a spray bar with hydraulically operated shut-off, for dust control or moisture conditioning of processed material.

Rear wheel assist (option)

On-demand hydraulic assist that routes propel-pump flow to high-torque motors at the rear wheels, engaged by an operator switch and freewheeling when off. Reported tractive-effort gains run roughly 22% in first gear up to about 64% in top gear when engaged.

Guarding and certification packages (options)

A field-installable ROPS structure, a sound-suppression package with engine enclosures, and a separate European certification arrangement (adds cab, sound package, mirrors, additional guards, tread changes and a specified seat) are offered for jobsite or regulatory needs.

Cab, lighting and operator-aid options

An enclosed cab with heater, defroster and optional air conditioning, a four-light adjustable working-light package for low-light operation, a mirror package for both sides of the engine compartment, and an FPM (feet/meters-per-minute) speed indicator are available to outfit the base machine.

All RR-250 assemblies by section

Every catalogued assembly group for the Caterpillar RR-250. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Asphalt Spray System
8c9299 Asphalt Ar-Metric
5E***58Frame As1
5E***59Lines As1
5E***61Electrical As1
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8c9298 Asphalt Ar-English
5E***36Lines As1
5E***58Frame As1
5E***62Electrical As1
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5e9261 Electrical As
5e9262 Electrical As
7r3004 Element As
817900 Enclosure As-Meter
5e9258 Frame As
5e9259 Lines As
5e9236 Lines As
9n9531 Meter Gp-Flow
9n9530 Meter Gp-Flow
7x4286 Motor Gp
5e9260 Pump & Meter Gp
7x7439 Pump & Meter Gp
7x4246 Pump As-Hydraulic
7x4246 Pump Gp-Hydraulic
7x4292 Flow Readout As
7x4236 Flow Readout As
9t8248 Rotating Gp
5e9270 Spray Bar As
5e9277 Spray Gp
7x4241 Valve As
9t6859 Valve Gp
9T***59Valve Group-Press & Flow Cmpnstr; (Pressure, Flow Compensator)1
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Basic Engine
7w3798 Camshaft Gp-Single
8n9244 Camshaft Gp-Single
9n0684 Cover Gp-Cylinder Block
9N***84Cover Group-Cylinder Block; Cylinder Block Cover Group1
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4n4792 Cover Gp-Flywheel Housing
4N***92Cover Group-Flywheel Housing; Flywheel Housing Cover Group1
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1w1395 Cover Gp-Front Housing
1W***95Cover Group-Front Housing; Front Structure Cover Gp1
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4n2272 Cover Gp-Valve Mechanism
4N***72Cover Group-Valve Mechanism; Valve Mechanism Cover Group1
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7c0730 Cover Gp-Valve Mechanism
1w6207 Crankshaft As
4n0741 Crankshaft Gp
4N***41Crankshaft Group; Crankshaft Group1
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2w6039 Cylinder Block Gp*R
8n9267 Cylinder Block Gp*R
8N***67Cylinder Block Group; Cylinder Block Group1
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9y3775 Cylinder Head As
7w0009 Cylinder Head As*R-Type 1
7w0009 Cylinder Head As*R-Type 2
7w0007 Cylinder Head As
7w2202 Cylinder Head Gp
7w2203 Cylinder Head Gp
4w2436 Cylinder Head Gp*R
4W***36Cylinder Head Group; Cylinder Head Group1
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1w1439 Cylinder Head Gp*R
1W***39Cylinder Head Group; Cylinder Head Group1
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6n7379 Pulley & Damper Gp
4p5894 Damper & Pulley Gp
8n9653 Drive Gp-Accessory
8N***53Drive Group-Accessory; Drive Gp-Accessory-Air Compressor1
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1n3970 Drive Gp-Accessory
1N***70Drive Group-Accessory; Drive Gp-Accessory-Lh1
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7x8903 Engine Gp
7x8964 Engine Gp
4n6006 Fastener Gp-Front Housing
4N***06Fastener Group-Front Housing; Front Housing Fastener Gp1
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7n3060 Flywheel Gp
6n1299 Flywheel Gp
7c5064 Gear Gp-Front Timing
8n9246 Gear Gp-Front Timing
8N***46Gear Group-Front Timing; Front Timing Gear Group1
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8n5941 Housing Gp-Flywheel
8N***41Housing Group-Flywheel; Flywheel Housing Group1
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8n5965 Housing Gp-Flywheel
1w1468 Housing Gp-Front
1W***68Housing Group-Front; Front Housing Group1
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4n1331 Lifting Eye Gp-Engine
4N***31Lifting Group; Lifting Eye Gp-Engine1
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0774402 Line As-Drive
4n0756 Pan Gp-Engine Oil
7n3516 Rod & Piston Gp
7N***16Piston & Rod Group; Connecting Rod And Piston Group1
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1w9373 Piston Gp
4n1045 Rocker Arm Gp
6n0719 Support Gp-Engine
8n2020 Support Gp-Front
8N***20Support Group-Engine; Engine Support Group-Front1
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777813 Line As-Drive
07***13Universal Joint Group-Pump Drive1
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4n2271 Valve Mechanism Gp
4N***71Valve Mechanism Group; Valve Mechanism Group1
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4w2461 Valve Mechanism Gp
4W***61Valve Mechanism Group; Valve Mechanism Group1
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Brakes
7x2147 Brake Gp
7x9380 Brake Gp-Hydraulic
0776782 Valve As-Power Brake
Console/Panel
8c0123 Cab Ar
7x8888 Console Gp-Part 2 Of 3
7x8888 Console Gp-Part 1 Of 3
7x8888 Console Gp-Part 3 Of 3
0775922 Control As-Electrical
7x9026 Panel As-Instrument
Cooling System
1w8347 Aftercooler Gp-Water
1W***47Aftercooler Group-Water; Water Aftercooler Gp1
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1376336 Aftercooler Gp-Water
4w4251 Conditioner Gp-Coolant
7w2206 Cooler Gp-Engine Oil
4n0729 Cooler Gp-Engine Oil
4N***29Cooler Group-Engine Oil; Engine Oil Cooler Group1
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7c5430 Cover Gp-Water Outlet
3S***43Seal-Lip Type; (Water Temperature Regulator)1
4N***56Gasket-Regulator Cover; (Temperature Regulator Housing)1
5N***15Cover As-Regulating1
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5n8761 Drive Gp-Fan
0L***70Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case6
0S***94Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly2
1D***66Bolt Bracket Assembly To Yoke2
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4n1641 Lines Gp-Water
4N***41Lines Group-Water; Water Lines Group1
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4n2474 Lines Gp-Water-Aftercooler
4N***74Lines Group-Water; Aftercooler Water Lines Group1
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9n3288 Pump Gp-Water
9N***88Pump Group-Water; Water Pump Group1
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7c4957 Pump Gp-Water*R
7w7019 Pump Gp-Water*R
Engine Arrangement
4w3797 Engine Ar-Part 2 Of 2
2W***81Pump Group-Fuel Transfer; Fuel Transfer Pump Group1
2W***33Meter Group-Service; Service Meter Group1
3N***90Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine1
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4w3797 Engine Ar-Part 1 Of 2
1W***57Lines Group-Fuel Injection; Fuel Injection Lines Group1
1W***95Cover Group-Front Housing; Front Structure Cover Gp1
1W***39Cylinder Head Group; Cylinder Head Group1
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7c6843 Engine Ar-Part 2 Of 2*R
2W***81Pump Group-Fuel Transfer; Fuel Transfer Pump Group1
2W***33Meter Group-Service; Service Meter Group1
3N***90Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine1
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7c6843 Engine Ar-Part 1 Of 2*R
1W***95Cover Group-Front Housing; Front Structure Cover Gp1
1W***68Housing Group-Front; Front Housing Group1
1W***76Fastener Group-Fuel Inj Pump; Fuel Injection Pump Fastener Gp1
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9e2022 Engine Ar
1N***70Drive Group-Accessory; Drive Gp-Accessory-Lh1
1W***57Mounting Group-Alternator1
2W***01Filler Group-Oil1
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1383936 Engine Ar-Nonrunnable-Part 2 Of 2
13***61Lines Group-Fuel Injection1
13***36Engine Ar-Nonrunnable1
4N***33Pump Group-Engine Oil1
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1383936 Engine Ar-Nonrunnable-Part 1 Of 2
10***47Alternator Group-Charging; -24-Volt, 50-Ampere1
13***36Aftercooler Group-Water1
13***36Engine Ar-Nonrunnable1
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Frame
5e9574 Ballast Gp
0980556 Roll Bar As
7x8869 Mainframe Gp-Part 5 Of 5
7x8869 Mainframe Gp-Part 2 Of 5
7x8869 Mainframe Gp-Part 4 Of 5
7x8869 Mainframe Gp-Part 1 Of 5
7x8869 Mainframe Gp-Part 3 Of 5
8c0122 Rops Ar-Open
07***71Seat Belt As1
09***56Bar As-Roll; Roll Bar As1
8C***22Rops Ar-Open1
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Fuel System And Governor
8n2177 Control Gp-Governor
8N***77Control Group-Governor; Governor Control Group1
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4w4619 Drive Gp-Governor & Fuel Pump
4W***19Drive Group-Governor & Fuel Pump1
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9y1234 Fastener Gp
9Y***34Fastener Group-Fuel Inj Pump; -Governor1
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1w7376 Fastener Gp-Fuel Injection Pump
1W***76Fastener Group-Fuel Inj Pump; Fuel Injection Pump Fastener Gp1
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4n1981 Filter Gp-Fuel
8h7204 Filter Gp-Fuel
5e9577 Fuel System
6n8878 Gauge Gp-Fuel Pressure
2w7325 Governor Gp-Part 2 Of 4
2w7325 Governor Gp-Part 1 Of 4
2w7325 Governor Gp-Part 3 Of 4
2w7325 Governor Gp-Part 4 Of 4
2w3452 Lines Gp-Fuel Filter
2W***52Lines Group-Fuel Filter; Fuel Filter Lines Group1
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7c3418 Lines Gp-Fuel Injection
7c9936 Lines Gp-Fuel Injection
7c9935 Lines Gp-Fuel Injection
7c3428 Lines Gp-Fuel Injection
7c2108 Lines Gp-Fuel Injection
4w1566 Lines Gp-Fuel Injection
4W***66Lines Group-Fuel Injection; Fuel Injection Lines Group1
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1w0557 Lines Gp-Fuel Injection
1W***57Lines Group-Fuel Injection; Fuel Injection Lines Group1
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7c2107 Lines Gp-Fuel Injection
1367961 Lines Gp-Fuel Injection
7c9937 Lines Gp-Fuel Injection
4w7017 Nozzle As-Fuel Valve*R
4w2549 Pump Gp-Fuel Injection
4n3287 Pump Gp-Fuel Priming
4N***87Pump Group-Fuel Priming; Pump Group-Fuel Priming1
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1w1700 Pump Gp-Fuel Transfer*R
2w4381 Pump Gp-Fuel Transfer
2W***81Pump Group-Fuel Transfer; Fuel Transfer Pump Group1
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2w8541 Governor & Fuel Injection Pump Gp
2W***41Pump Group-Gov & Fuel Inj; Pump Gp-Governor & Fuel Injection1
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2w8628 Torque Control Gp
Gauges And Accessories
8c0126 Indicator As
08***47Indicator As-Electrical0
7R***09Indicator As-Mechanical0
8C***26Indicator As1
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0821247 Indicator As-Electrical
7r2909 Indicator As-Mechanical
2w8133 Meter Gp-Service
2W***33Meter Group-Service; Service Meter Group1
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Hydraulic System
5e9578 Hood & Rotor Lift Gp-Part 2 Of 4
5e9578 Hood & Rotor Lift Gp-Part 4 Of 4
5e9578 Hood & Rotor Lift Gp-Part 1 Of 4
5e9578 Hood & Rotor Lift Gp-Part 3 Of 4
7x9603 Lines Gp-Rear Door Lift-Part 1 Of 2
7x9603 Lines Gp-Rear Door Lift-Part 2 Of 2
0780287 Pump Gp-Hydraulic
0778617 Valve As-Solenoid
Intake And Exhaust System
7x9154 Air Cleaner Gp
0980930 Air Cleaner Gp
9n5263 Cartridge Gp-Turbocharger*R
7c6610 Cartridge Gp-Turbocharger*R
5l7661 Elbow Gp-Exhaust
5L***61Elbow Group-Exhaust; Exhaust Elbow Group1
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8n4398 Lines Gp-Air
8N***98Lines Group-Air; Air Lines Group1
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4n5394 Lines Gp-Turbocharger Oil
4N***94Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group1
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4n0754 Manifold Gp-Exhaust
5l8632 Pipe Gp-Exhaust
9l6671 Shield Gp-Manifold
9L***71Shield Group-Manifold; Manifold Shield Group1
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7c6615 Turbocharger Gp
8n4416 Turbocharger Gp
8N***16Turbocharger Group; Turbocharger Group1
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7c6624 Turbocharger Gp
9n5264 Turbocharger Gp*R
Lubrication System
2n8220 Breather Gp-Crankcase
2N***20Breather Group; Breather Gp-Crankcase1
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4n2481 Fastener Gp-Oil Pump Mounting
4N***81Fastener Group-Oil Pump Mounting; Oil Pump Mounting Fastener Group1
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2w7201 Filler Gp-Oil-L.H.
4n0731 Filter Gp-Oil
4N***31Filter Group-Oil; Filter Gp-Engine Oil1
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4n1288 Fumes Disposal Gp
4N***88Fumes Disposal Group; Fumes Disposal Group1
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4n9951 Gauge Gp-Oil Level-L.H. (Dipstick)
4N***51Gauge Group-Oil Level (Dipstick); Oil Level Gauge Group1
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4n1128 Lines Gp-Engine Oil
4N***28Lines Group-Engine Oil; Oil Lines Group-Engine1
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7x8889 Circulation Gp-Lubrication-Part 1 Of 2
7x8889 Circulation Gp-Lubrication-Part 2 Of 2
4n0733 Pump Gp-Engine Oil*R
0774352 Pump Gp-Hydraulic
Power Train
7x2191 Axle Ar-Steering Drive
7X***15Housing Group-Axle1
7X***16Differential Group1
7X***42Axle Group; Axle Gp-Wheel End1
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7x2142 Axle Gp-Wheel End
7x2190 Axle Gp-Drive
0775973 Clutch Gp
7x2116 Differential Gp
7x2115 Housing Gp-Axle
0780278 Motor Gp-Hydraulic*R
7x9170 Propel Gp-Hydrostatic-Part 3 Of 4
7x9170 Propel Gp-Hydrostatic-Part 4 Of 4
7x9170 Propel Gp-Hydrostatic-Part 1 Of 4
7x9170 Propel Gp-Hydrostatic-Part 2 Of 4
7r4901 Pump Gp-Charge
7x7438 Pump Gp-Hydraulic*R
0780289 Line As-Drive
7x8242 Transmission As-Part 1 Of 2
7x8242 Transmission As-Part 2 Of 2
8c9274 Wheel & Tire As-Front
8c9275 Wheel & Tire As-Rear
Road Reclaimer
Rr-250 Road Reclaimer
Rotor System
0816817 Axle As-Rotor
7x2198 Bar Gp-Breaker
5e9575 Case As-Chain-L.H.-Part 3 Of 5
7x2201 Case As-Chain-L.H.-Part 3 Of 5
7x2201 Case As-Chain-L.H.-Part 2 Of 5
7x2201 Case As-Chain-L.H.-Part 4 Of 5
5e9575 Case As-Chain-L.H.-Part 5 Of 5
5e9575 Case As-Chain-L.H.-Part 1 Of 5
5e9575 Case As-Chain-L.H.-Part 2 Of 5
7x2201 Case As-Chain-L.H.-Part 1 Of 5
7x2201 Case As-Chain-L.H.-Part 5 Of 5
5e9575 Case As-Chain-L.H.-Part 4 Of 5
7x2202 Case As-Chain-R.H.-Part 2 Of 5
5e9576 Case As-Chain-R.H.-Part 4 Of 5
5e9576 Case As-Chain-R.H.-Part 1 Of 5
5e9576 Case As-Chain-R.H.-Part 5 Of 5
5e9576 Case As-Chain-R.H.-Part 3 Of 5
7x2202 Case As-Chain-R.H.-Part 4 Of 5
5e9576 Case As-Chain-R.H.-Part 2 Of 5
7x2202 Case As-Chain-R.H.-Part 1 Of 5
7x2202 Case As-Chain-R.H.-Part 5 Of 5
7x2202 Case As-Chain-R.H.-Part 3 Of 5
7x8778 Control Gp-Depth-Part 2 Of 2
7x8778 Control Gp-Depth-Part 1 Of 2
7x9576 Drive Gp-Rotor-Part 2 Of 2
7x9576 Drive Gp-Rotor-Part 1 Of 2
7x2200 Milling Drum As
7x9589 Hood Gp-Rotor-Part 2 Of 5
7x9589 Hood Gp-Rotor-Part 3 Of 5
7x9589 Hood Gp-Rotor-Part 5 Of 5
7x9589 Hood Gp-Rotor-Part 4 Of 5
7x9589 Hood Gp-Rotor-Part 1 Of 5
0774330 Kit-Electric Shift
8c0008 Rotor Ar-Chopper
8c0009 Rotor As-Part 1 Of 2
8c0010 Rotor As-Tool
8c0009 Rotor As-Part 2 Of 2
0980709 Transmission As
Service Equipment And Supplies
5e9100 Decal As-Part 4 Of 4
5e9100 Decal As-Part 1 0f 4
5e9100 Decal As-Part 2 Of 4
5e9100 Decal As-Part 3 Of 4
Starting And Electrical System
1005047 Alternator Gp-Charging*R
10***45Alternator Group-Charging; (Nippondenso)1
10***46Alternator Group-Charging; -24-Volt, 50-Ampere1
10***47Alternator Group-Charging; -24-Volt, 50-Ampere1
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1005046 Alternator Gp-Charging
10***46Alternator Group-Charging; -24-Volt, 50-Ampere1
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6t7223 Alternator Gp
6T***23Alternator Group-Charging; Alternator Group-Nippondenso -- 24 Volt, 50 Ampere1
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3t1888 Alternator Gp
3T***88Alternator Group-Charging; Alternator Group Delco-Remy 24 Volt, 50 Ampere1
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9g9538 Alternator Gp
1005045 Alternator Gp-Charging
10***45Alternator Group-Charging; (Nippondenso)1
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5s9088 Alternator Gp-Charging*R
3T***88Alternator Group-Charging; Alternator Group Delco-Remy 24 Volt, 50 Ampere1
5S***88Alternator Group-Charging1
6T***23Alternator Group-Charging; Alternator Group-Nippondenso -- 24 Volt, 50 Ampere1
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5e9573 Electrical Gp-Part 1 Of 2
5e9573 Electrical Gp-Part 2 Of 2
8c0120 Light Ar-Working
5n8757 Magnetic Pickup Gp
5N***57Magnetic Pickup Group; Magnetic Pick-Up Group1
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7w1340 Mounting Gp-Alternator
1w6157 Mounting Gp-Alternator
7x8312 Shunt As
2w8198 Shut-Off Gp-Electrical
2W***98Shutoff Group-Electrical; -Fuel1
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2w8198 Shutoff Gp-Electrical
2W***98Shutoff Group-Electrical; -Fuel1
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Steering
8c0128 Bolster Ar-Rear Wheel Steering
8C***28Bolster Rear Axle Wheel Steering1
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8c9281 Bolster As-Rear
775316 Cylinder Gp-Hydraulic (00c-04)
7x8779 Steering Gp-Power-Part 1 Of 2
7x8779 Steering Gp-Power-Part 2 Of 2
0774160 Valve Gp-Steering
Water Spray System
5e9998 Control Gp
7r0004 Lines As
7r0005 Lines As
7r0006 Lines As
7R***06Meter & Lines As-Flow; Lines & Flow Meter As1
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7r0003 Lines & Flow Meter As
7R***03Meter & Lines As-Flow; Lines & Flow Meter As1
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9n9529 Spray Ar-Water
5E***98Control Group1
7R***01Spray Bar & Pump Group1
7R***04Lines As1
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9n9528 Spray Ar-Water
5E***98Control Group1
7R***02Spray Bar & Pump Group1
7R***05Lines As1
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8c9279 Spray Ar-Water
5E***98Control Group1
7R***02Spray Bar & Pump Group1
7R***06Meter & Lines As-Flow; Lines & Flow Meter As1
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8c9280 Spray Ar-Water
5E***98Control Group1
7R***01Spray Bar & Pump Group1
7R***03Meter & Lines As-Flow; Lines & Flow Meter As1
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7r0002 Pump Gp-Bar
7r0001 Pump & Spray Bar As

RR-250 serial number reference

The PIN plate sits on the machine frame near the operator's station or engine compartment, consistent with other Cat construction machines of this era. Read the first three characters as the prefix (identifies the model/build series) and the digits that follow as the sequential unit number within that prefix.

PrefixIdentifies
6EDRR-250 Road Reclaimer, all production, 3406 diesel engine

Frequently asked questions

What engine does the Caterpillar RR-250 use?

It depends on generation. The base RR-250 runs a mechanically governed Cat 3406 diesel with no electronic engine controls. The later RR-250B and its SS-250B soil-stabilizer twin run a Cat 3406C DITA turbocharged, aftercooled diesel rated 250 kW (335 hp) gross and 230 kW (309 hp) net at 2100 rpm. Neither generation carries an ECM; both use hydra-mechanical governing and an analog warning-lamp system.

What is the operating weight of the RR-250?

The RR-250B's factory weight is about 18,506 kg (40,799 lb), with its SS-250B soil-stabilizer badge twin at about 14,288 kg (31,500 lb) on the same chassis. Detailed weight figures for the earlier base RR-250 were not published in surviving factory literature - verify against the machine's own operation and maintenance manual or check with a Cat dealer.

What replaced the Caterpillar RR-250?

Caterpillar moved this product line from the RR/SS naming to the RM-series designation. The RM-250C reclaimer/mixer carried the concept forward, followed by the current RM300, RM400, and RM500 road reclaimers in Caterpillar's paving lineup.

What RR-250 owners discuss

Does the RR-250 always run the same engine, or does that change by series?
No. Owners and mechanics distinguish two distinct machines under this name. The original RR-250 (serial prefix 6ED, early-1990s build) runs the mechanical, direct-injection Cat 3406 with no turbo. The later RR-250B carries the 3406C DITA - turbocharged and aftercooled. Parts, boost-related troubleshooting, and service intervals are not interchangeable between the two. Before ordering engine parts or diagnosing a power complaint, confirm which engine tag is on the machine rather than assuming by model name alone.
What's a known quirk with the rotor drive on this machine?
The rotor is turned by a direct mechanical drive off the engine PTO clutch, running through a rotor transmission and drive chains to give three selectable rotor speeds for different material and depth. A shear disc protects the drivetrain from shock loads by design; on machines fitted with the optional torque limiter instead, momentary slip under a shock load is normal and does not by itself indicate damage. Chain case oil level and chain tension are the first things mechanics check when rotor-drive noise or vibration shows up, before assuming transmission or clutch damage.
What engine quirks show up most often on each series?
On the mechanical 3406 (base RR-250), the recurring complaint is a hard-start or no-start traced to the fuel transfer/hand-priming pump - the plunger-to-housing O-ring dries out and cracks, lets air into the fuel system, and mimics an injector or lift-pump failure. A second common one is the wiring harness at the cylinder head degrading with age, causing a rough idle or dead cylinder that looks like a bad injector but is really a harness/connector fault - check the harness before condemning an injector. On the 3406C DITA (RR-250B), the pattern shifts to turbo and charge-air issues: boost leaks and turbo mounting/alignment drift causing power loss, a wastegate that sticks and reads low boost, and an aftercooler core that plugs with mineral scale from poor coolant quality, restricting charge-air cooling. Have your dealer verify any boost or turbo diagnosis before replacing turbo components, since a misdiagnosed boost leak can mask a worse underlying fault.
What wear pattern is typical for the RR-250's running gear?
This is a rubber-tired, driven-axle machine with a steering system, not a crawler undercarriage, so the wear items to watch are tires and the rotor-drive axle/differential rather than track chain and rollers. Uneven tire wear side-to-side often traces back to an operator favoring one steering direction or repeated side-hill milling passes, so check both sides rather than just the side facing the yard. Hydraulic leaks at articulation and steering-cylinder pins are a common age-related wear item on machines of this vintage and should be checked at every joint, not just the obvious ones.
Are there known electrical or sensor problems specific to the RR-250?
This generation predates the fuller electronic control packages (ECM-driven automatic rotor depth control, network of propel/steer sensors) that later reclaimers carry. Its electrical system is comparatively simple - basic solenoids, the electric-shift rotor drive, and standard gauges - so when something acts up electrically, mechanics check connectors, grounds, and the shift solenoid first rather than assuming a control-module fault. Don't assume documentation or fault-code behavior from newer reclaimer electronics applies to this machine; verify against the correct-generation manual for the serial in front of you.
What should I check when buying a used RR-250?
First, confirm the serial prefix and engine tag to know which machine you actually have - a 6ED-prefix base RR-250 with the mechanical 3406, or an RR-250B with the 3406C DITA - since parts and known issues differ between them. Check rotor chain case oil level on both sides and listen for chain slap or unusual noise when cycling through the rotor speed selections. Check tires for uneven wear pattern side-to-side, and inspect the rotor chamber, cutting bits, and bit holders closely since wear there depends heavily on what material the machine milled, not just hours. On a DITA-engine machine, check coolant condition and aftercooler for scale before assuming charge-air performance is healthy. Ask for service history tied to that specific serial number rather than generic RR-250 history, since two distinct engine families share this model name. Have your dealer verify engine and hydraulic condition on a full inspection before you commit.

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

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